SDR KCSA11025

Service difficulty report · Clamp · Boeing 747221F

Difficulty date: May 17, 2011
Submitted: May 18, 2011
Operation: Air carrier
Aircraft: N747CK
Make and model: Boeing 747221F
Aircraft serial: 21743
Aircraft time: 118,655 hours, 26,825 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Clamp
Condition: Loose
Location: Bleed Air Sys
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: E

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

What was found

NR 4 ENGINE FIRE WARNING LIGHT AND BELL LIGHT ILLUMINATED - EXTINGUISHED WHEN ENGINE SHUT DOWN. NO BOTTLE DISCHARGED. ENGINE WINDMILLED 53 MINUTES, 33 MINUTES AT 12 PSI, 20 MINUTES AT 4 PSI. COMPLIED WITH WINDMILLING PROCEDURE. FOUND BLEED AIR LEAK AT NR 4 ENGINE PRESSURE RELIEF VALVE CLAMP. RE-SECURED AS PER MM REF 36-11-03. LEAK CHECK OK. PERFORMED ENGINE WINDMILL INSPECTION PER MM REF 72-00-00. NO DISCREPANCY NOTED IAW AMM REF 36-11-00/501.