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especially slow when approaching turns or stopping areas. Lead turns by as
much as possible considering taxiway width. Nosewheel steering and braking
action may both be affected by lack of traction on slick and frozen surfaces; the
slower the speed, the better the traction. Avoid excessive nose gear steering
deflection. Surface conditions may vary between taxiways and parking areas
due to sanding and de-icing. Expect taxiways on bridges or other elevated areas
to be more susceptible to ice formation than adjacent areas. An icy surface may
be covered by a layer of snow. Melting ice or snow may cause rapid changes in
traction. It is essential that the taxi speed be kept low enough that the aircraft
can be stopped in the space available. Reverse thrust may be used if necessary
to assist in stopping.
Taxi slowly on contaminated taxiways to prevent snow and slush from
impinging on wheel wells, flaps, and engines. Do not taxi through areas of deep
snow or deep slush. A crowned, slippery taxiway or a slick crosswind taxiway
may cause sideways slipping or weathervaning into the wind. Taxi as close as
possible on the centerline and avoid large nose steering inputs. Be aware of
snow banks, as extended flaps are particularly susceptible to damage from such
hazards. Be alert for obscured runway, taxiway, or ramp markings and lights.
The nose steering wheel should be exercised in both directions during taxi to
permit the circulation of warm hydraulic fluid through the steering cylinders.
This will minimize the lag encountered in steering during low temperatures.
When moderate to severe icing conditions are present during prolonged ground
operation, periodic engine run-up to as high a thrust setting as practical (70%
N1 recommended) should be made at 30-minute intervals for approximately one
minute duration.
If a clear, dry run-up area is available during taxi or on the ramp, make a
preliminary power run on the clear dry area in order to prevent an abort which
may occur if check is made on a slick runway.
The shortest possible route to the point of takeoff should be used to conserve
fuel and minimize the amount of ice fog generated by the jet engines. This fog
may delay takeoff by lowering the visibility below takeoff minimums.
Caution: Use extreme caution when taxiing over ice-covered taxiways or
runways, as excessive speed or high crosswinds may start a skid.
Attempt all turns at reduced speed.
737
Flight Manual Continental
Sec. 3 Page 333
Rev. 11/15/02 #41
Taxi speed should be kept as slow as possible to reduce the chance of the nose
gear tires throwing snow and slush up to the ram air inlet area.
WARNING: If the flaps are left up during taxi to avoid slush and ice, the
taxi checklist will be completed after flaps are in the takeoff
position.
Caution: When operating the wing flaps during low temperatures, the flap
position indicators and leading edge device annunciator should be
monitored for positive movement. If the flaps should stop, the
flap control lever should be placed immediately in the same
position as indicated.
Exterior Deicing
Flaps .........................................................................................AS REQUIRED
Prevents ice and slush from accumulating in flap cavities. Flaps should be
up, if possible.
Start Levers.............................................................................AS REQUIRED
If engines are running, do not operate above idle thrust.
Stabilizer Trim...............................................................FULL NOSE DOWN
Set stabilizer to the APL NOSE DOWN limit to prevent deicing fluid and
slush run-off from entering the stabilizer balance panel cavity. Trim the
aircraft to the electrical APL NOSE DOWN LIMIT. Then continue
trimming manually to the APL NOSE DOWN LIMIT.
WARNING: To avoid personal injury, ensure that the stabilizer trim wheel
handle is stowed prior to using electric trim.
Pack Switches..............................................................................................OFF
Engine & APU Bleed Air Switches...........................................................OFF
Reduces the possibility of fumes entering the air conditioning system.
Note: Deicing may occur at various locations such as at the gate or at remote
locations prior to takeoff. Because of this, checklist usage will vary
due to the circumstance.
· Should deicing occur at the gate, the normal BEFORE START,
AFTER START and TAXI checklists will be accomplished in
their normal sequence.
· Should deicing occur at a remote location with the engines shut
down, the normal BEFORE START and AFTER START
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737 FLIGHT MANUAL 737飞行手册2(84)
