# AD 78-20-09: Fuel Selector Valves

- Type: Airworthiness directive
- Status: Current
- Products: SOCATA - Groupe Aerospatiale GA-7
- Effective: October 9, 1978
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3309
- Registered aircraft: 44 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F0CBDA3E81B22E2E86256A38005E8808.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/78-20-09

## The airworthiness directive

78-20-09 GULFSTREAM AMERICAN CORPORATION (GAC) (FORMERLY GRUMMAN AMERICAN AVIATION CORPORATION (GAAC): Amendment 39-3309. Applies to Model GA-7 serial numbers GA7-001 through GA7-0039.

Compliance is required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent a hazard to the airplane caused by excessive force required to move the fuel selector valve from one position to another position, accomplish the following:

  (1) Remove the two original fuel selector valves, Gerdes Part Number A980-5, and install two new improved fuel selector valves, Gerdes Part Number A980-7, utilizing the procedures and precautions contained in GA-7 Maintenance Manual, Section 28-2-1, pages 202 and 204, Fuel Selector Valve Removal, and Fuel Selector Valve Installations.

  (2) After the Gerdes Part Number A980-7 fuel selector valve installation has been completed in accordance with the above Maintenance Manual procedures, set each selector to ON, OFF, and CROSSFEED positions while observing each selector valve to ensure that the valve operates correctly, no fuel leakage occurs, and a positive detent is noted at each position selected on the valve.

(Gulfstream American Service Bulletin No. ME-10 dated August 16, 1978 applies to this same subject.) This amendment becomes effective October 9, 1978.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A17SO](https://openairdocs.org/tcds/A17SO): Cougar Aircraft Corporation; names 1 of 1 models: GA-7

## 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: 44 (44 by airframe model, 0 by engine model)
- Makers: Grumman American Avn. 43, Gulfstream American 1

Models with the most aircraft:

- [Grumman American Avn. GA-7](https://openairdocs.org/model/grumman-american-avn-ga-7): 43 aircraft (airframe model)
- [Gulfstream American GA-7](https://openairdocs.org/model/gulfstream-american-ga-7): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/78-20-09/models.md
Every aircraft: https://openairdocs.org/ad/78-20-09/aircraft.md

Its text cites no advisory circulars or STCs.

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