SDR ASAA2023062843814

Service difficulty report · Unknown · Boeing 737990ER

Difficulty date: June 28, 2023
Submitted: July 3, 2023
Operation: Air carrier
Aircraft: N487AS
Make and model: Boeing 737990ER
Aircraft serial: 44108
Aircraft time: 28,437 hours, 8,751 cycles
System (JASC): 7500 · Engine Bleed Air System
Part: Unknown
Part number: UNKNOWN
Condition: Unknown
Location: Unknown
Stage of operation: IN
How discovered: O
Nature of condition: J
Precautionary procedure: K

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

What was found

SHORT TIME FAULT 75-30451 "THE VBV POSITION SIGNALS DISAGREE" FOUND ON #1 ENGINE. GROUNDED - YES. REMOVED FAN DUCT PANELS. AFTER INSPECTION FOUND 3 EA RING GUIDE PADS DISBONDED. 1 EA PAD LODGED BETWEEN VBV ACTUATOR AT THE 6 O'CLOCK POSITION. ALL DISBONDED GUIDE PADS REMOVED IAW B737-900 FIM 75-32 TASK 801. REINSTALLED FAN DUCT PANELS IAW B737-900 AMM 72-23-07. COMPLIED WITH 71-00-00 TEST 12. OPS CHECK GOOD. FAULTS CLEARED.