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757
MAINTENANCE MANUAL
C. Communications
(1)
Most of the area around the airplane is out of the field of view permitted by the flight compartment windows. Also, much of the ground operations work near the airplane is out of the field of view of the flight compartment crew.
(2)
There must be communication between airplane and ground crews. This is necessary during the engine start, removal and replacement of wheel chocks, and during the engine shutdown.
(3)
You must use hand signals, lights, intercom and/or radio communications. These are important to have a safe taxi operation.
(4)
The communications with the ground control authority is also necessary for taxi operations. This will make sure that the persons in the tower know of the taxi operation, and the path that the airplane will follow.
D. Procedure to Taxi the Airplane
(1)
When you taxi the airplane on the ground, the movement is equivalent to other conventional tricycle geared airplanes.
(a) The nose wheel steering, and the engine thrust are used as necessary, to taxi the airplane.
(2)
Airplane ground stability.
(a)
757-200 AIRPLANES; During the airplane taxi, the center of gravity (CG) must always be below the Ground Stability Limits line (shown in 09-11-00, Figure 202).
(b)
Find the airplane center of gravity (CG) for the applicable airplane configuration. Use component weight and CG data, and the procedures to calculate them, in the approved weight and balance manuals.
(3)
Airplane clearance during the taxi.
(a) Make sure you have the necessary clearance when you go near a parked airplane or other structures. 1) When the APU in the taxi airplane or the parked airplane is
on, you must have a minimum clearance of 32.8 feet (10 meters). a) The clearance must be between the APU exhaust port and
the adjacent airplane's wingtip (fuel vent).
(4)
Airplane taxi speed.
(a)
The taxi speed must not be more than approximately 20 knots. Speeds more than this, added to long taxi distances will cause heat to collect in the tires.
(b)
Before you make a turn, decrease the speed of the airplane to a speed which is applicable to the local conditions. On a dry surface, use a speed of approximately 8 to 12 knots.
(5)
Airplane turns during taxi.
(a)
Always use the largest turn radius possible.
(b)
Do not try to turn the airplane until it has moved.
(c)
Make all turns at a slow taxi speed to prevent tire skids.
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NOTES:
. 5` TIRE SLIP ANGLE APPROXIMATE FOR 65` TURN ANGLE
THEORETICAL CENTER OF TURN FOR MINIMUM TURNING RADIUS. SLOW CONTINUOUS TURNING AT MINIMUM THRUST ON ALL ENGINES. NO DIFFERENTIAL BRAKING
FOR AN EFFECTIVE TURN ANGLE OF 60`
MODEL X Y A R-3 R-4 R-5 R-6
757-200 FT 60 35 120 71 98 87 95
M 18.3 10.7 36.6 21.6 29.9 26.5 29.0
Taxi Turning Radius
Figure 201
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(d)
When an outboard engine is used to help make a turn, use only the minimum power possible.
(e)
Do not let the airplane stop during a turn.
(f)
Do not use the brakes to help during a turn.
NOTE: See the paragraph on Airplane taxi in bad weather
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