SDR UIEA2020090851953

Service difficulty report · Sensor · Boeing 7673Y0

Difficulty date: September 5, 2020
Submitted: September 8, 2020
Operation: Air carrier
Aircraft: N1181A
Make and model: Boeing 7673Y0
Aircraft serial: 26206
Aircraft time: 88,427 hours, 22,176 cycles
System (JASC): 2913 · Hydraulic Pump (Electric/Engine), Main
Part: Sensor
Condition: Loose
Location: Hyd Pump
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

APU SHUTDOWN TWICE PRIOR TO START, AFTER HYDRAULIC FUEL PUMPS TURNED ON. TURNED PACK OFF PRIOR TO THIRD HYD POWER UP, NORMAL START. PERFORMED APU BITE PER FIM 49-11 FT 958 "REVERSE FLOW" AS REASON FOR SHUTDOWNS. TIGHTENED INLET TEMP SENSOR FOR LCIT IAW FIM 49-11 FIG. 103, TABLE A AND AMM 49-61-03 OPERATIONAL TEST OF APU PASSED.

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