Swissair McDonnell Douglas MD-11 HB-IWF, the aircraft later lost as Flight 111, at Zurich in July 1998

Swissair 111: The Fire Above the Cockpit That Changed Aviation

by Fortuna Leroy | Sep 26, 2026 | Mondo dell'aviazione, Storia e leggende | 0 comments

Fifty-two minutes after leaving New York, the pilots of Swissair Flight 111 noticed an unusual smell in the cockpit. It was the evening of 2 September 1998, the MD-11 was cruising at 33,000 feet over the Atlantic south of Nova Scotia, and nothing else seemed wrong. Within minutes there was visible smoke. Twenty-one minutes after that first smell, at 22:31 local time, the aircraft hit the sea off Peggys Cove at around 300 knots.

All 229 people on board were killed. It took Canadian investigators more than four years, 98% of the wreckage and around two million recovered pieces to explain why. The answer, a fire hidden above the cockpit ceiling, fed by insulation that should never have burned, changed how every airliner is built.

Informazioni rapide

Volo: Swissair 111, New York JFK to Geneva
Data: 2 September 1998
Aeromobili: McDonnell Douglas MD-11, HB-IWF, named "Vaud", about seven years old
Equipaggio: Captain Urs Zimmermann, First Officer Stefan Löw
A bordo: 229: 215 passengers and 14 crew; no survivors
Crash site: Atlantic Ocean off Peggys Cove, Nova Scotia, in about 55 m of water
Causa: In-flight fire above the cockpit ceiling, most likely started by wiring arcing, spread by flammable MPET insulation blankets
Indagine: Transportation Safety Board of Canada, more than four years, CA$57 million

Smoke in the Cockpit

Flight 111 left JFK at 20:18 New York time, bound for Geneva with 215 passengers, among them the AIDS researchers Jonathan Mann and Mary Lou Clements-Mann. Near Yarmouth, Nova Scotia, the crew detected an odour that seemed to come from the air-conditioning system. At 22:14 Atlantic time, with smoke now visible, the captain called Moncton Centre.

“Swissair one-eleven heavy is declaring Pan Pan Pan. We have, uh, smoke in the cockpit.”

Swissair 111 crew — radio call to Moncton Centre, 22:14 ADT, 2 September 1998, as published by CTV News

The crew first asked for Boston. The controller offered Halifax, which was much closer, and they accepted. But the jet was high and heavy with fuel for the Atlantic crossing. At 22:18, handed over to Halifax, it was at 21,000 feet and 30 nautical miles from the airport, too high and too close to land straight in. The crew was vectored over the sea to dump fuel while working through the checklist for smoke of unknown origin.

One step on that checklist was to switch off the "CABIN BUS" power. The crew did not know that the in-flight entertainment system was powered from a different bus, which stayed live. Worse, according to the investigation, shutting off the cabin power changed the airflow in the ventilation ducts in a way that increased the smoke in the cockpit. The fire, meanwhile, was spreading unseen in the space above the ceiling.

Mentour Pilot's full analysis of Swissair 111, from the first smell to the final minutes.

The Last Minutes

The fire began to destroy the aircraft's systems. At 22:24:28 the crew reported that they now had to fly manually, and ten seconds later declared an emergency. It was the last transmission received. At 22:25:41, both flight recorders stopped. For the final six minutes of the flight, there is no voice or data record at all, and investigators had to rebuild what happened from the wreckage.

What they found was harrowing. The heat above the cockpit was intense enough to melt aluminium parts of the ceiling structure. About a minute before impact, the first officer shut down engine number two. At 22:31:18, the MD-11 struck the sea off Peggys Cove at around 300 knots, 20 degrees nose-down and in a steep bank, with forces estimated at 350 g.

CBC's The Fifth Estate on the untold story of Swissair 111 and the investigation that followed.

Two Million Pieces

The recovery, Operation Persistence, went on until December 1999. Divers and dredges brought up about 98% of the aircraft, some 127,000 kg of debris in around two million pieces. Investigators rebuilt the forward fuselage on a frame to trace the fire's path through the wiring and insulation.

Reconstructed wreckage of Swissair Flight 111 — Investigators reconstructed the forward fuselage of Flight 111 to trace the fire through the cockpit ceiling. FAA photo, public domain, via Wikimedia Commons

The Transportation Safety Board of Canada found that the fire most likely started with arcing in wiring connected to the in-flight entertainment network (IFEN) above the cockpit. The system ran on Windows NT and had been fitted to Swissair's MD-11s in 1997 and 1998, with seat-back touchscreens in first and business class. The arc ignited metallised polyethylene terephthalate (MPET) insulation blankets, and the fire spread from there. Circuit breakers of the time were not designed to trip on this kind of arcing.

Swissair MD-11 in-flight entertainment touchscreen — A touchscreen of the in-flight entertainment system fitted to Swissair MD-11s. Swissair disconnected the system in October 1998 and removed it from its MD-11 and 747 fleets. Photo: Swissair / ETH Library, CC BY-SA 4.0, via Wikimedia Commons

“Aircraft certification standards for material flammability were inadequate in that they allowed the use of materials that could be ignited and sustain or propagate fire.”

Transportation Safety Board of Canada — first finding as to causes and contributing factors, final report on Swissair 111 (2003)

Cosa è cambiato?

The TSB listed eleven causes and contributing factors and made recommendations on material flammability testing, wiring and circuit protection, flight recorder power, fire detection and fighting, and checklists. They fed into new FAA standards on aircraft wiring and fire hardening. MPET insulation, approved at the time, became a symbol of how certification had missed the danger of materials that burned once lit.

Swissair renumbered its New York to Geneva flight from SR111 to SR139. Three years later, in the autumn of 2001, the airline itself collapsed. Its successor, Swiss International Air Lines, retired the MD-11 in 2004.

Mayday: Air Disaster reconstructs the last minutes of Swissair 111.

Peggys Cove Remembers

Two memorials now stand near the crash site: one at the Whalesback, near Peggys Cove, and a larger one at Bayswater Beach on the Aspotogan Peninsula, where unidentified remains are buried.

The Swissair 111 memorial at the Whalesback near Peggys Cove — The memorial at the Whalesback near Peggys Cove: "They have been joined to the sea and the sky." Photo: Outriggr / CC BY-SA 2.0, via Wikimedia Commons

For Switzerland, Flight 111 was a national trauma: the pride of its flag carrier, lost with everyone on board. For the rest of the industry, it was a lesson that the most dangerous fire is the one nobody can see.

Sources: Wikipedia (Swissair Flight 111), Transportation Safety Board of Canada final report A98H0003 (as cited), CTV News (ATC transcript), CBC, aeroTELEGRAPH

Domande frequenti

What caused the Swissair 111 crash?

Swissair Flight 111 crashed after an in-flight fire above the cockpit ceiling of the MD-11. The Transportation Safety Board of Canada found it most likely started with arcing in wiring linked to the in-flight entertainment network and spread through flammable MPET insulation blankets.

How many people died on Swissair Flight 111?

All 229 people on board Swissair Flight 111 died: 215 passengers and 14 crew. The MD-11 crashed into the Atlantic off Peggys Cove, Nova Scotia, on 2 September 1998.

Why didn't Swissair 111 land at Halifax?

When the crew declared a Pan Pan at 22:14, the MD-11 was high and heavy with fuel for the Atlantic crossing. At 30 nautical miles from Halifax and 21,000 feet it was too high to land directly, so it was vectored over the sea to dump fuel. The fire destroyed its systems before it could return.

What was the in-flight entertainment problem on Swissair 111?

Swissair had fitted a Windows NT-based in-flight entertainment network to its MD-11s in 1997 and 1998. It was powered by a bus that stayed live when the crew switched off cabin power, and investigators found evidence of arcing in its wiring above the cockpit.

How long did the Swissair 111 investigation take?

The Transportation Safety Board of Canada investigation took more than four years and cost CA$57 million. About 98% of the aircraft, around two million pieces, was recovered from the sea.

Where is the Swissair 111 memorial?

There are two memorials near the crash site in Nova Scotia: one at the Whalesback near Peggys Cove, and a larger one at Bayswater Beach Provincial Park, where unidentified remains are buried.