True. Now if the British would just give up on Lucas
electrics!



"flyncatfish" wrote in message
ups.com...
|
| Jim Macklin wrote:
| The parking brake on the BE 23/24 and 76 uses a lock
that
| stops the master cylinder from bleeding fluid back from
the
| brake assemblies. It is a simple device. The brakes
are
| not designed to be used for long term parking since they
do
| not compensate for temperature changes. If the hot
brakes
| are set and then cool the pressure and therefore the
brake
| releases. Even if the brakes are cool, over the night,
the
| air temperature will drop and the brakes release.
Worse, if
| you set the parking brake when it is cool or cold and
then
| the temperature goes up, the pressure increases locking
the
| brake solid and can damage the system. Often the only
way
| to get the parking brake to release is to open the brake
| bleeder valve and that will require time and a mechanic
to
| re-bleed the brakes.
|
| -snip
|
| I think temperature extremes like you mentioned,
complexity, and weight
| considerations are all reasons why the russians dropped
hydraulics in
| favor of pneumatics on many of their aircraft. I have a
russian Yak 52
| and the starting, brake, and flap systems are all
pneumatic. It's nice
| not to have to worry about whether you battery will crank
in the
| morning.
|
| FlynCatfish
|