Aviation Investigation Report A98H0003

1.16.5  Simulator Trials (STI1-100)

Several MD-11 simulator sessions were conducted in support of the accident investigation. The sessions primarily assessed MD-11 descent performance, and the potential effects of various system failures. Because of the lack of specific information about the initial cues available to the pilots, the loss of aircraft systems, and the degradation of the cockpit environment in the last five minutes of the flight, no attempt was made to replicate the actual flight.

For some of the testing that was completed to assess systems failures, the simulator was set to the atmospheric conditions, aircraft performance, and aircraft configurations similar to those experienced by SR 111 at the various times during the last 30 minutes of the flight. Various failures of aircraft systems that were recorded on the FDR during the 92-second period immediately prior to recorder stoppage were introduced. Observations were made on the panels, pedestal, and DUs in the cockpit when these failures were introduced. Also, the SMOKE ELEC/AIR selector was rotated to various positions after the failures were introduced. Another test during this session was designed to assess handling qualities of the MD-11 in flight with LSAS failure and a complete electrical failure. It was determined that the simulator was still flyable in each of the following situations:

  • With only one channel of the LSAS;
  • With no LSAS; and
  • With no electrical power available.

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