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is normally pressurized to 3,000 ilO0 psi at any
time the respective engine is operating.
2.16.1.2 Hydraulic Pressure Light. A HYD PRESS
caution light illuminates when the discharge pressure
from either engine-driven hydraulic pump falls below
2,100 psi; thereafter, the light goes out when pressure in
both systems via the engine-driven pumps exceeds
2,400 psi. If the HYD PRESS caution light has been
illuminated by low pressure in one main system,
pressure failure in the other system will not cause the
MASTER CAUTION light to illuminate again. The
COMB and FLT gauges on the hydraulic pressure indicator
reflect system pressure provided by either the
engine-driven pumps or the hydraulic transfer pump.
With both systemsn ormally pressurizedt o 3,000p si, the
gauge needles form a horizontal line.
Note
High-rate lateral movements may illuminate
the HYD PRESS light when engines are at
idle power.
2.16.1.3 Hydraulic Transfer Pump (Bidirectional
Pump). To assure the continuance of main system hydraulic
pressure with an engine or engine-driven pump
inoperative, a second source of pressure is provided by
the hydraulic transfer pump. This unit consists of two
hydraulic pumps, one in each of the main hydraulic
systems, interconnectedby a common mechanical shaft.
Thus, a pressure deficiency in one system is automatically
augmented using pressure in the other system as
the motive power. The result is bidirectional transfer of
energy without an interchange of system fluid. The efficiency
of the pump is such that a 3,000 psi system on
one side will pressurize the other system to approximately
2,400 to 2,600 psi.
To prevent damage to the hydraulic transfer pump
with the loss of system fluid on one side and to conserve
hydraulic power in the remaining good system, the
pump is automatically secured when pressure less than
500 psi is detected on either side of the pump for 10
seconds. In addition, the pilot can manually shut offthe
hydraulic transfer pump by lifting the guarded HYD
TRANSFER PUMP switch, located aft on the right
outboard console.
ORIGINAL 2-68
NAVAIR 01.Fl4AAD-1
Figure 2-39. Hydraulic System Controls and Indicators (Sheet 1 of 2)
2-69 ORIGINAL
NOMENCLATURE FUNCTION
0
HYD PRESS indicator COMB and FLT - Indicates pump discharge pressure on each engine,
normally 3,OGO psi, or hydraulic transfer pressure
approximately 2,400 psi.
SPOIL - When the outboard spoiler hydraulic module is pressurized
(1,950 to 2,050 psi) the ON flag appears. Pressure below
1,900 to 1,950 psi: the OFF flag appears.
EMER FLT - When pressure from the backup flight control hydraulic
module reaches 500 * 50 psi the ON flag appears.
Pressure below 350 + 50 psi: the OFF flag appears.
0 HYD ISOL switch FLT - Combined system hydraulic pressure is shutoff to landing
gear, nosewheel steering, antiskid, and v&eel brakes.
T.O./LDG - Hydraulic pressure is avallable to all combined system
components.
03 BRAKE PRESSURE gage AUX - Green segment lndlcates hydraulic pressure (2, f 50 & 50 to
3,000 psi) In the auxiliary brake accumulator; auxiliary
braking may be applied by rudder toe pedals
(approximately 13 to 14 applications available). Red
segment lndlcates 1,900 to 2,150 psi (approximately 5
applications available).
PARK - Green segment indicates hydraulic pressure (2,150 of: 50 to
3,000 psi) In the parking brake accumulator. The
parking/emergency brake handle must be pulled to apply
emergency braklng (approximately 3 applications
available). Red segment Indicates 1,900 to 2,150 psi.
@
HYD PRESS caution light lllumlnates when hydraulic pressure from either englne-driven pump is below
2,100 psi. It will go out with pressure In both systems at 2,400 psi or above, If
pressure Is provided by engine-driven pumps.
@ ;HY;rRANSFER PUMP SHUTOFF - Guard must be lifted. Shuts off hydraulic transfer pump. me
pump should be secured when hydraulic pressure drops
below 500 psi and does not rise agaln within 5 seconds.
NORMAL -
(Guarded)
Safety guard down. Pressure loss below 2,100 psi In one
hydraulic system activates hydlaullc transfer pump to
supply pressure from the other system.
@ EMERG FLT HYD switch HIGH - Guard must be lifted. Activates the power module (high
speed mode) bypassing flight and combined 2,100-psi
switches.
LOW - Guard must be lifted. Activates the backup power module
(low-speed mode) bypassing flight and combined
2,100-psi switches.
AUTO (LOW) - Safety guard down. The backup flight control system is
automatically activated (low-speed mode) when pressure
　
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