Service difficulty report · Shutoff Valve · Boeing 737990ER
FAA SDR system
- Difficulty date
- July 3, 2021
- Submitted
- July 7, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41705
- Aircraft time
- 28,737 hours, 9,242 cycles
- Part
- Shutoff Valve
- Part number
- 32145526
- Part serial
- 11409
- Condition
- Inoperative
- Location
- Nr 1 Pneumatic
- Part time
- 41,233 hours, 13,997 cycles
- Stage of operation
- CL
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PRESSURE DIFFERENTIAL AT CLIMB POWER GOES TO NEAR 0 DIFFERENTIAL AT CRUISE POWER. @10,000' CLIMB L-68PSI R-39PSI. FL330 CLIMB N1 100.2% L-66PSI R-39PSI. FL340 CLIMB 100.5% N1 L-57PSI R-42PSI. FL340 CRZ N1 88.7% L-44PSI R-43PSI. FL360 CRZ N1 88.4% L-40PSI R-40PSI. GROUNDED - YES. ACCOMPLISHED B737-900 FIM 36-10 TASK 803 FOUND PRSOV STICKING & GRINDING DURING WRENCH CHECK, REMOVED AND REPLACED LH PRSOV PER B737-900 AMM 36-11-04 PRSOV INSTALLATION TEST CHECKS GOOD.