Engines
MRO Urges Operators To Mind the (Z) Gap
Dallas Airmotive is reminding HTF7000 operators of the OEM's Service Bullentin AS907-72-9067

Dallas Airmotive is reminding operators of Bombardier 300-series Challengers, Gulfstream G280s, and Embraer Legacy 450/500 twinjets that it's time to have the Z-gap on their LPT2 rotor blades inspected, if it's been more than 4,000 hours since the last borescope inspection on their HTF7000 engines. Engine OEM Honeywell issued a service bulletin in 2017, stating that there is a possibility on high-time engines for the blades on the second stage low-pressure turbine to separate, leading to vibration and potential damage to that engine section.