Airworthiness directives › 2008-21-07R1
AD 2008-21-07R1 Airworthiness Directives; Dowty Propellers Propellers
Makes named: dowty. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Dowty Propellers model R408/6-123-F/17 propellers with blades, part numbers 697071200-18, 697071210-18, 697071227-18, 697071240-18, 697071245-18, or 697071257-18, installed.
Compliance
As optional terminating action to the repetitive inspection requirements of paragraph (e)(3) of this AD, modify the affected propeller using Dowty Propellers Service Bulletin (SB) No. D8400-61-70, Revision 3, dated June 3, 2013, or SB No. D8400-61-83, Revision 4, dated June 3, 2013, as applicable.
Required actions
The Manager, Boston Aircraft Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) Within the next 50 flight hours (FH) or within 30 days after the effective date of this AD, whichever occurs first, inspect all affected blade assemblies where the bonded metallic L/E guard has accumulated 1,200 FH time-in-service or less since installation, in accordance with the instructions of Dowty Propellers Alert Service Bulletin (ASB) No. D8400-61-A69, Revision 1, dated September 18, 2007. (2) Within 50 FH or 30 days, whichever occurs first, after installing a replacement blade, inspect the affected blade assembly where the bonded metallic L/E guard has accumulated 1,200 FH time-in-service or less since installation, in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69, Revision 1, dated September 18, 2007. (3) Thereafter, at intervals not to exceed 100 FH, repeat the inspection of the affected blade assemblies in accordance with the instructions of Dowty Propellers ASB No. D8400-61-A69, Revision 1, dated September 18, 2007, until the blade bonded metallic L/E guard has accumulated more than 1,200 FH time-in-service since installation. (4) If, during any of the inspections required by this AD, disbonding is found, apply the criteria in Appendix A of Dowty Propellers ASB No. D8400-61-A69, Revision 1, dated September 18, 2007 and, within the associated time period, repair or replace the affected blade assembly in accordance with Dowty Propellers ASB No. D8400-61-A69, Revision 1, dated September 18, 2007. (5) Blades that were repaired within the first 101.6 mm (4.0 inches) of the tip of the blade as specified in Appendix D of Dowty Propellers ASB No. D8400-61-A69, Revision 1, dated September 18, 2007, are eligible to continue in service for another 500 FH after accomplishment of the repair. Repair does not terminate the repetitive inspection requirements of paragraph (e)(3) of this AD.
Affected ADs
This AD replaces AD 2008-21-07, Amendment 39-15691 (73 FR 61346, October 16, 2008).
Read the original on the Federal Register →
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