- Difficulty date
- July 4, 2022
- Submitted
- July 6, 2022
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 36362
- Aircraft time
- 29,644 hours, 9,533 cycles
- Engine
- Cfmint CFM567B27E
- Part
- Valve
- Part number
- 32911867
- Part serial
- GRTV5147
- Condition
- Faulty
- Location
- #1 Engine
- Part time
- 36,253 hours, 12,204 cycles
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS #1 ENGINE (ESN 658291), TREND DATA SHOWS A GRADUAL INCREASE IN DELTA EGT, DELTA FUEL FLOW AND A DECREASE IN DELTA CORE SPEED. CNR 20220614003 ISSUED. GROUNDED - YES. REMOVED AND REPLACED #1 ENG HPTACC VALVE IAW B737-900 AMM 75-21-01. LEAK & OPS CHECKED GOOD.