# SDR CALA2026101520380

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 11, 2026
- Submitted: October 15, 2026
- Operation: Air carrier
- Aircraft: [N14507](https://openairdocs.org/aircraft/N14507), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 11846
- Aircraft time: 7,527 hours, 2,757 cycles
- Engine: Iae PW1133GAJM
- System (JASC): [2565 · Escape Slide](https://openairdocs.org/jasc/2565)
- Part: Slide
- Part number: D30665915
- Part serial: M34952
- Condition: No Test
- Location: Zone 800
- Part time: 5,553 hours, 2,107 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026101520380

## Discrepancy

WHILE PERFORMING EMERGENCY LIGHT TEST, CIDS 1, EPSU SYS TEST FAILED.  REPLACED EPSU BATTERY AT 11WL IAW AMM 33-51-38, OPS CHECK OK. REPLACED EPSU BATTERY AT 17WL IAW AMM 33-51-38, OPS CHECK OK.   REPLACED EPSU BATTERY AT 13WL IAW AMM 33-51-38, OPS CHECK FAILS WITH MESSAGE -EXTERIOR LT 2/ EPSU (13WL) AFT L- EPSU SELF TEST SHOWS EXTERIOR LIGHT FAIL. SWAPPED 13WL WITH 17WL, FAULT DOES NOT FOLLOW.  PERFORMED TSM 25-62-00-810-819-A.  CONTINUED AT TSM 25-62-00-810-819-A STEP 4.C. CHECKED ACFT WIRING FROM EPSU (13WL) TO LT ESCAPE SLIDE/RAFT CONNECTOR 2873VC IAW ASM 33-51-02.  WHEN CHECKING FOR SHORT TO GROUND FROM PIN A OF 2873VC, FOUND RESISTANCE OF 3 TO 9. MEGAOHMS. WHEN AC POWER TURNED OFF, RESISTANCE DISAPPEARS. SUSPECT RESISTANCE IS BEING INDUCED & ISSUE IS WITH THE SLIDE AND NOT WITH WIRING. USED DIODE TEST FUNCTION OF METER  AND NEW SLIDE. THEY MEASURED 1.51, 1.53 AND 1.57 VDC. SLAVED IN A NEW SLIDE ON L2 DOOR, RAN EPSU BITE IAW AMM 33-51-00-710-006-A., NO HELP. CHECKED WIRING FROM EPSU (13WL) PIN F TO RT ESCAPE SLIDE LIGHT INSTALLED LT & RT SLIDE ASSY IAW AMM 25-62-44-400-007-A,25-62-44-400-803-A. PERFORMED EPSU BITE TEST IAW AMM 33-51-00-710-001-A.OPS CHKD GOOD.

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