Airworthiness Directive · Amendment 39-19367 · Turbine engine compressor section
Rolls-Royce Deutschland Ltd & Co KG Tay 620-15 Engines
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.
We are adopting a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Tay 620-15 turbofan engines. This AD was prompted by reports of low-pressure compressor (LPC) fan blade retention lug failures. This AD requires reviewing the engine maintenance records and replacing the LPC fan blade with a part eligible for installation if the dry-film lubricant (DFL) treatment limit is exceeded. We are issuing this AD to address the unsafe condition on these products.
(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.
After the effective date of this AD, do not install an affected LPC fan blade on any engine unless it has been determined that the LPC fan blade has had fewer than 13 DFL treatments and has been marked in accordance with the instructions of RRD ALERT NMSB TAY-72-A1834, dated November 17, 2017.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
