dsavarese(at)elmore.rr.co
Guest
|
 Posted: Thu Jun 08, 2006 11:15 am Post subject: [Yak52TW] Re: MISC TW info |
 |
|
As I'm sure you are aware, the air pressure bleeding off while the gear is
retracting acts like a shock absorber within the actuator. That is what
keeps the gear from slamming into the uplocks. By bleeding off the air
pressure (putting the gear handle in neutral) and then moving the gear
handle to the UP position obviously works, but now you are potentially
creating more problems down the road because the gear is not suppose to be
slamming into the uplocks. That is why there are the little reducers in the
up side and normal down side, but not the emergency down side. These little
reducers in the line reduce the flow but not the pressure. By doing so it
allows the gear to cycle smoothly and not bang or slam up or down.
Most everyone has witnessed or performed an emergency gear extension while
the airplane is on jacks. The procedure of course is to turn the main air
off, move the gear handle to neutral (sound familiar?) and then open the
emergency gear extension valve. This relieves all the air pressure in the
actuators. Thus, no back pressure to act as a shock absorber. The gear
extends very rapidly and literally slams into the down and locked position.
Bottom line here is, normal gear retraction and extension has a built in
shock absorbing mechanism. Try not to defeat it or circumvent it (unless
absolutely necessary) because it can lead to other problems with actuator
and uplock mechanisms as well as the potential damage to the uplock assembly
structure and attachment area caused by the physical pounding.
FWIW
Dennis
---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
