AD 66-04-03
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | HRS-1/CH-19 | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | HRS-3/H-19B | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55 | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55B | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S-55C | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
| aircraft | Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation | S62A | Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters |
Unsafe Condition
Fatigue cracks in the spar of a main rotor blade
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service S14-10-2100 series main rotor blades with 2,225 or more hours' time in service on the effective date within the next 25 hours' time in service. Remove from service S14-10-2201 series main rotor blades with 2,100 or more hours' time in service on the effective date within the next 150 hours' time in service. Blades modified to S14-10-2201-9 may extend service life to 6,000 hours if inspected per Sikorsky Service Bulletins and corrected as required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Effective April 27, 1976
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Sikorsky Models S-55 Series and S-62A Helicopters with S14-10-2100 or S14-10-2201 series main rotor blades
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Rotor Blades
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_66-04-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-04-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters Subject: Main Rotor Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/27/1976 Make: Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation Model: HRS-1/CH-19 | HRS-3/H-19B | S-55 | S-55B | S-55C | S62A 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: 66-04-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2577 AD NUMBER: 66-04-03 SUBJECT HEADING: Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters ACTION: SUMMARY: DATES: Effective April 27, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-04-03 SIKORSKY: Amdt. 39-194 Part 39 Federal Register February 12, 1966, as amended by Amendment 39-1563 is further amended by Amendment 39-2577. Applies to Models S-55 Series and S-62A Helicopters. Compliance required as indicated. To prevent operation with fatigue cracks in the spar of a main rotor blade, accomplish the following: (a) Except as provided in (e), remove from service S14-10-2100 series main rotor blades with 2,225 or more hours' time in service on the effective date of this AD within the next 25 hours' time in service. (b) Except as provided in (e), remove from service S14-10-2100 series main rotor blades with less than 2,225 hours' time in service on the effective date of this AD before the accumulation of 2,250 hours' time in service. (c) Except as provided in (e), remove from service S14-10-2201 series main rotor blades with 2,100 or more hours' time in service on the effective date of this AD within the next 150 hours' time in service. (d) Except as provided in (e), remove from service S14-10-2201 series main rotor blades with less than 2,100 hours' time in service on the effective date of this AD before the accumulation of 2,250 hours' time in service. (e) The service life limits specified in (a), (b), (c), and (d) may be extended to 6,000 hours' total time in service for S14-10-2201-9 main rotor blades and S14-10-2100 series and S14- 10-2201 series blades modified to S14-10-2201-9 blades, provided the blades are inspected at the times and in the manner set forth in Sikorsky Service Bulletin No. 55B10-7E dated March 26, 1976 or No. 62B10-6E dated March 26, 1976 or later FAA approved revisions, as applicable, and, if low pressure is indicated, the cause is determined and corrected before further flight in accordance with the applicable service bulletin. Amendment 39-194 became effective February 12, 1966. Amendment 39-1563 became effective November 30, 1972. This Amendment 39-2577 becomes effective April 27, 1976. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_66-04-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-04-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters Subject: Main Rotor Blades Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/27/1976 Make: Orlando Helicopter Airways, Inc. | Sikorsky Aircraft Corporation Model: HRS-1/CH-19 | HRS-3/H-19B | S-55 | S-55B | S-55C | S62A 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: 66-04-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2577 AD NUMBER: 66-04-03 SUBJECT HEADING: Airworthiness Directives; Sikorsky Models S-55 Series and S-62A Helicopters ACTION: SUMMARY: DATES: Effective April 27, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-04-03 SIKORSKY: Amdt. 39-194 Part 39 Federal Register February 12, 1966, as amended by Amendment 39-1563 is further amended by Amendment 39-2577. Applies to Models S-55 Series and S-62A Helicopters. Compliance required as indicated. To prevent operation with fatigue cracks in the spar of a main rotor blade, accomplish the following: (a) Except as provided in (e), remove from service S14-10-2100 series main rotor blades with 2,225 or more hours' time in service on the effective date of this AD within the next 25 hours' time in service. (b) Except as provided in (e), remove from service S14-10-2100 series main rotor blades with less than 2,225 hours' time in service on the effective date of this AD before the accumulation of 2,250 hours' time in service. (c) Except as provided in (e), remove from service S14-10-2201 series main rotor blades with 2,100 or more hours' time in service on the effective date of this AD within the next 150 hours' time in service. (d) Except as provided in (e), remove from service S14-10-2201 series main rotor blades with less than 2,100 hours' time in service on the effective date of this AD before the accumulation of 2,250 hours' time in service. (e) The service life limits specified in (a), (b), (c), and (d) may be extended to 6,000 hours' total time in service for S14-10-2201-9 main rotor blades and S14-10-2100 series and S14- 10-2201 series blades modified to S14-10-2201-9 blades, provided the blades are inspected at the times and in the manner set forth in Sikorsky Service Bulletin No. 55B10-7E dated March 26, 1976 or No. 62B10-6E dated March 26, 1976 or later FAA approved revisions, as applicable, and, if low pressure is indicated, the cause is determined and corrected before further flight in accordance with the applicable service bulletin. Amendment 39-194 became effective February 12, 1966. Amendment 39-1563 became effective November 30, 1972. This Amendment 39-2577 becomes effective April 27, 1976. 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.