Figure 12–41.—Use of blowout screen on overheated brakes.
Heat transfer to the wheel will continue for some
Once the brake has been properly cooled, permit the
period of time until the brake is cooled. The danger of
explosive failure may exist after the aircraft is secured
if action is not taken to cool the overheated brake.
The recommended procedure for cooling
overheated wheel, brake, and tire assemblies is to park
the aircraft in an isolated location. Allow the assembly
to cool in ambient air for a period of 45 to 60 minutes.
The use of cooling agents to accelerate cooling is not
recommended unless operational necessity dictates their
use. The application of the agents exposes personnel to
danger by requiring their presence near the overheated
assembly. However, if it is necessary to accelerate
coding, use an intermittent stream of water or fog.
When using water, direct a stream to the brake. The
water should be applied in 10- to 15-second periodic
bursts, not in a continuous discharge. Each application
should be separated by a waiting period of at least 30 to
60 seconds. A minimum of three to five applications is
usually necessary.
When fog is used, the fog is deflected to the brake
side of the wheel for a period of 5 to 10 seconds. Each
application should be separated by a waiting period of
at least 20 seconds. This method is applied as long as it
is necessary to control the temperature of the affected
assembly.
wheel to cool in ambient air. A crosswind or forced air
from a blower or fan will assist in cooling the wheel.
The aircraft should not be moved for at least 15 minutes
after cooling operations.
BRAKE SYSTEM COMPONENT
MAINTENANCE
Learning Objective: Recognize the various
componen ts of a representative brake system,
such as valves, reservoirs, and swivels. Identify
the operation of a brake master cylinder.
Components of brake systems are not peculiar to
any one system. A given component will vary in shape,
size, capacity, and manner of operation (depending
upon the manufacturer), but the function remains the
same. In this section, we will discuss some of the more
common brake system component maintenance
practices.
INDEPENDENT SYSTEM RESERVOIR
Repair of this brake reservoir is limited to
disassembly, cleaning, and replacement of high usage
parts from a cure-date repair kit. These high usage parts
consist of a new sight glass with its O-ring seal, washer,
12-45
