- 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 | 19 KB | 1d3619f8…18e3889 | FAA DRS (API key needed) |
On this page
The airworthiness directive
53-21-02 GRUMMAN: Applies to All Model G-21A (Converted OA-9, JRF-1 Through JRF-5 and JRF-6B) Aircraft.
Compliance required as indicated.
1. Inspect the threaded portion of the horizontal stabilizer strut lower adjustable end fitting P/N 12561-3, by a magnetic particle inspection method, as soon as practicable, but not later than November 15, 1953, and at 1,000-hour intervals thereafter. Replace fitting if crack is found.
2. Replace these fittings every 3,200 hours. If 3,200 hours is reached before the first inspection, fittings may be used for 50 hours after this inspection provided no cracks are found.
(Grumman Aircraft Engineering Corp. Customer Bulletin G-21A No. 3, dated March 20, 1953, covers this same subject.)
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