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9. LDG GEAR handle - DN
10. FLAP switch - HALF or FULL
11. Fly a straight-in approach (if practical).
12. Fly on-speed AOA to touchdown.
(ATC is not available)
A1-F18EA-NFM-000
Figure 12-1. Warning/Caution/Advisory Displays (Sheet 41 of 55)
V-12-43 ORIGINAL
FCES CAUTIONS
INDICATOR · CAUSE / REMARKS CORRECTIVE ACTION
NWS
FCES
Caution Light
· Nosewheel steering malfunction/failure (mechanical
or electrical).
When failed, the NWS or NWS HI cue is removed
from the HUD. The NWS system reverts to
a 360° free-swiveling mode. If NWS was lost due to
a FCS CH 2 or CH 4 failure, emergency high gain
NWS can be provided by unlocking the wings.
Single channel NWS operation prevents detection
of NWS command failures. Disengage NWS if uncommanded
motion occurs.
GROUND
For emergency high gain NWS -
1. WINGFOLD switch - HOLD or FOLD
2. Pull failed channel circuit breaker.
3. NWS button - PRESS and RELEASE
When emergency high gain NWS mode is entered,
NWS indications may not be displayed on the
HUD. As a result, inadvertent nosewheel steering
actuation may injure ground personnel.
If FCS CH 4 failed -
2. NWS button - PRESS and RELEASE
If FCS CH 2 failed -
2. NWS button - PRESS and RELEASE
3. Paddle switch - PRESS
4. NWS button - PRESS and RELEASE
INFLIGHT
1. Consider a precautionary arrested landing (if
available).
A1-F18EA-NFM-000
Figure 12-1. Warning/Caution/Advisory Displays (Sheet 42 of 55)
V-12-44 ORIGINAL
HYD CAUTIONS
INDICATOR · CAUSE / REMARKS CORRECTIVE ACTION
HYD 1A
· HYD circuit 1A pressure low (<1,400 psi).
HYD 1A is the first circuit shutdown during reservoir
level sensing (RLS) operation for HYD 1.
If caution remains without switching to HYD 1B,
the leak was successfully isolated in HYD 1A.
There is no effect on system operations for a
HYD 1A failure. Following loss of HYD 1A, the
right aileron switching valve should switch to the
backup circuit. If the surface Xs, there is no hazard
associated with multiple FCS RESET attempts to
restore the surface.
1. Slow below 380 KCAS (if practical).
If right aileron Xs -
2. FCS RESET button - PUSH (multiple times if
required)
If right aileron not restored -
3. Refer to Hydraulic Flow Diagram and the appropriate
FCS procedures.
If caution remains with no FCS Xs -
3. Land as soon as practical.
HYD 1B
· HYD circuit 1B pressure low (<1,400 psi).
HYD 1B is the second circuit shutdown during
RLS operation for HYD 1. If caution remains,
the leak was successfully isolated in HYD 1B.
There is no effect on system operations for a
HYD 1B failure. Following loss of HYD 1B, the left
rudder and left LEF switching valves should switch
to their backup circuits. If either surface Xs, there
is no hazard associated with multiple FCS RESET
attempts to restore the surface.
1. Maintain airspeed below 380 KCAS (if practical).
If left rudder or left LEF X -
2. FCS RESET button - PUSH (multiple times if
required)
If either surface not restored -
3. Refer to Hydraulic Flow Diagram and the appropriate
FCS procedures.
If caution remains with no FCS Xs -
3. Land as soon as practical.
HYD 1A
HYD 1B
· HYD circuits 1A and 1B pressure low (<1,400
psi).
(1) Both circuits lost due to a HYD 1 leak which
could not be isolated by RLS.
(2) HYD pump shaft shear (simultaneous cautions
with no pressure fluctuations).
(3) HYD pump internal failure (simultaneous
cautions). May be accompanied by pressure
fluctuations or the HYD1 HOT caution.
(4) Power transmission shaft failure (accompanied
by L GEN, L DC FAIL, and L BOOST
LO cautions).
If dual HYD 1A and 1B cautions were caused by
a loss of fluid (RLS cycling), there should be no
hazard associated with leaving the engine running
at IDLE.
1. Throttle affected engine - IDLE
2. Slow below 380 KCAS (if practical).
3. HYD pressure gauge - Check for pressure fluctuations.
If pressure fluctuations noted and RLS not
cycled -
4. Throttle affected engine - OFF
If HYD1 HOT caution never displayed -
5. Consider restart for landing.
If single engine -
6. Refer to Single Engine Approach and Landing
Procedure.
7. Land as soon as practical.
If no pressure fluctuations or RLS cycled -
4. Land as soon as practical.
If left rudder, right aileron, or left LEF X -
1. FCS RESET button - PUSH (multiple times if
required)
　
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