# AD 53-19-01: Generator Cooling Fan

- Type: Airworthiness directive
- Status: Current
- Products: Boeing C54-DC and DC-4
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5CF08D985FCF98F1862569BC006408E7.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/53-19-01

## The airworthiness directive

53-19-01 DOUGLAS: Applies to All DC-4 and C54-DC Series Aircraft Utilizing Eclipse-Pioneer Type 901 Generators.

To be accomplished by the next engine overhaul, but not later than April 1, 1954.

In view of the fire hazard existing in the use of the magnesium cooling fan in the Eclipse Type 901 generator in the DC-4 and C-54 Series aircraft installations, the magnesium fan as a unit must be removed and Eclipse-Pioneer spacer P/N 866570 installed in its place.

(Eclipse-Pioneer Service Bulletin No. 505 covers the above 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 2 of 7 models: DC-4, C54-DC

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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