AD 68-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter |
Unsafe Condition
Failures of the lower coupling drive shaft (Hughes P/N 269A5504-3) or lower coupling drive shaft assembly (Hughes P/N 80-269A5504-5 or 269A5504-5) due to cracks.
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Required Actions
Inspect the entire shaft per Hughes Service Information Notice No. N-55.1 or equivalent. Retire and replace shaft if cracks are found; identify the shaft if no cracks are found. Ensure inspection or identification is accomplished before installing replacement shafts.
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Compliance Time
within 25 hours of helicopter operation after the effective date of this airworthiness directive
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Affected Aircraft
Schweizer Aircraft Corporation Models 269A (Serial Nos. 0011 through 0893 except TH-55A), 269A-1 (Serial Nos. 0001 through 0041), 269A-2 (Serial Nos. 0001 and 0002), 269B (Series Nos. 0001 through 0359) with specified lower coupling drive shaft parts installed.
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Federal Register Abstract
Lower Coupling Drive Shaft
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_68-26-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-26-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter Subject: Lower Coupling Drive Shaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/21/1968 Make: Schweizer Aircraft Corporation Model: 269A | 269A-1 | 269B Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 68-26-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-696 AD NUMBER: 68-26-01 SUBJECT HEADING: Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter ACTION: SUMMARY: DATES: Effective December 21, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-26-01 HUGHES: Amendment 39-696. Applies to Model 269A Helicopter Serial Nos. 0011 through 0893 (except TH-55A helicopters), 269A-1 Helicopter Serial Nos. 0001 through 0041, 269A-2 Helicopters Serial Nos. 0001 and 0002, 269B Helicopter Series Nos. 0001 through 0359 with P/N 269A5504-3 Lower Coupling Drive Shaft or Hughes P/N 80-269A5504-5 or P/N 269A5504-5 Lower Coupling Drive Shaft assembly installed. Compliance required within 25 hours of helicopter operation after the effective date of this airworthiness directive, unless previously accomplished. To prevent failures of the lower coupling drive shaft (Hughes P/N 269A5504-3) or lower coupling drive shaft assembly (Hughes P/N 80-269A5504-5 or 269A5504-5) by assuring the physical integrity of the shaft, including freedom from cracks: (a) Inspect the entire shaft per Hughes Service Information Notice No. N-55.1, dated December 9, 1968, or later FAA approved revisions, or any equivalent inspection approved by the Chief, Aircraft Engineering Division, Western Region. (1) If cracks are found during this inspection, retire shaft from service and replace with a new shaft. (2) If no cracks are found, identify the shaft per Item "m" of Hughes Service Information Notice No. N-55.1, or later FAA approved revisions, or equivalent identification approved by the Chief, Aircraft Engineering Division, Western Region. The shaft may continue to be used in accordance with service life limitations. (b) Determine that the inspection or identification, as appropriate, specified in paragraph (a) has been accomplished, prior to installing replacement lower coupling drive shafts (P/N 269A5504-3). This supersedes Amendment 39-661 (33 F.R. 14636), AD 68-20-03. This amendment becomes effective December 21, 1968. FOOTER:
Document Text
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AD Final Rules - DRS_68-26-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 68-26-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter Subject: Lower Coupling Drive Shaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/21/1968 Make: Schweizer Aircraft Corporation Model: 269A | 269A-1 | 269B Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 68-26-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-696 AD NUMBER: 68-26-01 SUBJECT HEADING: Airworthiness Directives; Hughes Models 269A, 269A-1, 269A-2, and 269B Helicopter ACTION: SUMMARY: DATES: Effective December 21, 1968. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 68-26-01 HUGHES: Amendment 39-696. Applies to Model 269A Helicopter Serial Nos. 0011 through 0893 (except TH-55A helicopters), 269A-1 Helicopter Serial Nos. 0001 through 0041, 269A-2 Helicopters Serial Nos. 0001 and 0002, 269B Helicopter Series Nos. 0001 through 0359 with P/N 269A5504-3 Lower Coupling Drive Shaft or Hughes P/N 80-269A5504-5 or P/N 269A5504-5 Lower Coupling Drive Shaft assembly installed. Compliance required within 25 hours of helicopter operation after the effective date of this airworthiness directive, unless previously accomplished. To prevent failures of the lower coupling drive shaft (Hughes P/N 269A5504-3) or lower coupling drive shaft assembly (Hughes P/N 80-269A5504-5 or 269A5504-5) by assuring the physical integrity of the shaft, including freedom from cracks: (a) Inspect the entire shaft per Hughes Service Information Notice No. N-55.1, dated December 9, 1968, or later FAA approved revisions, or any equivalent inspection approved by the Chief, Aircraft Engineering Division, Western Region. (1) If cracks are found during this inspection, retire shaft from service and replace with a new shaft. (2) If no cracks are found, identify the shaft per Item "m" of Hughes Service Information Notice No. N-55.1, or later FAA approved revisions, or equivalent identification approved by the Chief, Aircraft Engineering Division, Western Region. The shaft may continue to be used in accordance with service life limitations. (b) Determine that the inspection or identification, as appropriate, specified in paragraph (a) has been accomplished, prior to installing replacement lower coupling drive shafts (P/N 269A5504-3). This supersedes Amendment 39-661 (33 F.R. 14636), AD 68-20-03. This amendment becomes effective December 21, 1968. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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