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* Hydroplane protection decreases wheel brake pressure to 1
and 3 when ground speed is more than wheel speed
* Gear retract inhibit prevents the alternate anitskid system
from operation during normal landing gear retraction.
Autobrake System
The autobrake system monitors wheel deceleration and
controls metered pressure on touchdown to maintain what the
pilot selected on the AUTO BRAKE select switch until the
airplane comes to a full stop. These are the autobrake functions:
* 1, 2, 3, and MAX deceleration positions command the
autobrake system during landing brake control to modulate
brake pressure until the airplane is at a full stop
* The rejected takeoff (RTO) position commands the autobrake
system to apply full pressure to the wheel brakes and stop
the airplane. The autobrake system operates in RTO when
the pilot starts a rejected takeoff at groundspeed more than
88 knots.
ANTISKID/AUTOBRAKE SYSTEM - INTRODUCTION
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - INTRODUCTION
ANTISKID/AUTOBRAKE SYSTEM - INTRODUCTION
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - INTRODUCTION
ANTISKID/AUTOBRAKE SYSTEM - INTRODUCTION
EFFECTIVITY
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Purpose
The antiskid system controls the metered brake pressure from
the hydraulic brake system or the autobrake pressure from the
autobrake system to prevent wheel skid. This gives maximum
brake force to stop the airplane with any runway condition.
Components
These are the antiskid components:
* Antiskid valves (6)
* Transducers (4)
* Landing gear lever up switch
* Alternate brake pressure switch
* Antiskid/autobrake control unit (AACU)
* Antiskid inoperative amber light.
Antiskid Valves
Four antiskid valves in the normal hydraulic brake system
control brake pressure to each wheel brake. Two antiskid
valves in the alternate hydraulic brake system control brake
pressure to the wheel brakes on each main landing gear.
Transducer
A transducer in each main landing gear wheel axle supplies
wheel speed data to the AACU.
Landing Gear Lever Up Switches
The landing gear lever up switches sends the position of the
landing gear lever to the AACU.
Alternate Brake Pressure Switch
The alternate brake pressure switch shows that the alternate
hydraulic brake system has pressure.
Antiskid/Autobrake Control Unit
The AACU controls antiskid operation and monitors the system
for faults.
Antiskid Inoperative Amber Light
The ANTISKID INOP amber light comes on if there is a fault in
the antiskid system.
General Description
The AACU gets wheel speed data from the transducers. The left
and right ADIRUs supply ground speed data. The PSEU
supplies air/ground signals from system 1 and system 2 to
the AACU for touchdown/hydroplane protection. The parking
brake system supplies a signal when there is a disagreement
between the parking brake valve and the parking brake switch.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID GENERAL DESCRIPTION
EFFECTIVITY
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When a wheel skids, the AACU sends signals to the antiskid
valves. If the normal brake system has pressure, the antiskid
valve in the normal hydraulic brake system releases pressure
for that wheel. This permits wheel speed to increase and stop
the skid condition.
The normal antiskid valve releases unwanted brake pressure
through the parking brake valve. The antiskid system monitors
the correct operation of the parking brake valve to make sure
the unwanted brake pressure can be released.
If the alternate hydraulic brake system has pressure, the
antiskid system operates almost the same as the normal
system. If a wheel on one main landing gear skids, the antiskid
valve in the alternate hydraulic brake system releases the
brake pressure to the two brakes on that main landing gear.
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