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windshield.
10. Reduce airspeed and lower the landing gear at the last possible moment (minimizes ice
accumulation on the gear).
If a missed approach is necessary -
11. Slowly advance throttles to the minimum power required for a safe waveoff.
12. Raise landing gear and flaps as soon as possible.
Post-flight -
13. Report all icing encounters (INLET ICE caution) on VID MAF to ensure the engine is inspected
for FOD before the next flight.
20.1.3 Landing in Heavy Rain. Refer to the Wet Runway Landings section in chapter 7.
If landing in heavy rain -
1. WINDSHIELD switch - RAIN
Do not operate the windshield anti-ice/rain removal system on a dry
windshield. If a WDSHLD HOT caution appears, place the WINDSHIELD
switch to OFF immediately after landing to prevent heat
damage to the windshield.
For wet (standing water) runway conditions -
2. Reduce gross weight to minimum practical.
3. ANTI-SKID switch - VERIFY ON (shore based)
4. Land onspeed or slightly slow with the power reduced to IDLE as soon as possible.
If directional control is comfortable after touchdown -
5. Use maximum antiskid braking to minimize landing distance.
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VI-20-3 ORIGINAL
If directional control problems occur -
6. Do not hesitate to add power and go around.
7. Make arrested landing, if possible.
20.2 TURBULENT AIR AND THUNDERSTORM OPERATION
Intentional flight into lightning or thunderstorms is prohibited. If penetration is unavoidable, fly at
optimum cruise airspeed but not less than 250 KCAS if above 35,000 feet MSL.
The radar MAP mode can be used to detect storm cells.
1. SURF MAP mode - select (NAV or A/G)
2. RANGE SCALE - select (AS DESIRED)
3. ANTENNA ELEVATION - Raise to horizon. Make sure the radar antenna is raised sufficiently
to preclude radar returns from the ground. The RDR ATTK format should display areas of
precipitation. If possible, deviate flightpath to avoid these areas.
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VI-20-4 ORIGINAL
CHAPTER 21
Hot Weather Procedures
21.1 GENERAL
On the ground, the avionics ground cooling fan should provide adequate avionics cooling up to an
ambient temperature of approximately 103°F. Inflight, the ECS controller should provide adequate
avionics cooling at all conditions.
With outside air temperature greater than 103°F, fuel recirculation through the heat exchangers
during ground operations may be insufficient at IDLE RPM to keep engine and AMAD oil temperature
within limits. Increasing the affected engine rpm increases circulation and should clear an OIL HOT
caution within 20 seconds (normal operating system).
Under adverse conditions (i.e. hot, heavy, and forward CG), takeoff speeds may be significantly
higher than those seen at nominal conditions. Knowing the aircraft predicted takeoff performance
should prevent a high speed abort in what is a normally functioning aircraft.
21.2 GROUND OPERATIONS
If OAT is approaching or is above 103¡F -
1. Non-essential avionics equipment (radar, TCN, IFF, etc.) ON and BIT then OFF (if required)
2. Consider increasing one engine at or above 74% N2 rpm (if possible)
3. ENG format - Monitor ENG OIL TEMP (149°C) and AMAD OIL TEMP (88°C)
4. Avionics equipment - ON JUST PRIOR TO TAKEOFF
If AV AIR HOT or L or R OIL HOT cautions appear -
5. Perform the appropriate caution corrective action procedures.
The AV AIR HOT caution corrective action procedures should remove the caution if the ECS system
is operating normally. If the caution cannot be cleared with the ECS MODE switch in AUTO,
maintenance action is required.
21.3 INFLIGHT
At nominal ambient conditions, the aircraft fuel system should provide adequate cooling for the
FADECs and subsystem accessories. With extremely hot ambient conditions, feed tank fuel temperatures
can approach the 59°C inflight limit. During low altitude flight in hot conditions, particularly
with a low fuel state, an L or R FUEL HOT caution may appear. If sufficient cooling is not available,
the L or R FADEC HOT or L or R OIL HOT cautions may also appear.
If OAT is approaching or is above 103¡F -
1. Monitor feed tank fuel temperatures.
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VI-21-1 ORIGINAL
If the L or R FUEL HOT, FADEC HOT, or OIL HOT cautions appear -
2. Perform the appropriate corrective action procedures.
3. Land as soon as practical.
21.4 DESCENT/RECOVERY
The windshield may fog rapidly under conditions of very high aircraft descent rates and high
humidity. In such conditions, consider preheating the windshield by placing the DEFOG handle to
HIGH. If possible, the maximum comfortable cockpit temperature should be maintained to aid in
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NATOPS Flight Manual 飞行手册 2(71)
