Service difficulty report · Relay · Boeing 7378

Difficulty date
June 2, 2026
Submitted
June 3, 2026
Operation
Air carrier
Aircraft
N47291
Make and model
Boeing 7378
Aircraft serial
62182
Aircraft time
10,932 hours, 3,725 cycles
Part
Relay
Part number
M835362024M
Condition
Faulty
Location
Zone 100
Stage of operation
CR
How discovered
O
Nature of condition
F
Precautionary procedure
O

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

What was found

BOTH AUTOPILOTS WOULD NOT ENGAGE IN FLIGHT REF FIM 22-11 TASK D56. FOR CHANNEL A, FOUND MAINT MESSAGE 22-11127 AND 22-11208 PRESENT. FOR CHANNEL B, FOUND MAINT MESSAGE 22-11208 PRESENT. REMOVED RELAY R1193 AND CHECKED VOLTAGE. FOUND 25.5VDC PRESENT. REPLACED RELAY R1193 REF WDM 22-13-11. RERAN TESTS FOR MAINT MESSAGE 22-11208. NO FAULTS NOTED FOR CHANNEL A AND B. REF FIM 22-11 TASK 888 FOR MAINT MESSAGE 22-11127. PERFORMED INITIAL EVALUATION. TEST PASSED. WILL REQUIRE SUBSEQUENT FLIGHTS TO VERIFY FAULT IS RECTIFIED.

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