AD 84-19-08
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12D | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
| aircraft | Hiller Aviation | Siam Hiller Holdings, Inc. | UH-12E-L | Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters |
Unsafe Condition
Cracks in the gusset weld beads of engine mount Part No. 63181-5 due to fatigue from turbine power conversion under STC SH177WE or SH178WE.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove paint from the outer gimbal forward attach fitting of engine mount Part No. 63181-5 and perform dye penetrant or magnetic particle inspection of the gusset weld beads for cracks on both sides. Replace the engine mount if cracks are found before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 20 hours time in service after the effective date, and thereafter at intervals not to exceed 600 hours time in service from the last inspection.
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Affected Aircraft
HILLER HELICOPTERS Model UH-12D and UH-12E series helicopters equipped with engine mount Part No. 63181-5 and converted to turbine power via STC SH177WE or SH178WE.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Mount
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_84-19-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-19-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters Subject: Engine Mount Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/20/1984 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | UH-12E | UH-12E-L Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 84-19-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4914 AD NUMBER: 84-19-08 SUBJECT HEADING: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters ACTION: SUMMARY: DATES: Effective September 20, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-19-08 HILLER HELICOPTERS, a subsidiary of Rogerson Aircraft Corp (formerly Hiller Aviation): Amendment 39-4914. Applies to Model UH-12D and UH-12E series helicopters equipped with engine mount Part No. 63181-5 certificated in any category which have been converted to turbine power by STC SH177WE or SH178WE. Compliance is required as indicated (unless already accomplished). (a) Within the next 20 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 600 hours time in service from the last inspection, remove the paint from the outer gimbal forward attach fitting of the Hiller engine mount Part No. 63181-5 and dye penetrant or magnetic particle inspect the gusset weld beads for cracks on both the front and back sides of the gusset. (b) If cracks are found, replace the engine mount Part No. 63181-5 before further flight. (c) Prior to or immediately following installation or reinstallation of engine mount Part No. 63181-5 in any of the Model UH-12 series helicopters listed above, perform the inspection required by paragraph (a) of this AD. (d) Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168. This supersedes Amendment 39-3538 (44 FR 50035; August 27, 1979), AD 79-18-01. This amendment becomes effective September 20, 1984. FOOTER:
Document Text
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AD Final Rules - DRS_84-19-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-19-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters Subject: Engine Mount Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/20/1984 Make: Hiller Aviation | Siam Hiller Holdings, Inc. Model: UH-12D | 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: 84-19-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4914 AD NUMBER: 84-19-08 SUBJECT HEADING: Airworthiness Directives; HILLER HELICOPTERS Model UH-12D and UH-12E Series Helicopters ACTION: SUMMARY: DATES: Effective September 20, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-19-08 HILLER HELICOPTERS, a subsidiary of Rogerson Aircraft Corp (formerly Hiller Aviation): Amendment 39-4914. Applies to Model UH-12D and UH-12E series helicopters equipped with engine mount Part No. 63181-5 certificated in any category which have been converted to turbine power by STC SH177WE or SH178WE. Compliance is required as indicated (unless already accomplished). (a) Within the next 20 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 600 hours time in service from the last inspection, remove the paint from the outer gimbal forward attach fitting of the Hiller engine mount Part No. 63181-5 and dye penetrant or magnetic particle inspect the gusset weld beads for cracks on both the front and back sides of the gusset. (b) If cracks are found, replace the engine mount Part No. 63181-5 before further flight. (c) Prior to or immediately following installation or reinstallation of engine mount Part No. 63181-5 in any of the Model UH-12 series helicopters listed above, perform the inspection required by paragraph (a) of this AD. (d) Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168. This supersedes Amendment 39-3538 (44 FR 50035; August 27, 1979), AD 79-18-01. This amendment becomes effective September 20, 1984. FOOTER:
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Retrieved: Apr 8, 2026
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