Airworthiness Directive · Amendment 39-14342 · Bell Helicopter Textron Model 47D1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A and Coastal Helicopters, Inc. Model OH-13H (Tomcat Mark 5A, 6B, 6C) Helicopters
Bell Helicopter Textron Model 47D1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A and Coastal Helicopters, Inc. Model OH-13H (Tomcat Mark 5A, 6B, 6C) Helicopters
The following helicopter models with the referenced Texas Helicopter Co., Inc. (THC) scissors assembly part number (P/N) or weld assembly scissors bracket P/N installed as a Parts Manufacturer Approval (PMA) replacement part or as part of the modification in accordance with Supplemental Type Certificate (STC) No. SH2772SW, certificated in any category.
| Model | With scissors assembly P/N | Or weld assembly scissors bracket P/N |
|---|---|---|
| (1) Bell Model 47D1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A; and | 74-150-949-9 or 74-150-949-5 or 74-150-249-5M | 74-150-117-13M. |
| (2) CHI OH-13H (Tomcat Mark 5A, 6B, or 6C) |
This amendment adopts a new airworthiness directive (AD) for Bell Helicopter Textron (Bell) Model 47D1, 47G, 47G-2, 47G-2A, 47G-2A- 1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A and Coastal Helicopters, Inc. Model OH-13H (Tomcat Mark 5A, 6B, 6C) helicopters that have a certain scissors assembly or weld assembly scissors bracket installed. The AD requires, within 60 days, determining and recording the total hours time-in-service (TIS) for each Parts Manufacturer Approval (PMA)-produced scissors assembly and weld assembly scissors bracket and establishes a life limit for each affected part. This amendment is prompted by the need to establish a life limit on scissors assemblies and weld assembly scissors brackets produced under PMA No. PQ808SW or installed per Supplemental Type Certificate (STC) No. SH2772SW. The actions specified by this AD are intended to establish a life limit to prevent using a scissors assembly or weld assembly scissors bracket past it's life limit, which could result in failure of the part and subsequent loss of control of the helicopter.
To prevent using a scissors assembly or weld assembly scissors bracket past it's life limit, which could result in failure of the part and subsequent loss of control of the helicopter, accomplish the following:
(a) Within 60 days, determine and record on the service record or equivalent record the total hours time-in-service (TIS) of each affected part. If the TIS hours cannot be determined, replace the part with an airworthy part with known hours TIS before further flight.
(b) Thereafter, replace each affected part before it accumulates 5,000 hours TIS.
Note: Texas Helicopter Co., Inc. Service Bulletin No. SB 003, dated December 1, 2002, pertains to the subject of this AD.
(c) This AD establishes a life limit of 5,000 hours TIS for each affected PMA-produced scissors assembly and each affected PMA-produced weld assembly scissors bracket.
(d) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Rotorcraft Certification Office, Rotorcraft Directorate, FAA, for information about previously approved alternative methods of compliance.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
