# AD 47-21-19: Control Clamps or Brass Ferrules

- Type: Airworthiness directive
- Status: Current
- Products: Sky Enterprises RC-3
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 126 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A9C0343F2B1CCE0D86256A56006668D6.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-21-19

## The airworthiness directive

47-21-19 REPUBLIC: (Was Mandatory Note 9 of AD-769-2.) Applies to Model RC-3 Aircraft Serial Numbers 5 to 238, Inclusive.

Compliance required not later than the next 25 hours of operation subsequent to July 1, 1947, but in no case later than September 1, 1947.

Inspect parking brake, battery, mixture and carburetor heat flexible controls for presence of brass ferrule or AN 742D3 clamp on split sleeve at operating end of these controls. If clamp or ferrule is not installed, split metal sleeve can open permitting casing to slide out when control is actuated thus rendering the control ineffective. The above clamp should be installed immediately.

(Seabee Service News No. 10, dated January 13, 1947, covers this subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-769](https://openairdocs.org/tcds/A-769): Sky Enterprises Inc.; names 1 of 1 models: RC-3

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 126 (126 by airframe model, 0 by engine model)
- Makers: Republic 122, Downer 2, Republic Aviation Corp USA 1, Simuflight Seattle-1-Stol 1

Models with the most aircraft:

- [Republic RC-3](https://openairdocs.org/model/republic-rc-3): 122 aircraft (airframe model)
- [Downer RC-3](https://openairdocs.org/model/downer-rc-3): 2 aircraft (airframe model)
- [Republic Aviation Corp USA SEABEE RC-3](https://openairdocs.org/model/republic-aviation-corp-usa-seabee-rc-3): 1 aircraft (airframe model)
- [Simuflight Seattle-1-Stol RC-3](https://openairdocs.org/model/simuflight-seattle-1-stol-rc-3): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/47-21-19/models.md
Every aircraft: https://openairdocs.org/ad/47-21-19/aircraft.md

Its text cites no advisory circulars or STCs.

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