The FAA is superseding emergency AD 2014-12-52 for all Honeywell TFE731-4, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, -40BR, -50R and -60 turbofans. It required a review of the engine logbook maintenance records to determine if any affected engines are installed and also prohibited operation of an airplane with two or more affected engines that have second-stage low-pressure turbine (LPT2) blades with fewer than 250 operating hours since new. This AD, which retains the requirements of AD 2014-12-52 and clarifies the intent of the mandatory requirements, was prompted by reports of LPT2 blade separations that could result in engine in-flight shutdowns and damage to the airplane.
AD Note Issued for Honeywell TFE731 Variants
- July 16, 2014, 11:55 AM