6. Return Airplane to Normal
A. Attach static ground wires.
B. Disconnect and stow intercommunication set.
C. If operating, shut down APU.
D. If landing gear downlock pins were installed, remove them prior to taxi and takeoff.
7. Center of Gravity Calculations for Towing
A. During all phases of ground handling and maintenance, the center of gravity (CG) of the airplane must be forward of the aft CG limit (Fig. 201). This CG limit provides a margin of safety to allow for grade, winds, and acceleration forces as noted. The configuration to be towed should be carefully checked to ensure that the CG is forward of the towing limit. If the aft towing limit is exceeded, the recommended procedure is to move the CG forward by adding ballast or fuel. The table in Fig. 201 gives the incremental CG shift for some of the items to be considered. A forward CG shift is (-) and an aft CG shift is (+). All data is for a level airplane.
5B3
Feb 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 9-10-0 Page 203
G53210
Towing Center of Gravity Limitations 510
9-10-0 Figure 201 Feb 20/89
Page 204
5A8 Towing Loads and Turning Radius
May 01/98 Figure 202 9-10-0
Page 205
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
NOTE: ALL WING TIP RADII (D) ARE FOR THEORETICAL TURNS. NO CONSIDERATION IS GIVEN FOR TIRE SCUFFING ON A TURN, FRICTION FACTORS, ETC. ACTUAL RADII (D) WILL BE SLIGHTLY LARGER THAN THEORETICAL NUMBERS.
NOTE: EFFECTIVE TAXI STEERING ANGLE EQUALS NOSE GEAR ANGLE MINUS NOSE GEAR SLIPPAGE ANGLE. EFFECTIVE TOWING ANGLE EQUALS NOSE GEAR ANGLE.
Wing Tip Clearance Radius 502
9-10-0 Figure 203 Nov 15/77
Page 206
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
525 Ground Turning Techniques
Nov 15/77 Figure 204 9-10-0
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8. Tow Airplane in High Wind
A. The airplane may be towed in high winds provided conditions are observed per Fig. 205.
500
9-10-0 Page 208 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/90
500 Wind Velocity During Towing
Oct 20/90 Figure 205 9-10-0
Page 209
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
10. Towing Airplane (Pushback)
A. Make sure the person that works near the area knows the pushback hazard zone as shown in Fig. 206.
(a)
Tow vehicle
(b)
Tow bar
(c)
Nose wheels
(d)
Main wheels
WARNING: WHEN YOU TOW THE AIRPLANE, ALL PERSONS MUST STAY OUT OF THE DANGEROUS AREAS AROUND THE TOW VEHICLE, TOW BAR, NOSE WHEELS, AND MAIN WHEELS. PERSONS ON THE GROUND MUST KNOW IT IS POSSIBLE TO BE RUN OVER BY THE NOSE WHEELS, MAIN WHEELS AND THE TOW VEHICLE. THIS IS BECAUSE THE AIRPLANE WILL CHANGE POSITION DURING PUSHBACK AND TOWING. MAKE SURE YOU KEEP A MINIMUM OF 10 FEET SEPARATION BETWEEN PERSONS ON THE GROUND AND THE EQUIPMENT THAT MOVES. IF YOU DO NOT KEEP THE MINIMUM DISTANCE, A FATAL INJURY COULD OCCUR.
502
9-10-0 Page 210 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 01/95
E79647
502 Towing Hazard Zones
Feb 01/95 Figure 206 9-10-0
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TOWING AIRPLANE WITH FLAT TIRES
1. General
A. The airplane can be towed by the nose gear if there is no more than one flat tire per gear. Towing with flat tires should be done slowly and sharp turns avoided to minimize damage to the flat tire or wheel rim (Ref 9-10-0).
B. If there is more than one flat tire per gear, either replace the flat tires, as required, with serviceable tires so there is only one flat tire per gear, or tow the airplane with cables attached to each main gear.
CAUTION: THE BREAKAWAY LOAD MAY EXCEED NOSE GEAR TOWING LOAD CAPABILITY WITH MORE THAN ONE FLAT TIRE PER GEAR.
2. Equipment and Materials
A. Eyebolt Assembly - Main Gear Towing - F72719
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