# AD 48-03-05: Hydraulic Lines

- 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- Superseded by: Nothing supersedes this AD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/23ECCC5B6493340D862569A700699D28.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-03-05

## The airworthiness directive

48-03-05 CURTISS-WRIGHT Applies to all C-46 Series aircraft.

Compliance required by March 1, 1948.

To eliminate hydraulic leaks which can cause a fire, hydraulic tube P/N 20-575-1116-64 located at fuselage Station 50.5 between the brake accumulator and brake metering valve, should be inspected for evidence of chafing on tube assembly tension arm P/N 20-530-1130-1. If insufficient clearance exists, the hydraulic lines must be rerouted and damaged lines 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/48-03-05/models.md
Every aircraft: https://openairdocs.org/ad/48-03-05/aircraft.md

Its text cites no advisory circulars or STCs.

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