Jump to content
Sign in to follow this  
Jamhands

Loss Of Engine Oil Pressure In Flight

Recommended Posts

FYI, the 350 freewheel maintains a separate lubrication system from the engine.

Loss of engine oil does not affect freewheel function.

 

The freewheel itself yes, but not the rear output bearing... No? I'm of course talking worst case scenario here.

Share this post


Link to post
Share on other sites

Back in the day, when I toiled for Her Majesty, we had an RAF exchange officer cold wx testing a Hiller 12E who experienced lost transmission pressure cruising at 2K AGL. He closed the throttle, the rotor wound down, and he thundered in exceeding 22G.

 

My VERY golden rule ever since has been KEEP THE ENGINE GOING AND GET TO THE SURFACE AS FAST AS YOU CAN.

 

Only ever had one application of the rule, but the presssure loss was accompanied by heat ddue to a substantial leak, no sweat.

  • Like 2

Share this post


Link to post
Share on other sites

FYI, the 350 freewheel maintains a separate lubrication system from the engine.

Loss of engine oil does not affect freewheel function.

 

 

So what does lubricate the freewheel in a 350 then? Its sure not the transmission oil as is done in BHT products as there are no external lines run between the two.

Share this post


Link to post
Share on other sites

I dunno, i'd have to look at schematics alot closer to see what part the rear bearing has in it, and i don't have any books in front of me.

 

Well, if you 'dunno', maybe you should hold off on the 'FYI's'.

 

So what does lubricate the freewheel in a 350 then? Its sure not the transmission oil as is done in BHT products as there are no external lines run between the two.

 

Similar to the 500 clutch, the Arriel freewheel has it's own supply of oil internally. It used to be serviced in the field, but now it's a sealed unit.

Share this post


Link to post
Share on other sites

my FYI was spot on, you verified that with your last post. So clearly you knew the answer anyways.

 

The "dunno" was simply because you added another twist regarding a rear bearing, which i chose not to comment on until i could look at it further. Is that a problem?? If you wanna be a d*ck about that, that speaks volumes. *thumbs down*

 

So now that I have had a look, your not having to worry about the rear bearing at all. The clutch will work ....as designed... regardless.

  • Like 1

Share this post


Link to post
Share on other sites

Back in the day, when I toiled for Her Majesty, we had an RAF exchange officer cold wx testing a Hiller 12E who experienced lost transmission pressure cruising at 2K AGL. He closed the throttle, the rotor wound down, and he thundered in exceeding 22G.

 

My VERY golden rule ever since has been KEEP THE ENGINE GOING AND GET TO THE SURFACE AS FAST AS YOU CAN.

 

Only ever had one application of the rule, but the presssure loss was accompanied by heat ddue to a substantial leak, no sweat.

 

What was the OAT and the type/viscosity of the oil being used?

Were the auto rev's checked and verified to be in specification?

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...