1AD/BELL 47/61 Amdt 23 - Retirement Life - Critical Components

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BELL 47/61 Amdt 22 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Bell Helicopter Textron 47 (All Variants) Series Helicopters

AD/BELL 47/61

Amdt 23

Retirement Life - Critical Components 1/2004

DM

Applicability: All Bell 47 and Kawasaki 47 models.

Requirement: All components listed in the following references, as applicable to each helicopter model, shall be retired from service at or before the times quoted therein, with the exceptions and additions specified in this Directive.

For 47D-1, 47G and 47G-2 Series:

(a) Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 15 August 1969 incorporating Revision No. 4, dated 1 June 1975.

(b) Bell Service Bulletin 47-05-73-1, Revision A.

(c) Bell Service Bulletin 47-76-3, Revision A.

2. For 47G-3B and 47G-3B-1 Series: Airworthiness Limitations Schedule, Bell Maintenance and Overhaul Instructions dated 1 June 1965 incorporating Revision No. 9 dated 1 June 1981.

3. For Kawasaki Model 47G3B-KH4: Maintenance and Overhaul Instruction Manual, Section 1 \- Mandatory Retirement Schedule, page 1-56, as revised March 10, 1997.

4. For 47G-3B-2 Series: Airworthiness Limitations Schedule, Bell Maintenance and Overhaul Instructions dated 15 January 1968 incorporating Revision No. 9 dated 1 July 1981.

5. For 47G-3B-2A Series: Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 1 July 1974 incorporating Revision No. 4 dated 31 May 1978.

6. For 47G-4 and 47G-4A Series: Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 1 May 1966 incorporating Revision No. 7 dated 1 June 1981.

7. For 47G-5 Series: Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 1 May 1966 incorporating Revision No. 6 .

8. For 47G-5A Series: Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 1 December 1971 incorporating Revision No. 8 dated 15 May 1981.

9. For 47J Series: Mandatory Retirement Schedule, Bell Maintenance and Overhaul Instructions dated 1 November 1965 incorporating Revision No. 5 dated 1 November 1974.

10. For 47J-2 and 47J-2A Series: Mandatory Retirement Bell Maintenance and Overhaul Instructions dated 1 March 1964 incorporating Revision No. 7 dated 15 July 1981.

11. For all models, replace P/N 47-642-102 tail rotor blades with improved blades P/N 47-642-117 prior to 1 July 1981.

12. For aircraft fitted with Texas Helicopter Corporation modified control system in accordance with US FAA STC SH2772SW, the retirement life for the weld assembly P/N 74-150-117-13M shall be 5000 hours.

13. For aircraft re-engined in accordance with US FAA STC SH657NW (held by Siam Hiller Holdings, Inc.), the retirement lives of the Adapter plate (P/N Soloy 660-2101), Drive shaft (P/N Soloy 660-2408) and Engine Mount (P/N Bell 47- 612-171-123) shall be as specified in US FAA STC SH657NW as amended 30 June 1999.

14. Retire tail rotor yokes P/N 74-641-057-9 from service before 1 January 1987.