# AD 49-07-02: Fuel System Placard

- Type: Airworthiness directive
- Status: Current
- Products: Boeing AT-6 (SNJ-2), AT-6A (SNJ-3), AT-6B, AT-6C (SNJ-4) and BC-1A
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 107 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CDF9F1784ABF37AE86256A450068ACF6.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/49-07-02

## The airworthiness directive

49-07-02 NORTH AMERICAN: Applies to Army BC-1A, AT-6, -6A, -6B, -6C: Navy SNJ-2, -3, -4 Aircraft.

Compliance required not later than April 1, 1949.

Accidents have occurred in the above model aircraft from engine stoppage on takeoffs and landings when operating on the left tank standpipe outlet with the fuel in the tank down to the level of the standpipe.

Such engine stoppages have occurred because pilots not fully familiar with the fuel system have misinterpreted the left tank fuel gage as indicating total available fuel quantity with selector valve on the Left Hand Main (standpipe) position, unaware that the change to Reserve or Right Hand Main position must be made before the fuel level in the left tank drops to 20 gallons.

To preclude the possibility of pilot error with regard to the foregoing, the following placard shall be installed in each cockpit:

"CAUTION: Unless Left Tank is full, use Reserve or Right Tank for Takeoff and Landing."

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-2-575](https://openairdocs.org/tcds/A-2-575): The Boeing Company; names 5 of 9 models: AT-6A (SNJ-3), BC-1A, AT-6C (SNJ-4), AT-6 (SNJ-2), AT-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: 107 (107 by airframe model, 0 by engine model)
- Makers: North American 82, North American/Victoria MNT LT 20, North American / Crosser G 1, North American-Collins 1, North American/Case M V JR 1, North American/Levrett 1, North American/Walker/Screws 1

Models with the most aircraft:

- [North American AT-6C](https://openairdocs.org/model/north-american-at-6c): 43 aircraft (airframe model)
- [North American AT-6](https://openairdocs.org/model/north-american-at-6): 28 aircraft (airframe model)
- [North American/Victoria MNT LT AT-6A](https://openairdocs.org/model/north-american-victoria-mnt-lt-at-6a): 20 aircraft (airframe model)
- [North American AT-6A](https://openairdocs.org/model/north-american-at-6a): 5 aircraft (airframe model)
- [North American AT-6B](https://openairdocs.org/model/north-american-at-6b): 3 aircraft (airframe model)
- [North American AT-6C(SNJ-4)](https://openairdocs.org/model/north-american-at-6c-snj-4): 3 aircraft (airframe model)
- [North American-Collins AT-6A](https://openairdocs.org/model/north-american-collins-at-6a): 1 aircraft (airframe model)
- [North American/Walker/Screws AT6C](https://openairdocs.org/model/north-american-walker-screws-at6c): 1 aircraft (airframe model)
- [North American / Crosser G AT6A](https://openairdocs.org/model/north-american-crosser-g-at6a): 1 aircraft (airframe model)
- [North American/Levrett AT6-C](https://openairdocs.org/model/north-american-levrett-at6-c): 1 aircraft (airframe model)
- [North American/Case M V JR AT-6](https://openairdocs.org/model/north-american-case-m-v-jr-at-6): 1 aircraft (airframe model)

All 12 models: https://openairdocs.org/ad/49-07-02/models.md
Every aircraft: https://openairdocs.org/ad/49-07-02/aircraft.md

Its text cites no advisory circulars or STCs.

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