# SDR 2A6R2026031675004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2026
- Submitted: March 16, 2026
- Operation: General aviation
- Filed by: [Air Methods, LLC, repair station 2A6R933B](https://openairdocs.org/faa-repair-station/2A6R933B/air-methods-llc.md) (OpenAirDocs)
- Aircraft: [N135LC](https://openairdocs.org/aircraft/N135LC), registered now
- Make and model: Urocop EC135T2
- Registry model: [Urocop EC135T2](https://openairdocs.org/model/eurocopter-deutschland-ec135t2) (OpenAirDocs)
- Aircraft serial: 0296
- Aircraft time: 9,749 hours, 33,760 cycles
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Ehsi
- Part number: 80620543
- Part serial: 2019
- Condition: Wrong Part
- Location: Zone 100
- Part time: 9,749 hours, 33,760 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2A6R2026031675004

## Discrepancy

DURING REINSTALLATION OF THE EHSI (ELECTRONIC HORIZONTAL SITUATION INDICATOR), THE INSTALLING TECHNICIAN NOTED THAT THE LOCKING TEETH RETAINER ON THE UNIT'S J3 CONNECTOR WOULD NOT LOCK AS EXPECTED WHEN CONNECTING THE AIRFRAME P3 D-SUB CONNECTOR. IT WAS ALSO NOTED THAT ANOTHER EC135 (S/N: 0351) UNDERGOING MAINTENANCE AT OUR FACILITY WITH THE SAME EHSI INSTALLATION HAD THE SAME ISSUE WITH THE LOCKING TEETH RETAINER ON THE UNIT. IT WAS THEN SUSPECTED THAT THIS MAY BE A MANUFACTURER'S ISSUE. THE AIRFRAME P3 CONNECTORS WERE CONFIRMED TO BE THE CORRECT P/N (RD50M10JVLX) PER HONEYWELL KI-825 INSTALL MANUAL TECH PUB IM 006-10715-0000 SECTION 2.3.2 FIGURE 2-2 AND SECTION 2.3.3 TABLE 2-1A. IT WAS ALSO CONFIRMED PER POSITRONIC DATA SHEET DOC# M1016 REV B1 THAT THE INCORRECT LOCKING TEETH RETAINER P/N (D9/370000V30) WAS INSTALLED, INSTEAD OF THE CORRECT P/N (D500000V30). AFTER COMMUNICATION AND INVESTIGATION WITH THE ONTIC, THE CURRENT LICENSE HOLDER FOR THE KI-825, IT WAS FOUND THAT ONTIC HAD INSTALLED LOCKING TEETH RETAINERS ON THE KI-825 UNITS FOR A 37-PIN CONNECTOR, RATHER THAN THE 50-PIN CONNECTOR THAT IS USED IN THE KI-825 INSTALL AND THAT ONTIC'S ENTIRE STOCK OF KI-825S HAD THE SAME INCORRECT LOCKING TEETH RETAINERS INSTALLED. THE INCORRECT P/N RETAINER WAS REMOVED & REPLACED WITH THE CORRECT P/N RETAINER IAW AC43.13-1B, AND NO ISSUES WITH THE LOCKING FEATURE WERE NOTED. THE LOCAL FSDO PAI/PMI WAS CONTACTED REGARDING THIS MATTER, AND THEY WERE SATISFIED WITH THE CORRECTIVE ACTION.

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