Chapter 1
Fatigue
Harsher than its type
How short were its legs?
Utilization isn’t graded for N975DM: 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. 8th percentile
Middle 1.4N975DM0.52.5+0.9 : 1middle Learjet 45 1.4 : 1
Short hops89th percentile
Middle 37%N975DM0%90%+59%middle Learjet 45 37%
Leg length14th percentile
Middle 431 nmN975DM100 nm1,000 nm+264 nmmiddle Learjet 45 431 nm
How its legs split
Share of N975DM’s legs by length, nm, in the twelve months