-
the L/G control lever (6GA) is put in the down position. Hydraulic power is then put back into the normal extension/retraction system and the L/G doors close.
(4) Braking and Related Systems
(a) Normal Braking
In the automatic mode the selection of a AUTO/BRK P/BSW (LO MED or MAX) sets a program to give a set deceleration rate. The BSCU automatically starts the program when the aircraft configuration is correct and then controls the pressure sent to the brakes.
In the manual mode the movement of the brake pedals operates the brake-pedal transmitter unit. The transmitter unit sends a signal to the BSCU which in turn sends the required input signal to the servovalves. The servovalves let a pressure, in proportion to the pedal travel go to the brakes.
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The BSCU also controls the anti-skid function. It compares the MLG wheel speeds with the aircraft speed and releases a brake if there are indications of a skid.
(b)
Alternate Braking
When the brake pedals are operated the low-pressure hydraulic system operates a dual valve. This lets hydraulic pressure from the yellow hydraulic system go to the second set of pistons in the brakes. The BSCU controls the anti-skid function. If the BSCU cannot supply this control, braking is in proportion to the amount of pedal travel.
(c)
Parking Brakes (Ref. 32-45-00)
When the park brake selector switch is set to ON, pressure from the yellow hydraulic system or the related accumulators is sent to the second set of pistons in the brakes. When this system is in use all other braking systems are hydraulically isolated.
(d)
Brake Temperature System (Ref. 32-47-00)
The brake temperature system continuously measures the temperature at each brake. The sensor at each brake sends a signal to a Brake Temperature Monitor Unit (BTMU). Each BTMU receives the signals from a pair of brake sensors and sends the data to the BSCU. The BSCU sends the data to other interface systems.
R **ON A/C 051-099, 301-399, 401-499,
(e) Brake Cooling (Ref. 32-48-00)
When the P/BSW is set to ON, the fans in the wheel shrouds turn and pull air through the brakes. This decreases the temperature of the brakes more quickly.
**ON A/C 051-099,
(f) Tyre Pressure Indicator System (Ref. 32-49-00)
The TPIS automatically monitors the tire pressures and shows these values on the WHEEL page of the system display (Ref. 31-60-00). The tire pressure indicating computer also supplies other data and warnings when the pressures are unsatisfactory.
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(g) Steering (Ref. 32-51-00)
The BSCU uses the steering input signals from the hand wheel transmitters in the cockpit to calculate:
-
the necessary steering angle
-
the necessary rate of movement
-
the direction of the turn.
It then sends steering output signals to the electro-hydraulic
components to operate the steering mechanism.
B. Indicating
R **ON A/C 001-049, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 012)
**ON A/C 051-099,
(Ref. Fig. 012A)
R **ON A/C 401-499,
(Ref. Fig. 012B)
**ON A/C ALL
Data from the L/G systems is shown on the WHEEL page of the systems display (Ref. 31-60-00).
System warnings are given on:
-
the L/G control lever (6GA)
-
the cockpit loudspeakers
-
the master warning and caution lights
-
the EWD
-LDG Gear UNLK annuniciators.
Refer to (Ref. 32-61-00) for the L/G configuration and fault warnings. For other warnings refer to the specified chapter.
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ECAM WHEEL Page Display
Figure 012
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ECAM WHEEL Page Display
Figure 012A
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1 1 Aug 01/05
1 1
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ECAM WHEEL Page Display 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM LANDING GEAR 起落架1(78)
