AD/PR/37 Amdt 1 Propeller Blades Metallic Leading Edge Guard (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/PR/37 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.
Propellers - Variable Pitch - Dowty Rotol
| AD/PR/37 Amdt 1 | Propeller Blades - Metallic Leading Edge Guard | 13/2007 |
Applicability: | All R408/6-123-F/17 propellers equipped with blade assemblies Part Number (P/N) 697071200-18, 697071210-18, 697071227-18, 697071240-18, 697071245-18 and 697071257-18, where the bonded metallic leading edge guard has accumulated 1,200 Flight Hours (FH) or less since installation. Note 1: These propellers are known to be installed on, but not limited to, Bombardier Inc. (formerly de Havilland Canada) Models DHC-8-400, DHC-8-401 and |
Requirement: | 1. Inspect the blade assemblies where the bonded metallic L/E guard has accumulated 1,200 FH or less since installation, in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69 or later approved revision. 2. Inspect the blade assembly where the bonded metallic L/E guard has accumulated 1,200 FH or less since installation, in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69 or later approved revisions. 3. Repeat the inspection of the blade assemblies in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69 or later approved revisions until the bonded blade L/E guard has accumulated more than 1,200 FH since installation. 4. Repair or replace the affected blade assembly, as necessary, in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69 Revision 1 or later approved revision. Blades that have been repaired within the first 101.6 mm of the tip of the blade s specified in Appendix D of the referenced ASB are allowed to continue in service for another 500 FH after accomplishment of the repair. Repair does not terminate the repetitive inspections detailed in Requirement 3 of this AD. Note 2: EASA AD 2007-0223R2 dated 26 October 2007 refers. |
Compliance: | 1. Within the next 50 FH or within 1 month after the effective date of this AD, whichever occurs first, unless previously accomplished. |
| 2. Within 50 FH or 1 month after installing a replacement blade. 3. After the inspection as detailed by Requirement (1) or (2) of this AD, as applicable, at intervals not to exceed 100 FH. 4. When, during any of the inspections as detailed by Requirements (1), (2) or (3) of this AD, disbonding is found, within the time period as determined by applying the criteria as indicated in Appendix A of Dowty Propellers ASB No. | |
| This Amendment becomes effective on 20 December 2007. | |
Background: | Three in-service propellers have been found to have blades which have lost the bonded metallic leading edge guard. If the leading edge guard comes off as the propeller turns, it could cause secondary damage to aircraft or injury to personnel. For the reasons described above, EASA issued Emergency AD 2007-0223-E to require repetitive inspections of the blade Leading Edge (L/E) guards for correct bonding until they accumulate more than 1,200 FH time in service. This AD has now been revised to: (1) clarify the required inspections of spare or new blades installed as replacement part, prior to accumulating 1,200 FH time in service; (2) clarify the follow-up required actions depending on findings during the inspections; and (3) to make reference to the latest Dowty Alert Service Bulletin (ASB) revision. |
David Punshon
Delegate of the Civil Aviation Safety Authority
25 October 2007
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