# AD 47-02-03: Accumulator

- Type: Airworthiness directive
- Status: Current
- Products: Boeing C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC and DC-4
- Effective: March 27, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3720
- Registered aircraft: 4 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7F8B461C7D1FCD3086256CC4006A48D8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-02-03

## The airworthiness directive

47-02-03 MCDONNELL DOUGLAS: Amendment 39-3720. (Was Mandatory Note 11 of AD-762-7.) Applies to C-54 and DC-4 Aircraft.

To be accomplished not later than August 1, 1947.

Because of failures in service of the main 9" Douglas aluminum accumulator, it is necessary to replace it with at least one 7 1/2" steel accumulator, Bendix P/N 406920 or Vickers P/N AA14308B, or Vickers 10" accumulator Model AA-14310.

(Douglas Service Bulletin DC-4 No. 9 and Addendum dated January 6, 1956 cover the same subject.)

This Amendment 39-3720 becomes effective March 27, 1980.

## 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/47-02-03/models.md
Every aircraft: https://openairdocs.org/ad/47-02-03/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.