Service difficulty report · Conduit · Boeing 75728A

Difficulty date
January 23, 2012
Submitted
September 14, 2015
Operation
General aviation
Make and model
Boeing 75728A
Aircraft time
47,981 hours
Engine
Rroyce RB211535E4
Part
Conduit
Part number
287N610233
Condition
Short
Location
Rt Mlg
Part time
60,241 hours
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

(CAN) DURING TAXI THE ANTI-SKID WARNING LIGHT ILLUMINATED INTERMITTENTLY. THE ANTI-SKID SYS WAS DEFERRED IAW THE MEL 32-42-01-1. THERE WAS SIMILAR OCCURRENCE ON 22 DEC 2011 ON THIS SAME ACFT WHICH WAS REPORTED ON SDR 20111228002. AT THE NEXT MAINTENANCE OPPORTUNITY, INVESTIGATION REVEALED THAT CLAMP ASSY, PN BC1083-074S WAS BROKEN AND HAD FAILED IN OVERLOAD. THE ANTI-SKID WIRING AND CONDUITS WERE DAMAGED ALSO. THE DAMAGED CLAMP, WIRING AND CONDUITS WERE REPAIRED. FOR THIS DAMAGE TO OCCUR, IT APPEARS THAT THE PLATE ASSY THAT THE CLAMP SECURES WAS BEING PULLED UPWARDS, WHEN THE OLEO IS AT FULL EXTENSION, BY THE 2 FLEXIBLE WIRING CONDUITS THAT TRAVEL UP THE GEAR LEG, PN 287N6102-33, IPC 32-61-52-02H, ITEM 280. FURTHER INVESTIGATION REVEALED THAT THESE 2 FLEXIBLE CONDUITS ON THE RT GEAR ARE ABOUT 2" SHORTER THAN THE ONES ON THE LT MLG, WHICH MEASURED 51.5, THE 2 CONDUITS ON THE RT GEAR ARE THE CORRECT LENGTH IAW THE DWG 49.25. THE 2 CONDUITS ON THE RT MLG APPEAR TO HAVE BEEN RECENTLY REPLACED, HOWEVER THE EXACT TIME SINCE INSTALLATION IS NOT KNOWN DUE TO ACFT LEASE ARRANGEMENTS. INVESTIGATION IS STILL ONGOING INTO THIS APPARENT DISCREPANCY WHICH APPEARS TO BE THE ROOT CAUSE OF THE DAMAGE TO THE CLAMP AND WIRING HARNESSES.

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