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missed approach should be executed if the MICROBURST
ALERT or a WINDSHEAR ALERT, accompanied by a reported
airspeed loss of greater than 20 knots, is received.
An increase in airspeed and ballooning above the glideslope may be first
indications of a windshear. Do not make large thrust reductions. This increase
in performance may be followed soon by a rapid airspeed loss and an additional
loss of performance due to a downdraft. The pilot may choose to accept this
initial airspeed gain anticipating an equal or greater loss.
Recovery Maneuver
The following actions are recommended whenever flight path control becomes
marginal below 1000 feet AGL on takeoff or approach. As guidelines, marginal
flight path control may be indicated by deviations from target conditions in
excess of:
· ± 15 knots indicated airspeed
· ± 500 FPM vertical speed deviation from normal
· ± 5 degrees pitch attitude change
· ± 1 dot glideslope displacement
· Unusual throttle position for a significant period of time.
Exact parameters cannot be established. In certain situations where significant
rates of change occur, it may be necessary to go-around before any of the above
are exceeded. The determination to begin the recovery procedure is subjective
and based on the pilot’s judgment of the situation.
Sec. 3 Page 314
Rev. 11/15/02 #41 Continental
737
Flight Manual
If flight path control becomes marginal at low altitude, initiate the windshear
recovery maneuver without delay. If ground contact appears imminent, either
pilot calls “MAX THROTTLE.” Accomplish the first three steps
simultaneously:
· Disengage the autopilot and autothrottles.
· Aggressively advance throttles to mechanical stops to ensure maximum
thrust is obtained with minimum delay. This max throttle setting is
recommended until positive indications of recovery are confirmed. Positive
indications of recovery include:
A. Altimeter and IVSI indicate level flight or a climb; and
B. Airspeed stable or increasing; and
C. Aural, visual warnings cease (stick shaker, windshear warning).
Note: If positive indications of recovery are confirmed while advancing
the throttles to the mechanical stops, the power setting for
continuous recovery to normal flight parameters may be limited to
maximum rated thrust (i.e., go-around thrust) to avoid
unnecessarily exceeding engine limitations.
· Rotate initially toward a 15 degree pitch attitude at normal rotation rate.
Stop rotation immediately if stick shaker or buffet should occur. Roll wings
level if in a turn to provide maximum lifting force.
Note: With the flight director in the takeoff mode, the command bars
will provide correct flight path guidance during a windshear
encounter on takeoff.
· Monitor vertical speed, attitude, and altitude. If the aircraft develops a sink
rate, increase pitch attitude smoothly and in small increments to achieve
zero or positive vertical path. Always respect stick shaker and use
intermittent stick shaker as the upper limit for pitch attitude.
· Do not change flap, gear, or trim position until terrain contact and/or loss of
airspeed is no longer a factor.
Note: After liftoff or initiation of a go-around, adjust pitch to achieve a
positive vertical flight path. Although exact criteria cannot be
established, a target pitch attitude of 15 degrees should provide a
positive vertical path. Keeping a positive or zero rate of climb is
the major objective. Airspeeds below normal must be accepted at
least temporarily. Control pitch attitude in a smooth, steady
manner to avoid overshooting the attitude at which stall warning is
initiated. Heavy and unusual control column forces (up to 30 lbs.)
may be required.
737
Flight Manual Continental
Sec. 3 Page 315
Rev. 11/15/02 #41
Speed is the least important item. If the pilot attempts to regain lost
airspeed by lowering the nose, the combination of decreasing airspeed and
decreasing pitch attitude produces a high rate of descent. Unless this is
countered by the pilot, a critical flight path control situation may develop
rapidly.
· The pilot not flying should focus attention on vertical path, altitude, and
pitch attitude. Inform the Pilot Flying of impending and negative vertical
speeds by a callout of “SINK RATE.” The Pilot Flying should focus
attention on pitch attitude and flying the aircraft.
· Windshear ends when the tailwind component stops increasing.
Crew Coordination
The Pilot Flying should focus attention on flying the aircraft. In a windshear
　
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