09 April 2004 CAUTION
landings should not WIND SHEAR AHEAD
be attempted into a WIND SHEAR AHEAD
known wind shear
are within 5NM of
the intended track.
If heavy rain or thunderstorm activity is known
to exist near the airport, conceder the following:
Use MAX thrust if possible. W
Use the longest suitable runway.
Use flaps 15 unless limited by obstacle clearance
And/or climb gradient.
Use the FD for takeoff and initial climb.
Develop an awareness of the normal values of I 25
airspeed, attitude, and vertical speed. N
Predictive wind shear(PWS) is activated by the following: 0.5 nm
Manually when WXR switch selected,
on the EFIS control panel.
Or automatically when throttles are
set for takeoff.
Automatically in the air when below
2300 feet AGL.
Pushing TO/GA switch
Pushing TO/GA switch WIND SHEAR AHEAD after lift off removes T.O
above 80 kts, disarms WIND SHEAR AHEAD derates.
LNAV and VNAV.
If wind shear is encountered
near VR speed and airspeed
V1 VR suddenly decreases.
There may not be sufficient
runway left to accelerate to
normal take off speed,
initiate a normal rotation at
MAX THRUST least 2000 feet before the
In EEC normal mode: end of the runway.
MAX rated thrust is available in any Once air borne, perform the
phase of the flight by moving the wind shear escape maneuver.
throttles to the full forward position.
In EEC alternate mode: For PWS WARNING prior V1, reject takeoff.
Thrust protection is not available. NOTE
Over boost or fire walling the There may not be sufficient runway
throttles should only be considered as remaining to stop if an RTO is initiated
the last action and terrain contact is at VI.
Alerts priorities: Select the WXR on the EFIS panel prior
1. GPWS wind shears WARNING. takeoff.
2. Terrain warning. This prevents nuisance messages EICAS
3. PWS. advisory wind shear sys message to be
4. TCAS. displayed. (Following a power interrupt)
Approach and landings
A stabilized approach should be established no lower than 1000 feet AGL.
Use flaps 30.
Use autopilot and auto throttles.
A longer runway provides the greatest margin for increased ground roll.
Avoid large thrust reductions, or trim changes.
Monitor vertical flight path instruments for uncontrolled changes
Below 1000 feet AGL, in excess of any of the following:
15 knots IAS.
500 FPM VS.
5 degrees pitch attitude. GO AROUND
One dot displacement from the glide slope.
unusual throttle position for a significant
period of time.
MONITOR RADAR 3.0 nm
For PWS CAUTION alert
Maneuver as required to avoid the
For PWS WARNING alert W
Perform the wind shear escape maneuver, A
Or at captain discretion, perform a R
normal go-around. N
N 0.5 nm
GO AROUND G
Pushing TO/GA switch a
second push after GO around.
A/T will go to full thrust.
Pilot flying Pilot not flying
MANUAL FLIGHT AUTOMATIC FLIGHT MANUAL FLIGHT AUTOMATIC FLIGHT
>Disconnect AP. >Push TO/GA. >Assure MAX thrust >Assure MAX thrust
>Push TO/GA. is set. is set.
>Aggressively apply >verify TO/GA mode (MAX rated thrust)
MAX thrust. annunciation. >Verify all actions
>Disconnect auto >Verify all actions have been completed
throttles. >verify thrust have been completed >Monitor VS and
>Roll wings level and advances to GA power and call out any altitude.
rotate toward 15 omissions.
pitch attitude. >Retract speedbrakes >Call out any trend
>Retract speed toward terrain
brakes >monitor system contact, or
>Follow flight performance. significant
director TO/GA airspeed changes.
Do not change gear or flap configuration until wind shear is no longer factor.
Monitor VS and altitude.
Do not attempt to regain lost airspeed until wind shear is no longer a factor.