# SDR 2A6R2026040175301

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2026
- Submitted: April 1, 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: [N917AC](https://openairdocs.org/aircraft/N917AC), registered now
- Make and model: Urocop EC 135 P2
- Registry model: [Urocop EC 135 P2](https://openairdocs.org/model/eurocopter-deutschland-ec-135-p2) (OpenAirDocs)
- Aircraft serial: 0351
- Aircraft time: 9,472 hours, 47,358 cycles
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Antenna
- Part number: CI2922
- Part serial: 399474
- Condition: Wrong Part
- Location: Zone 200
- Part time: 9,472 hours, 47,358 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/2A6R2026040175301

## Discrepancy

THE TECHNISONIC TDFM 9100 MULTI-BAND TRANSCEIVER AND RC-9100 REMOTE CONTROLLER SYSTEM WERE INSTALLED ON THIS ACFT UTILIZING THE CERTWORKS STC SR01052DE. PER THE 337, THE EXISTING CI 177-1 VHF ANTENNA FROM THE TDFM 6158 INSTALL WAS RETAINED FOR USE WITH THE TDFM 9100 SYS. AT SOME POINT, THE CI 177-1 ANTENNA WAS REMOVED BY UNKNOWN PERSONS AND A CI 292-2 WAS INSTALLED IN ITS PLACE. IT WAS NOTED THAT THE CI 292-2 ANTENNA IS NOT SUPPORTED FOR THE VHF FREQUENCY RANGE REQUIRED FOR THE TDFM-9100 SYS, BUT A CI 292-3 IS CALLED OUT FOR IN STC SR01052DE DRAWING CW0620-1096 REV IR AND WOULD SUPPORT THE PROPER VHF FREQUENCY RANGE OF 138-174 MHZ. A CONFORMITY 337 HAS BEEN CREATED TO CONFORM AND DOCUMENT THE INSTALLATION OF A CI 292-3 ANTENNA TO THE CERTWORKS STC SR01052DE DRAWING CW0620-1096 REV IR FOR THE TDFM 9100 INSTALLATION ON AN EC135 AS WELL AS AIR METHODS WIRING DIAGRAM “EC135 TDFM 9100 WIRING DIAGRAM”, DRAWING SE233-0248-0351 REV -.

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