SDR UIEA2017100301922

Service difficulty report · Valve · Boeing 767306

Difficulty date: October 3, 2017
Submitted: October 6, 2017
Operation: Air carrier
Aircraft: N1229A
Make and model: Boeing 767306
Aircraft serial: 28884
Aircraft time: 66,663 hours, 14,196 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Valve
Part number: 80217010
Part serial: 200207065
Condition: Failed
Stage of operation: AP
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

DURING CLIMB OUT, 5000 FT THRU 15000 FT, THE LEFT DUCT PRESSURE SURGED FROM AROUND 40 PSI TO 10 PSI CONSTANTLY. DURING DESCENT, LEFT DUCT PRESSURE FLUCTUATED BY 30 PSI FROM 40 TO 10 PSI CONSTANTLY. SHUT THE LEFT PACK OFF TO MITIGATE SURGE. R & R PRV IAW AMM 36-11-18, OPS CHECKED GOOD, NO DEFECT NOTED.