Maintenance Manual XA41/XA42
AMM-XA42-0040-001 C.00
Page
20
Page date:
Chapter 32
25.09.2018
CAUTION
WARNING
Inspection and repair:
1
Visually examine the cylinder for cracks, nick, corrosion or other damage. If there
are cracks around the torque pins, replace the cylinder.
2
Examine the caliper torque pins for wear, cracks in the caliper body or other
damage. Make sure that the torque pins are correctly tightened. Cracks in the caliper
body or loose torque pins are causes to reject the caliper body.
Be careful when you remove the nicks and scratches from the piston. Do not cause
damage to the protective coating to prevent corrosion.
3
Examine the piston bore and the piston for contamination, corrosion and scratches.
Polish small nicks and scratches to remove them. Nicks or scratches with an unusual
depth are a cause to reject the part.
4
Visually examine the back plate and the press plate. Unusual corrosion and/or
deformation are causes to reject the part. Make the press plate straight. Replace it,
if it has a deformation of more than 0.010”.
5
Examine the torque plate for corrosion and cracks. Unusual corrosion or cracks are
causes to reject the part.
Assembly and installation of the brake caliper assembly:
1
Clean the brake parts in solvent. Do not clean the O-rings and the brake linings. Dry
the cleaned parts with air.
Be careful with the hydraulic fluid to prevent injury and damage to equipment. Do
not get in on your skin. Remove hydraulic fluid immediately from the skin and from
the equipment.
2
Apply aircraft hydraulic fluid, Dow 55M O-ring lubricant or an equivalent to a new or
serviceable O-ring. Carefully install it on the piston.
3
Apply a light layer of aircraft hydraulic fluid, Dow 55M O-ring lubricant or an
equivalent to the piston bore. Find the side of the piston with the O-ring that is
nearest to the surface. Put this side carefully into the caliper. Install it fully until the
top of the piston is flush with the caliper body.
4
Move the caliper assembly onto the torque plate on the aircraft.
5
Install the back plate. Torque the back plate bolts to 90lbs.in. Safety the attachment
bolts of the back plate with a wire.
6
Connect the hydraulic lines. Bleed the brake system, refer to chapter 12-10-06.
7
If you removed the torque plate, install it in its initial position.
After maintenance on the brakes or the brake system, make sure that the brakes operate
correctly. Push the brake pedals and operate the engine at 1.800 RPM. The brakes must
keep the aircraft in the stopped position (on hard surfaces).
Summary of Contents for XA41
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