AD 54-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aircraft Belt & Trim Corporation | Safety Belts | Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) |
| appliance | Aircraft Belt & Trim Corporation | Safety Belts | Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) |
Unsafe Condition
The belt assemblies of Model LBM-1900 (Dwg. No. 19001) Safety Belts manufactured prior to April 1, 1954, with LBM-1900-3 and -3A buckles were found to be under strength for a majority of specimens tested, indicating nonconformance with TSO-C22 standards.
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Required Actions
Replace or remove the affected Safety Belts Model LBM-1900 (Dwg. No. 19001) manufactured prior to April 1, 1954, with LBM-1900-3 and -3A buckles. The belts must not be used in civil aircraft until they comply with TSO-C22 requirements.
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Compliance Time
Compliance required as soon as possible but not later than March 1, 1955.
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Affected Aircraft
Aircraft Belt & Trim Corporation Safety Belts Model LBM-1900 (Dwg. No. 19001) manufactured prior to April 1, 1954, with LBM-1900-3 and -3A buckles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Safety Belts
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_54-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-20-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) Subject: Safety Belts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Aircraft Belt & Trim Corporation Model: Safety Belts Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 54-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-20-01 SUBJECT HEADING: Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-20-01 AIRCRAFT BELT AND TRIM (SAFETY BELT): Applies to Model LBM-1900 (Dwg. No. 19001) Safety Belts Manufactured Prior to April 1, 1954. Compliance required as soon as possible but not later than March 1, 1955. Based on a complaint alleging noncompliance with strength standards of FAA Technical Standard Order C22, verification tests were conducted by the National Bureau of Standards at FAA request, which revealed that the belt assemblies of this make and model manufactured prior to April 1, 1954, with LBM-1900-3 and -3A buckles, were under strength for a majority of specimens tested. These tests are considered as evidence of nonconformance with terms of the TSO. Therefore, TSO-labeled belts of this model as noted above which were manufactured prior to April 1, 1954, can no longer be considered as complying with the prescribed airworthiness standards and, accordingly, must not be used in civil aircraft. Belts of this model manufactured subsequent to April 1, 1954, incorporate a buckle of improved design and tests reveal this belt assembly to be in accordance with TSO-C22 tension test requirements. This supersedes AD 54-03-01. FOOTER:
Document Text
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AD Final Rules - DRS_54-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-20-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) Subject: Safety Belts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Aircraft Belt & Trim Corporation Model: Safety Belts Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 54-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-20-01 SUBJECT HEADING: Airworthiness Directives; Aircraft Belt and Trim (Safety Belt): Model LBM-1900 (Dwg. No. 19001) ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-20-01 AIRCRAFT BELT AND TRIM (SAFETY BELT): Applies to Model LBM-1900 (Dwg. No. 19001) Safety Belts Manufactured Prior to April 1, 1954. Compliance required as soon as possible but not later than March 1, 1955. Based on a complaint alleging noncompliance with strength standards of FAA Technical Standard Order C22, verification tests were conducted by the National Bureau of Standards at FAA request, which revealed that the belt assemblies of this make and model manufactured prior to April 1, 1954, with LBM-1900-3 and -3A buckles, were under strength for a majority of specimens tested. These tests are considered as evidence of nonconformance with terms of the TSO. Therefore, TSO-labeled belts of this model as noted above which were manufactured prior to April 1, 1954, can no longer be considered as complying with the prescribed airworthiness standards and, accordingly, must not be used in civil aircraft. Belts of this model manufactured subsequent to April 1, 1954, incorporate a buckle of improved design and tests reveal this belt assembly to be in accordance with TSO-C22 tension test requirements. This supersedes AD 54-03-01. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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