My aircraft has a landingdistance of 3000 ft without propeller reversing
and 2500 ft with propeller reversing.
Operated under JAR-OPS 1, I need 3000 ft x 1.42 = 4260 ft without reversing
and 2500 ft x 1.42 = 3550 ft with propeller reversing.
So if I could calculate with reversers, I could land at 710 ft shorter Airfields.
The Landing distance without reversers and without the JAR-OPS Factor (3000ft) is shorter than the required distance with reversers and including the factor 1.42 (3550ft)
So it is still save even when the reversers will fail.
Inbalance