Service difficulty report · Control Valve · Boeing 737890
FAA SDR system
- Difficulty date
- August 3, 2014
- Submitted
- August 5, 2014
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35683
- Aircraft time
- 26,448 hours, 7,984 cycles
- Part
- Control Valve
- Condition
- Failed
- Location
- Nr 2 Precooler
- Part time
- 51,867 hours, 25,964 cycles
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURE DUCT SPLIT - DUCT PRESSURE 43 LT WITH 16 RT INFLIGHT 350 FL AT -47 DEGREE C AT CRUISE DUCT PRESSURE MATCH UP AT 30 PSI IN DESCENT. ACFT GROUNDED. REPLACED PRECOOLER CONTROL VALVE IAW AMM 36-12-02. REPLACED 450 DEGREE THERMO IAW AMM 36-11-05. GROUND VERIFICATION GOOD.