Originally Posted by
tascats
The Saab 340 prop straps would often be broken after gusty winds when parked for a while - the canvas part with the metal ring (which looks like the part in the above photo) would be left attached near the root of the blade and quite hard to spot on a dark morning or if the prop had rotated to the 12 o' clock position. The remaining two clips would still be attached to underside of the intake but the prop could rotate freely. The canvas paiece was quite tight on the blade sometimes so could easily have stayed on for a period before being thrown free.
Methinks ATSB should talk to someone with your experience.