Service difficulty report · Transformer · Boeing 767324

Difficulty date
August 22, 2025
Submitted
August 25, 2025
Operation
Air carrier
Aircraft
N676UA
Make and model
Boeing 767324
Aircraft serial
30028
Aircraft time
84,805 hours, 16,255 cycles
Part
Transformer
Part number
Y35A
Condition
Faulted
Location
Zone 200
Stage of operation
AP
How discovered
O
Nature of condition
F, J
Precautionary procedure
O

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

What was found

LE SLAT ASYMSLAT/FLAPS INDICATION STUCK POSITION 1. FLAPS RETRACTED AND LEVER FULLY RETRACTED. ACCOMPISHED PSEU BITE PROCEDURE 32-09 FAULT TREE 803 ( BLOCK 3). CODES: 301, 423. CONTINUE FROM BLOCK 3. PICTURE UPDATE LABOR HOURS UPDATED PERFORMED PSEU BITE FIM 32-09 FAULT TREE 803, ONLY CODE 301 SHOWED. SECOND BITE ONLY CODE 423 SHOWED. EXAMINED AND CLEANED R SLAT #11 INBOARD SENSOR AND TARGET. CYCLED SLATS MULTIPLE TIMES, SLATS WERE EXTENDING AND RETRACTING NORMAL. PERFORMED PSEU BITE ADD EMP:U432505 AGAIN NO FAULTS SHOWN. REF FIM 32-09 FAULT TREE 803 BLOCK 8 FOR INTERMITTENT FAULT REQUIRES PROXIMITY SENSOR/WIRING RESISTANCE CHECK, FIM 32-09-00/101 FIG 105 SLAT/FLAPS INDICATION RETURNED TO UP POSITION UPON CYCLING. UPDATING PARTS INFO AND MAN HOURS AS PRECAUTIONARY PERFORM FIM 27-81 FAULT TREE 809 FOR EICAS MSG LE SLAT ASYM. FIM 27-81 FAULT TREE 809 WILL NEED TO BE ACCOMPLISHED FOR EICAS MSG LE SLAT ASYM REQUESTING AVIONICS SUPPORT TS PER WDM 27-88-22-1 PERFORMED WIRING CHECKS FOR RIGHT OUTB SLAT 11 PROX SENSOR S301 FROM PSEU PINS K5,J5 OF D2166B WIRING CHECKS FAILED PROX SENSOR READS 28.9 OHMS. PER FIM 32-09 FAULT TREE 805 NEEDS TO BE LESS THAN 25 OHMS. CHECK AIRCRAFT WIRING WITH SENSOR DISCONNECTED WIRING CHECK OK. REMOVED AND REPLACED PROX SENSOR S301 PER WDM 27-88-22-1 RESISTANCE CHECKS ARE NOW GOOD 21 OHMS. NEEDS TO PERFORMED OPS CHECKCONTINUED INSTALLATION OF S301 LEADING EDGE SLAT SENSOR SWITCH IAW AMM 27-88-01-902-001 FROM STEP G(8) TO COMPLETION. OPS CHECKS PASSED.