SDR HALA2017072400207

Service difficulty report · Adc · Boeing 7673CB

Difficulty date: July 21, 2017
Submitted: July 24, 2017
Operation: Air carrier
Aircraft: N592HA
Make and model: Boeing 7673CB
Aircraft serial: 33468
Aircraft time: 53,099 hours, 9,799 cycles
System (JASC): 3417 · Air Data Computer
Part: Adc
Part number: 4040800912
Part serial: 82070205
Condition: Malfunctioned
Part time: 8,566 hours, 1,727 cycles
Stage of operation: DE
How discovered: 9
Nature of condition: N
Precautionary procedure: O

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

What was found

RT BLEED LIGHT, FOLLOWED BY RT PRV EICAS, DURING 300FPM DESCENT FROM FL380 TO 370. ACCOMPANIED BY DUCT PRESSURE FLUCTUATION BETWEEN 20-35PSI. CHECKED AIR SUPPLY BITE MODULE, NO FAULT FOUND. CLEARED MESSAGE. PERFORMED BLEED VALVE CHECK BY ENGINE RUN IAW AMM 36-11-00, OPS NORMAL.

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