SDR CA121129004

Service difficulty report · Transformer · Boeing 737*

Difficulty date: November 25, 2012
Submitted: September 14, 2015
Operation: General aviation
Make and model: Boeing 737*
Engine: Cfmint CFM563C1
System (JASC): 2450 · AC Power Distribution System
Part: Transformer
Part number: FT1145
Condition: Failed
Location: Electrical
Stage of operation: NR
How discovered: 9
Nature of condition: H
Precautionary procedure: O

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

What was found

(CAN) CARRYING OUT A PREFLIGHT INSPECTION ENGINEER NOTED 28V, CB NR 1 TO BE TRIPPED. TROUBLESHOOTING CARRIED OUT AND FOUND AUTOTRANSFORMER T39 TO SHOW SIGNS OF ELECTRICAL ARCING AND TO BE INOPERATIVE. TRANSFORMER REPLACED WITH NEW, SYSTEMS TROUBLESHOT WITH NO OTHER FAULTS NOTED. DAMAGED TRANSFORMER, PN FT1145, SN 7600, MFG 1990.