AD 47-02-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54-DC Series Airplanes and all DC-4's |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model C-54-DC Series Airplanes and all DC-4's |
Unsafe Condition
The hydraulic hand pump shutoff valve may allow unintended fluid leakage, leading to inadequate hydraulic pressure for critical systems such as brakes, cowl flaps, nose wheel steering, windshield wiper, landing gear, wing flaps, and main accumulator.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework the hydraulic hand pump shutoff valve by replacing the valve retainer, spring, plunger with a sleeve and new packings. Remove existing part numbers 5241991 and 4242103, restamp with part numbers 2343816-4 and 2343816-6. Modify the placard at the control to specify system functions for forward and rear positions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas Model C-54-DC Series airplanes incorporating brake pressure accumulators and all DC-4's up to serial number 43065.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Hydraulic Hand Pump Shutoff Valve
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-02-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-02-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54-DC Series Airplanes and all DC-4's Subject: Hydraulic Hand Pump Shutoff Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-02-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-02-06 SUBJECT HEADING: DOUGLAS Model C-54-DC Series Airplanes and all DC-4's ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-02-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-02-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54-DC Series Airplanes and all DC-4's Subject: Hydraulic Hand Pump Shutoff Valve Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-02-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-02-06 SUBJECT HEADING: DOUGLAS Model C-54-DC Series Airplanes and all DC-4's ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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