# AD 74-11-05: Fire Extinguisher Circuits

- Type: Airworthiness directive
- Status: Current
- Products: Gulfstream Aerospace G-1159
- Effective: May 24, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1849
- Registered aircraft: 14 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DE1FC4DD793D4762862569B500722312.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-11-05

## The airworthiness directive

74-11-05 GRUMMAN AMERICAN AVIATION CORPORATION: Amendment 39- 1849. Applies to Grumman G-1159, Serial Number 1 through 110 and 775 except 91 and 95, certificated in all categories.

Compliance required within the next 100 hours time in service after the effective date of this AD, unless already accomplished.

To provide dual electrical fire extinguisher squib circuits, accomplish the following or an equivalent rework approved by the Chief, Engineering and Manufacturing Branch, Southern Region.

Remove the left and right fire extinguisher switches MS24523-21 and install MS24524- 21 switches in their place.

Wire switches in accordance with Grumman Gulfstream II Aircraft Service Change 121.

Replace pilot's circuit breaker panel nameplate 1159AV2042 with nameplate 1159SB20082-11.

This rework is outlined in detail in the Grumman Gulfstream II Aircraft Service Change 121.

This amendment is effective May 24, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A12EA](https://openairdocs.org/tcds/A12EA): Gulfstream Aerospace Corporation; names 1 of 7 models: G-1159

## 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: 14 (14 by airframe model, 0 by engine model)
- Makers: Grumman 8, Grumman American Avn. 4, Gulfstream American 2

Models with the most aircraft:

- [Grumman G-1159](https://openairdocs.org/model/grumman-g-1159): 8 aircraft (airframe model)
- [Grumman American Avn. G-1159](https://openairdocs.org/model/grumman-american-avn-g-1159): 4 aircraft (airframe model)
- [Gulfstream American G-1159](https://openairdocs.org/model/gulfstream-american-g-1159): 2 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/74-11-05/models.md
Every aircraft: https://openairdocs.org/ad/74-11-05/aircraft.md

Its text cites no advisory circulars or STCs.

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