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Normal Brake Servovalve - Location
Figure 020
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Normal Brake Servovalve - Characteristics
Figure 021
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Normal Brake Servovalve - Schematic
Figure 022
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G. Restrictor Restrictor has been installed to adapt the Normal system to the hydraulic behavior during transients. 1 restrictor on the Normal system:
-1 at automatic selector outlet (Dia. 2.1 mm).
H. Safety Valves (Ref. Fig. 023, 024, 025, 026) A safety valve is installed between the brake servovalve and the brake. It stops the flow in the line if there is a leakage. The safety valve is made to operate only if the flow is more than or equal to 4 l/mn. The time for valve closure is less than 5 s (with fluid temperature = 30 deg.C) for a flow rate more than or equal to 5 l/mn under a supply pressure of 206 bars (2987 psi). Normally, the valve is in the position shown on the referenced figure. Under the above conditions, the valve operates and the supply pressure acts on the slide valve in chamber A. As a result, the valve closes. When the chamber A is filled, there is a time delay which prevents an untimely operation as a result of the transient high flow rates found during filling of the brakes or anti-skid regulation. To prevent the untimely operation of the valve when the brake are bled, the bleeders are moderately open and the brake pressure must not be more than 50 bars. The valve stays closed after operation for a supply pressure more than or equal to that of the reservoir. The valve is reset when you depressurize the reservoir return systems or when you open the bleed screw on one end of the valve.
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Normal Brake Safety-Valve P/N C24757000 - Location
Figure 023
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Normal Brake Safety-Valve P/N C25243002-2 - Location
Figure 024
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Safety Valve P/N C24757000 - Schematic
Figure 025
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Safety Valve P/N C25243002-2
Figure 026
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R J. Brakes **ON A/C 001-001, 004-049, 051-099, 101-149, 151-199, 201-299,
R (Ref. Fig. 027) **ON A/C 002-003,
R (Ref. Fig. 027A) **ON A/C 301-399,
R R (Ref. Fig. 027B) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
R (Ref. Fig. 028) **ON A/C 301-399,
R (Ref. Fig. 028A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
R (Ref. Fig. 029) **ON A/C 301-399,
R (Ref. Fig. 029A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
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. 030) 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 during a removal/installation of the brake.
(b)
Pistons
**ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
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