FAA News: New Airworthiness Directives Finalizing Required Fixes For Compressor Issues With Pratt & Whitney PW1100G GTF Engine Which Power A320neos
New FAA directive targets PW1100G compressor problems
November 6, 2018 - by BY: JON HEMMERDINGER for FlightGlobal
The Federal Aviation Administration has ordered airlines to replace components in the compressors and turbines of Pratt & Whitney PW1100Gs turbofans, which power Airbus A320neo-family aircraft.
The orders address corrosion concerns and issues with the engines' "knife edge seal" – the same seal that caused several inflight shutdowns earlier this year.
Those shutdowns prompted a grounding of PW1100G-powered A320neos.
"This [directive] was prompted by reports of in-flight engine shutdowns and aborted takeoffs as the result of certain parts affecting the durability of the rear high-pressure compressor… rotor hub knife edge seal," says one directive.
That order requires airlines to address the issue by replacing "diffuser case air seal" assemblies and vane assemblies in the second stages of high-pressure turbines in affected engines.
The FAA calls the knife-edge seal fix an "interim action" while P&W; develops a solution. The problem arose because...