- Model
- G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B)
- Data sheet
- TCDSTC 654
- Registered aircraft
- 34 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 | 76884ba2…7dcd9f2 | FAA DRS (API key needed) |
On this page
The airworthiness directive
50-15-01 GRUMMAN: Applies to All Model G-21A Aircraft (Converted JRF-5, JRF- 6B) Equipped With Reverse Direction Mixture Controls.
Compliance required not later than next 25-hour inspection.
To conform with conventional mixture control operation ("forward" for full rich position) on aircraft equipped with Bendix NAR9B carburetors with manual mixture control, rotate the position of the mixture bellcranks 180 degrees on the carburetors and reverse the tooth segments on the cockpit control end for end. Revise the cockpit control placard accordingly.
On aircraft equipped with Bendix NAR9C2 carburetors with automatic mixture control, the cockpit quadrant is already arranged in the correct sense and requires no revision. It should be noted that an additional Manual Lean position is provided forward of Full Rich and caution must be exercised to prevent inadvertently positioning the control incorrectly if the Manual Lean sector of the quadrant is retained.
This supersedes AD 48-14-02.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 34
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1939 | 2 |
|---|---|
| 1940 | 1 |
| 1942 | 4 |
| 1943 | 4 |
| 1944 | 3 |
| 1945 | 2 |
| 1946 | 5 |
| 1947 | 1 |
| 1951 | 1 |
| 1956 | 1 |
| 1958 | 1 |
| 1959 | 1 |
| 1962 | 1 |
7 with no year recorded