# AD 74-18-03: Main Landing Gear Axle Elbow

- 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
- Effective: August 30, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1937
- Registered aircraft: 7 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6AAEB71C02B533CF862569A8006EF037.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-18-03

## The airworthiness directive

74-18-03 CURTISS-WRIGHT: Amendment 39-1937. Applies to all Model C-46 Series airplanes certificated in all categories.

To prevent failures of the main landing gear axle elbows, Part Number 8107-63L and 8107-63R, accomplish the following, unless already accomplished:

  (a) For aircraft having main landing gear axle elbows with less than 7800 hours' time in service on the effective date of this AD, at 8,000 hours' time in service and thereafter, at intervals not to exceed 500 hours' time in service, inspect the part numbers 8107-63L and -63R elbows for cracks visually with a ten power or higher glass or in an equivalent FAA approved manner.

  (b) For aircraft having main landing gear axle elbows with more than 7800 hours' time in service on the effective date of this AD, within 200 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 500 hours' time in service, inspect the Part Numbers 8107-63L and -63R elbows for cracks visually with a ten power or higher glass or in an equivalent FAA approved manner.

  (c) Replace cracked elbows with serviceable parts before further flight.

  (d) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Southern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator.

This amendment becomes effective August 30, 1974.

## 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/74-18-03/models.md
Every aircraft: https://openairdocs.org/ad/74-18-03/aircraft.md

Its text cites no advisory circulars or STCs.

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