During a seemingly routine flight, Captain Zimmerman smells smoke. He decides to try and find out where the source of fire is located before total failure.

What happened to make pilots leave the cockpit?

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Mayday: Air Disaster - From Season 1 Episode 3 "Fire On Board": Everything is normal as Flight 111 leaves New York City for Geneva. The captain is Urs Zimmerman, one of Swissair’s most experienced pilots and a trainer for the safety conscious airline. But 56 minutes into the flight, Captain Zimmerman smells smoke. He contacts Air Traffic Control to declare an emergency. He is told to land immediately at the closest airport – Halifax. Captain Zimmerman is busy going through the Swissair checklist, shutting off electrical circuits one by one to isolate the problem. He knows he must get down on the ground as quickly as possible but the plane is 30 tons too heavy to land. It’s a race against time to dump fuel and land.

Fire can go from a nuisance to a catastrophe in no time. On board Flight 111, there is suddenly a major failure of all electrical systems. Co-pilot Stefan Loew tells Air Traffic Control that he’s lost all his main instruments. He declares an emergency. This is the last transmission from the plane. Radar records show the plane flying on for six more minutes before crashing into the Atlantic, killing all on board.

Fire on Board asks why the fire spread so destructively, so quickly. When the pilots switched off all non-essential electrical systems, they thought that they had switched off the in-flight entertainment system. It turns out that the way it was wired meant they could not de-activate that circuit.

When a cockpit fills with smoke, pilots are forced to leave their seats. Investigators believe that there was no one at the controls of Flight 111 when it crashed. Passengers and crew knew they were doomed.

The Canadian Coast Guard picks up bodies and wreckage on the surface of the water. The black box and the cockpit voice recorder both stopped at the same time as the last transmission. Experts study the remains of the cockpit to discover the source of fire. The investigation finds the in-flight entertainment system provided the spark and the insulation that covers the entire inside of the aircraft provided the tinder.

The discoveries are not new. These fire hazards were known. It’s the snail’s pace of regulatory change that killed people.

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