53-21-02: Horizontal Stabilizer Strut
FAA order 53-21-02 is an airworthiness directive. The FAA's subject line: Horizontal Stabilizer Strut. It names Grumman G-21: about 35 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: landing gear.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Grumman American Aviation Corporation
- Models
- G-21A (Army OA-9, Navy JRF-1, -2, -3, -4, -5, and -6B)
- On this site
- Grumman G-21 35 registered
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (746 characters)
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.)
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/53-21-02.json · aircraft systems.