What was found
DURING WALK AROUND FOUND LH ENG HAS OIL LEAK. FOUND LT AIR/OIL HEAT EXCHANGER VALVE RETURN TUBE LEAKING OIL. TIGHTENED RETURN TUBE B-NUT PER AMM 79-21-09
- Difficulty date
- July 31, 2025
- Submitted
- August 1, 2025
- Operation
- Air carrier
- Aircraft
- N566NC
- Make and model
- Boeing 7673BG
- Aircraft serial
- 30566
- Aircraft time
- 78,372 hours, 20,249 cycles
- Engine
- Pwa PW4060
- System (JASC)
- 7261 · Turbine Engine Oil System
- Part
- B-Nut
- Condition
- Leaking
- Location
- Engine Oil
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- K
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.