AD 47-43-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 18 | LOCKHEED Model 18 |
Unsafe Condition
Alfite Model 2CD1722 operating heads for CO2 and nitrogen bottles may have unmarked cable sheaves (part number 2CD2248) that could jam due to an unrounded inner shoulder ramp.
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Required Actions
Inspect operating heads for 'L' stamp; disassemble and examine cable sheave part number if unstamped. Rework sheaves by rounding the inner shoulder ramp for 1 1/4 inches if part number 2CD2248. Stamp 'R' on reworked heads.
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Compliance Time
prior to February 1, 1948
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Affected Aircraft
Lockheed Model 18 aircraft, all serial numbers, with Alfite Model 2CD1722 operating heads for CO2 and nitrogen bottles.
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Federal Register Abstract
Fire Extinguisher Bottle Rework
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-43-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-43-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 18 Subject: Fire Extinguisher Bottle Rework Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 18 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-43-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-43-10 SUBJECT HEADING: LOCKHEED Model 18 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-43-10 LOCKHEED: (Was Mandatory Note 21 of AD-723-3.) Applies to All Model 18 Serial Numbers. Compliance required prior to February 1, 1948. Inspect all Alfite Model 2CD1722 operating heads for the CO2 bottles (fire extinguishing system) and nitrogen bottles (emergency landing gear extension system) to determine whether these heads have been stamped with the letter "L" adjacent to the swivelnut. If the head is not marked in this manner, disassemble the head and examine the cable sheave for part number. All 2CD2248 sheaves should be reworked by rounding the inner shoulder of the ramp at its lower end throughout a distance of 1 1/4 inches, to eliminate possible jamming of the mechanism. When reworked sheaves are installed, the operating heads should be identified by the letter "R" stamped adjacent to the swivelnut. (Lockheed Service Bulletin 18/SB-140 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-43-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-43-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 18 Subject: Fire Extinguisher Bottle Rework Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 18 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: 47-43-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-43-10 SUBJECT HEADING: LOCKHEED Model 18 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-43-10 LOCKHEED: (Was Mandatory Note 21 of AD-723-3.) Applies to All Model 18 Serial Numbers. Compliance required prior to February 1, 1948. Inspect all Alfite Model 2CD1722 operating heads for the CO2 bottles (fire extinguishing system) and nitrogen bottles (emergency landing gear extension system) to determine whether these heads have been stamped with the letter "L" adjacent to the swivelnut. If the head is not marked in this manner, disassemble the head and examine the cable sheave for part number. All 2CD2248 sheaves should be reworked by rounding the inner shoulder of the ramp at its lower end throughout a distance of 1 1/4 inches, to eliminate possible jamming of the mechanism. When reworked sheaves are installed, the operating heads should be identified by the letter "R" stamped adjacent to the swivelnut. (Lockheed Service Bulletin 18/SB-140 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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