AD/J4100/2 Nose Landing Gear Capsule (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (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.
BAe Systems (Operations) Jetstream 4100 Series Aeroplanes
| AD/J4100/2 | Nose Landing Gear Capsule | 4/2008 DM |
Applicability: | Jetstream Aircraft Ltd, British Aerospace Regional Aircraft Ltd, British Aerospace (Operations) Ltd and British Aerospace (Commercial Aircraft) Ltd. Jetstream 4100 Series aeroplanes. |
Requirement: | 1. Carry out an initial inspection of the Nose Landing Gear (NLG) capsule in accordance with Paragraph 2B of SB J41-A32-082 Revision 2 or later approved revision. 2. If the check for free movement of the capsule is not satisfactory, remove the NLG and install a serviceable unit and inspect in accordance with Paragraph 2.B. of Service Bulletin J41 -A32-082 Revision 2 or later approved revision. 3. Repeat the actions detailed in Requirements 1 and 2 of this AD. 4. Modify the aircraft in accordance with Paragraph 2.B. of Service Bulletin Paragraph 2.B, of Service Bulletin J41-A32-084 Revision 0 requires a check for free movement of the capsule, this is to be performed in accordance with Paragraph 2B of SB J41-A32-082 rev 2 or later approved revision. Note: EASA AD 2006-0131 dated 18 May 2006 refers. |
Compliance: | 1. Prior to exceeding the greater of either: 400 flight hours since the AD effective date or 800 flight hours from the last inspection in accordance with SB 2. Before further flight after the effective date of this AD. 3. For aircraft without Service Bulletin J41-A32-084 Revision 0 or later approved revision embodied, (Modification JM41670), repeat at an interval not exceeding 800 flight hours. For aircraft with Service Bulletin J41-A32-084 Revision 0 or later approved revision embodied, (Modification JM41670), repeat at an interval not exceeding 3000 flight hours. |
| 4. Within 30 days after the effective date of this AD; where there is a need to fit a replacement gear to an aircraft; or Prior to 30 June 2012, whichever occurs first after the effective date of this AD. | |
| This Airworthiness Directive becomes effective on 20 February 2008. | |
Background: | Service Bulletin J41-A32-082 revision 1 was issued following two incidents where the nose landing gear failed to fully extend. Repeat inspections of the NW shortening mechanism where required to detect binding at the capsule bearings. Following a third incident in 2005 where the nose landing gear failed to fully extend on an aircraft that had been inspected in accordance with J41-A32-082 rev 1, a review identified that changes were necessary to ensure the inspection would detect NLG assemblies at risk of seizure. The changes comprise a modified ‘freefall’ test and a reduced repeat inspection frequency, these being introduced in revision 2 of the SB. This AD is required to fully address the unsafe condition previously identified. In addition, modification JM41670 (Service Bulletin J41-32-084) has been developed. This installs a nose landing gear with modified bearings and lubrication provisions in the shortening mechanism. Embodiment of this modification also allows a revised inspection frequency. |
David Punshon
Delegate of the Civil Aviation Safety Authority
14 February 2008
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