What was found
LH ENGINE BLEED DOES NOT CLOSE ON ENGINE SHUTDOWN, CAUSES A LOW RUMBLING NOISE WITH AIR HISSING OUT FROM APU BLEED. THIS HAS BEEN AN INTERMITTENT ISSUE. REMOVED AND REPLACED THE LH PRSOV IAW AMM 36-11-09 OPS NORMAL
- Difficulty date
- June 7, 2025
- Submitted
- June 11, 2025
- Operation
- Air carrier
- Aircraft
- N567NC
- Make and model
- Boeing 76733A
- Aircraft serial
- 28141
- Aircraft time
- 69,664 hours, 12,879 cycles
- Engine
- Pwa PW4060
- System (JASC)
- 7500 · Engine Bleed Air System
- Part
- Shutoff Valve
- Part number
- 77328810
- Part serial
- 830613
- Condition
- Failed
- Location
- Lt Engine
- Part time
- 101 hours, 37 cycles
- Stage of operation
- TX
- 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.