# AD 48-44-01: Nose Gear Orifice Fitting

- Type: Airworthiness directive
- Status: Current
- Products: Boeing C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC and DC-4
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4D6A71113F7C9A5D862569BC005A9AFF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-44-01

## The airworthiness directive

48-44-01 DOUGLAS: Applies to All C-54 and DC-4 Series Aircraft.

To be accomplished not later than March 1, 1949.

In order to preclude nose gear retractions malfunction due to particles of disintegrated packing clogging the present upline orifice fitting, it is necessary to install an orifice fitting having a floating pin in the orifice hole and to replace the present packing used on the retracting cylinder with a more satisfactory packing. To accomplish this change:

1. Replace the present upline orifice fitting with a union fitting and rework the existing tee fitting to include an orifice fitting (0.063-inch diameter floating pin in 0.090-inch diameter orifice hole) in the pipe threaded end.

2. (a) Replace the existing chevron packing on the nose gear piston assembly with two synthetic chevron packings and two leather chevrons. Install two dural packing rings on each respective end of the piston head.

  (b) Replace existing packing on the nose gear cylinder end assembly with one dural packing ring, three synthetic chevron packings, and one leather chevron packing.

  (c) Install two new washers over the end of the cylinder barrel.

(Douglas Service Bulletin DC-4 No. 78 dated May 4, 1948 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-762](https://openairdocs.org/tcds/A-762): The Boeing Company; names 7 of 7 models: C54E-DC, C54G-DC, C54B-DC, DC-4, C54A-DC, C54D-DC, C54-DC

## 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: 4 (4 by airframe model, 0 by engine model)
- Makers: Douglas 4

Models with the most aircraft:

- [Douglas C54D-DC](https://openairdocs.org/model/douglas-c54d-dc): 2 aircraft (airframe model)
- [Douglas C54E-DC](https://openairdocs.org/model/douglas-c54e-dc): 1 aircraft (airframe model)
- [Douglas C54G-DC](https://openairdocs.org/model/douglas-c54g-dc): 1 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/48-44-01/models.md
Every aircraft: https://openairdocs.org/ad/48-44-01/aircraft.md

Its text cites no advisory circulars or STCs.

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