(1) The curved lines on the lower chart show the effect of headwinds on a 65,700 pound airplane.
(a) To find the wind velocity necessary to cause a heavier airplane to pitch, do the step that follows: 1) Multiply the correction factor for the airplane gross
weight by the wind velocity necessary to cause a 65,700 pound airplane to pitch.
(2) The horizontal lines show the effects of side winds on a 65,700 pound airplane.
(a) To find the wind velocity necessary to cause a heavier airplane to yaw, side skid, or roll, do the step that follows: 1) Multiply the correction factor for the airplane gross
weight by the wind velocity necessary to cause a 65,700 pound airplane to yaw, side skid, or roll.
D. The horizontal stabilizer position and CG position do not decrease the effects of side winds, but decrease the effects of headwinds.
NOTE: In the NOSE DOWN setting, the leading edge of the horizontal
____
stabilizer goes up.
(1) To decrease the risk that the airplane will pitch:
-move the CG forward
-set the flaps to full up position ú - set the horizontal stabilizer to zero pilot units. ú
TASK 10-13-00-582-001
2. Park the Airplane (Fig. 201)
_________________
A. References
(1) AMM 10-11-00/201, Normal Parking
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10-13-00
ALL ú ú 02.1 Page 201 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
NOTE: MULTIPLY THE WIND VELOCITY, THAT YOU GOT FROM THE WIND VELOCITY VS. HORIZONTAL STABILIZER POSITION PLOT, BY THE CORRECTION FACTOR TO FIND THE WIND VELOCITY THAT IS NECESSARY TO BADLY AFFECT AIRPLANES WITH GROSS WEIGHTS ABOVE 65,700 POUNDS.
1.0 1.1 1.2 1.3 1.4 1.5
CORRECTION FACTOR
HEADWIND PITCH UP TENDENCY
CG = 5% MAC CG = 30% MAC
140
WIND VELOCITY FOR IMPENDING MOTION
WHILE PARKED - KNOTS
120 ROLLING TENDENCY
100 SIDE SKID, DRY
SIDE SKID, WET
80
YAW TENDENCY, DRY
60
YAW TENDENCY, WET
SIDE SKID, ICY
40
YAW TENDENCY, ICY
20
0
HORIZONTAL STABILIZER POSITION - PILOT UNITS
____FLAPS UP
NOTE: GROSS WEIGHT = 65,700 LB SEA LEVEL STANDARD DAY ZERO GROUND SLOPE PARKING BRAKE SET HEADWIND FOR PITCH WIND DIRECTION IS FOR MOST ADVERSE CONDITION FOR ROLL, YAW AND SIDE SKID ROLLING TENDENCY WIND LIMIT IS INDEPENDENT OF SURFACE CONDITION.
Qualities of the 737 Exposed to Severe Winds
Figure 201
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10-13-00
ALL ú ú 01 Page 202 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
B. Procedure
S 582-011
(1) Park the airplane (AMM 10-11-00).
NOTE: Make sure the area does not have too many airplanes.
____
S 862-012
WARNING: MAKE SURE THE WHEEL CHOCKS ARE CORRECTLY INSTALLED.
_______ IF THE WHEEL CHOCKS ARE NOT CORRECTLY INSTALLED, DAMAGE TO THE AIRPLANE CAN OCCUR DURING HIGH WINDS.
(2) Install the wheel chocks, and apply the parking brakes:
(a) Turn the battery switch to the ON position.
CAUTION: THE PARKING BRAKES WILL HAVE AN EFFECT FOR APPROXIMATELY
_______ 8 HOURS AFTER YOU SET THEM. BEFORE THE 8 HOURS ARE DONE, RELEASE AND SET THE BRAKES AGAIN. THIS WILL MAKE SURE THE HYDRAULIC PRESSURE IS SUFFICIENT TO HOLD THE AIRPLANE. IF THE HYDRAULIC PRESSURE IS NOT SUFFICIENT, THE AIRPLANE CAN MOVE AND CAUSE DAMAGE TO THE AIRPLANE.
(b)
Push the brake pedals and pull up the parking brake handle on the captain's control stand.
(c)
Then, release the pressure on the brake pedals and release the parking brake handle.
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