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the losso f combinedh ydmulic systempteasuteB. oth auxiliary
braking systemsh ave two brakea ccumulatorst hat
providep ressurefo r auxiliary andp arking brakem odeso f
operation when combined hydraulic system is not available.
Accumulators deliver 3,000 psi when fully charged
by the combmed hydraulic system or hydraulic handpump
(with the gear handle down only). When the combiied
hydraulic systemp ressured ecreasebse low 1,425p si, the
shuttle valve in the power brake module shifts the brake
system to the auxiliary brake mode.
Approximately 13 to 14 full dual-brake applications
are available in the auxiliary mode. Dual pneumatic
BRAKE PRESSURE gauges on the front cockpit center
pedestal show auxilii and parking brake accumulator
pressures.F ull capability operationso f the brake accumulators
in the auxiliary modes of operation is predicated
on the system serviced with a nitrogen precharge
of 1,900 %50 psi. The green band of the dial indicates
pneumatic pressure between 3,000 psi at the top of the
band to 2,150 psi; the red band indicates pneumatic
pressuresb etween 2,150 and 1,900p si at the bottom of
the band. Approximately five auxiliary brake applications
are available in the red band. Once the auxiliary
braking system is depleted, braking must be accomplished
by the emergency/parkingb rake.T hree applications
of the parking brake are available.
With either auxiliary brake system, additional braking
can be achieved only by pulling the parking brake haudle
atI. If the shuttle valve in the power brake modules does
not return to the normal position with combmcd hydraulic
pressure greater than 2,000 psi, the BRAKES warning
light will illuminate when a brakep edal is depressedI.n
this instance the wheelbrake accumulators can be rechargedo
nly by the hydraulich andpumpw ith the landing
gear handle down. Pilot manual isolation or system automatic
isolation of the combined hydraulic system cuts off
the supply of combined hydraulic pressuret o the power
brakem odule so that depressiono f the bmke pedalsw ill
cause depletion of the bmkes’ accumulator charge.
p&G-WARNING)
a Even though braking action is available
at accumulator pressures less than 3,000
psi, braking force is proportional to pressure
remaining. Red band pressure
(1,900 psi) is sufficient to hold the
brakes locked with the aircraft stationary
in all deck conditions; however, rolling
motion greatly increases pressure requirements.
Accumulator pressure of up
to 2,100 psi may be required to stop a
moving aircraft in a 4O deck roll. In deck
rolls greater than 6“, 3,000 psi may not
be sufficient to stop a moving aircraft.
l Complete loss of hydraulic fluid through
the wheelbrake hydraulic lines will render
parking brake ineffective.
2.26.5 BRAKES Warning Light. Tbe BRAKES
warning light will illuminate whenever auxiliary brake
pressure is applied to the brakes via the brake pedals,
indicating the combined hydraulic system pressure is
not available to the brakes and cautioning the pilot to
monitor brake application with the auxiliary brake pressure
indicator. A postlight is installed above the BRAKE
PRESSURE gauge to illuminate the dial.
Note
The postlight requires electrical power.
Brakeridem on carrier night respot must use
a flashlight to check the cockpit brake pressure
gauge.
2.26.6 Parking Brake. The parking brake mode
provides a means for collective locking of the wheelbrakes
to maintain a ground static position during normal
operations or during emergency conditions. Aft
movement of the parking brake handle provides for unmodulated
porting of accumulator fluid pressure
through emergency lines to the shuttle valve at the
wheelbrake assembly. In the parking brake mode, the
rudder pedals have no effect on wheelbrake operation.
Pushing the parking brake handle forward releases
wheelbrake pressure and the power brake module reverts
to the normal and auxiliary braking mode. When
auxiliary mode braking action is no longer available by
depressiono f the rudder pedals, sufftcient accumulator
fluid pressure remains for a minimum of three parking
brake applications.
ORIGINAL 2-124
Note
The AUX brake and parking brake pressure
indicator should be pumped into the green
band prior to breaking down and moving the
aircmf? without combmed hydraulic power.
The indicator should be maintained in the
green band until the airmutt is secured. Full
3,000 psi pressure is quited if conditions
are severe (greater than 4O roll, wet brakes,
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F-14D 飞行手册 Flight Manual 1(125)
