What was found
NR 1 AFT BOOST PUMP LOW PRESSURE LIGHT REMAIN OFF AT ALL TIMES. GROUNDED-YES. REPLACED NR 1 TANK AFT PRESSURE SWITCH (S150), PER B737-900 AMM 28-42-11/401. OPERATIONS GOOD, PER AMM TASK 28-42-11-700-801.
- Difficulty date
- December 7, 2020
- Submitted
- December 9, 2020
- Operation
- Air carrier
- Aircraft
- N403AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41730
- Aircraft time
- 30,610 hours, 9,894 cycles
- System (JASC)
- 2822 · Fuel Boost Pump
- Part
- Pressure Switch
- Part number
- 21C1321
- Condition
- Inoperative
- Location
- Lt Boost Pump
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.