AD/Dauphin/68 Amdt 2 Main Gearbox Base Plate (Cth)
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/DAUPHIN/68 Amdt 1 and issues the following AD under subregulation 39.001(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.
Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters
| AD/DAUPHIN/68 Amdt 2 | Main Gearbox Base Plate | 6/2008 |
Applicability: | All SA 365 N, N1, and AS 365 N2, N3 helicopters, all serial numbers, equipped with a main gearbox base plate before embodiment of MOD 0763C45. |
Requirement: | 1. On SA 365 N, N1, helicopter versions: a. Equipped with a MGB that has logged less than 9,900 flight cycles and has never been overhauled or repaired: - Action in accordance with paragraph 2.B. of Eurocopter Alert Service Bulletin (ASB) 05.00.45 R1 or latter approved revision. b. Equipped with a MGB that has logged 9,900 or more flight cycles, and has never been overhauled or repaired: - Action in accordance with paragraph 2.B. of ASB 05.00.45 R1 or latter approved revision. c. Equipped with a newly overhauled or newly repaired MGB: - Action in accordance with paragraph 2.B. of ASB 05.00.45 R1 or latter approved revision. 2. On AS 365 N2, N3, helicopter versions: a. Equipped with a MGB that has logged less than 7,300 flight cycles and has never been overhauled or repaired: - Action in accordance with paragraph 2.B. of ASB 05.00.45 R1 or latter approved revision. b. Equipped with a MGB that has logged 7,300 or more flight cycles and has never been overhauled or repaired: - Action in accordance with paragraph 2.B. of ASB 05.00.45 R1 or latter approved revision. |
| c. Equipped with a newly overhauled or newly repaired MGB: - Action in accordance with paragraph 2.B. of ASB 05.00.45 R1 or latter approved revision. Note: EASA AD 2006-0101 refers. | |
Compliance: | 1. a. Upon accumulating 9,900 flight cycles. Thereafter at intervals not to exceed 55 flight hours. b. At the next ALF-check (after the last flight of the day check) after c. At the next ALF-check after 18 February 2004. Thereafter at intervals not to exceed 55 flight hours. 2. a. Upon accumulating 7,300 flight cycles. Thereafter at intervals not to exceed 55 flight hours. b. At the next ALF-check after 18 February 2004. Thereafter at intervals not to exceed 55 flight hours. c. At the next ALF-check after 18 February 2004. Thereafter at intervals not to exceed 55 flight hours. The compliance times remain unchanged by this issue of the Directive. |
| This Amendment becomes effective on 5 June 2008. | |
Background: | A crack was discovered on the main gearbox (MGB) base plate of an AS 365 N2 helicopter. The crack was detected in the MGB base plate, close to the attachment of one of the laminated pads, running to the inside of the MGB base plate and then to the MGB casing. Undetected crack growth could lead to the loss of rotor torque-to-structure transfer function. Amendment 1 replaced the previous AOT Requirement documents with ASB Requirement documents, with no change to technical content; and extended the repeat inspection intervals. Amendment 2 is issued to introduce the current EASA AD related to this Directive, which clarifies helicopter applicability; with no change to technical requirements. |
| The original issue of this Airworthiness Directive became effective on |
David Villiers
Delegate of the Civil Aviation Safety Authority
15 April 2008
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