SDR ASAA2020070632866

Service difficulty report · Shutoff Valve · Boeing 737990ER

Difficulty date: July 3, 2020
Submitted: July 6, 2020
Operation: Air carrier
Aircraft: N413AS
Make and model: Boeing 737990ER
Aircraft serial: 35205
Aircraft time: 28,227 hours, 9,044 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Shutoff Valve
Part number: 32145526
Part serial: 12904
Condition: Stuck
Location: Bleed Air Sys
Part time: 27,081 hours, 9,408 cycles
Stage of operation: TO
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

LEFT BLEED DUCT PRESSURE 8 PSI AT TAKEOFF, CLIMB, CRUISE, RIGHT BLEED DUCT PRESSURE 42 PSI. GROUNDED - YES. PERFORMED AMM 36-11-00-700-805, FOUND PRSOV JAMMED IN CLOSED POSITION. R&R PRSOV REF AMM 36-11-04-000-801/36-11-04-400-801. PRSOV INSTALLATION TEST GOOD, NO LEAK NOTED. PERFORMED BLEED AIR CROSSOVER OPS TEST REF AMM 36-11-00-710-801, OPS CK GOOD.