# AD 78-17-01: Emergency Locator Transmitter

- Type: Airworthiness directive
- Status: Current
- Products: Mooney M20C, M20F and M20J
- Effective: August 21, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3279
- Registered aircraft: 3,401 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/67E0A75BE4CC4D3486256A3B007142E4.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-17-01

## The airworthiness directive

78-17-01 MOONEY AIRCRAFT CORPORATION: Amendment 39-3279. Applies to Model M20C, Serial Number 20-1186 through 20-1258, M20F, Serial Number 22-1306 through 22-1486, and M20J, Serial Number 24-0001 through 24-0454 airplanes, with Pacific Communications, Inc., Aircraft Products Division, Model Alert 50, Part No. 01070-5 emergency locator transmitter system installed. Compliance is required as indicated. To assure that the emergency locator transmitter will radiate a proper signal when activated during emergency conditions, accomplish the following: 1. Rework the aircraft skin in accordance with Mooney Aircraft Corporation Service Bulletin M20-213 dated July 21, 1978, within ten hours operating time but no later than 30 days from the effective date of this AD. 2. Upon completion of the Mooney Service Bulletin No. 20-213 instructions, measure the resistance between the antenna and the aircraft skin using an appropriate meter and assure that a reading of 9,000 to 13,000 ohms isobtained. Determine that the ELT transmits properly by testing it in accordance with FAA Advisory Circular No's. 91-44 or 20-81. 3. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Mooney Aircraft Corporation, P. O. Box 72, Kerrville, Texas 78028. These documents may also be examined at Southwest Regional Office, Regional Counsel, Building 3B, Room 100, 4400 Blue Mound Road, Fort Worth, Texas, and at FAA headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its headquarters in Washington, D.C., and at Southwest Regional Office in Fort Worth, Texas. This amendment becomes effective August 21, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A3](https://openairdocs.org/tcds/2A3): Mooney International Corporation; names 3 of 17 models: M20F, M20C, M20J

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 3,401 (3,401 by airframe model, 0 by engine model)
- Makers: Mooney 3,387, Aerostar Acft Corp Of Texas 14

Models with the most aircraft:

- [Mooney M20J](https://openairdocs.org/model/mooney-m20j): 1,408 aircraft (airframe model)
- [Mooney M20C](https://openairdocs.org/model/mooney-m20c): 1,258 aircraft (airframe model)
- [Mooney M20F](https://openairdocs.org/model/mooney-m20f): 721 aircraft (airframe model)
- [Aerostar Acft Corp Of Texas M20F](https://openairdocs.org/model/aerostar-acft-corp-of-texas-m20f): 8 aircraft (airframe model)
- [Aerostar Acft Corp Of Texas M20C](https://openairdocs.org/model/aerostar-acft-corp-of-texas-m20c): 6 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/78-17-01/models.md
Every aircraft: https://openairdocs.org/ad/78-17-01/aircraft.md

Its text cites no advisory circulars or STCs.

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