# AD 72-11-03: Engine Fuel Starvation

- Type: Airworthiness directive
- Status: Current
- Products: Grumman American G-21 and G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B)
- Effective: May 30, 1972
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1451
- Registered aircraft: 35 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C5D47C14E752C2F686256A38005B68F7.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/72-11-03

## The airworthiness directive

72-11-03 GRUMMAN AIRCRAFT: Amdt. 39-1451. Applies to G-21 and G-21A airplanes (converted military OA-9 and JRF series airplanes under TC 654) certificated in all categories.

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

In order to prevent engine fuel starvation due to fuel vaporization within fuel feed lines to the engines, accomplish the following:

Install a permanent placard on or near the instrument panel in full view of the pilot using minimum 1/8 inch lettering to read:

"Cross feed valve must be closed during all flight operations except for emergencies resulting from engine pump failure."

(Grumman Customer Bulletin No. G21A 72-1 pertains to this subject) This amendment is effective May 30, 1972.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS TC 654](https://openairdocs.org/tcds/TC%20654): Frakes Aviation; names 2 of 2 models: G-21, G-21A (Army OA-9; Navy JRF-1; -2; -3; -4; -5; and -6B)

## 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: 35 (35 by airframe model, 0 by engine model)
- Makers: Grumman 35

Models with the most aircraft:

- [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a): 34 aircraft (airframe model)
- [Grumman G-21](https://openairdocs.org/model/grumman-g-21): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/72-11-03/models.md
Every aircraft: https://openairdocs.org/ad/72-11-03/aircraft.md

Its text cites no advisory circulars or STCs.

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