What was found
DUCT PERSSURE SPLIT OF 20 PSI, DURING CLIMB. LEFT 25 PSI RIGHT 45 PSI. GROUNDED - YES. REPLACED #1 PCV REF B737-900 AMM 36-12-02-400-801. OPS CK GOOD. CROSSOVER CK REF AMM 36-11-00-710-801 BOTH ENGINES NO DISCREPANCIES NOTED.
- Difficulty date
- July 20, 2022
- Submitted
- July 25, 2022
- Operation
- Air carrier
- Aircraft
- N459AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36352
- Aircraft time
- 31,177 hours, 9,840 cycles
- System (JASC)
- 3610 · Pneumatic Distribution System
- Part
- Valve
- Part number
- 632921461
- Part serial
- 130
- Condition
- Inoperative
- Location
- #1 Engine
- Part time
- 19,997 hours, 6,355 cycles
- Stage of operation
- CL
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.