SDR DL72S001990

Service difficulty report · Isolation Valve · Boeing 727232

Difficulty date: October 12, 2000
Submitted: October 18, 2000
Operation: Air carrier
Aircraft: N535DA
Make and model: Boeing 727232
Aircraft serial: 22048
Aircraft time: 59,910 hours, 44,420 cycles
System (JASC): 3010 · Airfoil Anti/De-ice System
Part: Isolation Valve
Condition: Chafed
Location: Rt Deice System
Stage of operation: NR
How discovered: O
Nature of condition: B
Precautionary procedure: H

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

What was found

WHILE TROUBLESHOOTING WING ANTI-ICE PROBLEM FOUND RIGHT BLEED AIR ISOLATION VALVE WIRING CHAFING ON PNUEMATIC DUCT BETWEEN THE VALVE AND THE AFT PACK VALVE. WHILE INSTALLING PNUEMATIC DUCT FOUND WIRE BUNDLE FOR LEFT BLEED ISOLATION VALVE CHAFED. REPAIRED WIRING HARNESS, VALVE OPERATES NORMAL. REPLACED DAMAGED PNEU DUCT, LEAK CKS OK.