SDR SWAA110241

Service difficulty report · Shutoff Valve · Boeing 7377H4

Difficulty date: January 12, 2011
Submitted: January 14, 2011
Operation: Air carrier
Aircraft: N403WN
Make and model: Boeing 7377H4
Aircraft serial: 29815
Aircraft time: 35,989 hours, 20,695 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Shutoff Valve
Part number: 001A0101
Condition: Malfunctioned
Location: Bleed Air Sys
Stage of operation: CR
How discovered: O
Nature of condition: B
Precautionary procedure: A

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

What was found

DIVERSION / DECLARED EMERGENCY. AT CRUISE ALTITUDE FL 400 RIGHT "BLEED TRIP OFF" LIGHT ILLUMINATED. AFTER RESETTING. THE LIGHT TRIPPED OFF AGAIN AND SMOKE/HAZE BEGAN FILLING THE COCKPIT. FOUND PNEUMATIC SYSTEM FAULTY. REMOVED AND REPLACED NR 2 PRSOV, NR 2 PRECOOLER CONTROL VALVE, NR 2 BLEED AIR REGULATOR, NR 2 ENGINE 450 DEGREES THERMOSTAT, AND PRECOOLER CONTROL VALVE SENSOR PER MM.

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