Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual page 137

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
C. Disconnect and cap brake hydraulic supply line at brake housing.
D. Remove back plate assemblies from calipers.
E. Remove caliper assemblies.
F. Remove pressure plate assembly.
G. Clean all metal surfaces with denatured alcohol and dry thoroughly. All "0" rings
are to be replace. Remove pistons by injecting air into the caliper ports (15 to 20
psi) maximum pressure.
Use caution when blowing pistons out the caliper cylinders
with air, as pistons could fly out at high velocity.
suggested that the caliper be turned over so that pistons
face table working surface. Use a rag to cushion piston
contact with table surface to prevent piston damage. Make
sure to wear all applicable personal protective safety
equipment.
The brake caliper pistons on the Turbo Thrush are equipped
with a friction spring (drag ring) on the piston tail.
recommended that this ring NOT be removed unless it is
damaged or corroded.
H. Inspect brake cylinders for cracks, nicks, corrosion and damaged threads.
Inspect inlet and outlet hydraulic ports for foreign contaminates.
cylinder walls for scoring or excessive wear. Blend and polish light scratches in
piston cavities with fine emery cloth, 600 grit. Castings that are cracked or have
damaged threads should be replaced.
I. Inspect anchor bolts for cracks, corrosion, permanent set and excessive wear.
Replace bolts that are bent, cracked or severely corroded.
J. Inspect pistons for cracks, nicks, burrs, or excessive wear. Remove burrs and
blend out nicks, using fine emery cloth 600 grit, and clean thoroughly.
K. Inspect pressure plate assembly for cracks, damaged pins and excessive warped
contours. Replace pressure plate if cracked or severely deformed.
cracked or deformed pins.
L. Inspect brake cylinder bolts for cracks, damaged threads, and self-locking feature.
Replace bolts that are cracked, bent or have damaged threads.
M. Inspect brake linings for cracks, edge chipping, and surface deterioration.
Linings should be replaced when worn to a thickness of 0.100 inch.
Effective: 05/05/04
AIRCRAFT MAINTENANCE MANUAL
*** WARNING ***
* NOTE *
It is
It is
Examine
Replace
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