AD 56-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Swift Museum Foundation, Inc. | GC-1A | Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft |
| aircraft | Swift Museum Foundation, Inc. | GC-1B | Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft |
Unsafe Condition
Failure of the aluminum alloy torque knees on E.L.I. type landing gear assemblies, which do not provide the required extension stop (P/N 64A31), leading to loss of landing gear and damage to the airplane.
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Required Actions
Replace aluminum alloy torque knees with forged steel knees (E.L.I. P/N 64A40) on aircraft not equipped with Adel main landing gear struts. Forged steel knees may be used on all landing gear units. Adel forged aluminum torque knees on Adel struts may be retained.
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Compliance Time
As soon as possible but not later than September 15, 1956.
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Affected Aircraft
Universal (Globe) Models GC-1A and GC-1B Aircraft with serial numbers higher than 196 equipped with E.L.I. type gear.
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Federal Register Abstract
Landing Gear Torque Knees
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_56-16-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-16-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft Subject: Landing Gear Torque Knees Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Swift Museum Foundation, Inc. Model: GC-1A | GC-1B Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 56-16-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-16-04 SUBJECT HEADING: Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-16-04 UNIVERSAL (Globe): Applies to Models GC-1A and GC-1B Aircraft. To be accomplished as soon as possible but not later than September 15, 1956. It has been reported that the landing gear was replaced with an E.L.I. type gear (air-oil) on a Globe Model GC-1B airplane with a serial number higher than 196. A subsequent failure of one of the aluminum alloy torque knees resulted in the loss of the left landing gear and damage to the airplane. It is probable that the Adel aluminum alloy knee was substituted for the regular P/N 64A40 forged steel knee. The Adel aluminum alloy knee is not a suitable replacement on the E.L.I. gear assembly, since it does not provide for the extension stop, P/N 64A31. To preclude similar occurrences, all aircraft not equipped with Adel main landing gear struts must replace the aluminum alloy torque knees with forged steel knees. 1. On aircraft equipped with Adel struts, the Adel forged aluminum torque knee assembly is satisfactory and may be retained. 2. Forged steel knees, E.L.I. P/N 64A40 are suitable as replacements on all types of landing gear units. This supersedes AD 46-33-01. FOOTER:
Document Text
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AD Final Rules - DRS_56-16-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-16-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft Subject: Landing Gear Torque Knees Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Swift Museum Foundation, Inc. Model: GC-1A | GC-1B Product Type: Aircraft Product Subtype: Small 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: 56-16-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-16-04 SUBJECT HEADING: Airworthiness Directives; Universal (Globe) Models GC-1A and GC-1B Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-16-04 UNIVERSAL (Globe): Applies to Models GC-1A and GC-1B Aircraft. To be accomplished as soon as possible but not later than September 15, 1956. It has been reported that the landing gear was replaced with an E.L.I. type gear (air-oil) on a Globe Model GC-1B airplane with a serial number higher than 196. A subsequent failure of one of the aluminum alloy torque knees resulted in the loss of the left landing gear and damage to the airplane. It is probable that the Adel aluminum alloy knee was substituted for the regular P/N 64A40 forged steel knee. The Adel aluminum alloy knee is not a suitable replacement on the E.L.I. gear assembly, since it does not provide for the extension stop, P/N 64A31. To preclude similar occurrences, all aircraft not equipped with Adel main landing gear struts must replace the aluminum alloy torque knees with forged steel knees. 1. On aircraft equipped with Adel struts, the Adel forged aluminum torque knee assembly is satisfactory and may be retained. 2. Forged steel knees, E.L.I. P/N 64A40 are suitable as replacements on all types of landing gear units. This supersedes AD 46-33-01. 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.
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