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4. Exercise frequent flight instruments scanning.
SUPPLEMENTARY PROCEDURES
Windshear
Vol. 1 06−17−1
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
3. PRECAUTIONARY ACTIONS
Avoidance is still the best course of action to take, in the event that the occurrence of windshear
is known or suspected. Stay clear of thunderstorm cells, heavy precipitation, virga and areas of
known windshear.
Flight crew awareness, preparation and coordination cannot be overemphasized. A thorough
knowledge of, and familiarity with, the phenomenon and the various meteorological conditions
indicative of windshear activity is necessary, if one is to be prepared for the possibility of an
inadvertent encounter. Pilots should be trained adequately to enable them to readily recognize
the indications and/or occurrence of windshear/downburst and take proper action.
When windshear activity is known or suspected at departure:
1. Delay the take-off until conditions are more favorable.
2. Assess the situation during the delay and ensure that a safe take-off is possible.
3. Use maximum take-off thrust instead of reduced thrust.
4. Select the longest runway length available.
5. During the take-off roll, carefully monitor the flight instruments, particularly for airspeed
fluctuations, to detect at the earliest time the possible occurrence of windshear.
6. Consider the use of an increased initial climb speed, if obstacle clearance permits.
7. Be familiar with the normal (all-engine) initial climb pitch attitude, and rotate the airplane at
the normal rate to this attitude. Reduction of the pitch attitude should be delayed until
terrain and/or obstruction clearance is assured, or when the stick shaker is activated.
8. A thorough knowledge of the normal take-off indications of the flight instruments, in
particular those pertaining to the vertical flight path, is a must. Closely monitor the flight
instruments. Any deviation from the normal values of airspeed, airspeed build-up, attitude,
vertical speed, or altitude trend should be called out by the pilot-not-flying.
9. Anticipate a greater than normal control column force requirement to keep the desired pitch
attitude.
10. If windshear is encountered near VR and the airspeed suddenly decreases, there may be
not enough runway length left to accelerate back to the normal VR . If the runway remaining
is not sufficient to reject the take-off, rotate the airplane at a normal rate at least 2,000 feet
before the end of the runway, even if the speed is below VR .
11. Follow the windshear recovery guidance.
12. Remain prepared for further windshear encounters.
When windshear activity is known or suspected at arrival:
1. Delay the approach until conditions are more favorable, or divert to another airport.
2. Use the longest and most favorable runway available.
3. Add an appropriate wind correction to the final approach speed.
4. Fly an “on the slot” approach, and consider the use of the autopilot during the approach, to
allow for more monitoring and recognition time.
5. Be aware of the normal values of the flight instruments during the approach, and constantly
cross-check flight director commands with the vertical flight path instruments.
6. The pilot-not-flying should closely and constantly monitor the flight instruments, paying
particular attention to the vertical flight path instruments (i.e. vertical speed, altitude,
glideslope and airspeed), and call out any deviation from the normal.
SUPPLEMENTARY PROCEDURES
Windshear
Vol. 1 06−17−2
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
3. PRECAUTIONARY ACTIONS (CONT'D)
7. Establish crew coordination and awareness, especially at night or in marginal weather
conditions, and be alert for the possibility of an inadvertent encounter.
8. DO NOT make large thrust reductions or trim changes to correct fluctuations in airspeed,
for they could vary from an increase to a decrease in a very short span of time.
9. If windshear is encountered during the approach, and a significant reduction and/or
increased rate of descent is experienced, immediately execute a go-around and follow the
windshear recovery guidance.
10. Trade the airspeed for altitude. Maintain the go-around pitch attitude until terrain and/or
obstacle clearance is assured, unless the stick shaker is activated.
11. Anticipate the encounter of subsequent windshear activity along the flight path.
If windshear activity was encountered during take-off or approach, promptly inform ATC of the
encounter. The PIREP should include:
• Location where windshear was encountered,
• Altitude where windshear was encountered,
　
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