"Kev" wrote in news:1173932233.850178.56640
@n76g2000hsh.googlegroups.com:



Some planes, for example the Airbus, also depend on powered hydraulics
as a separate aid to holding the gear in place.

Actualy, no they don't. and you can lower the landing gear in any 'bus
through completely mechanical means and it wil stay down with no
hydraulics powering the system whatsoever..

They suggest that
pins be put in place if a tug is used to move an unpowered plane (such
as for maintenance).

They do that in any type of airplane...



Bertie