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 limits for the taxi CG range. 2) The tables use the center of gravity (CG) location of the airplane in % Mean Aerodynamic Chord (%MAC).
 NOTE: The CG location in the %MAC form is also calculated
____ for operational flight considerations to make sure the airplane is not flown outside the CG limit, and to set the horizontal stabilizer trim for takeoff.
 a) The method for the calculation of the CG location in %MAC is given in the Weight and Balance Manual.
 NOTE: The calculation of the %MAC is difficult.
____ Your airline engineer has the Weight and Balance Manual.
 3)  The CG location of the airplane affects the proportion of the airplane weight on the landing gear of the airplane, which affects the friction between the tires and the ramp. a) The maximum weight on the main landing gear and the
 minimum weight on the nose gear occurs at an aft CG.
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b)  The minimum weight on the main landing gear and the maximum weight on the nose gear occurs at a forward CG.
 c)  As the weight on the landing gear increases, the friction increases, which decreases the possibility of skidding.
 (6)  
When you operate only one engine at high power, make sure that a
 pneumatic source is available to motor the engine if there is a
 compressor surge (stall) or a fire in the gaspath.

 (a)  
Operate the other engine at a minimum of 22%N1; or

 (b)  
Operate the APU.

 

 B.  
Procedure

 S 862-002-C00
 (1)  Make sure you follow these instructions in the Power Plant Operation procedure to prepare the airplane:
 (a)  
Make sure the ramp area, the nose gear tires and the main gear tires are clean and free from contamination and possible FOD (Foreign Object Damage).

 NOTE:____A damp ramp surface is permitted. Water, frost, ice, oil, grease, sand or other contaminants are not permitted.

 (b)  
You must set the parking brake.

 1)  Make sure the red warning light for the parking brake is ON.

 (c)  
Make sure the ANTISKID switch, on the center instrument panel P2, is in the OFF position.

 (d)  
Make sure the nose gear is in the straight forward direction.

 (e)  
Make sure the ground locks are installed on the nose gear and the main landing gear.

 (f)  
Put the wheel chocks 6 to 12 inches (15 to 30 cm) in front and aft of the nose gear tires and all the main gear tires.

 S 862-003-C00
 (2)  Find the airplane gross weight.
 (a)  
The airplane gross weight is the sum of the total empty weight of the airplane with the fuel load necessary to do the engine run, the weight of the crew, and if necessary, a load in the aft cargo compartment. 1) The fuel burnoff during the test must be subtracted from

 the airplane fuel load and credited as ballast. 2) You must subtract the weight of equipment that is removed from the airplane (i.e., seats, interior panels, galleys). 3) The airplane must have a minimum fuel load or other loads in the usual CG range of the airplane. 4) It is not always possible to use the fuel load to increase the gross weight because of operational considerations. 5) It may be necessary to unload the fuel after the engine run.

 (b)  
Make a record of the airplane gross weight.

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S 862-004-C00
 (3)  
If the first engine is set to takeoff (T/O) power and the second engine is set at limited power, do these steps:

 (a)  
Find the ambient temperature.

 (b)  
　
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