# SDR AALA202604213464

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 17, 2026
- Submitted: April 22, 2026
- Operation: Air carrier
- Aircraft: [N973NN](https://openairdocs.org/aircraft/N973NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31219
- Aircraft time: 32,234 hours, 13,792 cycles
- Engine: Cfmint CFM567B24E
- System (JASC): [7311 · Engine Fuel/Oil Cooler](https://openairdocs.org/jasc/7311)
- Part: Fuel Heater
- Part number: 457311382
- Part serial: DY991872U
- Condition: Leaking
- Location: Rt Engine
- Part time: 25,516 hours, 11,128 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202604213464

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: RIGHT ENGINE FUEL FILTER BYPASS. LIGHT ILLUMINATED SHORTLY AFTER REACHING CRUISE ALTITUDE AT THE SAME TIME AS CENTER TANK REACHED ZERO FUEL. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. REMOVED AND REPLACED ENGINE NUMBER 2 FUEL FILTER (AALA202604215499) AND DIFFERENTIAL PRESSURE SWITCH (AALA202604214379), PER AMM 73-11-02 AND AMM 73-34-01. FOUND SERVO FUEL HEATER LEAKING, REMOVED AND REPLACED ENGINE NUMBER 2 SERVO FUEL HEATER (AALA202604213464) PER AMM 73-11-07. ALL OPS AND LEAK CHECK GOOD. ACCOMPLISHED GOOD ENGINE RUNS.

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