(2)
Power plant operation limitations.
(3)
Normal power plant operation.
(4)
Motor the engine.
(5)
Cold weather power plant operation.
B.
Normal power plant operation is the routine or standard procedure for the engine operation.
C.
Engine motoring operation is the procedure to turn the engine with the starter without ignition.
(1)
Dry motoring is done with no fuel supplied to the engine.
(2)
Wet motoring is done with fuel supplied to the engine.
D.
Cold weather power plant operation is the procedure to operate the engine during conditions of snow, ice and freezing temperatures.
TASK 71-00-00-842-001-C00
2. Prevent Airplane Movement During Engine Operation At High Power
_______________________________________________________________
A. General
(1)
For maintenance, engine operation at high power can be necessary.
(a)
One engine can be operated at idle power to a limited power setting, and the other engine can be operated at TAKEOFF power or,
(b)
The two engines can be operated at the same power setting.
(c)
One engine can be operated with the second engine stopped.
(2)
With the parking brakes on and wheel chocks installed at the nose and main landing gear wheels, engine operation at high thrust can move the airplane.
(a)
The airplane will go over (jump) the wheel chocks, and
(b)
The airplane will move in a skid until the thrust is decreased.
NOTE: A skid is a sideways or forward movement on the ground
____ with the wheels stopped, and is not controlled.
(3) To make sure the airplane will not skid, the parking brake must be ON, the airplane gross weight and center of gravity (CG) must be in the necessary limits, the ramp surface must be free of contamination, and the recommended power setting for the second engine (with the first engine at takeoff power) must be correct.
(a) The decision to operate the second engine at takeoff power with the operation of the first engine at take off power is given to the operators.
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ALL ú ú C01 Page 201 ú Mar 12/00
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(b)
The wheel chocks will only prevent the movement of an unpowered airplane if the parking brake is released.
(4)
There are three types of tables:
(a)
The minimum gross weight required for the operation of two engines at the same power setting; takeoff power or part power.
(b)
The minimum gross weight required for the operation of one
engine at all power settings with the other engine stopped.
(c)
The minimum gross weight for the operation of the first engine at takeoff power and the second engine at a limited N1 setting, dependant on the ambient temperature.
(5)
Some of the tables that follow will give the recommended power setting for the second engine (with the first engine at takeoff power), for the airplane gross weight, the ambient temperature and the center of gravity location.
(a)
The airplane gross weight is the sum of the empty weight of the airplane and the weight of the fuel and the crew to do the engine run. 1) The total empty weight of the airplane is the sum of the
manufacturer's empty weight, and the weight of safety and miscellaneous equipment, consumables, fuel not used, toilet fluid and chemicals, oil, oxygen, and potable water.
(b)
Knowledge of the center of gravity location of the airplane
permits you to do the engine run at low gross weights.
NOTE: If you do not know the center of gravity of the
____ airplane, use the table with the title " CG Not Known".
1) The tables that follow give the taxi center of gravity (CG) range and CGs that are not known. a) Refer to AMM 09-20-00/201 for the ground stability
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