# AD 58-20-01: Tail Wheel Retract Yoke

- Type: Airworthiness directive
- Status: Current
- Products: Airlift International C-46A, C-46D, C-46F, C-46R, C-46E, C-46A, C-46D, C-46E, C-46F, C-46A, C-46D, C-46F and 3 more
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A79524B6CB9F80CA862569A700753C95.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/58-20-01

## The airworthiness directive

58-20-01 CURTISS-WRIGHT: Applies to all C-46 Series aircraft P/N 20-360-1058-2 (Tail Wheel Retract Yoke).

Compliance required at next regular inspection, but not later than December 1, 1958.

Several P/N 20-360-1058-2 tail wheel retract yokes have been found cracked or broken. Many of these parts have had a radius at the base of the yoke of less than the required 0.120 inch.

As a result of these failures, the subject parts must be inspected for the proper radius and magnetic particle, or equivalent inspection for cracks at the base of the yoke.

Parts which have a radius at the base of the yoke of less than 0.110 inch or in which cracks are found, are considered unairworthy and must be replaced.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A5](https://openairdocs.org/tcds/2A5): Tempo Design Corporation; names 2 of 2 models: C-46/CW20-T, Super C-46/CW20-T
- [TCDS 3A2](https://openairdocs.org/tcds/3A2): Airlift International Inc.; names 1 of 4 models: C-46R

## 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: 7 (7 by airframe model, 0 by engine model)
- Makers: Curtiss Wright 7

Models with the most aircraft:

- [Curtiss Wright C-46F](https://openairdocs.org/model/curtiss-wright-c-46f): 4 aircraft (airframe model)
- [Curtiss Wright C-46A](https://openairdocs.org/model/curtiss-wright-c-46a): 1 aircraft (airframe model)
- [Curtiss Wright C-46D](https://openairdocs.org/model/curtiss-wright-c-46d): 1 aircraft (airframe model)
- [Curtiss Wright C-46R](https://openairdocs.org/model/curtiss-wright-c-46r): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/58-20-01/models.md
Every aircraft: https://openairdocs.org/ad/58-20-01/aircraft.md

Its text cites no advisory circulars or STCs.

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