{"id":28899705,"date":"2026-10-20T16:32:18","date_gmt":"2026-10-20T14:32:18","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/aircraft-weight-and-balance-center-of-gravity-load-sheet-accidents\/"},"modified":"2026-10-20T16:32:51","modified_gmt":"2026-10-20T14:32:51","slug":"aircraft-weight-and-balance-center-of-gravity-load-sheet-accidents","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/aircraft-weight-and-balance-center-of-gravity-load-sheet-accidents\/","title":{"rendered":"Weight and Balance: The Load Sheet That Doomed Air Midwest 5481"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<!-- mfsh:top -->\r\n\r\n<style>\r\n.mfsh-trigger{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 18px;margin:0 0 26px;border:2px solid 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Ten seconds later the flight data recorder caught a pitch attitude of 54 degrees nose up. At 0847:28 the recording ended as the aeroplane struck a US Airways maintenance hangar on airport property. Two crew and nineteen passengers were killed.<\/p>\r\n\r\n<p>The load manifest they had worked from said the aircraft weighed 17,028 pounds with its centre of gravity at 37.8 per cent of the mean aerodynamic chord. Both numbers sat comfortably inside the Beech 1900D envelope. Neither was true. When the National Transportation Safety Board rebuilt the aeroplane from the wreckage and the recorder data, it came out at 17,700 pounds with the centre of gravity at 45.5 per cent MAC &mdash; over the certified weight limit, and five and a half per cent of chord behind the aft boundary the type certificate allows.<\/p>\r\n\r\n<p>Every passenger has watched a ground crew argue about which bags go where and assumed it was a problem of fitting them in. It is not. It is a problem of where the aeroplane balances, and the margin is far narrower than anyone outside the industry imagines.<\/p>\r\n\r\n\r\n<div style=\"background:#f4f6f9;border-left:4px solid #5C91FF;padding:18px 22px;margin:28px 0\"><p style=\"margin:0 0 10px;font-weight:700;color:#0d1117;font-size:17px\">Quick Facts<\/p><p style=\"margin:4px 0\"><strong>What it is:<\/strong> The calculation that fixes an aircraft&rsquo;s gross weight and centre of gravity before every departure, and the limits both must stay inside<\/p><p style=\"margin:4px 0\"><strong>Measured in:<\/strong> Per cent of the mean aerodynamic chord, the reference wing chord used as the balance yardstick<\/p><p style=\"margin:4px 0\"><strong>Forward limit protects:<\/strong> Elevator authority &mdash; the ability to raise the nose at rotation and in the flare<\/p><p style=\"margin:4px 0\"><strong>Aft limit protects:<\/strong> Longitudinal stability, stick force and stall margin<\/p><p style=\"margin:4px 0\"><strong>Air Midwest 5481:<\/strong> 8 January 2003, Beech 1900D, Charlotte. Load sheet said 17,028 lb and 37.8 per cent MAC; the NTSB calculated 17,700 lb and 45.5 per cent MAC. 21 killed<\/p><p style=\"margin:4px 0\"><strong>Fine Air 101:<\/strong> 7 August 1997, DC-8-61, Miami. Stabilizer trim mis-set by at least 1.5 units nose-up. 5 killed<\/p><p style=\"margin:4px 0\"><strong>National Airlines 102:<\/strong> 29 April 2013, Boeing 747-400 freighter, Bagram. Five MRAP vehicles, at least one of which moved aft in flight. 7 killed<\/p><p style=\"margin:4px 0\"><strong>Governing material:<\/strong> 14 CFR 91.9, 121.141, 125.75 and 135.23; FAA Advisory Circular 120-27F<\/p><p style=\"margin:4px 0\"><strong>Empty-weight tolerance:<\/strong> Basic empty weight and CG must be re-established at half of one per cent of maximum landing weight, or half of one per cent of MAC<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The Envelope Is Narrower Than It Looks<\/h2>\r\n\r\n<p>An aeroplane in cruise is a balancing act with three forces in it. The wing makes lift, acting through a point roughly a quarter of the way back along the chord. Gravity pulls down through the centre of gravity. And the tailplane makes a third force &mdash; on most conventional airliners a download, pushing the tail towards the ground &mdash; to hold the whole arrangement in equilibrium. Move the centre of gravity and you change how hard the tail has to work.<\/p>\r\n\r\n<p>The certified envelope is the set of weight and balance combinations where that arrangement still behaves. It has two edges and they protect against entirely different things.<\/p>\r\n\r\n<p>The <strong>forward limit<\/strong> is a control-power limit. The further forward the centre of gravity, the larger the nose-down moment the tail has to overcome, and at some point the elevator simply runs out of travel &mdash; typically at the worst moment, rotating for takeoff or flaring to land at low speed. The <strong>aft limit<\/strong> is a stability limit. As the centre of gravity moves back towards the wing&rsquo;s aerodynamic centre, the aeroplane becomes progressively less willing to return to trimmed flight after a disturbance. Stick forces lighten, the stall margin shrinks, and eventually a pitch-up starts that the elevator cannot arrest. Both limits are hard. Neither announces itself to the crew.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><svg viewBox=\"0 0 860 352\" width=\"100%\" style=\"display:block;background:#ffffff;border:1px solid #e2e7ee;height:auto\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Diagram of longitudinal balance showing wing lift, centre of gravity, tailplane download and what the forward and aft centre of gravity limits each protect against\"><style>.t{font:13px Montserrat,Helvetica,Arial,sans-serif;fill:#454e5e}.h{font:700 15px Montserrat,Helvetica,Arial,sans-serif;fill:#0d1117}.s{font:11px Montserrat,Helvetica,Arial,sans-serif;fill:#8a93a2}.lb{font:600 12px Montserrat,Helvetica,Arial,sans-serif;fill:#0d1117}<\/style><text x=\"28\" y=\"30\" class=\"h\">Three forces, one balance<\/text><path d=\"M70 150 L560 150 L690 162 L690 182 L120 182 L70 170 Z\" fill=\"#f4f6f9\" stroke=\"#cdd6e2\" stroke-width=\"1.5\"\/><polygon points=\"250,150 400,150 420,166 250,166\" fill=\"#dce7fb\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><polygon points=\"640,140 718,134 718,146 640,152\" fill=\"#dce7fb\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><polygon points=\"648,138 672,86 684,86 676,138\" fill=\"#eef2f7\" stroke=\"#cdd6e2\"\/><line x1=\"320\" y1=\"60\" x2=\"320\" y2=\"148\" stroke=\"#2e7d4f\" stroke-width=\"3\"\/><text x=\"330\" y=\"74\" class=\"lb\" fill=\"#2e7d4f\">wing lift, up<\/text><text x=\"330\" y=\"92\" class=\"t\">acts near the quarter-chord point<\/text><circle cx=\"352\" cy=\"166\" r=\"11\" fill=\"#ffffff\" stroke=\"#0d1117\" stroke-width=\"2\"\/><path d=\"M352 155 A11 11 0 0 1 352 177 Z\" fill=\"#0d1117\"\/><path d=\"M352 177 A11 11 0 0 1 352 155 Z\" fill=\"#ffffff\"\/><line x1=\"352\" y1=\"177\" x2=\"352\" y2=\"248\" stroke=\"#0d1117\" stroke-width=\"3\"\/><text x=\"362\" y=\"244\" class=\"lb\">weight, down, through the centre of gravity<\/text><line x1=\"678\" y1=\"152\" x2=\"678\" y2=\"226\" stroke=\"#d8534f\" stroke-width=\"3\"\/><text x=\"690\" y=\"212\" class=\"lb\" fill=\"#d8534f\">tailplane load, usually down<\/text><line x1=\"250\" y1=\"278\" x2=\"470\" y2=\"278\" stroke=\"#cdd6e2\" stroke-width=\"6\"\/><circle cx=\"258\" cy=\"278\" r=\"6\" fill=\"#5C91FF\"\/><circle cx=\"462\" cy=\"278\" r=\"6\" fill=\"#5C91FF\"\/><text x=\"70\" y=\"314\" class=\"t\">Forward limit: at some point the elevator runs out of nose-up authority, usually at rotation or in the flare.<\/text><text x=\"70\" y=\"334\" class=\"t\">Aft limit: the aeroplane stops wanting to return to trimmed flight, and the stall margin shrinks with it.<\/text><text x=\"360\" y=\"268\" class=\"t\" text-anchor=\"middle\">the certified range of centre of gravity positions<\/text><text x=\"700\" y=\"268\" class=\"s\">Schematic. Not to scale.<\/text><\/svg><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Where the three forces act, and what each centre of gravity limit is there to protect. Original diagram, Afterburner.<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Air Midwest 5481: The Paperwork Was Inside the Envelope<\/h2>\r\n\r\n<p>Under the Air Midwest weight and balance program in use that morning, flight 5481 was legal. The program put the aeroplane at 17,028 pounds against a limit of 17,120, and at 37.8 per cent MAC against an aft limit of 40. Nothing on the manifest asked anyone a question.<\/p>\r\n\r\n<p>The Safety Board calculated the real figures three separate ways &mdash; by rebuilding the aircraft from component weights, by re-running the airline&rsquo;s own program, and by analysing the takeoff ground roll from the flight data recorder. The answer was 17,700 pounds, give or take 200, and 45.5 per cent MAC, give or take two. The gap between the paper aeroplane and the real one was most of the difference between flying and not.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><svg viewBox=\"0 0 820 340\" width=\"100%\" style=\"display:block;background:#ffffff;border:1px solid #e2e7ee;height:auto\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Simplified Beech 1900D weight and centre of gravity envelope showing the load sheet figure inside the envelope and the figure the NTSB calculated outside it\"><style>.t{font:12px Montserrat,Helvetica,Arial,sans-serif;fill:#454e5e}.h{font:700 15px Montserrat,Helvetica,Arial,sans-serif;fill:#0d1117}.s{font:11px Montserrat,Helvetica,Arial,sans-serif;fill:#8a93a2}.lb{font:600 12px Montserrat,Helvetica,Arial,sans-serif}<\/style><text x=\"28\" y=\"30\" class=\"h\">Air Midwest 5481: the paper aeroplane and the real one<\/text><rect x=\"140.25\" y=\"112.80000000000001\" width=\"433.6388888888889\" height=\"157.2\" fill=\"#eef4ff\" stroke=\"#5C91FF\" stroke-width=\"2\"\/><text x=\"350.55555555555554\" y=\"168\" class=\"t\" text-anchor=\"middle\">certified envelope (simplified)<\/text><line x1=\"90\" y1=\"270\" x2=\"760\" y2=\"270\" stroke=\"#0d1117\"\/><line x1=\"90\" y1=\"270\" x2=\"90\" y2=\"60\" stroke=\"#0d1117\"\/><line x1=\"108.61111111111111\" y1=\"270\" x2=\"108.61111111111111\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"108.61111111111111\" y=\"290\" class=\"t\" text-anchor=\"middle\">15<\/text><line x1=\"201.66666666666666\" y1=\"270\" x2=\"201.66666666666666\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"201.66666666666666\" y=\"290\" class=\"t\" text-anchor=\"middle\">20<\/text><line x1=\"294.72222222222223\" y1=\"270\" x2=\"294.72222222222223\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"294.72222222222223\" y=\"290\" class=\"t\" text-anchor=\"middle\">25<\/text><line x1=\"387.77777777777777\" y1=\"270\" x2=\"387.77777777777777\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"387.77777777777777\" y=\"290\" class=\"t\" text-anchor=\"middle\">30<\/text><line x1=\"480.83333333333337\" y1=\"270\" x2=\"480.83333333333337\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"480.83333333333337\" y=\"290\" class=\"t\" text-anchor=\"middle\">35<\/text><line x1=\"573.8888888888889\" y1=\"270\" x2=\"573.8888888888889\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"573.8888888888889\" y=\"290\" class=\"t\" text-anchor=\"middle\">40<\/text><line x1=\"666.9444444444445\" y1=\"270\" x2=\"666.9444444444445\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"666.9444444444445\" y=\"290\" class=\"t\" text-anchor=\"middle\">45<\/text><line x1=\"760\" y1=\"270\" x2=\"760\" y2=\"275\" stroke=\"#8a93a2\"\/><text x=\"760\" y=\"290\" class=\"t\" text-anchor=\"middle\">50<\/text><line x1=\"85\" y1=\"240\" x2=\"90\" y2=\"240\" stroke=\"#8a93a2\"\/><text x=\"80\" y=\"244\" class=\"t\" text-anchor=\"end\">15k<\/text><line x1=\"85\" y1=\"180\" x2=\"90\" y2=\"180\" stroke=\"#8a93a2\"\/><text x=\"80\" y=\"184\" class=\"t\" text-anchor=\"end\">16k<\/text><line x1=\"85\" y1=\"120\" x2=\"90\" y2=\"120\" stroke=\"#8a93a2\"\/><text x=\"80\" y=\"124\" class=\"t\" text-anchor=\"end\">17k<\/text><line x1=\"85\" y1=\"60\" x2=\"90\" y2=\"60\" stroke=\"#8a93a2\"\/><text x=\"80\" y=\"64\" class=\"t\" text-anchor=\"end\">18k<\/text><text x=\"425\" y=\"310\" class=\"t\" text-anchor=\"middle\">centre of gravity, per cent of mean aerodynamic chord<\/text><text x=\"34\" y=\"165\" class=\"t\" transform=\"rotate(-90 34 165)\" text-anchor=\"middle\">gross weight, pounds<\/text><line x1=\"573.8888888888889\" y1=\"270\" x2=\"573.8888888888889\" y2=\"60\" stroke=\"#d8534f\" stroke-width=\"1.5\" stroke-dasharray=\"6 4\"\/><text x=\"579.8888888888889\" y=\"76\" class=\"lb\" fill=\"#d8534f\">aft limit 40%<\/text><line x1=\"90\" y1=\"112.80000000000001\" x2=\"760\" y2=\"112.80000000000001\" stroke=\"#d8534f\" stroke-width=\"1.5\" stroke-dasharray=\"6 4\"\/><text x=\"756\" y=\"104.80000000000001\" class=\"lb\" fill=\"#d8534f\" text-anchor=\"end\">max takeoff weight 17,120 lb<\/text><circle cx=\"532.9444444444443\" cy=\"118.32\" r=\"7\" fill=\"#2e7d4f\"\/><text x=\"520.9444444444443\" y=\"123.32\" class=\"lb\" fill=\"#2e7d4f\" text-anchor=\"end\">load sheet: 17,028 lb, 37.8%<\/text><circle cx=\"676.25\" cy=\"78\" r=\"7\" fill=\"#d8534f\"\/><text x=\"688.25\" y=\"72\" class=\"lb\" fill=\"#d8534f\">NTSB: 17,700 lb, 45.5%<\/text><text x=\"28\" y=\"320\" class=\"s\">Envelope drawn as a rectangle for clarity; the real boundary narrows with weight. Figures from NTSB AAR-04\/01.<\/text><\/svg><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The load sheet put flight 5481 inside the envelope. The aeroplane the NTSB reconstructed was outside it on both axes. Original diagram, Afterburner, from the figures in NTSB AAR-04\/01.<\/figcaption><\/figure>\r\n\r\n\r\n<p>What that did to the controls is the detail worth keeping. The investigation also found the elevator control system had been rigged incorrectly during maintenance at Huntington, West Virginia, which left the available travel running from about 20 degrees nose-up to only about 7 degrees nose-down. At the weight and balance the aeroplane was actually at, between 9 and 10 degrees of nose-down elevator were needed to establish a controlled climb. The crew did not run out of skill. They ran out of elevator, by about three degrees, in an aeroplane that should have had twenty.<\/p>\r\n\r\n<p>Two independent failures, neither individually fatal, lined up. That is the whole of it, and it is why the Board&rsquo;s probable cause names both.<\/p>\r\n\r\n<p>The Board was unambiguous about how the two faults combined, and about who else was in the chain.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><em>&ldquo;The loss of pitch control resulted from the incorrect rigging of the elevator control system compounded by the airplane&rsquo;s aft center of gravity, which was substantially aft of the certified aft limit.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>National Transportation Safety Board<\/strong> &mdash; Probable cause, AAR-04\/01, Air Midwest flight 5481<\/div><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The Numbers Everyone Assumed<\/h2>\r\n\r\n<p>Buried in the list of contributing factors is an item that reads oddly until you understand how airlines weigh people: <em>the Federal Aviation Administration&rsquo;s average weight assumptions in its weight and balance program guidance at the time of the accident<\/em>. Nobody weighs passengers. An operator of multiengine turbine aircraft with five or more seats can apply for authority to use standard average weights instead, and then the load sheet is arithmetic performed on assumptions.<\/p>\r\n\r\n<p>Which makes the assumptions load-bearing. The current guidance, Advisory Circular 120-27F, handles this in a way that surprises people who go looking for the number: it does not publish one. The example table in the AC is printed with the weight columns blank. Operators derive their own standard averages from Centers for Disease Control and National Health and Nutrition Examination Survey data, add a clothing allowance of five pounds in summer and ten in winter, and submit the result to the FAA for approval into their operations specifications. Summer weights may be used from 1 May to 31 October, winter weights from 1 November to 30 April, and an operator with seasonal variation that wants a single year-round figure is told to use the winter one.<\/p>\r\n\r\n<p>The same AC sets the housekeeping that keeps the empty aeroplane honest. Basic empty weight and centre of gravity have to be re-established whenever cumulative logged changes exceed half of one per cent of maximum landing weight, or whenever the centre of gravity has drifted by half of one per cent of the mean aerodynamic chord. Half a per cent. That is the tolerance on an empty aeroplane before anyone has loaded a single bag.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/1jCSLbMOufs\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>Charlotte is the case study, but it is not the only shape this failure takes. Two other investigations show the other two ways the sum can come out wrong: when the form itself is built incorrectly, and when the load refuses to stay where it was put.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Fine Air 101: When the Form Itself Is Wrong<\/h2>\r\n\r\n<p>Six years before Charlotte, a Douglas DC-8-61 freighter lifted off runway 27R at Miami and pitched up far beyond anything the crew wanted. Fine Air flight 101 crashed shortly after takeoff on 7 August 1997, killing its three flight crew and a security guard on board, and a motorist on the ground.<\/p>\r\n\r\n<p>The Safety Board found the cargo had not been loaded the way the load plan specified, which is the headline. The more unsettling finding is what it discovered about the paperwork itself. Fine Air&rsquo;s printed load sheet form said DC-8-61 at the top, but the fuel distribution scale on it had been built from DC-8-62 and -63 data. The same form listed the maximum allowable weight for pallet position 18 as 6,088 pounds when the correct figure was 3,780 &mdash; so that position went out 1,247 pounds over its limit on the accident flight, with nothing on the form to say so.<\/p>\r\n\r\n<p>The stabilizer was set to 2.4 units nose-up. The Board calculated that the correct setting for the weight involved was 0.9, which makes the trim wrong by at least 1.5 units in the nose-up direction before the aeroplane ever moved. On a DC-8 at rotation, that is a pitch-up the crew has seconds to catch. The report is honest about the limit of what could be established: the actual centre of gravity could not be determined, so the severity of the control problem could not be either.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><em>&ldquo;The accident... resulted from the airplane being misloaded to produce a more aft center of gravity and a correspondingly incorrect stabilizer trim setting that precipitated an extreme pitch-up at rotation.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>National Transportation Safety Board<\/strong> &mdash; Probable cause, AAR-98\/02, Fine Airlines flight 101<\/div><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">National Airlines 102: When the Load Moves in Flight<\/h2>\r\n\r\n<p>The third case is the one that haunts loadmasters, because the aeroplane was loaded, the paperwork was done, and the centre of gravity moved anyway.<\/p>\r\n\r\n<p>On 29 April 2013 a Boeing 747-400 freighter took off from Bagram with five mine-resistant ambush-protected vehicles on the main deck &mdash; two 12-ton M-ATVs and three 18-ton Cougars. It was the first time National Airlines had attempted to carry five of them. They were too large for standard unit load devices, so they rode on centreline-loaded floating pallets, held by tie-down straps. The aeroplane climbed steeply after rotation and then descended in a manner the Safety Board described as consistent with an aerodynamic stall. All seven people on board were killed.<\/p>\r\n\r\n<p>The investigation found strong evidence that at least one vehicle, the rear M-ATV, broke loose and travelled aft into the tail. It damaged hydraulic systems one and two, and it damaged components of the horizontal stabilizer drive mechanism &mdash; the same jackscrew assembly that, on a different Boeing, is <a href=\"https:\/\/migflug.com\/afterburner\/faa-ad-boeing-737ng-horizontal-stabilizer-freeplay-flutter-2026\/\">the subject of an airworthiness directive published this week<\/a>. After that there was no pitch control left to recover with. A shifting load is not a weight and balance error in the usual sense. It is a restraint failure that becomes one, in flight, at the worst possible moment.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7\"><em>&ldquo;National Airlines&rsquo; inadequate procedures for restraining special cargo loads... resulted in the loadmaster&rsquo;s improper restraint of the cargo, which moved aft and damaged hydraulic systems Nos. 1 and 2 and horizontal stabilizer drive mechanism components, rendering the airplane uncontrollable.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>National Transportation Safety Board<\/strong> &mdash; Probable cause, AAR-15\/01, National Airlines flight 102<\/div><\/div>\r\n\r\n\r\n<p>The cockpit voice recording and the flight data from Bagram have been reconstructed in detail, and the sequence is short enough to watch in full.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/hvZEr3IkLJI\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">What Actually Protects You<\/h2>\r\n\r\n<p>Read the three reports together and a pattern comes out that is not about arithmetic at all. In every case the number on the paper was reasonable. In Charlotte the program said the aeroplane was legal. In Miami the form was internally consistent and wrong. At Bagram the load plan was followed and the restraint was not up to the job. The failure was never that someone could not add up.<\/p>\r\n\r\n<p>What protects a flight is the chain that keeps the paper and the aeroplane in agreement: a weight and balance program that reflects the operation it is actually used in, average weights that match the people actually boarding, empty weights re-established before they drift half a per cent, cargo restrained to a standard that was designed for the load being carried, and an operator exercising real control over the loading rather than delegating it to a handling agent and hoping. Three of those four appear by name in the contributing factors of the three accidents above.<\/p>\r\n\r\n<p>The centre of gravity is not a number on a form. It is a physical place inside the aeroplane, and it moves every time something is put in or taken out. The form is only ever a claim about where it is. Thirty-three people died in these three accidents because, on those three days, the claim was wrong.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/0DvAzCGrc1A\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p><em>Sources: NTSB Aircraft Accident Report AAR-04\/01, Loss of Pitch Control During Takeoff, Air Midwest Flight 5481; NTSB AAR-98\/02, Fine Airlines Flight 101; NTSB AAR-15\/01, National Airlines Flight 102; FAA Advisory Circular 120-27F, Aircraft Weight and Balance Control.<\/em><\/p>\r\n\r\n<!-- mfsh:bottom -->\r\n\r\n<button type=\"button\" class=\"mfsh-trigger mfsh-bottom\" data-mfsh-placement=\"bottom\" aria-haspopup=\"dialog\"><svg><use href=\"#mfsh-i-share\"\/><\/svg>Share this story<\/button>\r\n\r\n<!-- \/mfsh:bottom -->\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What is aircraft weight and balance?<\/summary><div class=\"a\">Aircraft weight and balance is the calculation that establishes an aeroplane\u2019s gross weight and the position of its centre of gravity before every departure, and confirms that both sit inside the limits on the type certificate. It is required by 14 CFR 91.9, 121.141, 125.75 and 135.23, and the FAA\u2019s guidance for operators is Advisory Circular 120-27F.<\/div><\/details><details><summary>What are the centre of gravity limits on an airliner?<\/summary><div class=\"a\">Every aircraft type has a forward and an aft centre of gravity limit, normally expressed as a percentage of the mean aerodynamic chord and varying with gross weight. The Beech 1900D flown by Air Midwest flight 5481, for example, has a certified aft limit of 40 per cent MAC. The permitted range on an airliner is typically only a small fraction of the wing chord.<\/div><\/details><details><summary>What happens if a plane is loaded out of balance?<\/summary><div class=\"a\">Too far forward and the elevator eventually cannot raise the nose, which matters most at rotation and in the flare. Too far aft and the aeroplane becomes unstable in pitch: stick forces lighten, the stall margin shrinks, and a pitch-up can develop that the elevator cannot arrest. The NTSB has traced fatal accidents to both conditions.<\/div><\/details><details><summary>Why is aircraft weight and balance important?<\/summary><div class=\"a\">Because the margins are small and the error is invisible from the cockpit. On Air Midwest flight 5481 the load manifest showed 17,028 pounds at 37.8 per cent MAC, comfortably legal, while the NTSB calculated the real figures as 17,700 pounds at 45.5 per cent MAC. Nothing the crew could see distinguished the two.<\/div><\/details><details><summary>Do airlines weigh passengers before a flight?<\/summary><div class=\"a\">Normally no. Operators of multiengine turbine aircraft with five or more passenger seats can be authorised to use standard average weights instead of actual ones. Under Advisory Circular 120-27F the operator derives those averages from Centers for Disease Control survey data, adds a clothing allowance of five pounds in summer or ten in winter, and has the result approved into its operations specifications.<\/div><\/details><details><summary>What caused the Air Midwest flight 5481 crash?<\/summary><div class=\"a\">The NTSB found the loss of pitch control resulted from incorrect rigging of the elevator control system compounded by a centre of gravity substantially aft of the certified aft limit. The rigging error left only about 7 degrees of nose-down elevator travel available when 9 to 10 degrees were needed to establish a controlled climb at the aeroplane\u2019s actual weight and balance.<\/div><\/details><details><summary>What is mean aerodynamic chord, and why is the centre of gravity given as a percentage of it?<\/summary><div class=\"a\">The mean aerodynamic chord is a single reference chord length that represents the whole wing. Expressing the centre of gravity as a percentage of it makes the figure comparable across aircraft and directly meaningful aerodynamically, because the wing\u2019s own centre of lift also sits at a fixed percentage of chord. Saying 45.5 per cent MAC says exactly how close the balance point is to the lift point.<\/div><\/details><details><summary>Can an aircraft\u2019s centre of gravity move in flight?<\/summary><div class=\"a\">Yes. Fuel burn moves it, passengers moving about move it slightly, and cargo that is not properly restrained can move it catastrophically. On National Airlines flight 102 the NTSB found strong evidence that at least one 12-ton vehicle broke loose and travelled aft into the tail, damaging hydraulic systems and the horizontal stabilizer drive mechanism and leaving the crew with no pitch control.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is aircraft weight and balance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Aircraft weight and balance is the calculation that establishes an aeroplane\u2019s gross weight and the position of its centre of gravity before every departure, and confirms that both sit inside the limits on the type certificate. It is required by 14 CFR 91.9, 121.141, 125.75 and 135.23, and the FAA\u2019s guidance for operators is Advisory Circular 120-27F.\"}},{\"@type\":\"Question\",\"name\":\"What are the centre of gravity limits on an airliner?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Every aircraft type has a forward and an aft centre of gravity limit, normally expressed as a percentage of the mean aerodynamic chord and varying with gross weight. The Beech 1900D flown by Air Midwest flight 5481, for example, has a certified aft limit of 40 per cent MAC. The permitted range on an airliner is typically only a small fraction of the wing chord.\"}},{\"@type\":\"Question\",\"name\":\"What happens if a plane is loaded out of balance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Too far forward and the elevator eventually cannot raise the nose, which matters most at rotation and in the flare. 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Under Advisory Circular 120-27F the operator derives those averages from Centers for Disease Control survey data, adds a clothing allowance of five pounds in summer or ten in winter, and has the result approved into its operations specifications.\"}},{\"@type\":\"Question\",\"name\":\"What caused the Air Midwest flight 5481 crash?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The NTSB found the loss of pitch control resulted from incorrect rigging of the elevator control system compounded by a centre of gravity substantially aft of the certified aft limit. The rigging error left only about 7 degrees of nose-down elevator travel available when 9 to 10 degrees were needed to establish a controlled climb at the aeroplane\u2019s actual weight and balance.\"}},{\"@type\":\"Question\",\"name\":\"What is mean aerodynamic chord, and why is the centre of gravity given as a percentage of it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The mean aerodynamic chord is a single reference chord length that represents the whole wing. Expressing the centre of gravity as a percentage of it makes the figure comparable across aircraft and directly meaningful aerodynamically, because the wing\u2019s own centre of lift also sits at a fixed percentage of chord. Saying 45.5 per cent MAC says exactly how close the balance point is to the lift point.\"}},{\"@type\":\"Question\",\"name\":\"Can an aircraft\u2019s centre of gravity move in flight?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Fuel burn moves it, passengers moving about move it slightly, and cargo that is not properly restrained can move it catastrophically. On National Airlines flight 102 the NTSB found strong evidence that at least one 12-ton vehicle broke loose and travelled aft into the tail, damaging hydraulic systems and the horizontal stabilizer drive mechanism and leaving the crew with no pitch control.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/checked-baggage-rules-faa-iata-what-goes-in-the-hold\/\">What actually goes in the hold, and what the rules say<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/airline-fuel-reserves-faa-easa-contingency-final-reserve\/\">Airline fuel reserves: what the FAA and EASA actually demand<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/rejected-take-off-v1-decision-speed-explained\/\">Rejected takeoff and the V1 decision speed, explained<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Share this story At three seconds past 0847 on 8 January 2003, the captain of Air Midwest flight 5481 said two words into the cockpit voice recorder: &ldquo;help me.&rdquo; The Beech 1900D had just left runway 18R at Charlotte and the nose would not come down. Ten seconds later the flight data recorder caught a [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":28899670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-28899705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aircraft Weight and Balance: CG Limits Explained | MiGFlug<\/title>\n<meta name=\"description\" content=\"Aircraft weight and balance decides where the centre of gravity sits. 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