AD 78-18-03
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters |
Unsafe Condition
Drive shaft failure due to internal corrosion and subsequent helicopter structural and control system damage.
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Required Actions
Perform inspection and modifications and/or replacements of the Soloy P/N 560-2408 shaft in accordance with Soloy Conversions, Limited Service Bulletin 05-560 dated May 19, 1978, or later FAA approved revisions. Equivalent methods of compliance must be approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region.
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Compliance Time
Within the next 600 hours time in service, or 6 months calendar time, whichever occurs first after the effective date of this AD.
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Affected Aircraft
Hiller Aviation | Siam Hiller Holdings, Inc. Models UH-12D and UH-12E helicopters converted to turbine power under Soloy Conversions, Limited STC Nos. SH177WE and SH178WE respectively.
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Federal Register Abstract
Drive Shaft
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-18-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-18-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters Subject: Drive Shaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/06/1978 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | UH-12E Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-18-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3291 AD NUMBER: 78-18-03 SUBJECT HEADING: Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters ACTION: SUMMARY: DATES: Effective October 6, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-18-03 HILLER AVIATION: Amendment 39-3291. Applies to Model UH-12D and UH-12E helicopters which have been converted to turbine power in accordance with Soloy Conversions, Limited, STC Nos. SH177WE and SH178WE respectively, certificated in all categories. Compliance required as indicated unless already accomplished. To reduce the possibility of drive shaft failure due to internal corrosion and subsequent helicopter structural and control system damage, accomplish the following: A. Within the next 600 hours time in service, or 6 months calendar time, whichever occurs first after the effective date of this AD, perform the inspection and modifications and/or replacements, as appropriate, of the Soloy P/N 560-2408 shaft in accordance with Soloy Conversions, Limited Service Bulletin 05-560 dated May 19, 1978, or later FAA approved revisions. B. Equivalent methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., Post Office Box 60, Chehalis, Washington 98532. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective October 6, 1978. FOOTER:
Document Text
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AD Final Rules - DRS_78-18-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-18-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters Subject: Drive Shaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/06/1978 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | UH-12E 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: 78-18-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3291 AD NUMBER: 78-18-03 SUBJECT HEADING: Airworthiness Directives; Hiller Models UH-12D and UH-12E Helicopters ACTION: SUMMARY: DATES: Effective October 6, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-18-03 HILLER AVIATION: Amendment 39-3291. Applies to Model UH-12D and UH-12E helicopters which have been converted to turbine power in accordance with Soloy Conversions, Limited, STC Nos. SH177WE and SH178WE respectively, certificated in all categories. Compliance required as indicated unless already accomplished. To reduce the possibility of drive shaft failure due to internal corrosion and subsequent helicopter structural and control system damage, accomplish the following: A. Within the next 600 hours time in service, or 6 months calendar time, whichever occurs first after the effective date of this AD, perform the inspection and modifications and/or replacements, as appropriate, of the Soloy P/N 560-2408 shaft in accordance with Soloy Conversions, Limited Service Bulletin 05-560 dated May 19, 1978, or later FAA approved revisions. B. Equivalent methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., Post Office Box 60, Chehalis, Washington 98532. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective October 6, 1978. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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