What was found
APU HAS HISTORY OF BLUE MAINT LIGHT ILLUMINATION WITH LOW OIL LEVEL FAULTS WHEN APU IS FULL. GROUNDED - YES. REMOVED AND REPLACED APU OIL LEVEL SENSOR PER AMM 49-94-11. PERFORMED OIL LEVEL SENSOR INSTALLATION TEST, NO PROBLEMS FOUND.
- Difficulty date
- March 5, 2019
- Submitted
- March 6, 2019
- Operation
- Air carrier
- Aircraft
- N566AS
- Make and model
- Boeing 737890
- Aircraft serial
- 35182
- Aircraft time
- 46,479 hours, 13,909 cycles
- System (JASC)
- 4990 · APU Oil System
- Part
- Sensor
- Part number
- 38762983
- Part serial
- 080147001991
- Condition
- Failed
- Location
- Apu
- Part time
- 10,240 hours, 18,435 cycles
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- N
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.