Federal Aviation Administration June 19, 2015 – Federal Register Recent Federal Regulation Documents

The FAA is withdrawing a notice of proposed rulemaking (NPRM). The NPRM proposed a new airworthiness directive (AD) that had applied to AlliedSignal oil scavenge pumps, part numbers (P/Ns) 101633-01 and - 02 and Rajay Inc. oil scavenge pumps, P/Ns 1025-1 and -2 installed on Continental Motors, Inc. (CMI) IO-470 and TSIO-520 reciprocating engines and on Lycoming Engines, Inc., (Lycoming) IO-360, IO-540, and O-360 reciprocating engines. We have found no service difficulties with these model oil scavenge pumps when installed on the affected engines. Accordingly, we withdraw the proposed rule.

We propose to adopt a new airworthiness directive (AD) for certain Pratt & Whitney Canada Corp. (P&WC) PT6B-37A turboshaft engines. This proposed AD was prompted by reports of incorrect engine torque for PT6B-37A engines. This proposed AD would require initial and repetitive inspections until replacement of the No. 10 bearing, and eventual replacement of the No. 9 bearing, both located in the engine reduction gearbox (RGB) assembly. We are proposing this AD to prevent axial migration of the No. 10 bearing in the engine RGB assembly, which could lead to engine overtorque, failure of the engine, in-flight shutdown, and loss of the rotorcraft.