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during final approach, or the crew recognizes the signs of
increasing performance conditions, the following procedures
should be followed:
1. The flight crew should be alerted to the possibility of decreasing
performance conditions. Coupled with other weather factors,
initiating a go-around as early as possible should be considered.
2. Wind and gust allowances should be added to the approach speed,
increasing thrust if necessary. It may be necessary to disengage
autopilot/autothrottle.
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Quick Reference Handbook
REVISION 7 SUPPLEMENTAL PROCEDURES / DATA
May 30/02 Page S - 3
Windshear / Microburst. ctd… AFM APP E
3. Avoid sinking below the approach glidepath or letting the power
levers remain at flight idle for extended periods of time.
DECREASING PERFORMANCE CONDITIONS:
Significant airspeed and altitude loss may be caused by decreasing
headwind, increasing tailwind and downdrafts.
When conditions exist where low-level windshear, microburst, or
downburst may be present, the pilot should consider diversion to an
alternate airport or delay takeoff or landing until the risk of an
encounter is minimized. If the condition is unavoidable or
unexpectedly encountered, the flight crew may expect a rapid decay in
airspeed and/or an increase in sink rate.
Takeoff:
When the audible "WIND SHEAR--WIND SHEAR--WIND SHEAR"
WARNING occurs, and the red WS WARN annunciator (if
installed) is illuminated during takeoff, or the flight crew
recognizes the signs of decreasing performance conditions, the
following procedures should be followed:
1. The flight crew should be alerted to the possibility of subsequent
decreasing performance conditions.
2. Increase power to maximum thrust.
3. Rotate at 3 to 4 degrees per seconds to increase pitch attitude to
the highest possible value.
4. When stick shaker is encountered, or as V2 is approached, reduce
pitch rate/angle of attack to intercept V2 -20 KCAS.
5. Engine overboost should be avoided unless the airplane continues
to descend and airplane safety is in doubt. When airplane safety
has been assured, adjust thrust to maintain engine parameters
within approved limits.
6. DO NOT retract flaps or landing gear until safe climb-out is
assured.
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Quick Reference Handbook
SUPPLEMENTAL PROCEDURES / DATA REVISION 7
Page S - 4 May 30/02
Windshear / Microburst. ctd… AFM APP E
Approach / Landing:
When the audible "WIND SHEAR--WIND SHEAR--WIND SHEAR"
WARNING occurs, and the red WS WARN annunciator (if
installed) is illuminated during final approach, or the flight crew
recognizes the signs of decreasing performance conditions, the
following procedures should be followed:
1. The flight crew should be alerted to the possibility of subsequent
decreasing performance conditions.
2. Increase power to maximum thrust.
3. Rotate at 3 to 4 degrees per seconds to increase pitch attitude to
the highest possible value.
4. When stick shaker is encountered, or as V2 is approached, reduce
pitch rate/angle of attack to intercept V2 -20 KCAS.
5. Engine overboost should be avoided unless the airplane continues
to descend and airplane safety is in doubt. When airplane safety
has been assured, adjust thrust to maintain engine parameters
within approved limits.
6. DO NOT retract flaps or landing gear until safe climb-out is
assured.
END
Volcanic Ash Encounter AFM APP E
Flight through volcanic ash should be avoided. If volcanic ash is
encountered, reverse course to clear the ash cloud and inform ATC.
The autothrottle should be disconnected. A low power setting is
recommended (idle is preferred), with airstart ignition OFF.
Volcanic ash may be difficult to detect, however, flight crews have
reported the following indications:
• Smoke and dust with acrid odor, similar to electrical smoke,
appearing in cockpit.
• Engine malfunction, e.g., a surge condition with increasing TGT
and/or flameout.
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Quick Reference Handbook
REVISION 8 SUPPLEMENTAL PROCEDURES / DATA
Oct 11/02 Page S - 5
Volcanic Ash Encounter, ctd… AFM APP E
• At night, St. Elmo's fire and/or static discharge may be seen
around the windshield. (If static discharge is observed, select the
windshield heat OFF.)
If one or both engines flame out, an immediate relight is not
recommended until clear of ash cloud.
If both engines flame out and as RPM is decreasing, perform the
following steps IMMEDIATELY:
1. Reverse course to clear the ash cloud and inform ATC or
　
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