# SDR SWAA2025102005584

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 18, 2025
- Submitted: June 5, 2026
- Operation: Air carrier
- Aircraft: [N479WN](https://openairdocs.org/aircraft/N479WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33990
- Aircraft time: 70,135 hours, 42,348 cycles
- System (JASC): [2841 · Fuel Quantity Indicator](https://openairdocs.org/jasc/2841)
- Part: Compensator
- Condition: Leaking
- Location: Zone 600
- Stage of operation: CR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2025102005584

## Discrepancy

SUSPECTED FUEL LEAK. ALSO FUEL IMBALANCE RT SIDE FIRST THEN LEFT SIDE. 5.8 AT GATE IN JAX. SUPPOSED TO LAND WITH 6.6 IN MCO. ALSO HAD 6.3 AT GATE IN JAX. IT NOW STATES 5.7? (6.6). NH 30 DAYS. HANGAR REQUEST RECORD #4196<[01] ACCOMPLISHED GVI OF MAIN WING AND CENTER TANKS PER AMM 28-11-00; NO LEAKS NOTED. ACCOMPLISHED TANK FQIS TO STICK COMPARISON CHECK PER AMM 28-41-00; FOUND THE #2 MAIN TANK OUT OF TOLERANCE. OK TO CONTINUE PER MEL 28-6-01. C/W SP# 3 & SP# 1. AUTH # 288831.;[02] PERFORMED TANK AND COMPENSATOR UNITS - FUEL QUANTITY INDICATING SYSTEM HEALTH CHECK AS PER AMM 28-41-21 AND FOUND TANK UNIT 7 BELOW NORMAL READING.;[03] FOR COMPANY CONVENIENCE; R&R FUEL QUANTITY PROCESSOR PER AMM 28-41-81. FUEL QUANTITY PROCESSOR UNIT INSTALLATION TEST REQUIRED.;[04] PERFORMED FUEL QUANTITY PROCESSOR UNIT INSTALLATION TEST PER AMM 28-41-81; NO DEFECTS NOTED AT THIS TIME.;[05] R&R'D R/W FUEL QTY COMP + F3;F4;F5;F6;F7; & F8 FUEL QTY UNITS. REF: AEROTEAMS W/O 66-25188. R/W FUEL QTY OPS CHECKS GOOD PER AMM 28-41-21.

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