What was found
#1 ENG REAR TURBINE FLANGE ASSY IS CRACKED AT ALL INTERMEDIATE HOLE LOCATIONS. GROUNDED - YES. REMOVED AND REPLACED #1 ENG REAR TURBINE FLANGE ASSY REF. B737-900 AMM 72-56-00-401. THIS CLEARS MCT DEFERRAL.
- Difficulty date
- December 19, 2018
- Submitted
- December 24, 2018
- Operation
- Air carrier
- Aircraft
- N413AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 35205
- Aircraft time
- 22,834 hours, 7,451 cycles
- Engine
- Cfmint CFM567B27E
- System (JASC)
- 7250 · Turbine Section
- Part
- Flange
- Part number
- 3401688020
- Condition
- Cracked
- Location
- Nr 1 Rear Turbin
- Stage of operation
- IN
- 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.