AD 78-22-08
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters |
Unsafe Condition
Loss of flight control or engine control
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Required Actions
Modify the integrated collective and N2 engine control system per Soloy Conversions, Ltd. Service Bulletin 06-560 or approved revision. Remove specified N1 and N2 engine control cables and install replacement cables as per the same bulletin. Equivalent modifications may be approved by the FAA.
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Compliance Time
on or before January 1, 1979
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Affected Aircraft
Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters converted to turbine power under Soloy Conversions STC Nos. SH177WE and SH178WE
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Federal Register Abstract
Flight/Engine Control
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-22-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-22-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters Subject: Flight/Engine Control Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/30/1978 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| Siam Hiller Holdings, Inc. Model: UH-12D | UH-12E Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-22-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3327 AD NUMBER: 78-22-08 SUBJECT HEADING: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters ACTION: SUMMARY: DATES: Effective November 30, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-22-08 HILLER AVIATION: Amendment 39-3327. Applies to Model UH-12D and UH-12E helicopters, including the UH-12E 4-place configurations, which have been converted to turbine power in accordance with Soloy Conversions, Ltd., STC Nos. SH177WE and SH178WE respectively, certificated in all categories. Compliance required on or before January 1, 1979. To prevent loss of flight control or engine control, accomplish the following: (a) Modify the integrated collective and N2 engine control system in accordance with Soloy Conversions, Ltd., Service Bulletin 06-560 dated October 6, 1978, or later FAA approved revision. (b) Unless already accomplished, remove from service certain N1 and N2 engine control cables as identified in Soloy Conversions, Ltd., Service Bulletin 06-560 dated October 6, 1978, or later FAA approved revisions. Install replacement cables in accordance with the same bulletin. (c) An equivalent modification may 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 this document from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., P.O. Box 60, Chehalis, Washington 98532. This document may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective November 30, 1978. FOOTER:
Document Text
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AD Final Rules - DRS_78-22-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-22-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters Subject: Flight/Engine Control Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 11/30/1978 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: 78-22-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3327 AD NUMBER: 78-22-08 SUBJECT HEADING: Airworthiness Directives; Hiller Models UH-12D, UH-12E, and UH-12E 4-Place Helicopters ACTION: SUMMARY: DATES: Effective November 30, 1978. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-22-08 HILLER AVIATION: Amendment 39-3327. Applies to Model UH-12D and UH-12E helicopters, including the UH-12E 4-place configurations, which have been converted to turbine power in accordance with Soloy Conversions, Ltd., STC Nos. SH177WE and SH178WE respectively, certificated in all categories. Compliance required on or before January 1, 1979. To prevent loss of flight control or engine control, accomplish the following: (a) Modify the integrated collective and N2 engine control system in accordance with Soloy Conversions, Ltd., Service Bulletin 06-560 dated October 6, 1978, or later FAA approved revision. (b) Unless already accomplished, remove from service certain N1 and N2 engine control cables as identified in Soloy Conversions, Ltd., Service Bulletin 06-560 dated October 6, 1978, or later FAA approved revisions. Install replacement cables in accordance with the same bulletin. (c) An equivalent modification may 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 this document from the manufacturer, may obtain copies upon request to Soloy Conversions, Ltd., P.O. Box 60, Chehalis, Washington 98532. This document may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective November 30, 1978. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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