Thrush Aircraft S2R-T660, Maintenance Manual

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THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 12/17/03
6 -13
This conditioning procedure will wear off high spots and generate sufficient heat to create a thin
layer of glazed material at the lining friction surface. Normal brake usage should generate enough
heat to maintain the glaze throughout the life of the lining.
Properly conditioned linings will provide many hours of maintenance free service. A visual
inspection of the brake disc will indicate the lining condition. A smooth surface, one without
grooves, indicates the linings are properly glazed. If the disc is rough (grooved), the linings must be
reglazed. The conditioning procedure should be performed whenever the rough disc condition is
observed. Light use, such as in taxiing, will cause the glaze to be worn rapidly.
BRAKE REMOVAL AND DISASSEMBLY
(Cleveland Disc Type)
A.. Release parking brake.
B. Jack aircraft as outlined in Section II.
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.
*** WARNING ***
Use caution when blowing pistons out the caliper cylinders
with air, as pistons could fly out at high velocity. It is
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.
* NOTE *
The brake caliper pistons on the T660 Turbo Thrush are
equipped with a friction spring (drag ring) on the piston tail. It
is 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