Service difficulty report · Switch · Boeing 75733N

Difficulty date
October 7, 2026
Submitted
October 9, 2026
Operation
Air carrier
Aircraft
N57864
Make and model
Boeing 75733N
Aircraft serial
32588
Aircraft time
75,067 hours, 23,114 cycles
Engine
Rroyce RB211535E4
Part
Switch
Part number
254N11848
Part serial
A4546
Condition
Faulty
Location
Thrust Reverser
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

RIGHT REVERSER STOW SIG & RT REVERSER ISOLATION VALE STATUS MESSAGES APPEARED AFTER TAKEOFF. PERFORMED PSEU BITE FOUND NO ACTIVE FAULTS, ON LEG 00, FOUND 5 FAULTS (RT T/R DEPLOYED AIR 78-34070) (RT T/R AUTO RESTOW AIR 78-34071) (RT T/R STOWED AIR 78-34036) (RT T/R IN TRANSIT AIR 78-36092) (RT T/R NOT LOCKED AIR 78-36083). PSEU SYSTEM TEST PASSED. IAW FIM 32-09, FAULT TREE 812. WHILE PERFORMING CONTINUITY TEST OF S24 & S26. FOUND S26 NOT SWITCHING TO THE DEPLOY POSITION. S24 OPERATED NORMALLY IAW AMM 22-32-04, FOLLOWED FIM 78-36 FAULT TREE 811 THROUGH BLOCK 1 REV ISOLATION VALE EICAS MESSAGE WAS SHOWN, 31 NO DEV FAULT ON PSEU, 61 CLEARANCE CHK ON S10105, S10108 CHKD GOOD. PERFORMED IDUCTANCE & RESISTANCE CHK ON S10105, S10108, S164, S166 ALL CHKD GOOD. LCR METER DIED UNABLE TO CHECK S165, 167. REF SSM 78-36-01-104, 78-34-02-104, FIM 32-09 FAULT TREE 821. PUT AFTC IN AIR MODE TO DUPLICATE FAULT, NO JOY, NO FAULTS INDUCED WHILE MOVING THROTTLE IAW 32-09-02, R & R MICRO SWITCH PACK ASSY IAW AMM 22-32-04. FOUND S26 OF OUT OF ADJUST, ADJUSTED S26 & PERFORMED THE AUTOTHROTTLE SWITCH PACK TEST IAW AMM 22-32-04. TESTED GOOD. PERFORMED THE PSEU SYSTEM TEST IAW AMM 32-09-04 & RAN T/R MULTIPLE TIMES, NO STATUS FAULT IS DISPLAYED. TESTED GOOD.

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