(5)
While taxiing the airplane, the center of gravity (CG) must always be within the ground stability limits shown in Fig. 201. Determine airplane center of gravity for the current configuration using component weight and CG computing methods in approved weight and balance manuals.
(6)
Clearance when passing a parked airplane or other obstacle should be maintained. If the APU in either airplane is operating, the taxi maneuver must be made so as to provide a minimum clearance of 50 feet between the APU exhaust port and the adjacent airplane's wingtip (fuel vent).
(7)
The normal taxi speed should not exceed approximately 20 knots. Speeds in excess of this when combined with long taxi distances cause heat buildup in the tires. When approaching a turn, speed should be slowed to that appropriate for the conditions. On a dry surface, use approximately 8 to 12 knots.
(8)
Whenever possible, finish taxiing in a straight line roll for a minimum of 12 feet to eliminate torsional stresses remaining in landing gear components and tires.
(9)
Taxiing under adverse weather conditions requires increased awareness of pavement surface conditions and taxi speeds. If the taxi ways are covered with snow, slush, or ice, the use of the anti-ice system should be considered. Taxi with flaps up. When taxiing on a slick surface at reduced speeds, use of differential engine thrust will assist in maintaining airplane momentum through a turn. Light differential braking may be more effective than nose wheel steering on very slick surface.
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9-20-0 Page 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/88
2. Airplane Characteristics
A. Figure 202 shows the minimum turning radius capability for the airplane. The wingtip describes the largest arc while turning and determines the minimum obstruction clearance path. Basic factors that influence the geometry of a turn are as follows:
(1)
Nose wheel steering angle
(2)
Engine power settings
(3)
Center of gravity location
(4)
Airplane gross weight
(5)
Pavement surface condition
(6)
Airplane ground speed
(7)
Amount of differential braking
B. The operating characteristics of jet powered airplanes necessitate care to prevent injury to personnel and damage to property. Personnel must not only avoid the engine inlet, but also the exhaust nozzle, where hot, high velocity gases are discharged. The velocity of the fan discharge air, particularly at high thrust settings, is sufficiently high to cause serious injury or fatality. When the thrust reverser is in the reverse position, the fan air is discharged forward while the exhaust gasses are still discharged rearward. Figure 203 shows the engine hazard areas at idle and breakaway thrust.
C. Figure 204 shows the angles of view from the flight deck for a crewman in the left seat with seat properly adjusted.
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Oct 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 9-20-0 Page 203
3. Prepare to Taxi
A. The airline taxi checklist should be used for preparing and taxiing the airplane.
B. Preparation for taxiing should include, but not necessarily be limited to, the following actions.
(1)
Perform an exterior inspection of the airplane:
(a)
Ensure that wheel chocks are in place.
(b)
Ensure that all cowling, doors, and hatches are secure.
(c)
Ensure that engine inlets and exhausts are clear.
(d)
Ensure proper clearance of flight control surfaces from all ground equipment and other obstructions.
(e)
Check tires for acceptable condition.
(f)
Check for a minimum of 2 inches shock strut clearance (i.e., amount of inner cylinder chrome surfaces exposed) on main landing gear.
CAUTION: DO NOT TAXI AIRPLANE WITH ANY SHOCK STRUT FULLY COMPRESSED. DAMAGE TO SHOCK STRUT COULD OCCUR.
(g)
Check that exposed surface of nose gear cylinder chrome does not exceed 10 inches.
CAUTION: DO NOT EXCEED MAXIMUM ALLOWABLE NOSE GEAR SHOCK STRUT EXTENSION OF 10 INCHES. EXTENSION GREATER THAN 10 INCHES COULD RESULT IN CENTERING CAM ENGAGEMENT WHICH COULD CAUSE PROBABLE DAMAGE DURING A TURN. AFT CENTER OF GRAVITY LIMITS MAY ALSO BE EXCEEDED, RESULTING IN TAIL TIPPING.
(h)
Check that nose gear torsion lines are connected.
(2)
Adjust cockpit seats to provide proper view from flight deck windows and to permit proper access to and proper operation of rudder and brake pedals.
(3)
Ensure that airplane systems are configured so as to permit electrical power to be safely applied. Apply electrical power for operation of the systems required for engine start-up and taxiing.
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