AD/DHC-1/22 Amdt 3 Tailplane Structure (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/DHC-1/22 Amdt 2 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.
De Havilland DHC-1 (Chipmunk) Series Aeroplanes
| AD/DHC-1/22 Amdt 3 | Tailplane Structure | 11/2008 |
Applicability: | All English production aircraft which have not been modified in accordance with a scheme approved by the Authority. |
Requirement: | Inspect the tailplane upper and lower spar flanges in accordance with British Aerospace Technical News Sheet (TNS) CT(C1) No. 157, Issue 3, Amendment dated 28 May 1986. Note: TNS No. 138 issue 5 is the subject of UK CAA AD 2804 PRE 80 and |
Compliance: | From the date of compliance with the initial inspection required by the previous issue of this directive, repeat the inspections of paragraph 8 of the TNS at intervals not exceeding 6 years, unless the aircraft is operated on a Role Factor of 4 (see British Aerospace Technical News Sheet (TNS) CT(C1) No. 138 issue 5), in which case the inspection interval shall not exceed 3 years. |
| This Amendment becomes effective on 23 October 2008. | |
Background: | This amendment removes reference to compliance statement requiring an inspection no later than the next major inspection after 31 December 1985. This inspection would have been carried out by now and the legislative requirement for major inspections no longer exists. This amendment requires repetitive radiographic inspection of the tailplane upper and lower spar flanges at the fuselage attachment brackets. Some aircraft have been modified to incorporate a locally developed reinforcement kit. This amendment takes the opportunity to update and amend TNS references and introduce reference to State of manufacture and Australian directives. No additional work is required as a result of this amendment. The initial issue of this directive became effective on 29 October 1971. Amendment 1 became effective on 30 November 1985 and introduced a radiographic inspection of the tailplane front spar joints. It also required a repeat of the inspections originally carried out in accordance with the initial issue of this AD. |
| Amendment 2 to this AD became effective on 13 July 2000. Amendment 2 excluded modified aircraft from the requirement. |
David Villiers
Delegate of the Civil Aviation Safety Authority
8 September 2008
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