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A
747-400
MAINTENANCE MANUAL
ICY WET DRY
1 1 1
100
80
WIND VELOCITY KNOTS
60
CG-8.5% MAC
40
CG-33% MAC
20
0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
TIRE-TO-GROUND FRICTION COEFFICIENT,
A. FLAPS UP, STAB = 3 PILOT UNITS (HORIZONTAL)
B. WIND FROM ANY DIRECTION
C. WIND GUST SHALL BE ADDED TO STEADY WIND VELOCITY FOR MAXIMUM WIND SPEED
D. USE ACTUAL AIRPLANE WEIGHT, CG POSITION, AND TIRE-TO-GROUND FRICTION CO-EFFICIENT FOR INTERPOLATION
E. IF NO MEASURED VALUE FOR TIRE-TO-GROUND FRICTION COEFFICIENT IS AVAILABLE, USE THE LOWER LIMIT OF THE APPROPRIATE BOUNDED FRICTION BAND
F. FOR TOWING AND MANEUVERING IN CLOSE PROXIMITY TO BUILDINGS OR OTHER AIRPLANES, THE ALLOWABLE WIND VELOCITY SHOULD BE REDUCED BY ONE THIRD
G. REDUCE WIND SPEED LIMITS TO ACCOUNT FOR OPERATIONAL CONSIDERATIONS SUCH AS HIGH SPEED TOWING OR CONTAMINATED TIRES OR RUNWAYS
H. BASED ON ZERO PERCENT GROUND SLOPE.
APPROXIMATE NORMAL RANGES SHOWN
Wind Velocity During Towing
Figure 212
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A
747-400 MAINTENANCE MANUAL
S 092-076
(4) If you have used a tow bar, remove the tow bar from the nose gear tow lug and do the steps that follow:
(a)
Lower the tow bar wheels.
(b)
Lift the tow bar locking mechanism handle.
(c)
Pull the tow bar straight out from the tow lug.
(d)
Lower the tow bar locking handle.
(e)
Remove the tow bar and tow vehicle.
S 282-077
WARNING: WHEN YOU REMOVE THE NOSE WHEEL LOCKOUT PIN, THE NOSE WHEELS CAN
_______ QUICKLY CENTER. INJURY TO PERSONS CAN OCCUR.
(5)
Make sure that the nose wheels center.
S 092-065
(6)
Remove the nose gear Tow Pin (Fig. 201).
S 092-066
CAUTION: MAKE SURE THAT THE FOUR WING AND BODY GEAR GROUND LOCKPINS,
_______ NOSE GEAR GROUND LOCKPIN, AND THE NOSE GEAR STEERING LOCKPIN ARE ALL REMOVED FROM THE AIRPLANE BEFORE YOU RELEASE THE AIRPLANE FOR FLIGHT.
(7) Remove all of the landing gear ground lockpins.
NOTE: It is optional to install landing gear lockpins when you tow
____ or push the airplane for a flight. This is when the airplane is in position for the flight crew to taxi the airplane prior to or after a flight.
S 092-082
WARNING:_______REFER TO 32-00-30/201 FOR THE DOOR LOCK REMOVAL PROCEDURE. THE DOORS CAN MOVE QUICKLY AND CAUSE DAMAGE TO EQUIPMENT OR INJURY TO PERSONS.
(8) Remove the wing, body, and nose gear door locks, if it is necessary (Fig. 201).
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A
747-400 MAINTENANCE MANUAL
TAXIING - MAINTENANCE PRACTICES
_______________________________
1. General
_______
A. This procedure contains one task. The task is to taxi the airplane.
TASK 09-21-00-582-001
2. Airplane Taxi
_____________
A. General
(1)
Taxi Safety
(a)
When you taxi an airplane, caution and precision are necessary. The taxi procedure must be done only by persons that are approved.
(b)
The taxi path must be clear of all persons and vehicles.
(c)
You must get approval from the airport ground control to taxi the airplane. This will prevent interference with other airport operations.
(d)
You must keep clearance from structures and other airplanes, at all times.
(e)
You must have electrical power to operate these systems to taxi the airplane safely: 1) The taxi lights 2) The navigation lights 3) The radio and intercom equipment 4) All other systems that are necessary
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