AD 46-39-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54 Series Aircraft |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54 Series Aircraft |
Unsafe Condition
Valve freezing due to ice forming in the detent chamber of fuel tank selector and crossfeed valves.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework Parker and Hydro Aire valves by filling the detent chamber with Dow Corning compound No. 4 and installing a washer to retain the compound and act as a water shield.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than November 15, 1946
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas Model C-54 Series Aircraft including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Tank Selector and Crossfeed Valves
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_46-39-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-39-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54 Series Aircraft Subject: Fuel Tank Selector and Crossfeed Valves Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 46-39-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-39-04 SUBJECT HEADING: DOUGLAS Model C-54 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-39-04 DOUGLAS: (Was Mandatory Note 7 of AD-762-7.) Applies to C-54 Series Aircraft. To be accomplished not later than November 15, 1946. Instances of valve freezing, due to ice forming in the detent chamber, have been reported on fuel tank selector and crossfeed valves. To prevent valve freezing, the Parker and Hydro Aire valves must be reworked by filling the detent chamber with Dow Corning compound No. 4 and installing a washer to retain the compound and to act as a water shield. (Douglas Drawings 4331597 and 2331524 cover this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_46-39-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-39-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54 Series Aircraft Subject: Fuel Tank Selector and Crossfeed Valves Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC 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: 46-39-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-39-04 SUBJECT HEADING: DOUGLAS Model C-54 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-39-04 DOUGLAS: (Was Mandatory Note 7 of AD-762-7.) Applies to C-54 Series Aircraft. To be accomplished not later than November 15, 1946. Instances of valve freezing, due to ice forming in the detent chamber, have been reported on fuel tank selector and crossfeed valves. To prevent valve freezing, the Parker and Hydro Aire valves must be reworked by filling the detent chamber with Dow Corning compound No. 4 and installing a washer to retain the compound and to act as a water shield. (Douglas Drawings 4331597 and 2331524 cover this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...
2011-12-01
final ruleAirworthiness Directives; Koito Industries, Ltd., Seats and Seating Systems Approved Under Technical Standard Order (TSO) TSO-C39b, TSO-C39c, or TSO-C127a
Unsafe Condition: Seats and seating systems may not meet certain flammability, static strength, and dynamic strength criteria. Failure to meet static and dynamic strength criteria could result in injuries during eme...
93-14-12
final ruleAirworthiness Directives; ESSEX PB&R CORPORATION (formerly E.I. DuPont de Nemours and Company \\nIncorporated) PELS Model 4566M37B Crewmember Protective Breathing Equipment (PBE) Units
Unsafe Condition: Leakage of the PBE neck seal could compromise the crew's ability to combat an aircraft fire.
85-23-04
final ruleAirworthiness Directives; McDONNELL DOUGLAS DC-4 and C54-DC Series, and all C54 Military
Unsafe Condition: Loss of the elevator trim tab control in flight due to cracks in the left-hand and right-hand elevator trim tab spars at station 81.5.
