wrote in news:5fc94b93-52e4-4ee4-8c59-d46cd92a6702
@s19g2000prg.googlegroups.com:

On Dec 2, 5:59 pm, "Roger (K8RI)" wrote:
On Sun, 2 Dec 2007 17:02:07 -0600, "Maxwell"
wrote:

That's used to let people on the ground know if the engine is still
turning. An engine coasting to a stop is nearly silent and is silent
if you are out on the ramp wearing hearing protection.

Roger (K8RI)


Incorrect. The spiral on the fan hub is a bird deterrent measure. It
has nothing to do with ground personnel.

We use them to hypnotise ground staff into loading the chemicals we spray
out at altitude...


Bertie