- Effective
- May 30, 1972
- Models
- G-21, G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B)
- Data sheet
- TCDSTC 654
- Registered aircraft
- 35 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-1451
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 | 9d0e076e…b04d41b | FAA DRS (API key needed) |
On this page
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 TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 35
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 | 4 |
| 1945 | 2 |
| 1946 | 5 |
| 1947 | 1 |
| 1951 | 1 |
| 1956 | 1 |
| 1958 | 1 |
| 1959 | 1 |
| 1962 | 1 |
7 with no year recorded