# AD 90-01-08: Driveshaft Coupling - Type: Airworthiness directive - Status: Current - Products: MD Helicopters 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM and 369HS - Effective: February 5, 1990 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Rotorcraft - Amendment: 39-6456 - Docket: 89-ASW-10 - Registered aircraft: 614 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3AA78502421A29C086256A4D0063F024.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/90-01-08 ## The airworthiness directive 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. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS H3WE](https://openairdocs.org/tcds/H3WE): MD Helicopters LLC; names 10 of 12 models: 369D, 369E, 369F, 369FF, 369HS, 369HM, 369HE, 369H… ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 614 (614 by airframe model, 0 by engine model) - Makers: Hughes Helicopters 241, MD Helicopters 142, Hughes 123, Mcdonnell Douglas Helicopter 83, Mcdonnell Douglas Heli 17, Summa 5, Hughes/Batto John 1, Hughes/Helicopter Assocs 1, Mcdonnell Douglas Mdhs 1 Models with the most aircraft: - [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d): 207 aircraft (airframe model) - [MD Helicopters 369FF](https://openairdocs.org/model/md-helicopters-369ff): 94 aircraft (airframe model) - [Mcdonnell Douglas Helicopter 369E](https://openairdocs.org/model/mcdonnell-douglas-helicopter-369e): 83 aircraft (airframe model) - [Hughes 369HS](https://openairdocs.org/model/hughes-369hs): 69 aircraft (airframe model) - [MD Helicopters 369E](https://openairdocs.org/model/md-helicopters-369e): 42 aircraft (airframe model) - [Hughes 369A](https://openairdocs.org/model/hughes-369a): 32 aircraft (airframe model) - [Hughes Helicopters 369E](https://openairdocs.org/model/hughes-helicopters-369e): 29 aircraft (airframe model) - [Mcdonnell Douglas Heli 369FF](https://openairdocs.org/model/mcdonnell-douglas-heli-369ff): 17 aircraft (airframe model) - [Hughes 369A (OH-6A)](https://openairdocs.org/model/hughes-369a-oh-6a): 11 aircraft (airframe model) - [Hughes 369](https://openairdocs.org/model/hughes-369): 5 aircraft (airframe model) - [Hughes Helicopters 369FF](https://openairdocs.org/model/hughes-helicopters-369ff): 5 aircraft (airframe model) - [Summa 369D](https://openairdocs.org/model/summa-369d): 4 aircraft (airframe model) - [MD Helicopters 369HS](https://openairdocs.org/model/md-helicopters-369hs): 3 aircraft (airframe model) - [Hughes 369HE](https://openairdocs.org/model/hughes-369he): 3 aircraft (airframe model) - [MD Helicopters 369HM](https://openairdocs.org/model/md-helicopters-369hm): 2 aircraft (airframe model) - [Hughes 369F](https://openairdocs.org/model/hughes-369f): 2 aircraft (airframe model) - [Summa 369HS](https://openairdocs.org/model/summa-369hs): 1 aircraft (airframe model) - [MD Helicopters 369A](https://openairdocs.org/model/md-helicopters-369a): 1 aircraft (airframe model) - [Mcdonnell Douglas Mdhs 369E](https://openairdocs.org/model/mcdonnell-douglas-mdhs-369e): 1 aircraft (airframe model) - [Hughes/Helicopter Assocs 369A](https://openairdocs.org/model/hughes-helicopter-assocs-369a): 1 aircraft (airframe model) All 24 models: https://openairdocs.org/ad/90-01-08/models.md Every aircraft: https://openairdocs.org/ad/90-01-08/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.