757
MAINTENANCE MANUAL
A 757-200 36,200 LBS (16,420 KGS)
B 33,000 LBS (14,970 KGS)
C 24,560 LBS (11,140 KGS)
NOTE: DISCONNECT NOSE GEAR TORSION LINK WHEN TOWING AT ANGLES GREATER THAN 65` TO PREVENT DAMAGE TO THE HYDRAULIC STEERING SYSTEM
Nose and Main Gear Maximum Towing Loads Figure 203
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MAINTENANCE MANUAL
CAUTION:_______ DO NOT TOW THE 757-200 AIRPLANE AT ANGLES THAT ARE MORE
THAN 65 DEGREES. THIS IS WHEN THE TORSION LINKS FOR THE
NOSE GEAR ARE NOT DISCONNECTED. IF YOU TOW DURING THESE
CONDITIONS, DAMAGE TO THE AIRPLANE HYDRAULIC SYSTEM CAN
OCCUR.
DO NOT DISCONNECT THE 757-200 NOSE WHEEL STEERING SPRING
CARTRIDGE FROM THE UPPER TORSION LINK WHEN YOU DISCONNECT
THE TORSION LINKS (AMM 32-21-09). ATTACH THE UPPER
TORSION LINK SO THE SENSOR TARGETS (THAT ARE INSTALLED ON
THE UPPER TORSION LINK) DO NOT HIT THE SENSORS DURING THE
TOW. ATTACH THE LOWER TORSION LINK AS NECESSARY TO
PREVENT DAMAGE DURING THE TOW.
(a) 757-200 AIRPLANES; When the nose gear angle will be more than 65 degrees, disconnect the torsion links (Figure 207) before you tow the airplane (AMM 32-21-09).
NOTE: A red indicator stripe is painted on the nose gear
____ doors. This stripe will tell you when you are near a 65 degree nose gear turn.
AFT TOW FITTING
1
FORWARD TOW FITTING
1
IF INSTALLED
Nose Gear Tow Fittings
Figure 204
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MAINTENANCE MANUAL
NOTES: . .
757-200
Turning Radii - No Slip Angle
Figure 205
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MAINTENANCE MANUAL
WET ASPHALT .=0.75 WET CONCRETE .=0.57
DRY CONCRETE OR ASPHALT .=0.8
SNOW/CHAINS .=0.45
40
AIRPLANE GROSS WEIGHT 30
(X 1,000 LB)
300
250 221 (EXAMPLE)
20 200
DRAWBAR PULL (X 1,000 LB)
150 100
10
0
TOTAL TRACTION WHEEL LOAD (X 1,000 LB) OPERATING. NUMBER OF ENGINES IDLE THRUST. BACKING AGAINST PERCENT SLOPE
(EXAMPLE)
MODEL 757 WITH A MAXIMUM TAXI WEIGHT OF 221,000 POUNDS (100,244 KILOGRAMS) AND TWO ENGINES IDLING. WHEN THE PAVEMENT IS ASSUMED TO BE WET CONCRETE WITH A 2 PERCENT SLOPE, THE REQUIRED TOTAL TRACTION WHEEL LOAD WOULD BE 30,000 POUNDS (13,600 kg) AND THE DRAWBAR PULL WOULD BE 17,000 POUNDS (7,711kg) (EXAMPLE A). WHEN THE AIRPLANE IS BACKED WITHOUT IDLE THRUST, THESE NUMBERS WOULD CHANGE TO 23,300 POUNDS (10,600kg) AND 13,300 POUNDS (6,032kg), RESPECTIVELY (EXAMPLE B)
NOTES:
. STRAIGHT LINE TOW . UNUSUAL BREAKAWAY CONDITIONS NOT SHOWN . COEFFICIENTS OF FRICTION (.) ARE ESTIMATED
FOR RUBBER TIRED TOW VEHICLES
Breakaway Tow Bar Load Requirements
Figure 206
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