What was found
AIRCRAFT WAS GROUNDED: L PRSOV FAILED CLOSED MESSAGE AND FAILURE TO MAINTAIN CABIN PRESSURIZATION CAUSED AIR INTERRUPT AND RETURN TO FIELD. REPLACED LT ENGINE PRSOV IAW AMM 36-11-18, OPS CHECK GOOD.
- Difficulty date
- August 31, 2020
- Submitted
- September 1, 2020
- Operation
- Air carrier
- Aircraft
- N776AN
- Make and model
- Boeing 777223
- Aircraft serial
- 29582
- Aircraft time
- 84,745 hours, 10,293 cycles
- Engine
- Rroyce RB211TRENT89
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Shutoff Valve
- Part number
- 32153025
- Condition
- Inoperative
- Location
- Lt Engine
- Stage of operation
- CL
- How discovered
- C
- Nature of condition
- J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.