# AD 47-02-06: Hydraulic Hand Pump Shutoff Valve

- 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- Superseded by: Nothing supersedes this AD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/4C2AE2660582E9BC86256833006CE97A.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-02-06

## The airworthiness directive

47-02-06 DOUGLAS: (Was Service Note 3 of AD-762-7.) Applies to C-54-DC Series Airplanes Incorporating Brake Pressure Accumulators and All DC-4's up to Serial Number 43065.

Rework the hydraulic hand pump shutoff valve 5241991 by replacing the valve retainer, spring and plunger with a sleeve and new type packings. The existing P/N 5241991 and 4242103 are to be removed and Nos. 2343816-4 and 2343816-6 restamped on the valve assembly and valve body, respectively. Also, change placard at the hand pump shutoff valve control to read "brakes, cowl flaps, nose wheel steering and windshield wiper" in the forward position and "landing gear, wing flaps, and main accumulator" in the rear position.

(Douglas Service Bulletin DC-4 No. 3, 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 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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