THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
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.
*NOTE*
The pistons are equipped
with a friction spring (drag
ring) on the piston tail. It is
recommended that this ring
NOT be removed unless it
requires replacement.
K. Inspect pressure plate assembly for
cracks, damaged pins and excessive
warped contours. Replace pressure
plate if cracked or severely
deformed. Replace 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
(see Fig. 6-3).
N. Inspect torque plate for cracks, nicks,
burrs, rust, excessive wear and
brinelling in bolt holes. Replace
torque plate if cracked or severely
deformed.
O. Clean repaired surfaces and areas of
the brake assembly from which paint
has been removed.
P. Paint exposed areas with one coat of
zinc primer and one coat of
aluminum lacquer.
Q. Check the wheel brake disc. See
procedures under Inspection of Main
Wheel Assembly and Figure 6-3.
BRAKE SERVICING
MEASURING BRAKE LINING WEAR
Ref. figure 6-3
The minimum wear thickness for
replacement of metallic linings is 0.100
inch.
REMOVAL OF BRAKE LININGS FROM
CALIPERS
A. Remove backing plate attaching
bolts and washers, and remove back
plates and insulator shim.
B. Carefully slide brake caliper out of
torque plate bushing.
C. Slide pressure plate assembly (lining
carrier) off anchor bolts.
REPLACEMENT OF ORGANIC
LININGS
Ref. figure 6-4
Old organic linings may be removed by
using a small drift pin or carefully drilling
out the rivets with a 1/8-inch diameter
drill. Use care to prevent elongating the
rivet holes. Deburr the surface adjacent
to the lining to allow lining to set flush.
A. Clean pressure plate and back plate
surfaces of dirt, grease, etc. before
installing new linings.
B. Inspect pressure plate and back
plate for excessive corrosion, visible
damage, or excessive warping.
Straighten pressure plate too less
than 0.010 inch (0.254mm) flatness.
C. Align new factory authorized
replacement lining segments on
pressure plate/back plates and install
P/N 105-0200 rivets, using
Cleveland’s rivet set, P/N 199-1, or
appropriate riveting tool.
6-8
Effective:
01/01/08
