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A1-F18EA-NFM-000
Figure 12-1. Warning/Caution/Advisory Displays (Sheet 21 of 55)
V-12-23 ORIGINAL
DDI Cautions and Caution Lights
INDICATOR · CAUSE / REMARKS CORRECTIVE ACTION
INLET ICE
· Engine inlet icing conditions detected.
The INLET ICE caution is designed to come on
when 0.025 inch of ice has accumulated on the inlet
ice detector, which is located in the left inlet. Any
delay in activating the engine anti-ice system can
result in ice accumulating rapidly on the IGVs and
shedding into the engine when the system is turned
on. Ice accumulation on the LEFs is similar to the
inlet lip and can serve as an indication of how much
ice may be on the inlet. As little as 0.5 inch of ice
ingested by the engine from the inlet lip can result
in compressor stalls and major FOD.
With ice clearly visible on the LEFs, reducing
throttle settings below 80% N2 rpm while descending
below the freezing level should generate sufficient
inlet spillage to shed inlet ice outside the inlet
and not into the engine. Similarly, avoiding throttle
transients above 90% N2 rpm, abrupt maneuvers,
and bank angles over 20° should help prevent ice
from detaching from the inlet lip.
With no ice visible on the aircraft, an INLET
TEMP of at least +5°C should provide sufficient
aerodynamic heating to prevent ice accumulation on
the LEFs and inlet lips.
1. ENG ANTI ICE switch ± ON
2. PITOT ANTI ICE switch ± ON
If no ice is visible on the LEFs -
3. Airspeed - Increase until INLET TEMP is at
least +5°C (+10°C preferred) on ENG format
(if possible).
4. Climb or descend out of icing danger zone.
(> 25,000 feet, < -30°C OAT, or below freezing
level)
When clear of icing conditions -
5. ENG ANTI ICE switch - OFF
If ice is visible on the LEFs -
3. Throttles - Reduce below 80% N2 rpm (if possible).
Avoid throttle transients above 90% N2
rpm.
4. Airspeed - Maintain above 250 KCAS.
5. AOA - Maintain less than 6° (if possible) to
prevent ice accumulation on underside of LEX.
6. Avoid abrupt maneuvers and bank angles over
20°.
7. Descend below the freezing level.
For landing -
8. WINDSHIELD switch - ANTI ICE or RAIN
(as required)
9. Reduce airspeed and lower the landing gear at
the last possible moment (minimizes ice accumulation
on the gear).
If a missed approach is necessary -
10. Slowly advance throttles to the minimum power
required for a safe waveoff.
11. Raise landing gear and flaps as soon as possible.
INS ATT
· HUD displayed aircraft attitude is supplied by
the standby attitude indicator.
W replaces O on the HUD. GPS functions
still operate.
1. ATT switch ± STBY
2. Verify HUD pitch ladder coincides with the
standby attitude reference indicator.
3. Attempt an inflight alignment. (INS knob -
IFA)
If IFA unsuccessful -
4. Refer to HIAOA procedure.
INS DEGD
· INS failure detected during periodic BIT.
GPS function still operates. ABLIM function may
not be available.
GROUND
1. INS knob - OFF then realign (GND, CV, or
IFA)
INFLIGHT
If INS information is incorrect -
1. ATT switch - STBY
2. Position keeping source - ADC
3. Attempt an inflight alignment. (INS knob -
IFA)
LADDER
· Boarding ladder unlocked or not completely
stowed.
If the ladder deploys inflight, it may FOD the left
engine.
INFLIGHT
1. Reduce airspeed to the minimum practical.
2. Get a visual inspection (if practical).
3. Land as soon as practical.
A1-F18EA-NFM-000
Figure 12-1. Warning/Caution/Advisory Displays (Sheet 22 of 55)
V-12-24 ORIGINAL
DDI Cautions and Caution Lights
INDICATOR · CAUSE / REMARKS CORRECTIVE ACTION
MC 1
· Mission computer 1 failed.
With MC1 failed, the only cautions available are
MC 1, HYD 1A, HYD 1B, HYD 2A, HYD 2B, NO
RATS, and AUTO PILOT. The GPS function does
not operate, so the GPS assisted velocity vector enhancement
is disabled. With MC1 failed, the
g-limiter defaults to 7.5 g, even though the G-LIM
7.5G caution is not displayed. RATS function inoperative.
With MC1 failed, the UFCD reverts to the
top level CNI format. All top level CNI functions
are operable (MC2 backup); however, the A/P option
is removed, and the autopilot is inoperative.
1. MC switch - CYCLE to 1 OFF then NORM
If caution remains -
2. Use no more than ½ lateral stick with tanks or
A/G stores on the wings.
　
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本文鏈接地址：NATOPS Flight Manual 飛行手冊(cè) 2(28)