AD 70-16-07
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369 | Airworthiness Directives; Hughes Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369A | Airworthiness Directives; Hughes Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369H | Airworthiness Directives; Hughes Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HE | Airworthiness Directives; Hughes Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HM | Airworthiness Directives; Hughes Model 369 Series Helicopters |
| aircraft | MD Helicopters, Inc. | 369HS | Airworthiness Directives; Hughes Model 369 Series Helicopters |
Unsafe Condition
Failure of the main rotor blade P/N 369A1100 and P/N 369A1100-501 due to cracks or doubler peeling or separation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine identification notation on blade top and bottom doublers per Hughes Service Information Notice No. HN-8. Inspect blades with 'PR-12' stamps or lacking stamps before further flight, addressing cracks or separation. Repeat inspections every 25 hours until 100 hours post-AD effective date. Remove blades from service after 100 hours time in service from AD effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hughes Model 369 Series helicopters with main rotor blades P/N 369A1100 and P/N 369A1100-501, serial numbers listed in Hughes Service Information Notice No. HN-8 (November 19, 1969) or later FAA approved revision, and OH-6A Information Notices 120, 120A, 120B.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Rotor Blade
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-16-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-16-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hughes Model 369 Series Helicopters Subject: Main Rotor Blade Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/08/1970 Make: MD Helicopters, Inc. Model: 369 | 369A | 369H | 369HE | 369HM | 369HS 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: 70-16-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1059 AD NUMBER: 70-16-07 SUBJECT HEADING: Airworthiness Directives; Hughes Model 369 Series Helicopters ACTION: SUMMARY: DATES: Effective August 8, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-16-07 HUGHES: Amendment 39-1059. Applies to Model 369 Series helicopters, certificated in all categories, which incorporate P/N 369A1100 and P/N 369A1100-501 main rotor blade serial numbers listed in Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision and serial numbers listed in OH-6A Information Notice Numbers, 120, 120A, and 120B dated October 24, 1969; November 5, 1969; and December 19, 1969, respectively. Compliance required as indicated: To prevent failure of the main rotor blade P/N 369A1100 and P/N 369A1100-501 accomplish the following or an equivalent inspection procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region: Within 25 hours time in service after the effective date of this AD, unless already accomplished, determine the identification notation on the blade top and bottom doublers in accordance with the procedures in Part I a, b, and c of Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision. (a) For blades displaying "PR-12" ink stamps or blades lacking ink stamps below the part number on either of the doublers: (1) Inspect prior to further flight in accordance with Part I d of Hughes Service Information Notice No. HN-8, above. (2) If indications of cracks or doubler peeling or separation are found, remove the blade from service prior to further flight. (3) If indications of cracks or doubler peeling or separation are not found, repeat the inspection required under (1) above, at periods not to exceed 25 hours time in service from the last inspection until the blades are removed from service as specified in (4), below. (4) Remove from service prior to the accumulation of 100 hours time in service from the effective date of this AD. (b) Blades displaying ink stamp letters and numerals other than "PR-12" below the part number on both doublers may be returned to service with no further inspection, following refinishing and identification per Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision. This amendment becomes effective August 8, 1970. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_70-16-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-16-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Hughes Model 369 Series Helicopters Subject: Main Rotor Blade Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/08/1970 Make: MD Helicopters, Inc. Model: 369 | 369A | 369H | 369HE | 369HM | 369HS 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: 70-16-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1059 AD NUMBER: 70-16-07 SUBJECT HEADING: Airworthiness Directives; Hughes Model 369 Series Helicopters ACTION: SUMMARY: DATES: Effective August 8, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-16-07 HUGHES: Amendment 39-1059. Applies to Model 369 Series helicopters, certificated in all categories, which incorporate P/N 369A1100 and P/N 369A1100-501 main rotor blade serial numbers listed in Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision and serial numbers listed in OH-6A Information Notice Numbers, 120, 120A, and 120B dated October 24, 1969; November 5, 1969; and December 19, 1969, respectively. Compliance required as indicated: To prevent failure of the main rotor blade P/N 369A1100 and P/N 369A1100-501 accomplish the following or an equivalent inspection procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region: Within 25 hours time in service after the effective date of this AD, unless already accomplished, determine the identification notation on the blade top and bottom doublers in accordance with the procedures in Part I a, b, and c of Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision. (a) For blades displaying "PR-12" ink stamps or blades lacking ink stamps below the part number on either of the doublers: (1) Inspect prior to further flight in accordance with Part I d of Hughes Service Information Notice No. HN-8, above. (2) If indications of cracks or doubler peeling or separation are found, remove the blade from service prior to further flight. (3) If indications of cracks or doubler peeling or separation are not found, repeat the inspection required under (1) above, at periods not to exceed 25 hours time in service from the last inspection until the blades are removed from service as specified in (4), below. (4) Remove from service prior to the accumulation of 100 hours time in service from the effective date of this AD. (b) Blades displaying ink stamp letters and numerals other than "PR-12" below the part number on both doublers may be returned to service with no further inspection, following refinishing and identification per Hughes Service Information Notice No. HN-8, dated November 19, 1969, or later FAA approved revision. This amendment becomes effective August 8, 1970. 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.