47-21-17: Backfire Screen
FAA order 47-21-17 is an airworthiness directive. The FAA's subject line: Backfire Screen. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Sky Enterprises, Inc.
- Models
- RC-3
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 (617 characters)
47-21-17 REPUBLIC: (Was Mandatory Note 7 of AD-769-2.) Applies to Model RC-3 Aircraft Serial Numbers 5 to 125, Inclusive.
To be accomplished not later than the next 25 hours of operation subsequent to July 1, 1947, and in any case not later than September 1, 1947.
In order to provide an improved backfire screen, remove existing screen from flexible hot air tube, install new type screen with flush end locating it to prevent interference with the carburetor air duct or the old screen which will be reinstalled. Securely attach new screen to tube.
(Republic Seabee Bulletin No. 2 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/47-21-17.json · aircraft systems.