Airworthiness directives › 2010-17-11R2
AD 2010-17-11R2 Airworthiness Directives; Dowty Propellers Constant Speed 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 R408/6-123-F/17 model propellers with a hub, actuator, and backplate assembly line-replaceable unit (LRU) serial number (S/N) below DAP0927.
Compliance
After the effective date of this AD, do not install any Dowty Propellers R408/6-123-F/17 model propeller unless 3M 5300 or 3M 4200 sealant was applied between the bus bar assembly and the backplate assembly as required by this AD, or unless the optional terminating action as specified in paragraph (g) of this AD was performed.
Required actions
As optional terminating action to the sealant application required by paragraph (e) of this AD, replace the bus bar assembly with a slip ring de-icer harness. Use paragraph 3.A. of the Accomplishment Instructions of Dowty Propellers Service Bulletin (SB) No. D8400-61-94, Revision 6, dated December 12, 2013, to do the replacement.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) For R408/6-123-F/17 model propellers with a hub, actuator, and backplate assembly LRU S/N below DAP0347, do the following initial sealant application within 5,000 flight-hours (FHs) after September 27, 2010, or within 100 FHs after the effective date of this AD, whichever occurs later: (i) Apply a sealant specified in Dowty Propellers Alert Service Bulletin (ASB) No. D8400-61-A66, Revision 8, dated October 31, 2013 between the bus bar assemblies and the backplate assembly. (ii) Use paragraph 3.A. or 3.B. of the Accomplishment Instructions of Dowty Propellers ASB No. D8400-61-A66, Revision 8, dated October 31, 2013, to apply the sealant. (2) Thereafter, for R408/6-123-F/17 model propellers, with a hub, actuator, and backplate assembly LRU S/N below DAP0927, re-apply sealant as specified in paragraphs (e)(1)(i) and (e)(1)(ii) of this AD within every additional 10,500 FHs.
Affected ADs
This AD revises AD 2010-17-11R1, Amendment 39-17481 (78 FR 41283, July 10, 2013).
Read the original on the Federal Register →
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