6.
The areas for the bag locations must be clear of all sharp objects. Remove all sharp objects (jagged edges or sharp protuberances) from the incident area. Prevent damage to the air bags. Put a layer of wood (1 inch or 25 mm thick plywood) below the air bags. Put a cover (tarpaulin) on top of the air bags.
7.
The airplane areas for the bags have special load limits (allowable surface bearing loads). The maximum loads for each area are shown in Figure 3-49. The top two bags in a location must not have pressures that are more than the maximum for that area. The lower bags in a location must have the pressures recommended by the manufacturer for the best stable condition.
CAUTION: DO NOT LIFT THE AIRPLANE IN HIGH WINDS (MORE THAN 23 MPH, 20 KNOTS OR 37 KM/HOUR). IF THE TERRAIN IS SOFT (OR MARSHY), USE AVAILABLE MATERIALS TO MAKE THE SURFACE SATISFACTORY. MAKE SURE THAT THE BAGS ARE SAFE FROM SHARP OBJECTS ON THE GROUND OR ON THE AIRPLANE. WHEN YOU INFLATE THE BAGS, MAKE SURE THAT THE VALVES DO NOT CAUSE DAMAGE TO AN ADJACENT BAG.
8.
Before you inflate the bags, examine the procedures and the safety precautions. Make sure that all the necessary equipment (jacks, cribs) is prepared and available. A level airplane attitude must be your primary task. You must get a level attitude and you must keep it while you lift the airplane. Use tools (plumb bobs and carpenter’s levels) to help you keep a level attitude. Keep the tether lines tight while you lift the airplane.
9.
Put each console in a position where the console person can clearly see and hear the control person (the person who controls all the procedures). This is very important while you lift the airplane. Prepare (flush) the console with air from the compressor.
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10.
When the protection pads are in their positions, inflate the lowest bag element. Inflate this element until you make a connection between the bags and the airplane. Inflate the second bag element from the top to tighten the connection (contour line). In this second bag element, start with the compartment that is nearest to the connection. Inflate all compartments of this bag element. Make sure that you make no deformations (folds or creases) while you inflate the bags.
11.
Adjust the air bag supports (cribs) to permit the bags to follow the shape of the lower wing and body surfaces. It can be necessary to use jacks on the supports (cribs) to adjust them to the movement of the airplane.
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757
AIRPLANE RECOVERY DOCUMENT
Figure 3-47 25 TON (23 METRIC TON) HIGH STABILITY PNEUMATIC LIFTING BAG AND ITS LIFTING
CAPACITY
25 TON (22.7 M TON) PNEUMATIC BAG LIFT CAPACITY IN POUNDS (KILOGRAMS)
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