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
