AD 55-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
Unsafe Condition
Propeller feathering lines forward of the firewall in zone 2 may fail due to fire exposure, compromising the integrity of the propeller feathering system during a powerplant fire.
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Required Actions
Replace existing propeller feathering lines forward of the firewall in zone 2 with fireproof/fire resistant lines and hose assemblies per Aeroquip Drawings 304005-10S-46 and Douglas P/N 3500614-2. Install Aeroquip 304 protective sleeves or acceptable alternatives as specified.
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Compliance Time
By first scheduled engine change after November 1, 1955, but not later than November 1, 1956.
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Affected Aircraft
Douglas DC-7, DC-7B, DC-7C aircraft with serial numbers below 486 equipped with Hamilton Standard propellers.
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Federal Register Abstract
Propeller Feathering Lines
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_55-15-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-15-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-7 Aircraft Subject: Propeller Feathering Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC-7 | DC-7B | DC-7C Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 55-15-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-15-05 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-7 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-15-05 DOUGLAS: Applies to All DC-7 Aircraft Below Fuselage No. 486 Equipped With Hamilton Standard Propellers. Compliance required by first scheduled engine change after November 1, 1955, but not later than November 1, 1956. To increase the integrity of the propeller feathering system in the event of a powerplant fire, all existing propeller feathering lines located forward of the firewall in zone 2 must be replaced with lines and flexible hose assemblies which will meet current fireproof and fire resistant requirements. (a) Install Aeroquip 304 protective sleeves on the propeller feathering line forward of the feathering pump, in accordance with Aeroquip Drawing 304005-10S-46. Resistoflex SSFR-3800-10 hose assembly and Aeroquip 309009-10S hose assembly are also considered acceptable for this application. (b) Remove the existing short 304 sleeves from the feathering pump supply line between the oil tank and feathering pump and install a fireproof cover, Douglas P/N 3500614-2. Aeroquip 601000 hose assembly equipped with Aeroquip 304 full-length protective sleeve, or Aeroquip 680-16S hose assembly equipped with Aeroquip 304 short sleeves covering the end fittings are also considered acceptable for this application. (Douglas Service Bulletin DC-7 No. 74 dated July 19, 1955, covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_55-15-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 55-15-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; DOUGLAS All DC-7 Aircraft Subject: Propeller Feathering Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: DC-7 | DC-7B | DC-7C 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: 55-15-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 55-15-05 SUBJECT HEADING: Airworthiness Directives; DOUGLAS All DC-7 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 55-15-05 DOUGLAS: Applies to All DC-7 Aircraft Below Fuselage No. 486 Equipped With Hamilton Standard Propellers. Compliance required by first scheduled engine change after November 1, 1955, but not later than November 1, 1956. To increase the integrity of the propeller feathering system in the event of a powerplant fire, all existing propeller feathering lines located forward of the firewall in zone 2 must be replaced with lines and flexible hose assemblies which will meet current fireproof and fire resistant requirements. (a) Install Aeroquip 304 protective sleeves on the propeller feathering line forward of the feathering pump, in accordance with Aeroquip Drawing 304005-10S-46. Resistoflex SSFR-3800-10 hose assembly and Aeroquip 309009-10S hose assembly are also considered acceptable for this application. (b) Remove the existing short 304 sleeves from the feathering pump supply line between the oil tank and feathering pump and install a fireproof cover, Douglas P/N 3500614-2. Aeroquip 601000 hose assembly equipped with Aeroquip 304 full-length protective sleeve, or Aeroquip 680-16S hose assembly equipped with Aeroquip 304 short sleeves covering the end fittings are also considered acceptable for this application. (Douglas Service Bulletin DC-7 No. 74 dated July 19, 1955, covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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