Chapter 1
Fatigue
Harsher than its type
How short were its legs?
Utilization isn’t graded for N91PR: too few of its flights were tracked to count its use fairly, in the full report too. So its free chapter here is Fatigue, which doesn’t depend on catching every flight.
Short legs put more pressurization cycles on the structure for the same time in the air. Worth checking its cycle-based inspection limits before a pre-buy.
Hours per landingLead measure. 4th percentile
Middle 1.6N91PR0.53+1.1 : 1middle Challenger 300 1.6 : 1
Short hops94th percentile
Middle 35%N91PR0%80%+55%middle Challenger 300 35%
Leg length6th percentile
Middle 471 nmN91PR200 nm1,000 nm+268 nmmiddle Challenger 300 471 nm
How its legs split
Share of N91PR’s legs by length, nm, in the twelve months