Autopilot Safety

Re “Stewart’s Plane,” letter, Nov. 1: Auto-programmed descents from altitude could create bigger problems within the air traffic control system. The enigma in the Payne Stewart situation remains what incapacitated the crew (loss of cabin pressure/noxious fumes that incapacitated all on board) and prevented them from taking any action. There didn’t appear to be much evidence at the Stewart crash site, but it’s remarkable what the forensic people can determine nowadays.

Loss of cabin pressure (depressurization), although not common, does occur in varying degrees. Not all situations require an emergency descent. If structural integrity is not a factor, switching to a standby pressurization system can correct the problem. If a descent is required, the pilots (as part of their emergency procedure) should coordinate that descent with ATC to avoid the possibility of a collision with other aircraft.

LEW AARONSON

Pilot, Continental Airlines

Culver City