What was found
(CAN) APU OVERSPEED LIGHT ILLUMINATED DURING APU START. THE MAINTENANCE INVESTIGATION FOUND A BORESCOPE PLUG WAS FOUND IN THE APU BAY, NO LONGER INSTALLED IN THE APU WHICH CAUSED A BLEED AIR LEAK.
- Difficulty date
- January 15, 2019
- Submitted
- August 13, 2020
- Operation
- General aviation
- Make and model
- Boeing 737200
- Aircraft time
- 50,396 hours
- System (JASC)
- 4920 · APU Core Engine
- Part
- Plug
- Part number
- 380428101
- Condition
- Dislodged
- Location
- Borescope
- Stage of operation
- NR
- 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.