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length or braking conditions warrant, make
an arrested landing.
NAVAIR Ol-F14AAD-1
1456.1 Transfer to SEC Mode Results
1. SEC mode transfer from AB may result in pop
stalls.
2. Nozzle folly closed (higher taxi thrust).
3. Stall warning is inoperative (engine overtemp
warning still available).
4. No nozzle position indication.
5. No AB capability.
6. Decrease stall margin at low rpm.
7. 65 to 116 percent basic engine thrust available
(see Figure 14-4).
8. Main engine ignition continuously energized.
9. No idle lockup protection.
10. IGV fixed full open (lower windmill airspeed).
11. RATS inoperative.
145.7 Uncommanded SEC Mode Rpm Decay
Engine will flameout iftransfer is delayed to
below 59-percent ‘pm.
1. ENG MODE SELECT - PRI (greater than 59-
percent rpm).
If PRI mode is restored:
2. Maintain constant subsonic airspeed in level
flight.
pii-1
If WING SWEEP advisory light is illuminated,
cycling L AICS circuit breaker (LFl)
may cause unintentional wing sweep unless
WING SWEEP DRIVE NO. 1 (LDl) and
WG SWP DRNO. 2/MANUV FLAP (LEl)
cb’s are pulled.
3. Affected L or R AICS cb - Cycle (LFl, left or
LG 1, right).
NAVAIR Ol-F14AAD-1
% OF PRIMARY THRUST FllO-GE-400 ENGINE
_ 35 i I
--
\ I
85 \ :
- I / I’
30
j
-
I’ -. __---
2-c
_- -- -- 92
0 I I I I I I I I I 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
MACH NUMBER
0.FSOD-21
Figure 14-4. Secondary Mode Thrust Levels
ORIGINAL 14-14
14.58 Uncommanded Engine Acceleration Airborne
(No Throttle Movement). Uncommandedengine
accelerationis characterizebdy an increasei n thrust
without throttle movement as a result of an AFTC or
MEC failure normally associated with one engine. Selection
of the ENG MODE SELECT switch(es) to SEC
may restore throttle authority.
1. EN0 MODE SELECT - SEC.
If dual engineuncommanded acceleration is associated
with CADC failure, normal primary mode may be regained
by reselecting PRI mode with the gear handle
down.
If engine is still uncommanded and engine shutdown is
necessq:
2. Throttle (affected engine) - OFF.
3. Refer to Single-Engine Cruise Operations, parsgraph
14.5.3.2.
14.5.9 Exhaust Nozzle Failed (No Nozzle Response
to Throttle Movement). Nozzle position
is hydraulically operated by engine oil from a separate
compartment in the oil storage tank. A rupture in this
system could render the nozzles inoperative and would
generally cause the nozzles to blow open. This could
result in engine mislight, AB blowout, and low thrust.
Exhaust nozzles failed closed could result in engine
stalls if afterburneris selected,a nd excessr esidualt hrust
will be present on landing rollout. An exhaust nozzle
electrically failed open may be closed by selecting SEC
mode.
1. Monitor engine oil pressure/rpm.
2. Throttles - Basic Engine Only (use minimum
power required).
Note
. SEC mode transfer while in AB may result
in pop stalls. Nonemergency manual
selection of SEC mode should be performed
in basic engine with the power set
above 85-percent rpm.
. If the fan speed limiter circuit has failed,
engine rollback may occur with the selection
of SEC mode. In the event of engine
rollback, PRI mode must be reselected
above 59-percent rpm or flameoutwill occur
and an airsWt will not be possible.
3. ENG MODE SELECT - SEC.
NAVAIR Ol-FlI)AAD-1
Note
In SEC mode, nozzle indicator is inoperative.
4. Obtain visual inspection.
If nozzle is open in SEC mode or abnormal response:
5. ENG MODE SELECT - PRI.
6. Assume mechanical failure and land as soon as
practicable.
If nozzle is closed or a visual inspection is not possible:
5. ENG MODE SELECT- Remain in SEC.
6. Assume electrical failure and land as soon as
practicable.
14.510 Stuck/Jammed Throttle(s). One or both
throttles may become jammed in the afterburner range
because of misadjustments or FOD within the throttle
quadrant. Selection of SEC mode may be required to
control rapid fuel consumption and airspeed and/or
altitude. Ifthe problem cannotb ec orrected,e ngines hutdown
with the fuel shutoff handle may be necessaryt o
abort a takeoff, to control a stalled engine, or to effect a
safe landing. If the afterburner detent lever is misadjusted,
the right throttle may not move inboard through
the AB detent into the basic engine range.
An additional failure mode has been identified that
may cause one or both throttles to become stuck in the
　
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