# SDR CALA2026102620567

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 22, 2026
- Submitted: October 26, 2026
- Operation: Air carrier
- Aircraft: [N78004](https://openairdocs.org/aircraft/N78004), registered now
- Make and model: Boeing 777224
- Aircraft serial: 27580
- Aircraft time: 127,403 hours, 13,222 cycles
- Engine: Ge GE9094B
- System (JASC): [2560 · Emergency Equipment](https://openairdocs.org/jasc/2560)
- Part: Battery Pack
- Part number: 285W0955102
- Part serial: D02599
- Condition: Inoperative
- Location: Epas
- Part time: 788,454 hours, 711,037 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026102620567

## Discrepancy

DURING REPLACEMENT OF R4 DOOR SLIDE THE EPAS SYSTEM ACTIVATED AND BLEW THE DOOR OPEN. AFTER FURTHER TS FOUND DOOR 4R SAFETY SWITCH TO BE FAULTED. WITH BATTERY PACK SWITCH ON DISARM POSITION EPASS BOTTLE SQUIB CONNECTOR DM52109 PIN 1 WAS GETTING CONSTANTLY. REF SSM 52-11-13-101.  R & R R4 EPAS RESERVOIR, OPS CHECK GOOD IAW AMM 52-11-22.   R & R R4 EPAS BATTERY PACK, OPS CHKD GOOD IAW AMM 52-11-20.

---
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.