Author Topic: feathering a prop (Read 2303 times)

hitech · « **Reply #45 on:** January 25, 2005, 08:39:58 AM »

Understand normal purge test. But are they started in full feather just because thats where they were left. Or some other resone?

HiTech

Bodhi · « **Reply #46 on:** January 25, 2005, 09:51:09 AM »

Quote

Originally posted by hitech
Understand normal purge test. But are they started in full feather just because thats where they were left. Or some other resone?

HiTech

Hitech, they are in feather because there is no longer any oil pressure to keep them a pitch other than feather.

ie. when the engine is shut down like straiga said, either you pull the prop back to feather, or you let the engine shut down and leave the prop levers alone and they go back to feather on there own as there is no longer any pressure to keep them out of feather. The reason for putting them into feather at shut down is exactly as he said which is to slow things down faster so less wear is placed on metal to metal surfaces that are no longer be lubricated.

hitech · « **Reply #47 on:** January 25, 2005, 10:29:25 AM »

Thanks bodhi:

HiTech

Roscoroo · « **Reply #48 on:** January 25, 2005, 02:20:52 PM »

I never started a C-130 (T-56-15) in feather . the only time you would feather the prop was to test it for emergency shut down and to check the prop brake .

If it could be ran feathered ... that would of been really nice ... I 've been within 2 feet of that darn thing spinning while doing leak checks /tests and It wasnt my favorite thing to do .. next to being shoved up the intake to file/inspect compressor blades ...

any normal preflight tests of feather was done statically.

(<----USAF 82-86 Dual afsc for jet,turbo-prop eng mech and run certs for C-135's and C-130's I worked in a Cams outfit thats why I have dual certs)

my 2cents...

p's. the prop brake does hold the Propeller static when 1st starting until the oil pressure increases and it releases it .. It can be overcome by bumping it over by hand also .