What was found
AT TOP OF DESCENT WHEN THRUST WAS REDUCED THE LEFT DUCT PRESSURE PULSED 30 PSI +15 --25. FOUND IP CHECK VALVE SHEARED OFF. REPLACED CHECK VALVE. ACP HIGH PWR RUN AND SNAP DECEL. ALL ENG PARAMETERS WERE NORMAL.
- Difficulty date
- May 6, 2011
- Submitted
- May 12, 2011
- Operation
- Air carrier
- Aircraft
- N653UA
- Make and model
- Boeing 767322
- Aircraft serial
- 25391
- Aircraft time
- 80,192 hours, 12,953 cycles
- Engine
- Pwa PW4060
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Check Valve
- Part number
- 77385616
- Part serial
- 42
- Condition
- Sheared
- Location
- Bleed Air Sys
- Stage of operation
- DE
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.