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exercises the complete AICS for preflight failure detection,
and ensures the ramps are in their stow locks.
OBC is the only way to ensure stow lock integrity
since it verities the ramps are in the stowed position
and then removes ramp hydraulic power. Detected
AICS failures are indicated by AIC acronyms or AIC
acronym(s) with associated INLET caution light(s)
displayed after completion of OBC.
Figure 2-2. AICS Control and Indicators (Sheet 2 of 2)
Note
l With INLET RAMP switches in STOW,
AICS OBC will fail test and INLET lights
will illuminate.
l If the engine enters secondary mode dnring
OBC, the ramps will stow and fail
OBC. To reinitiate OBC, select primary
mode and reset the AICS.
l AnS4acmnymindicatestheAICSpmgrammers
may be operating on the REV 4 (TF-
30/F14A) schedule. As a result, below
25,000 feet at airspeedsg reater than 1.1
Mach, unloading the aircraft to less than Ig
will reduce inlet stability and may result in
inlet buzz and possibly an engine stall. Cycling
AICS circuit breakers at a constant
subsonic Mach number should eliminate
the S4 acronym and reset the programmer
to the REV 5 (F-l 10) schedules.
2.1.3 AICS Failure Modes of Operation. AICS
mode of operation following a BIT-detected failure may
be either fail-operational mode (Figure 2-5) or fail-safe
mode (Figure 2-6).
2.1.3.1 Fail-Operatlonal. Failures in the AICS are
detectedb y the AICS programmer,w hich automatically
initiates appropriate corrective action. Mode entry is
indicated by the display of a fail-operational AIC acrenym.
The fail-operational mode results in no significant
degradation in AICS operation, and the mission can be
continued without any flight restrictions or corrective
action by the pilot.
ORIGINAL 2-4
NAVAIR Of-FI4AAD-1
--
---
-__Z ----
SlmoNlC
------ ---- -4
OlWJSER
-__--- -+
--
--
-- --
SHOCK WAVES
Figure 2-3. Variable-Geometry Inlet Configuration
2-5 ORIGINAL
NAVAIR Ol-Fl4AAD-1
HYDRAULIC POWER
FLIGHT CONDITION RAMP ACTUATORS
M<0.35 OFF
M20.35 to ~0.5 ON
M>0.5 to <2.2 ON
M>2.2 ON
ACTIVATOR POSITION
RAMP NO. 1 1 RAMPNO. ) RAMPNO.
Mechanically restrained by stow locks in stowed position;
electrical stow commands output from AICS programmer.
Electrical stow commands output from AICS programmer.
Variable position scheduled by AICS programmer as a
function of math number, corrected engine fan speed, and
angle-of-attack. Ramps no. 1 and no. 2 begin positioning at
Mach 0.5; ramp no. 3 beglns at Mach 0.9.
Variable posltlon scheduled by AICS programmer as a
function of Mach number.
Figure 2-4. AICS Normal Operating Mode
FAILURE
MAINTENANCE DETECTED
IEADOUT ACRONYM FAILURE CAUSE
AIC Sl P,, Pt, or Limits exceeded.
(Possible only durlng programmer out of
OBC) calibration
NONE Englne fan speed
rpm from AFTC.
Loss of englne fan
speed slgnal.
;
AIC 54
(During OBC)
Alpha delta pressure Llmlts exceeded.
sensor out of Augmenter fan
calibration or engine temperature
fan speed. controller (AFTC)
may be In secondary
mode.
AIC A4 Open wire Open wire
-r
f
I
(
I
I
,
I
I
RESULT
qamps may not program during OBC.
beset AICS Land R circuit breakers
:LFi, LGl) prior to attempting another
3BC.
Substitutes 7,399 rpm. Ramps do not
lrogram durlng OBC.
Mask continuous monitor (CM) so that
subsequent AIC acronyms are
displayed.
IN FLIGHT: Substitutes +2’
Bngle-of-attack or 7,390 rpm.
l Substitutes +2O angle-of-attack
value until reset.
l Substitutes 7,300 rpm.
None
AIC symbol has Lor R appended (AICL, AICR) to
identify on tilch side failure was detected.
Figure 2-5. Fail-Operational Mode -No INLET Light
ORIGINAL 2-6
NAVAIR Ol-Fl4AAD-1
1
/
I
I
I
I
I
I
(
f
F
(
FAILURE RESULT
MAINTENANCE DETECTED
READOUT ACRONYM FAILED CAUSE MACH co.5 MACH 20.5
4lC P AICSprogrammer Failed end-to-end
P)
Hydraulic shutoff Ramp movement is
BIT valve remains
4lC si
restrained by
closed. Ramp actuator
Static pressure (P,) Minimum or actuators remain mechanical locks if
4lC s2 maximum limits mechanically failure occurred
Total pressure (Pd exceeded restrained within with ramps within
stow locks, locks. Otherwise
provided they ramp(s) move
　
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