AD 67-17-06
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | HRS-1/CH-19 | Airworthiness Directives; Sikorsky Model S-55 Series Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | HRS-3/H-19B | Airworthiness Directives; Sikorsky Model S-55 Series Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55 | Airworthiness Directives; Sikorsky Model S-55 Series Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55B | Airworthiness Directives; Sikorsky Model S-55 Series Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55C | Airworthiness Directives; Sikorsky Model S-55 Series Helicopters |
Unsafe Condition
Fatigue cracks in the pylon lower ring (P/N S14-20-3013) with 3,500 or more hours' time in service may occur, leading to potential failure of the tail cone and pylon assembly.
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Required Actions
Inspect the pylon lower ring within the next 10 hours' time in service and thereafter every 10 hours. Remove pylon lower ring assemblies with 3,400+ hours within 100 hours' time in service, or before 3,500 hours. Replace cracked assemblies before flight.
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Compliance Time
Within the next 10 hours' time in service and thereafter at intervals not to exceed 10 hours' time in service. For assemblies with 3,400+ hours, within the next 100 hours' time in service. Replace cracked parts before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Model S-55 Series helicopters equipped with S14-20-5300 Series Tail Cone and Pylon Assembly (Straight Tail Cone).
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Pylon Lower Ring
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_67-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 67-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Model S-55 Series Helicopters Subject: Pylon Lower Ring Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/21/1967 Make: Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation Model: HRS-1/CH-19 | HRS-3/H-19B | S-55 | S-55B | S-55C 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: 67-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-415 AD NUMBER: 67-17-06 SUBJECT HEADING: Airworthiness Directives; Sikorsky Model S-55 Series Helicopters ACTION: SUMMARY: DATES: Effective May 21, 1967. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 67-17-06 SIKORSKY: Amdt. 39-415 Part 39 Federal Register May 16, 1967. Applies to Model S-55 Series Helicopters Equipped with S14-20-5300 Series Tail Cone and Pylon Assembly (Straight Tail Cone). Compliance required as indicated. To prevent operation with fatigue cracks in the pylon lower ring accomplish the following: (a) Within the next 10 hours' time in service and thereafter at intervals not to exceed 10 hours' time in service from the last inspection, remove the pylon lower access cover and visually inspect for cracks pylon lower ring, P/N S14-20-3013, with 3,500 or more hours' time in service on the effective date of this AD. NOTE: - Where excess paint that may hinder the visual inspection is present, remove with MIL-R-8633 water-soluble paint remover and apply a light coat of MIL-P-8585 zinc chromate primer. (b) If a crack is found, replace the pylon lower ring assembly, P/N S14-20-3052, before further flight. (c) Remove from service pylon lower ring assembly, P/N S-14-20-3052, with 3,400 or more hours' time in service on the effective date of this AD within the next 100 hours' time in service. (d) Remove from service all other pylon lower ring assemblies, P/N S14-20-3052, before the accumulation of 3,500 hours' time in service. (e) Operators who have not kept records of hours of time in service on pylon lower ring assembly, P/N S14-20-3052, shall substitute helicopter hours of time in service in lieu thereof. (Sikorsky Service Bulletin 55B20-1E covers this subject.) This directive effective May 21, 1967. FOOTER:
Document Text
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AD Final Rules - DRS_67-17-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 67-17-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Model S-55 Series Helicopters Subject: Pylon Lower Ring Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/21/1967 Make: Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation Model: HRS-1/CH-19 | HRS-3/H-19B | S-55 | S-55B | S-55C 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: 67-17-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-415 AD NUMBER: 67-17-06 SUBJECT HEADING: Airworthiness Directives; Sikorsky Model S-55 Series Helicopters ACTION: SUMMARY: DATES: Effective May 21, 1967. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 67-17-06 SIKORSKY: Amdt. 39-415 Part 39 Federal Register May 16, 1967. Applies to Model S-55 Series Helicopters Equipped with S14-20-5300 Series Tail Cone and Pylon Assembly (Straight Tail Cone). Compliance required as indicated. To prevent operation with fatigue cracks in the pylon lower ring accomplish the following: (a) Within the next 10 hours' time in service and thereafter at intervals not to exceed 10 hours' time in service from the last inspection, remove the pylon lower access cover and visually inspect for cracks pylon lower ring, P/N S14-20-3013, with 3,500 or more hours' time in service on the effective date of this AD. NOTE: - Where excess paint that may hinder the visual inspection is present, remove with MIL-R-8633 water-soluble paint remover and apply a light coat of MIL-P-8585 zinc chromate primer. (b) If a crack is found, replace the pylon lower ring assembly, P/N S14-20-3052, before further flight. (c) Remove from service pylon lower ring assembly, P/N S-14-20-3052, with 3,400 or more hours' time in service on the effective date of this AD within the next 100 hours' time in service. (d) Remove from service all other pylon lower ring assemblies, P/N S14-20-3052, before the accumulation of 3,500 hours' time in service. (e) Operators who have not kept records of hours of time in service on pylon lower ring assembly, P/N S14-20-3052, shall substitute helicopter hours of time in service in lieu thereof. (Sikorsky Service Bulletin 55B20-1E covers this subject.) This directive effective May 21, 1967. FOOTER:
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Retrieved: Apr 8, 2026
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