THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
3 - 2
Effective: 01/01/08
HYDRAULIC SYSTEM
GENERAL DESCRIPTION
Ref. Fig. 3-1 thru 3-4
The S2R-R1340 aircraft has two
individual hydraulic systems using MIL-
H-5606 “red” hydraulic fluid. Each main
landing gear utilizes a master brake
cylinder for the operation of its brakes
and parking brakes. The master brake
cylinder is connected to dual three-puck
disc type brake calipers by brake lines
that are supported by and clamped to the
airframe structure forward of the master
brake cylinder. The hydraulic brake lines
are of rigid steel tubing, except for the
flexible hoses on the landing gear tripod
assembly. The master brake cylinder is
installed aft of the rudder-brake pedals
and is actuated by toe pressure on the
pedals. As toe pressure is applied to the
pedals, a push rod and belcrank linkage
moves an actuator rod, pushing a piston
in the master brake cylinder. This forces
hydraulic fluid into the brake lines and
applies pressure to the appropriate
brake. A spring in the master cylinder
returns the piston to its original position.
A check valve allows hydraulic fluid into
the master cylinder if the piston produces
suction on its return stroke.
MASTER CYLINDER
Ref. Fig. 3-1
The brake master cylinders contain the
actuating cylinder and a reservoir for
MIL-H-5606 hydraulic fluid. The seals in
the master cylinder have been changed
to ones compatible with this fluid.
Figure 3-1: Brake Master Cylinder
