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failed within stow slowly with aerolocks.
dynamic loads.
4lC Al Ramp No. 1 Sustained command
UC A2 Ramp No. 2 and feedback error
UC s3 Ramp No. 3
4IC Al, Hydraulic pressure Sustained error due
UC A2,
Ramp(s) may move
loss of ramp No. 1, to loss of hydraulic if failure occurred
&?A3
No. 2, or No. 3 pressure with ramp(s) out of
mechanical locks.
‘INLET caution light
tventually illuminates
RAMP light will
illuminate.
Kt.5 Mach)
r]ONE Loss of hydraulic
No INLET caution light pressure
:0.5 Mach)
Note
AlC symbol has L or R appended (AICL, AICR) to identify on which
side failure was detected.
F-. tgure Z_ -bI . P- ~a. U- -S^a tMe ode - INLET Light Illuminated
Note
Transferring to SEC mode will revert the
AICS programmers to the REV 4 (TF-
3OIF14As) cheduleb ecauseo f the losso f the
AFTC Nl speed signal and will display an S4
acronym. Below 25,000 feet and at airspeeds
greater than 1.1 Mach, unloading the aircraft
to less than lg will reduce inlet stability and
may result in inlet buzz and possible engine
stall. To restore full REV 5 (FllO/F14B/D)
schedulea nd eliminateS 4 acronym following
an airborne engine mode reset to PRI, recycle
AICS circuit breakers at constant subsonic
Mach number.
I and No. 2 ramp within trail locks and No. 3 ramp in
stow locks are restrainedby trapped hydraulic pressure).
Engine operations may be successful below 1.2 Mach
in this configuration; however, corrective procedures
shall be performed.
Note
Fail-safe operations result in a slight degradation
of cruise and excess thrust performance
because of the off-optimum
configuration.
2.1.3.2 Fail-Safe Mode. The fail-safe mode results
in significantly degraded AICS operation. Mode entry
is indicated by the display of a fail-safe AIC acronym
and illumination ofthe appropriateIN LET caution light.
Under these conditions, the AICS programmer provides
.a shutoff signal to close the ramps’ hydraulic shutoff
valve. If the hydraulic shutoff valve closes below Mach
0.9, the ramps are normally in a safe configuration (No.
Ifthe hydraulic shutoffvalve closes above Mach 0.9,
the ramps are normally in an unsafe configuration and
the appropriate RAMPS caution light will accompany
the INLET caution light (Figure 2-7). Above Mach 0.9,
the No. 3 ramp normally begins programming below the
actuator stow lock. When the fail-safe mode is entered
above Mach 0.9, the unpowered No. 3 ramp will eventually
move and may cause compressor stalls at higher
power settings. The aircrafi shall be deceleratedb elow
1.2 Mach, and the appropriate INLET RAMPS switch
shall be selected to STOW.
2-7 ORIGINAL
NAVAIR Ol-F14AAD-I
Figure 2-7. Ramp Monitor Logic
Do not select STOW at speeds greater than
1.2 Mach. Compressor stalls may occur because
of ramp mispositioning.
2.1.3.3 Stow Mode of Operation. The STOW position
of the INLET RAMPS switch commands the appropriate
hydraulic shutoff valve to open and provides
a direct electrical signal to the ramp actuators, porting
hydraulic pressure directly to the retract side of the actuator.
When the ramps are retracted to the stow position,
the RAMPS light will extinguish and the stow locks
should remain engaged even if hydraulic power is subsequently
lost. Once in STOW, AICS programmerdetected
electronic failures may be reset below
Mach 0.5.
2.1.3.4 Hydraulic Shutoff and Dump inhibit. The
AICS hydraulic systems include a hydraulic shutoff
valve to control hydraulic system pressure. The hydraulic
shutoff valve is normally controlled by the AICS
programmer, which removes the hydraulic-on signal below
0.35M or in the event of a programmer failure. The
STOW position of the INLET RAMPS switch bypasses
the AICS programmer to energize the hydraulic shutoff
valve, providing pressure for ramp motion. To ensure
hydraulic pressure is shut off, the respective AICS programmer
must be deenergized by pulling the circuit
breaker (LFl, left or LGl, right) and the INLET
RAMPS switch placed in the AUTO position. Whenever
the hydraulic shutoff valve closes (i.e., fail-safe
mode entry), hydraulic spool valves in the ramp actuators
sense the absence ofpressure and block the actuator
pressure and return ports, causing a hydraulic lock
(dump inhibit). This feature reduces ramp movement
when an AICS failure occurs and the ramps are not being
restrained by mechanical actuator locks. Although
dump inhibit prevents the ramp from rapidly extending
　
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