Airworthiness directives › 2018-17-13
AD 2018-17-13 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Tay 620-15 Engines
Applicability*9
This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) Tay 620-15 turbofan engines with low-pressure compressor (LPC) fan blades, having part numbers (P/Ns) JR30649, JR31702, JR31983, JR33863, or JR33864, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 30 days after the effective date of this AD, determine the number of dry-film lubricant (DFL) treatments that were applied to the LPC fan blade by reviewing the maintenance records or using an alternative method in steps C or N, as applicable, of the Accomplishment Instruction, paragraph 3, of RRD ALERT Non-Modification Service Bulletin (NMSB) TAY-72-A1834, dated November 17, 2017. (2) Depending on the results of the records review, do the following, as applicable: (i) If the number of DFL treatments is fewer than 13, mark the LPC fan blade dovetail root with a suffix code during the next scheduled LPC fan blade removal using steps H or R, as applicable, of the Accomplishment Instruction, paragraph 3, of RRD ALERT NMSB TAY-72-A1834, dated November 17, 2017. (ii) If the number of DFL treatments is 13 or more, replace the affected LPC fan blade with a part eligible for installation within 500 flight hours after effective date of this AD.
Unsafe condition
This AD was prompted by reports of LPC fan blade retention lug failures. We are issuing this AD to prevent failure of the LPC fan blade retention lug. The unsafe condition, if not addressed, could result in loss of engine thrust control and reduced control of the airplane.
Affected ADs
None.
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