Service difficulty report · Computer · Boeing 737275

Difficulty date
October 7, 1997
Submitted
March 26, 2000
Operation
Air carrier
Make and model
Boeing 737275
Engine
Pwa JT8D9A
Part
Computer
Part number
HG480B20
Condition
Failed
Location
Air Data
Component
Kollsman · G480B20
Stage of operation
CR
How discovered
O
Nature of condition
G, J
Precautionary procedure
I, B, G

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) IN CRUISE AT 35,000 AUTO PILOT TRIPPED OFF FOLLOWED BY MACH TRIM FAIL LIGHT ON. CAPTAIN ALTIMETER RED FLAG CAME IN VIEW, ALTIMETER ALERT FLAG ON GPWS INOPERATIVE LIGHT ON. TCAS FAILED, SHORTLY THEREAFTER CABIN ALERT HORN SOUNDED, O2 MASKS DEPLOYED, EMERGENCY DESCENT. AIR DATA COMPUTER REPLACED.