Service difficulty report · Junction Box · Cessna 550

Difficulty date
May 23, 1996
Submitted
March 26, 2000
Operation
Air carrier
Make and model
Cessna 550
Engine
Pwa JT15D4
Part
Junction Box
Part number
553832816
Condition
Mis Wired
Location
Thrust Rev
Stage of operation
IN
Nature of condition
W
Precautionary procedure
K

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

What was found

(CAN) WHILE PERFORMING A ROUTINE PHASE 5 INSPECTION, THE TECHNICIAN FOUND THAT IMPROPER WIRING PROCEDURES WERE FOLLOWED DURING MANUFACTURE OF THE THRUST REVERSER JUNCTION BOX P/N 5538328-16 REF. IPC 78-30-03. IT WAS NOTED THAT SEVERAL WIRES WERE INCORRECTLY ROUTED AND SUPPORTED. WIRES WERE RUNNING AGAINST OR THROUGH THE HEAT SINK ASSEMBLY. THIS IS CONTRARY TO STANDARD PRACTICES AC 43.13.1A, PAR 447 & 448. SOME WIRE TENSIONS WERE TOO TIGHT, CAUSING COMPONENTS TO FRACTURE. DIODE D171 CATHODE LEAD FRACTURED DUE TO STRESS AND VIBRATION BY A TY-WRAP. DEFECTIVE COMPONENTS WERE REPLACED AND REPAIRED IN ACCORDANCE WITH STANDARD PRACTICES.

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