# SDR CALA2026031814656

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 15, 2026
- Submitted: March 18, 2026
- Operation: Air carrier
- Aircraft: [N77542](https://openairdocs.org/aircraft/N77542), registered now
- Make and model: Boeing 737824
- Aircraft serial: 63647
- Aircraft time: 26,277 hours, 9,920 cycles
- Engine: Cfmint CFM567B262
- System (JASC): [7320 · Fuel Controlling System](https://openairdocs.org/jasc/7320)
- Part: Hmu
- Part number: 442653
- Part serial: BECWB632
- Condition: Faulted
- Location: Nr 1 Engine
- Part time: 36,673 hours, 7,245 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: Y
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026031814656

## Discrepancy

LEFT ENG EGT OVERTEMP DURING AIR RESTART.  ENGINE EXCEEDANCES ON E1, PEAK: 795.5 AND RED: 725.0 0:15.6 SECONDS.  PERFORMED HPT AND LPT STAGES 1-3 BOROSCOPE WITH NO LIMITING FINDINGS OBSERVERED. REMOVED NR 1 ENGINE HMU IAW AMM 73-21-10/401. IAW FIM TASK 80-05-803 INSPECTION AFTER ENGINE OPS ABOVE THE LIMITS AND HIGH ENGINE STRESS IAW AMM 71-00-00-800-804-F00.  INSTALLED HMU IAW AMM. 73-21-10-400-801-F00 UP TO AND INCLUDING STEPS G. (1) (G) 2).   VERIFIED THE REPLACEMENT OF O-RINGS AND INSTALLATION OF THE HMU IAW AMM 73-21-10-400-801-F00  COMPLETION OF THE INSTALLATION TESTS FOR THE NR 1 ENG HMU IAW AMM 73-21-10-400-801-F00. OPS CHECKS GOOD, NO LEAKS NOTED.

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