AD 54-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 49, 649, 749, and 1049 Airplanes |
Unsafe Condition
Premature failure of flexible hose in the feathering line and penetration of fire from zone 1 into zone 2 due to engine fire.
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Required Actions
Replace flexible hose assemblies with those meeting current fire resistance requirements per specified service bulletins. Install steel plates over lower engine cowling longerons adjacent to the diaphragm per service bulletins.
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Compliance Time
April 1, 1955
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Affected Aircraft
Lockheed Models 49, 649, 749, and 1049 airplanes as noted in referenced service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Flexible Hose Replacement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_54-22-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-22-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, 749, and 1049 Airplanes Subject: Flexible Hose Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 49-46 | 649-79 | 649A-79 | 749-79...Show more 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 54-22-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-22-01 SUBJECT HEADING: LOCKHEED Models 49, 649, 749, and 1049 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-22-01 LOCKHEED: Applies to Models 49, 649, 749, and 1049 Airplanes as Noted in Referenced Service Bulletins. Compliance required by April 1, 1955. A recent engine fire resulted in a premature failure of a flexible hose in the feathering line and in penetration of fire from zone 1 into zone 2. 1. To increase the fire resistance integrity of the propeller feathering line between the pump and the governor, replace the existing flexible hose assemblies meeting current fire resistance requirements. The following Lockheed Service Bulletins cover this subject: No. 49/SB-786 for Model 049 through 749 airplanes and No. 1049/SB-2195 for Model 1049 airplanes. The following hose assemblies may also be considered acceptable for this application: (a) Aeroquip 680-10S hose assemblies with Aeroquip 304 protective sleeves over end fittings. (b) Resistoflex - SSFR-3800-10 hose assemblies. 2. To increase the fireproof integrity of the zone 1 fire seal diaphragm against burn-through into zone 2 in the event of a power section fire install steel plates over the lower engine cowling longerons adjacent to the diaphragm. The following Lockheed Service Bulletins cover this subject: No. 49/SB-760 for Model 649/749 airplanes and No. 1049/SB-2115 for Model 1049 airplanes. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_54-22-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-22-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, 749, and 1049 Airplanes Subject: Flexible Hose Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 49-46 | 649-79 | 649A-79 | 749-79...Show more 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 54-22-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-22-01 SUBJECT HEADING: LOCKHEED Models 49, 649, 749, and 1049 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-22-01 LOCKHEED: Applies to Models 49, 649, 749, and 1049 Airplanes as Noted in Referenced Service Bulletins. Compliance required by April 1, 1955. A recent engine fire resulted in a premature failure of a flexible hose in the feathering line and in penetration of fire from zone 1 into zone 2. 1. To increase the fire resistance integrity of the propeller feathering line between the pump and the governor, replace the existing flexible hose assemblies meeting current fire resistance requirements. The following Lockheed Service Bulletins cover this subject: No. 49/SB-786 for Model 049 through 749 airplanes and No. 1049/SB-2195 for Model 1049 airplanes. The following hose assemblies may also be considered acceptable for this application: (a) Aeroquip 680-10S hose assemblies with Aeroquip 304 protective sleeves over end fittings. (b) Resistoflex - SSFR-3800-10 hose assemblies. 2. To increase the fireproof integrity of the zone 1 fire seal diaphragm against burn-through into zone 2 in the event of a power section fire install steel plates over the lower engine cowling longerons adjacent to the diaphragm. The following Lockheed Service Bulletins cover this subject: No. 49/SB-760 for Model 649/749 airplanes and No. 1049/SB-2115 for Model 1049 airplanes. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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