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(20) If you will exceed the maximum nose gear tow loads, use the Emergency Towing procedure (see par. 5) to tow the airplane.
NOTE:____Do not attach a tow bar to the airplane. Do not disconnect the nose gear torsion links. See the Emergency Towing procedure for more towing information.
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(21) If you will use a tow bar, do the steps that follow:
(a)
Align the tow bar in front of the nose gear towing lug.
(b)
Lift the handle of the tow bar lock mechanism.
CAUTION: MAKE SURE THE TOW BAR PINS ARE ALIGNED WITH THE TOW LUG
_______ HOLES. DO NOT USE FORCE TO MOVE THE TOW BAR PINS INTO THE TOW LUG HOLES. DAMAGE TO TOW BAR MECHANISM CAN OCCUR.
(c) Move the tow bar above the towing lug and lower the handle of the tow bar lock mechanism.
CAUTION: ON SOME AIRPLANES, WHEN YOU USE UNDER BODY TOWING, DAMAGE
_______ CAN OCCUR TO THE VHF ANTENNA. CLEARANCE BETWEEN THE TOW VEHICLE AND THE VHF ANTENNA WILL DEPEND ON THE VHF ANTENNA LOCATION, TOW BAR LENGTH, TOW VEHICLE HEIGHT, AIRPLANE WEIGHT, AND CG CONDITIONS. MAKE SURE SUFFICIENT CLEARANCE EXISTS BEFORE YOU USE UNDER BODY TOWING.
(d)
Move the tow vehicle to the tow bar and engage the tow bar.
(e)
Lift the tow bar wheels.
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CAUTION: IF YOU HAVE DISCONNECTED THE TORSION LINKS, MAKE SURE THE
_______ TORSION LINKS DO NOT DROP. DAMAGE TO THE SQUAT SWITCH MOUNTING BRACKET CAN OCCUR.
(22) If the nose gear angle may be more than 65 degrees, disconnect the torsion links before you start to tow the airplane (AMM 32-21-03/201).
NOTE: If you will use the body landing gear steering system
____ (par. 6), do not disconnect the torsion links and do not tow at an angle more than 70 degrees. The nose gear torsion links must stay connected while you tow the airplane. This will permit the body landing gear steering system to work when the nose gear is turned 20 degrees or more.
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MAINTENANCE MANUAL
MAXIMUM ALLOWABLE TOWING LOADS
FOR SUSTAINED TOWING
MAX TAXI GROSS WEIGHT
LOAD 873,000 LBS
A 131,000 LBS
B 65,500 LBS
C 46,200 LBS
D 97,800 LBS
TOW FORCE CALCULATION
BREAKAWAY ON DRY LEVEL CONCRETE: 4% X W TO MAINTAIN ROLLING ON LEVEL SURFACE: 3% X W BREAKAWAY ON SLOPE: 4% X W + 1% X W PER 1% SLOPE TO MAINTAIN ROLLING ON SLOPE: 3% X W + 1% X W PER 1% SLOPE EXAMPLE: BREAKAWAY ON 2% SLOPE FOR 873,000 POUND AIRPLANE (NO ENGINE
OPERATING) 4% X 873,000 + 2% X 873,000 = 52,380 LB PULL
Nose and Main Landing Gear Maximum Towing Loads
Figure 203
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MAINTENANCE MANUAL
TORSION LINK HOLDING TOOL
(IN SECURED POSITION) UPPER TORSION LINK
TOW VEHICLE (IN SECURED POSITION) LOWER TORSION LINK TORSION LINK BOLT PIN VEHICLE TOW STEERING STREAMER LOCKOUT PIN WIRE SUPPORT STRAIN GAGE TOW LUG NOSE GEAR
TOW BAR WHEELS SHEAR BOLT (2 PLACES) TOW BAR MECHANISM HANDLE TOW BAR LOCK
____NOTE: WHEEL REMOVED FOR CLARITY.
Tow Bar Attachment
Figure 204
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本文链接地址：747-400 AMM 飞机维护手册 TOWING AND TAXIING(7)
