# AD 86-01-04: Tail Rotor Blades - Type: Airworthiness directive - Status: Current - Products: MD Helicopters 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM and 369HS - Effective: February 14, 1986 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Rotorcraft - Amendment: 39-5187 - Registered aircraft: 614 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/85E1016F7FD1299B86256A4E0048893E.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/86-01-04 ## The airworthiness directive 86-01-04 HUGHES HELICOPTERS, INC. (Hughes Helicopters): Amendment 39-5187. Applies to Model 369 series helicopters including military Models YOH-6A and OH-6A, certificated in any category, equipped with tail rotor blades Part Numbers (P/N) 369A1613-3,- 7, -501, and -503, Serial Numbers (S/N) 6928 and prior; P/N's 369D21613-11, -41, and -51, S/N's 5144 and prior; P/N 369D21606, S/N's 0077 and prior; P/N 369D21615, S/N's 0480 and prior; and P/N's 421-088-BSC and -3, all serial numbers. Compliance is required within the next 100 hours time in service after the effective date of this AD, unless already accomplished. To prevent the loss of a tail rotor blade tip cap in flight and subsequent loss of tail rotor control, accomplish the following: (a) Remove, inspect, and modify blades in accordance with paragraphs a through g, Part I "PROCEDURE" section of Hughes Service Information Notices (SIN) DN-132.1, EN-21.1, FN-9.1, HN-199.1 dated May 1, 1985, or SIN's DN-129, EN-18,and HN-195 dated August 27, 1984. (b) An alternate method of compliance which provides an equivalent level of safety may be used when approved by the Manager of the Western Aircraft Certification Office, Hawthorne, California. (c) Special flight permits may be issued in accordance with FAR Sections 21.197 and 21.199 to ferry aircraft to a maintenance base in order to comply with the requirements of this AD. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to McDonnell Douglas Helicopter Company, Centinela Avenue and Teale Street, Culver City, California 90230. These documents also may be examined at the FAA, Southwest Region, Room 158, Building 3B, 4400 Blue Mound Road, Fort Worth, Texas 76106, or at the Western Aircraft Certification Office, 15000 Aviation Boulevard, Hawthorne, California 90250. This amendment supersedes Amendment 39-4940 (49 FR 43046; October 26, 1984), AD 84-18-08. This amendment becomes effective February 14, 1986. ## 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/86-01-04/models.md Every aircraft: https://openairdocs.org/ad/86-01-04/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.