L. Brakes
(Ref. Fig. 020, 021, 022)
The brakes are of the multidisc type. Each brake includes:
-
a piston housing,
-
a torque tube,
-
a carbon heat pack.
(1) Piston housing
The piston housing is a forged aluminum-alloy part which changes the
hydraulic pressure into a load by the use of pistons.
The piston housing has:
-two hydraulically independent sets of pistons,
-
a bleeder for each of the two systems,
-
a half self-sealing coupling for each system,
-
a torque tube,
-two wear indicators for the heat pack,
-a brake temperature sensor.
Two 1/4 in. hoses supply the hydraulic pressure to the brake.
(a) Self-sealing couplings
(Ref. Fig. 023)
These are two half couplings attached together: - one installed on the piston housing,
-the other one installed on the 1/4 in. hose and thus included in the landing gear plumbing. The couplings seal off the brake and supply lines and thus prevent the need to bleed the brakes.
(b) Pistons
(Ref. Fig. 024)
There are seven pistons for each system.
The pistons have a return spring and a spiral friction spring
which:
-cause the automatic return of the piston,
-take-up the play in the heat pack caused by the wear of the
carbon discs. Insulators give a protection to the pistons against the heat. They are installed on a steel plate. The pistons act on a pressure plate which applies the braking loads evenly to the brake discs.
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Wheel and Brake Assembly
Figure 020
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Brake Assembly
Figure 021
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Brake Assembly
Figure 022
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Self - Sealing Coupling
Figure 023
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Piston/Adjuster assembly
Figure 024
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(2)
Torque tube The torque tube is a forged steel part with a bolted back plate. The braking reaction is transmitted:
-from the stators to the torque tube by splines,
-to the landing gear axle by three attachment bolts and nine pins.
Three tie bolts of high-tensile steel attach the torque tube to the
piston housing.
Three bolts and nine pins attach the brake to the axle flange of the
landing gear.
They also transmit the torque from the torque tube to the axle.
(3)
Heat pack The heat pack has several structural carbon rotors and stators. There are four rotors. Steel drive keys which are riveted to the discs give a protection to the two rotors and stators.
(a) Wear pin indicator
(Ref. Fig. 025)
Two wear pins are attached to the pressure plate. They give a visual indication of the overall wear of the heat pack without removal (Parking brake applied).
(b) Temperature sensor (Ref. 32-47)
(Ref. Fig. 026)
The temperature sensor gives the temperature of the heat pack. The body of the temperature sensor is attached to the piston housing.
(4)
Cooling fans (Ref. 32-48) The fans increase the cooling of the heat packs.
(5)
Characteristics
-Weight: approx. 72 kg (158.7327 lb)
-
Maximum energy: 70 x 10 to the power 6 Joules
-
Maximum capacity: approx. 45 cubic centimeter
-Warning temperature: 300 deg.C (572.00 deg.F)
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Wear Pin Indicator
Figure 025
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Temperature Sensor
Figure 026
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