Airworthiness directives › 2011-25-12
AD 2011-25-12 Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines
Applicability*9
This AD applies to Pratt & Whitney Canada PT6A-15AG, -27, -28, -34, -34AG, -34B, and -36 series turboprop engines that have had maintenance done to the power section module involving the first stage reduction sun gear or planetary gear set replacement since December 22, 2008, and having a: (1) Timken Alcor Aerospace Technologies, Inc. (TAATI) part manufacturer approval (PMA) replacement first stage reduction sun gear, part number (P/N) E3024765, serial numbers (S/Ns) PC5-051 through PC5-089, or S/Ns SG36-051 through SG36-120, installed; or (2) TAATI PMA replacement planetary gear set, P/N E3101455-02, S/Ns EE-051 through EE-197, or S/Ns EE-4051 through EE-4094, or S/N EE-4113, installed.
Compliance
(1) Within 10 operating hours after the effective date of this AD: (i) Inspect the chip detector on the propeller reduction gearbox assembly for metal debris. (ii) Do the inspections in accordance with paragraph 1 of the Accomplishment Instructions of Timken Alcor Aerospace Technologies, Inc. Alert Service Bulletin No. T-804, Revision B, dated November 7, 2011. If the amount of metal debris found exceeds the allowable limits then, before further flight, permanently remove from service the affected gears as specified in paragraph (g) of this AD. (2) Repeat the chip detector inspections within every 25 additional operating hours thereafter, until the affected gears are removed from service.
Required actions
Within 60 operating hours or 365 days after the effective date of this AD, whichever occurs first, permanently remove from service the PMA replacement TAATI first stage reduction sun gear and the interacting planetary gears, and the PMA replacement TAATI planetary gear sets and interacting gears, listed in paragraph (c) of this AD, from the propeller reduction gearbox assembly.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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