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buffet is the upper pitch attitude limit. Flight at intermittent stick
shaker may be required to obtain a positive terrain separation.
Smooth, steady control will avoid a pitch attitude overshoot and stall.
Note: Do not use flight director commands.
737
Flight Manual Continental
Sec. 3 Page 309
Rev. 11/15/02 #41
WINDSHEAR AVOIDANCE AND RECOVERY PROCEDURES
The first and foremost rule is to avoid windshear. As enhanced detection and
guidance capabilities become available, the pilot must not perceive these aids as
providing the capability to penetrate windshear.
These aids are intended to be used for avoidance only, in the same manner as
radar is used as an aid in avoiding thunderstorms.
Microburst Windshear Probability Guidelines
Probability
Observation of Windshear
Presence Of Convective Weather Near Intended Flight Path
· With Localized Strong Winds (tower report or observed
blowing dust, rings of dust, tornado-line features, etc.) ..............HIGH
· With Heavy Precipitation (observed or radar indications of
contour, red or attenuation shadow) .............................................HIGH
· Onboard Windshear Detection System Alert
(Reported or Observed) ..................................................................HIGH
· With Rainshower.......................................................................MEDIUM
· With Lightning ..........................................................................MEDIUM
· With Virga .................................................................................MEDIUM
· With Moderate Or Greater Turbulence
(reported or with radar indications).......................................MEDIUM
· With Temperature/Dew Point Spread Between
30 And 50 Degrees Fahrenheit ................................................MEDIUM
PIREP of Airspeed Loss Or Gain
· 15 Knots Or Greater........................................................................HIGH
· Less Than 15 Knots ..................................................................MEDIUM
LLWAS Alert / Wind Velocity Change
· 20 Knots Or Greater........................................................................HIGH
· Less Than 20 Knots ..................................................................MEDIUM
· Forecast Of Convective Weather ....................................................LOW
Sec. 3 Page 310
Rev. 11/15/02 #41 Continental
737
Flight Manual
Note: These guidelines apply to operations in the vicinity (within 3 miles of
the point of takeoff or landing along the intended flight path below
1,000 feet AGL) and the clues should be considered cumulative. If
more than one is observed, the probability is increased. The hazard
increases with proximity to the convective weather. Weather
assessments should be made continuously.
Takeoff Precautions
Airports Without Terminal Doppler Weather Radar
If the preceding conditions exist and PIREPS indicate a windshear of 15 knots
or greater with increasing intensity, delay departure 30 minutes.
If the preceding conditions exist and PIREPS indicate a windshear of less than
15 knots with diminishing intensity, delay departure 15 minutes.
Airports With Terminal Doppler Weather Radar
A MICROBURST ALERT or WINDSHEAR ALERT will be issued by the
tower in conjunction with a clearance to a specific runway. If the clearance does
not contain an alert, the flight crew may assume that no alert exists at the present
time.
If a WINDSHEAR ALERT accompanied by a reported gain of airspeed is
issued, the crew may take off but be alert for sudden airspeed increase. If
airborne the pilot should adjust pitch attitude smoothly to maintain desired
airspeed but should not “chase” large rapid airspeed fluctuations.
If a WINDSHEAR ALERT accompanied by a reported loss of airspeed, or a
MICROBURST ALERT is received, a takeoff should not be attempted. If
either alert is received during takeoff prior to 100 knots the takeoff should be
aborted. If either alert is received after 100 knots the takeoff may be aborted or
continued at Captain’s discretion after considering runway available, gross
weight and related meteorological conditions.
737
Flight Manual Continental
Sec. 3 Page 311
Rev. 11/15/02 #41
Windshear Avoidance Techniques
1. Select the longest suitable runway that avoids suspected areas of windshear.
The choice of a suitable runway involves consideration of exposure to
obstacles after liftoff and crosswind and tailwind limitations.
2. Maximum rated takeoff thrust should be used.
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