(3)  
If you cannot operate the cargo doors, you must go into the cargo area with a different procedure. You can cut through the airplane structure. Make sure that you have good structural data before you do this. This should only be done as the last option. This will cause extensive damage and repair to the airplane structure.

C.  
When You Lift the Airplane:

(1)  
Use good equipment with the necessary strength. You must have a minimum safety factor of five to lift the airplane from a point above the airplane.

WARNING: FOR COMBI OR PACKAGE FREIGHTER AIRPLANES, DO NOT CHANGE THE POSITION OF THE MAIN CARGO DOOR. IF THE DOOR IS CLOSED, MAKE SURE THAT YOU LATCH IT. THE DOOR MUST STAY LATCHED WHILE YOU LIFT THE AIRPLANE ON JACKS. IF THE DOOR IS OPEN, IT MUST STAY OPEN WHILE YOU LIFT THE AIRPLANE ON JACKS. DO NOT OPERATE THE DOOR WHILE THE AIRPLANE IS ON JACKS.
(2)  
Pneumatic bags are not always stable in the lateral direction. Sometimes you must use jacks and pneumatic bags together. Lift the airplane in small steps. This is a better procedure than if you use only the pneumatic bags.

(3)  
You should use tethers with the pneumatic bags. You must keep the tether lines tight and you must quickly make the lines loose when it is necessary. You must prevent structural damage (overstress) to the airplane at the tether points.

(4)  
Do not lift the airplane on jacks or with pneumatic bags in high winds (see SUBJECT 3-10-1 for wind velocity limitations).

(5)  
You must keep the airplane at a level attitude while you lift it. This keeps the airplane center of gravity in a safe range. If the center of gravity moves from a safe range, there can be lateral loads on the airplane. The lateral loads can move the airplane off the pneumatic bags or the jacks.

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PRECAUTIONS
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(6)  
The lift of the airplane can be a dangerous procedure. If the equipment is used for more than its strength, parts can break from their tether points. The failure of equipment because of a break can be dangerous to persons, the airplane and other equipment.

(7)  
Make sure a person monitors the load at each tether point. Then you can decrease a load before it becomes dangerous.

(8)  
Use a tail jack only to make the airplane stable. If the airplane is in a nose down position, lift the nose point first. Lift the nose point until you have a level airplane. Make sure that you decrease the height of the tail jack correctly while you change the attitude of the airplane.

D.  
When You Tow or Winch the Airplane:

WARNING: FOR COMBI AND PACKAGE FREIGHTER AIRPLANES, DO NOT TOW THE AIRPLANE WHILE THE MAIN CARGO DOOR IS OPEN. THE DOOR MUST BE CLOSED AND LATCHED WHILE YOU TOW THE AIRPLANE.
(1)  
Do not use higher loads than those in Figure 4-16 and Figure 4-17.
　
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