AD 69-13-07
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12L | Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12L4 | Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E-L | Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters |
Unsafe Condition
Failure of the attachment of collective yoke support brackets, P/N 31351 or 31483, to upper transmission housings, P/N 23541 or 23541-5, due to cracked Rosan inserts or insufficient bolt torque below 50 inch pounds.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 10 hours time in service after the effective date, inspect attachment bolts for torque and visually inspect Rosan inserts for cracks or damage. Replace damaged inserts and those with bolt torque less than 50 inch pounds before further flight. Within 100 hours' time in service, replace Rosan R206SB-8 inserts with RD206SB-8 inserts and install MS20073-04-7 bolts. For oversize R231SB-8 inserts, replace with RD231SB-8 inserts and RL-31-SB-9 locking rings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours time in service after the effective date of this AD (for part (a)) and within the next 100 hours' time in service after the effective date (for part (b))
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 helicopters certified in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Collective Yoke Support Brackets
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_69-13-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 69-13-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters Subject: Collective Yoke Support Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/30/1970 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | UH-12L | UH-12L4 | UH-12E | UH-12E-L 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: 69-13-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-970 AD NUMBER: 69-13-07 SUBJECT HEADING: Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters ACTION: SUMMARY: DATES: Effective April 30, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 69-13-07 FAIRCHILD HILLER: Amdt. 39-789 as amended by Amendment 39-970. Applies to UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 type helicopters certified in all categories. Compliance required as indicated. To prevent failure of the attachment of collective yoke support brackets, P/N 31351 or 31483, to upper transmission housings, P/N 23541 or 23541-5, accomplish the following: (a) Within the next 10 hours time in service after the effective date of this AD, unless already accomplished, inspect the collective yoke support bracket attachment bolts for torque and visually inspect the Rosan inserts in the transmission housing for cracks or any other damage. Replace damaged inserts, and inserts where a bolt torque of less than 50 inch pounds is encountered, prior to further flight in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. (b) Within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, remove the Rosan R206SB-8 inserts and install Rosan RD206SB-8 inserts in their place, and install MS20073-04-7 bolts in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Where oversize Rosan R231SB-8 inserts have been installed, replace with Rosan RD231SB-8 inserts and RL-31-SB-9 locking rings in accordance with Fairchild Hiller Service Bulletins UH12L-23-1 and UH12D through G-23-1 dated 19 January 1970 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Amendment 39-789 effective July 9, 1969. This Amendment (39-970) is effective April 30, 1970. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_69-13-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 69-13-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters Subject: Collective Yoke Support Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/30/1970 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | UH-12L | UH-12L4 | UH-12E | UH-12E-L 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: 69-13-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-970 AD NUMBER: 69-13-07 SUBJECT HEADING: Airworthiness Directives; Fairchild Hiller Models UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 Helicopters ACTION: SUMMARY: DATES: Effective April 30, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 69-13-07 FAIRCHILD HILLER: Amdt. 39-789 as amended by Amendment 39-970. Applies to UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 type helicopters certified in all categories. Compliance required as indicated. To prevent failure of the attachment of collective yoke support brackets, P/N 31351 or 31483, to upper transmission housings, P/N 23541 or 23541-5, accomplish the following: (a) Within the next 10 hours time in service after the effective date of this AD, unless already accomplished, inspect the collective yoke support bracket attachment bolts for torque and visually inspect the Rosan inserts in the transmission housing for cracks or any other damage. Replace damaged inserts, and inserts where a bolt torque of less than 50 inch pounds is encountered, prior to further flight in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. (b) Within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, remove the Rosan R206SB-8 inserts and install Rosan RD206SB-8 inserts in their place, and install MS20073-04-7 bolts in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Where oversize Rosan R231SB-8 inserts have been installed, replace with Rosan RD231SB-8 inserts and RL-31-SB-9 locking rings in accordance with Fairchild Hiller Service Bulletins UH12L-23-1 and UH12D through G-23-1 dated 19 January 1970 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Amendment 39-789 effective July 9, 1969. This Amendment (39-970) is effective April 30, 1970. 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.