- Difficulty date
- March 15, 2023
- Submitted
- March 17, 2023
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35187
- Aircraft time
- 57,731 hours, 16,952 cycles
- Part
- Bleed Valve
- Part number
- 32145526
- Part serial
- 7840
- Condition
- Failed
- Location
- #1 Engine
- Part time
- 56,544 hours, 20,157 cycles
- Stage of operation
- NR
- How discovered
- V
- Nature of condition
- J
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT PRESSURE DIFFERENTIAL DURING FLIGHT GREATER THAN 20 PSI. 5000FT R-40PSI L-5PSI, 10000FT R-45 L-7, 20000FT R-47 L-7, 30000FT R-47 L-8@ 340FL CABIN ALT 7200, DIFF 7.7. GROUNDED - YES. ACCOMPLISHED #1 ENGINE PNEUMATIC SYSTEM HEALTH CHECK REF. TC NG-36WC-0002-1. FOUND PRSOV BAD. REMOVED & REPLACED PRSOV REF. B737-800 AMM 36-11-04.