SDR ASAA2017112222712

Service difficulty report · Shutoff Valve · Boeing 737990ER

Difficulty date: November 22, 2017
Submitted: November 29, 2017
Operation: Air carrier
Aircraft: N464AS
Make and model: Boeing 737990ER
Aircraft serial: 40714
Aircraft time: 14,391 hours, 4,709 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Shutoff Valve
Part number: 32145526
Part serial: 7825
Condition: Failed
Location: Nr 1
Part time: 47,126 hours, 19,467 cycles
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

DUCT SPLIT AT CRUISE. FL 350, N1 90, L-20, R-38. FL 370, N1 90, L-18, R-40. ACFT GROUNDED. WHILE ACCOMPLISHING TC NG-36WC-00001, FOUND PRSOV UNSERVICEABLE. REMOVED AND REPLACED PRSOV, REF B737-900 AMM 36-11-04/401. COMPLETED T/C NG-36WC-00001. OPS CHECK GOOD.