- Models
- AT-6 (SNJ-2), AT-6A (SNJ-3), AT-6B, AT-6C (SNJ-4), BC-1A
- Data sheet
- TCDSA-2-575
- Registered aircraft
- 107 matched by model
- Product
- Aircraft · Small airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | a5affa67…7b8c261 | FAA DRS (API key needed) |
On this page
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 TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 107
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1938 | 1 |
|---|---|
| 1940 | 2 |
| 1941 | 11 |
| 1942 | 15 |
| 1943 | 15 |
| 1944 | 5 |
| 1945 | 2 |
| 1946 | 1 |
| 1956 | 5 |
| 1957 | 3 |
| 1958 | 3 |
| 1960 | 1 |
| 1961 | 2 |
| 1975 | 1 |
40 with no year recorded