WARNING: BE CAREFUL WHEN YOU CALCULATE THE CENTER OF GRAVITY OF THE AIRPLANE. USE THE MANUAL (WEIGHT AND BALANCE MANUAL) TO FIND THE CENTER OF GRAVITY AND THE WEIGHT. MAKE A MARK ON EACH SIDE OF THE FUSELAGE FOR THE LOCATION OF THE CENTER OF GRAVITY.
3.
Find the location of the airplane center of gravity. If you remove all the fuel and all the payload from the airplane, you have a usual condition (OEW and CG location). There are usually no problems.
If some fuel or some payload stays on the airplane, you have a condition that is not usual. You must calculate the NRW (Net Recoverable Weight) and the location of the CG (Refer to SECTION 2-30). You must also calculate these values if a large airplane part is destroyed or severed from the airplane. If the NRW is large and the CG makes a large movement (forward or aft), you must calculate other forces. These forces occur on the jack points, fuselage skin or other airplane points while you lift the airplane.
4.
Remove all the fuel and all the payload. This decreases the airplane weight to a minimum value.
5.
Install all tethers before you lift the airplane (Refer to SECTION 3-20).
6.
If you lock the gear in the closed (folded oleo) position, you must decrease the air pressure in the landing gear struts.
3-30-2
WHEN YOU PREPARE TO LIFT THE AIRPLANE
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3-30-3 When You Lift the Airplane from Various Positions
1. The airplane can have many attitudes or different types of these attitudes at the time of the recovery. These are some of the attitudes:
A. You have a folded nose gear.
B. You have folded main gears.
C. You have a folded main gear on one side of the airplane.
D. You have a folded nose gear and a folded main gear on one side of the airplane.
E. You have all folded gears.
F. You have no folded gears. The airplane is in the usual attitude but it is off the runway (in mud, water, or other material). You must lift the airplane before you can tow it.
2. If you have a folded gear, you must lift the part of the airplane near the gear. This permits you to do these tasks:
A. You can open (extend) the gear if it is not damaged.
B. You can repair or replace the gear if parts are available. You can also use a support system (dummy gear) as a temporary repair.
C. You can move a truck (flat bed) or dolly below the gear area to permit movement of the airplane. This can occur when there is no possible repair or replacement. This can also occur when there is no support system available.
3. When You Lift the Airplane with a Folded Nose Gear
(See Figure 3-19 or Figure 3-24)
A. The fastest procedure uses a movable crane and a sling to lift and hold the forward fuselage. 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：757 Airplane Recovery Document 飛機恢復文件(70)
