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isolate HYD 2A pressure, if still available, so that the normal brake lines are unpressurized.
During emergency braking, backup pressure is applied through the left and right servovalves
proportional to the amount of pilot applied brake pedal force and is routed to the main wheel brakes
through the emergency brake lines. These lines bypass the anti-skid control valve, so the pilot must
regulate brake pedal force to prevent wheel skid.
Hydraulic accumulators and the brake accumulator pressure gauge are discussed in the Hydraulic
Power Supply System section.
A1-F18EA-NFM-000
I-2-50 ORIGINAL
2.7.3.5.1 EMERG BRK Handle. The EMERG BRK handle is combined with the PARK BRK handle
and is located on the lower left main instrument panel in the front cockpit. When the handle is in the
stowed, emergency position (horizontal), the ``EMERG'' label appears upright. See figure 2-17. To
select emergency brakes, the handle must be pulled to the detent while in the horizontal position.
Stowed
(unmarked)
Emergency brake valve closed. Normal braking selected.
PULL
(to detent)
Emergency brake valve open. Emergency braking selected.
The position of the EMERG BRK handle is the only indication that
emergency braking is selected: no warning or caution is displayed. The
EMERG BRK handle(s) must be fully stowed in both cockpits to make
sure that normal braking with anti-skid is available.
Due to friction in the EMERG BRK handle mechanism, the handle may
not return to the fully stowed position unless positively pushed.
Figure 2-17. Emergency/Parking Brake Handle
A1-F18EA-NFM-000
I-2-51 ORIGINAL
2.7.3.5.2 EMERG BRK Handle (F/A-18F). The EMERG BRK handle, located on the lower left main
instrument panel in the rear cockpit, is used to select emergency braking from the rear cockpit. When
stowed, the handle is oriented vertically.
Stowed
(unmarked)
Emergency brake valve closed. Normal braking selected.
PULL Emergency brake valve open (to detent). Emergency braking selected.
The position of the EMERG BRK handle is the only indication that
emergency braking is selected: no warning or caution is displayed. The
EMERG BRK handle(s) must be fully stowed in both cockpits to make
sure that normal braking with anti-skid is available.
Due to friction in the EMERG BRK handle mechanism, the handle may
not return to the fully stowed position unless positively pushed.
2.7.3.6 Parking Brake System. The parking brake is used to lock the main landing gear wheels when
the aircraft is parked. The parking brake is activated when the PARK BRK handle is rotated and
pulled to the locked position. This action places the emergency brake valve in the parking brake mode.
Backup hydraulic pressure from HYD 2B or the brake and APU accumulators is applied to the wheel
brake hydraulic servovalves and routed to the main wheel brakes through the emergency brake lines.
The PARK BRK caution will come on to alert the pilot that the parking brake is still set when both
throttles are advanced above about 80% N2 rpm (INS on).
2.7.3.6.1 PARK BRK Handle. The PARK BRK handle is combined with the EMERG BRK handle
and is located on the lower left main instrument panel in the front cockpit. From the stowed
(horizontal) position, the handle must be rotated 90° counterclockwise and pulled to the locked
position, in order to activate the parking brake. When the handle is in the vertical position, the
``PARK'' label appears upright. See figure 2-17. If emergency brakes are selected, the handle must be
returned to the stowed position before the parking brake can be activated. Rotating the handle 45°
counterclockwise releases the lock and allows the handle to return to the stowed (horizontal) position.
Stowed
(unmarked)
Parking brake released. Normal braking selected.
TURN/
PULL
Parking brake set.
Several aircraft systems utilize parking brake activation to enable or disable logic. A set parking
brake is used to enable anti-skid BIT logic, GEN TIE logic, and INS alignment and is used to trigger
the PARK BRAKE caution.
A1-F18EA-NFM-000
I-2-52 ORIGINAL
2.7.3.7 Main Wheel Anti-Spin. The anti-spin function stops main landing gear wheel rotation prior
to landing gear retraction. When the LDG GEAR handle is moved to the UP position, main landing
gear retract pressure is supplied to the anti-skid control valve. Normal brake pressure is blocked and
this anti-spin pressure is routed to the wheel brakes through the normal brake lines. Unlock and
retraction of the main landing gear is delayed until anti-spin pressure is applied and main wheel
rotation has stopped.
2.7.4 Launch Bar System. The launch bar is electrically controlled, hydraulically extended, and
　
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本文鏈接地址：NATOPS Flight Manual 飛行手冊 1(55)