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Swissair 111

Printed page vi. PDF page 6.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 1.12.6 Examination of Standby Instruments . . . .
Open final report at PDF page 6TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 33. PDF page 45.

FACTUAL INFORMATION Primary power for the two standby instruments' integral lights (STI1-8) was being supplied by the 115 V AC Bus 1 (phase B) circuit breaker (CB) B-523 (labelled MAIN & PED INSTR PNL LTG) located on the lower main
Open final report at PDF page 45TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 64. PDF page 76.

the cockpit and failed aircraft systems and displays, and at some point was flying on standby instruments. Therefore, it is likely that the aircraft would not have been at the ideal position and speed for landing over the threshold, which
Open final report at PDF page 76TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 96. PDF page 108.

flammable59 and easily ignitable from a small ignition source. 1.12.6 Examination of Standby Instruments The SAI was recovered and examined to determine whether it was electrically powered and functional prior to impact, and to determine whether the indicator could help
Open final report at PDF page 108TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 162. PDF page 174.

provide it. No specific training was provided on flying the aircraft using only the standby instruments; there is also no regulatory requirement for such training. Several operators of transport category aircraft were canvassed to determine whether they provided this t
Open final report at PDF page 174TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 193. PDF page 205.

0125:33, the first officer indicated that his side was all dark, and also made reference to standby instruments and speed. It is likely that the first officer's three DUs (DU 4, DU 5, and DU 6) had gone blank. For
Open final report at PDF page 205TSB A98H0003: In-flight fire leading to collision with water