# SDR CALA2026100620142

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2026
- Submitted: October 6, 2026
- Operation: Air carrier
- Aircraft: [N76514](https://openairdocs.org/aircraft/N76514), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31626
- Aircraft time: 57,413 hours, 20,854 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007022
- Part serial: P5743
- Condition: Faulted
- Location: Zone 100
- Part time: 34,431 hours, 53,000 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026100620142

## Discrepancy

SMOKE ODOR CONDITIONAL INSP REQUIRED PER AMM 05-51-XX DUE TO AN INCIDENT REPORTED BY THE CREW. SMOKE IN THE COCKPIT FOLLOWED BY APU SHUT DOWN, APU GEN FEEDER CABLES APU MAINT MSG 49-72104. FOUND APU GENERATOR FEEDER CABLE BURNT.  FOUND FEEDER CABLES ON APU GEN CABLE MELTED SDR INFO UPDATED CABLES ARE OK. GENERATOR IS FRIED.  RANG FEEDER CABLES FROM APU GEN TO P-91 RIGID BUS ASSY REF WDM 24-21-31. CABLES ALL TEST OK. RESECURED TERMINALS TO RIGID BUS IAW AMM 24-21-22-400-801. NEED IDT VERIFICATION OF INSTALLATION.   CPW IDT INSP ATA CHP 24. CHECK FEEDER CABLES INSTALLATION FOR SAFETY AND SECURTY. FEEDER CABLES 3 EACH INSTALLATION SAFTETY AND SECURITY CHECHS GOOD AT TERMINALS TO RIGID BUS IN FWD E&E BAY ACCESS THROUGH FWD CARGO BAY FWD RT BULKHEAD PANEL. IAW AMM 24-21-22-400-801 REPLACED APU GCU AS PRECAUTION ON LOG PAGE 3586969. PERFORMED INSPECTION OF APU CHIP DETECTOR. PARTICLES OF SILVER METAL FOUND. AMM 49-91-81-200-801 . APU REPLACEMENT NECESSARY DUE TO INDICATION OF DAMAGE. APU CHIP DETECTOR WAS ACCOMPLISHED ON L/P 3583568. APU INOP, REQUEST MEL.  APU REPLACEMENT HAS BEEN ACCOMPLISHED .ALSO RECIRCULATION AIR FILTERS REPLACED. AMM TASK 21-25-01-400-801. NO FURTHER SMOKE ODOR PRECENT.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.