CFM LEAP-1B missing SFC

The revelation by Aspire Aviation about the performance shortfalls of the CFM LEAP engine family did not came totally unexpected. Rumours have been around for a long time. But the severity of the shortfall in the LEAP-1B engine is somewhat shocking, at least for Boeing customers. The shortfall of 2% in the case of the LEAP-1A is relatively unspectacular: the shortfalls of recent engines at EIS like the GEnx and the Trent 1000 were higher. A shortfall of 2% can be corrected with a suitable performance improvement program (PIP), but a