SDR ASAA2021112536749

Service difficulty report · Actuator · Boeing 737990ER

Difficulty date: November 25, 2021
Submitted: November 30, 2021
Operation: Air carrier
Aircraft: N492AS
Make and model: Boeing 737990ER
Aircraft serial: 44110
Aircraft time: 22,123 hours, 7,041 cycles
System (JASC): 7530 · Compressor Bleed Control
Part: Actuator
Part number: 1226400
Part serial: YU125995
Condition: Faulty
Location: #1 Engine
Part time: 22,150 hours, 7,048 cycles
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

REF T/C 78273000, ENG # 1 SHORT TIME FAULT 75-30451, THE VSV POSITION SIGNALS DISAGREE. FAULT SET ON LEG 1,2,4 AND 8. GROUNDED - YES. NO RECENT FAULTS FOUND IN CDU. FAULT HISTORY SHOWED FC 75-30451 ON LEGS 8 AND 9. EEC TEST PASSED, REMOVED AND REPLACED #1 ENG RH VBV VALVE ASSY. REF B737-900 AMM 75-32-02 SYSTEM OPS CK. NO LKS OR FAULTS NOTED.