- Models
- C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
- Data sheet
- TCDSA-762
- Registered aircraft
- 4 matched by model
- Product
- Aircraft · Large airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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|---|---|---|---|
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On this page
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 TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 4
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.