AD 60-26-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Brantly International, Inc. | B-2 | Airworthiness Directives; Brantly Model B-2 Helicopters |
| aircraft | Brantly International, Inc. | B-2A | Airworthiness Directives; Brantly Model B-2 Helicopters |
| aircraft | Brantly International, Inc. | B-2B | Airworthiness Directives; Brantly Model B-2 Helicopters |
Unsafe Condition
Misalignment of the tail rotor drive shaft installation and insufficient flexibility in the drive shaft coupling system could result in coupling failure and loss of tail rotor drive.
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Required Actions
Remove the B2-108-34 drive shaft extension and B2-108-35 coupling, realign the drive shaft using jig No. AT-108-31 per Service Bulletin No. 4, install an additional flexible coupling with parts B2-108-45 and B2-14-14 using jig No. MT-339-16, and ensure proper orientation of the couplings as per Modification Step No. 15.
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Compliance Time
within 25 hours' time in service after the effective date of this directive
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Affected Aircraft
All Brantly Model B-2 Helicopters prior to serial No. 44 not previously modified per Brantly Service Bulletin No. 4
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Federal Register Abstract
Drive Shaft Coupling
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-26-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-26-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Brantly Model B-2 Helicopters Subject: Drive Shaft Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/20/1960 Make: Brantly International, Inc. Model: B-2 | B-2A | B-2B Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-26-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-26-03 SUBJECT HEADING: Airworthiness Directives; Brantly Model B-2 Helicopters ACTION: SUMMARY: DATES: Effective December 20, 1960. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-26-03 BRANTLY: Amdt. 235 Part 507 Federal Register December 20, 1960. Applies to All Brantly Model B-2 Helicopters Prior To Serial No. 44 Not Previously Modified In Accordance With Brantly Service Bulletin No. 4. Compliance required within 25 hours' time in service after the effective date of this directive. (a) Remove the B2-108-34 drive shaft extension and the B2-108-35 coupling from between the transmission and the oil cooler fan drive pulley. Using Brantly aligning jig No. AT- 108-31 and following instructions in Brantly Service Bulletin No. 4, check alinement of the tail rotor drive shaft installation. Adjust bearing positions as necessary per instructions to obtain satisfactory alinement. (b) Using Brantly drill jig No. MT-339-16 and in accordance with instructions in Service Bulletin No. 4, install an additional flexible coupling on the aft end of the B2-108-34 drive shaft extension. Brantly parts B2-108-45 (one), B2-14-14 (two), plus associated standard attachments prescribed in Service Bulletin No. 4 are required for this modification. Orientation of the two flexible couplings on the shaft with respect to each other in accordance with Modification Step No. 15 of Service Bulletin No. 4 is imperative. This directive effective December 20, 1960. FOOTER:
Document Text
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AD Final Rules - DRS_60-26-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-26-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Brantly Model B-2 Helicopters Subject: Drive Shaft Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/20/1960 Make: Brantly International, Inc. Model: B-2 | B-2A | B-2B 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: 60-26-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-26-03 SUBJECT HEADING: Airworthiness Directives; Brantly Model B-2 Helicopters ACTION: SUMMARY: DATES: Effective December 20, 1960. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-26-03 BRANTLY: Amdt. 235 Part 507 Federal Register December 20, 1960. Applies to All Brantly Model B-2 Helicopters Prior To Serial No. 44 Not Previously Modified In Accordance With Brantly Service Bulletin No. 4. Compliance required within 25 hours' time in service after the effective date of this directive. (a) Remove the B2-108-34 drive shaft extension and the B2-108-35 coupling from between the transmission and the oil cooler fan drive pulley. Using Brantly aligning jig No. AT- 108-31 and following instructions in Brantly Service Bulletin No. 4, check alinement of the tail rotor drive shaft installation. Adjust bearing positions as necessary per instructions to obtain satisfactory alinement. (b) Using Brantly drill jig No. MT-339-16 and in accordance with instructions in Service Bulletin No. 4, install an additional flexible coupling on the aft end of the B2-108-34 drive shaft extension. Brantly parts B2-108-45 (one), B2-14-14 (two), plus associated standard attachments prescribed in Service Bulletin No. 4 are required for this modification. Orientation of the two flexible couplings on the shaft with respect to each other in accordance with Modification Step No. 15 of Service Bulletin No. 4 is imperative. This directive effective December 20, 1960. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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