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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
NOTE:____ UNUSUAL BREAKAWAY CONDITIONS NOT SHOWN. STRAIGHT LINE TOW SHOWN.COEFFICIENTS OF FRICTION (.) ARE SHOWN FOR RUBBER-TIRED TOW VEHICLES.(FOR ALLOWABLE TOWING LOADS, SEE FIG 203)100 875
9075070080625
U23267
DRAWBAR PULL (1000 LBS)
AIRPLANE GROSS WEIGHT (1000 LBS)
60375
50
250
40
30
20
10
0 0 20 40 60 80 100 120 140 160 180 200 220 0 10200 1 2 3 4
TOTAL TRACTION WHEEL LOAD (1000 LBS)
AIRPLANE GROSS WEIGHT 700,000 POUNDSTOWING ON SNOW WITH CHAINS INSTALLEDON TRACTOR AGAINST A 2% SLOPE WITH ANADDED RESISTANCE OF 10,000 POUNDSFROM IDLE THRUST OF ENGINES (WHENBACKING AIRPLANE). THE RESULT IS ADRAWBAR PULL OF 52,000 POUNDS ANDTRACTOR WEIGHT OF 118,000 POUNDS,OR LARGER.
EXAMPLE:
TOTALPERCENTRESISTANCESLOPE (%) FROM ENGINEIDLE THRUSTWHEN BACKINGAIRPLANE(1000 LBS)
Breakaway Towbar Load Requirements
Figure 205
A
747-400 MAINTENANCE MANUAL
70
NOSE GEAR STEERING ANGLE - DEGREES
60
50
40
30
20
10
0
(METERS)
TURNING RADIUS
Turning Radius of Towed Airplane with Body Gear Steering Active or Inactive
Figure 206
U20801
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
NOSE GEAR TOWING ANGLE ò RADIUS TURN X CLEARANCE RADIUS 180` TURN MINIMUM WIDTH FOR Z 2
WING A TIP GEAR NOSE B 2 GEAR WING C 2 D TAIL TIP E NOSE
FT M FT M FT M FT M FT M FT M FT M
30` 137 42 244 75 160 49 158 48 214 65 173 53 318 97
40` 94 29 206 63 125 38 115 35 180 55 141 43 240 73
50` 66 20 181 55 105 32 87 27 161 49 124 38 192 59
60` 46 14 165 50 94 29 67 20 150 46 115 35 161 49
165` 35 11 158 48 90 28 55 17 146 45 112 34 148 45
70` 29 9 150 46 87 26 50 15 141 43 109 33 136 41
MAXIMUM ALLOWABLE TOWING ANGLE WITH TORSION LINKS CONNECTED IS 65 DEGREES. TO OUTSIDE OF TIRE
NOTE: ABOVE VALUES ARE CALCULATED AND DO NOT ACCOUNT FOR TIRE SCRUB OR SLIP. ABOVE VALUES INCLUDE BODY GEAR STEERING.
Turning Clearance
Figure 207
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A
PUSHBACK CAUTION ZONE
PUSHBACK HAZARD ZONE
TOW VEHICLE
747-400
MAINTENANCE MANUAL
PUSHBACK
PUSHBACK
HAZARD ZONE
CAUTION ZONE
_______ MAINTAIN A MINIMUM OF TEN FEET (3 METERS) SEPARATION BETWEEN PERSONS ON THE GROUND, AND THE
WARNING: NOSE WHEELS, THE TOW BAR AND TOW VEHICLE, AND THE MAIN WHEELS WHILE THE AIRPLANE IS MOVING.
Towing Hazard Zones
Figure 207A
D13372
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