Service difficulty report · Drive Unit · Boeing 7879

Difficulty date
December 3, 2024
Submitted
December 6, 2024
Operation
Air carrier
Aircraft
N29968
Make and model
Boeing 7879
Aircraft serial
60141
Aircraft time
36,395 hours, 3,583 cycles
Part
Drive Unit
Condition
Failed
Location
Slat System
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

SLATS DRIVE CAUTION PRIMARY AND SECONDARY SLAT DRIVES HAVE FAILED TO OPERATE, OR HAV E BEEN SHUT DOWN BECAUSE OF AN ASYMMETRY, SKEW/LOSS, DISAGREE, O R UNCOMMANDED MOTION. FIM TASK REF : 27-80-F1-70A-421A-A CMC MSG# 2722321 FLIGHT STATUS: A INTERMITTENCE CODE: H PH: CLIMB NARRATIVE: 27 FCM OPS (RIGHT) FIM TASK 27-80-F1-29A-421A-A FOR MAINTENANCE MSG 27-22321 ACTIONED UP TO STEP 1.B.1.C. CMCF TEST 27 HIGH LIFT SYSTEM, SYSTEM TEST, SLATS PRIMARY FCM L CARRIED OUT. TEST PRODUCES NO FAULTS. PRELIMINARY INSPECTION OF CONNECTORS DE2702003P03B & DM2789051P01 CARRIED OUT WITH NO OBVIOUS SIGNS OF DAMAGE. WIRING CHECKS TO BE COMPLETED PER FIM TASK. BCN NUMBER UAL-UAL-24-3018-02B(R01). CARRY OUT AMM 27-89-05-00B-340A-A FOR OUTBOARD LEADING EDGE SLAT BREAKAWAY CONNECTOR FUNCTIONAL TEST AND LANYARD RIGGING. REFERENCE LOGPAGE 3096398 FOR COMPLETED WIRING CHECKS REF LOG PAGE 3096432 FOR ADJUSTMENT OF #5 SLAT BREAKAWAY LANYARD & TURNBUCKLE AS PER 27-89-05-00B-340A-A AND INSPECTOR ITEM. ALL SUBSEQUENT REQUIRED AMM TESTS PASSED ON GROUND. AS PER FIM 27-80-F1-29A-421A-A OK TO CONTINUE.

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