AD 90-01-08
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD Helicopters, Inc. | 369 | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369A | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369D | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369E | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369F | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369FF | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369H | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369HE | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369HM | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
| aircraft | MD Helicopters, Inc. | 369HS | Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) |
Unsafe Condition
Failure of the engine-to-transmission driveshaft coupling, specifically MDHC Part Number 369H5660 with serial numbers 5200 through 5309, could result in loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect couplings (MDHC P/N 369H5660) to determine serial numbers within 25 hours' time in service or 120 days after the effective date. Replace couplings with serial numbers 5200-5309 using airworthy parts. Record compliance and serial numbers of deficient couplings in AD and maintenance records.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours' time in service or within 120 days after the effective date of the AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 series helicopters including Models YOH-6A and OH-6A, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Driveshaft Coupling
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_90-01-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-01-08 Document Type: AD Final Rules Docket Number: 89-ASW-10 Subject Heading: Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (...Show more Subject: Driveshaft Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/05/1990 Make: MD Helicopters, Inc. Model: 369 | 369A | 369D | 369E | 369F | 369FF | 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: 90-01-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 89-ASW-10 AMENDMENT: 39-6456 AD NUMBER: 90-01-08 SUBJECT HEADING: Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) ACTION: SUMMARY: DATES: Effective February 5, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-01-08 MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC): Amendment 39-6456. Docket No. 89-ASW-10. Applicability: Model 369 series helicopters (including Models YOH-6A and OH-6A) certificated in any category. Compliance: Required as indicated, unless already accomplished. To prevent possible failure of the engine-to-transmission driveshaft coupling, which could result in loss of control of the helicopter, accomplish the following: (a) Within the next 25 hours' time in service or within 120 days after the effective date of the AD, whichever occurs first, inspect the couplings, MDHC Part Number (P/N) 369H5660, to determine serial numbers. (b) Replace any couplings, P/N 369H5660, which have serial numbers in the range from 5200 through 5309, with airworthy parts. (c) Record compliance with paragraph (a) of this AD in the AD compliance record and in the maintenance record of the helicopter log book. This record must include the serial numbers of any deficient couplings found during compliance with this AD. NOTE: MDHC Service Information Notices HN-216, DN-157, EN-47, FN-35, dated April 5, 1989, pertain to this subject. (d) In accordance with FAR Sections 21.197 and 21.199, flight is permitted to a base where the requirements of this AD may be accomplished. (e) An alternate method of compliance or adjustment of the compliance time which provides an equivalent level of safety, may be used if approved by the Manager, Los Angeles Aircraft Certification Office, ANM-100L, FAA, 3229 East Spring Street, Long Beach, California 90806-2425. NOTE: Unairworthy couplings removed from service and in spares inventory should be marked unairworthy. Unairworthy couplings should be purged from spares inventory in accordance with MDHC SIN HN-216, DN-157, EN-47, FN-35, dated April 5, 1989. This amendment (39-6456, AD 90-01-08) becomes effective on February 5, 1990. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_90-01-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 90-01-08 Document Type: AD Final Rules Docket Number: 89-ASW-10 Subject Heading: Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (...Show more Subject: Driveshaft Coupling Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/05/1990 Make: MD Helicopters, Inc. Model: 369 | 369A | 369D | 369E | 369F | 369FF | 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: 90-01-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 89-ASW-10 AMENDMENT: 39-6456 AD NUMBER: 90-01-08 SUBJECT HEADING: Airworthiness Directives: MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC) Model 369 Series Helicopters (including Models YOH-6A and OH-6A) ACTION: SUMMARY: DATES: Effective February 5, 1990. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 90-01-08 MCDONNELL DOUGLAS HELICOPTER COMPANY (MDHC): Amendment 39-6456. Docket No. 89-ASW-10. Applicability: Model 369 series helicopters (including Models YOH-6A and OH-6A) certificated in any category. Compliance: Required as indicated, unless already accomplished. To prevent possible failure of the engine-to-transmission driveshaft coupling, which could result in loss of control of the helicopter, accomplish the following: (a) Within the next 25 hours' time in service or within 120 days after the effective date of the AD, whichever occurs first, inspect the couplings, MDHC Part Number (P/N) 369H5660, to determine serial numbers. (b) Replace any couplings, P/N 369H5660, which have serial numbers in the range from 5200 through 5309, with airworthy parts. (c) Record compliance with paragraph (a) of this AD in the AD compliance record and in the maintenance record of the helicopter log book. This record must include the serial numbers of any deficient couplings found during compliance with this AD. NOTE: MDHC Service Information Notices HN-216, DN-157, EN-47, FN-35, dated April 5, 1989, pertain to this subject. (d) In accordance with FAR Sections 21.197 and 21.199, flight is permitted to a base where the requirements of this AD may be accomplished. (e) An alternate method of compliance or adjustment of the compliance time which provides an equivalent level of safety, may be used if approved by the Manager, Los Angeles Aircraft Certification Office, ANM-100L, FAA, 3229 East Spring Street, Long Beach, California 90806-2425. NOTE: Unairworthy couplings removed from service and in spares inventory should be marked unairworthy. Unairworthy couplings should be purged from spares inventory in accordance with MDHC SIN HN-216, DN-157, EN-47, FN-35, dated April 5, 1989. This amendment (39-6456, AD 90-01-08) becomes effective on February 5, 1990. 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.