snubbers and bearings.
If any flight control is suspected of binding or restricted movement,
maintenance personnel should accomplish the appropriate portion
of the flight control checks in SP.9, supplementary procedures.
Engine Start
Accomplish a normal engine start with the following modifications:
.
If ambient temperature is below -35°C (-31°F), idle the engine for
two minutes before changing thrust lever position.
.
Up to three and one–half minutes may be allowed for oil pressure
to reach the minimum operating pressure. During this period, the
LOW OIL PRESSURE light may remain illuminated, pressure
may go above the normal range and the FILTER BYPASS light
may illuminate. Operate the engine at idle thrust until oil pressure
returns to the normal range.
Copyright . The Boeing Company. See title page for details.
June 4, 2004 SP.16.3
Supplementary Procedures -Adverse Weather 737 Operations Manual
After Start
Electrical power ...............................................................Generators ON Normally the generator drive will stabilize within one minute, although due to cold oil, up to five minutes may be required to produce steady power.
Flight controls ................................................................................Check Move flight controls through full travel to ensure freedom of movement.
Flaps ...............................................................................................Check Move flaps through full travel to ensure freedom of movement.
CAUTION: The flap position indicator and leading edge devices annunciator panel should be closely observed for positive movement. If the flaps should stop, the flap lever should be placed immediately in the same position as indicated.
Engine Anti–Ice Operation–On the Ground
Engine anti–ice must be ON during all ground operations when icing conditions exist or are anticipated.
WARNING:Do not rely on airframe visual icing cues before
activating engine anti–ice. Use the temperature and
visible moisture criteria.
When engine anti–ice is required (on the ground):
ENGINE START switches ....................................................... CONT
ENG ANTI–ICE switches ............................................................ ON
COWL VALVE OPEN lights – illuminated dim
COWL ANTI–ICE lights – extinguished
Note: If COWL VALVE OPEN lights remain illuminated bright with engines at IDLE, position APU BLEED air switch to OFF and increase thrust slightly (up to a maximum of 30% N1).
Copyright . The Boeing Company. See title page for details.
SP.16.4 June 4, 2004
Supplementary Procedures -Adverse Weather 737 Operations Manual
Engine run–up ...............................................Accomplish as required Run–up to as high a thrust setting as practical (70% N1 recommended) at 30 minute intervals for approximately 30 seconds duration.
Wing Anti–Ice Operation–On the Ground
On airplanes with ground operational anti-ice, the wing anti–ice system must be on during all ground operations between engine start and takeoff, when icing conditions exist or are anticipated, unless the airplane is protected by the application of Type II or Type IV fluid in compliance with an approved ground deicing program.
WARNING:Ground use of the wing anti–ice system is intended to complement, and not replace, ground deicing/anti-icing and inspection procedures. Close inspection is still required to ensure that no frost, snow or ice is adhering to the wing, leading edge devices, stabilizer, control surfaces or other critical airplane components at takeoff.
WING ANTI–ICE switch......................................................As required
If wing anti–ice switch is ON:
VALVE OPEN lights – illuminated dim
Note: The wing anti-ice VALVE OPEN lights may cycle bright/dim due to the control valves cycling closed/open in response to thrust setting and duct temperature logic.
Taxi–Out
Nose wheel steering ....................................................................... Check Nose wheel steering should be exercised in both directions during taxi to circulate warm hydraulic fluid through steering cylinders and minimize steering lag caused by low temperatures.
Flaps ......................................................................................As required If taxi route is through slush or standing water in low temperatures or if precipitation is falling with temperatures below freezing, taxi with flaps up. Taxiing with flaps extended subjects the flaps and flap drives to snow and slush accumulations from the main gear wheels. Leading edge devices are also susceptible to slush accumulations.
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