(c)
Examine the cargo for lateral balance.
1) If the airplane remains in a list or lateral unbalance condition, calculate the weight and balance. Use the Weight and Balance Control and Loading Manual (D043U400). Make sure the lateral balance limits are not exceeded.
S 212-088
(6) If you will use a tow bar do the steps that follow:
(a)
Examine the tow bar shear bolts for fractures.
(b)
If there is a fracture in the tow bar shear bolts, replace the bolts.
NOTE: Four spare shear bolts are kept on the tow bar.
____ When you replace the shear bolts, use AN9-57A bolts and NAS1022C9 nuts. Tighten the nuts 50 to 100 pound-inches.
S 862-005
(7)
Move the cargo to give lateral balance, if it is necessary.
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(8)
Move the fuel to give lateral balance, if it is necessary (Ref 28-26-00-201).
S 862-093
CAUTION: DO NOT TOW THE AIRPLANE WITH A FULLY COMPRESSED SHOCK STRUT.
_______ DAMAGE TO THE SHOCK STRUT CAN OCCUR.
(9) Make sure that the shock struts are serviceable (Ref 12-15-03/301, 12-15-04/301, 12-15-05/301).
NOTE: The check for a minimum shock strut extension is a "quick
____ check" for towing the airplane during maintenance. The landing gear must be filled as shown on the servicing chart for flight dispatch.
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747-400 MAINTENANCE MANUAL
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CAUTION:_______ THE MAXIMUM PERMITTED SHOCK STRUT EXTENSION FOR THE NOSE
LANDING GEAR IS 18 INCHES. THIS IS TO MAKE SURE THE CENTERING
CAM DOES NOT ENGAGE.
(10) Make sure the open surface of the inner cylinder chrome, of the nose landing gear, is not more than 18 inches.
S 492-005
WARNING: WHEN YOU WILL USE A TOW BAR TO MOVE THE AIRPLANE IN HIGH WINDS,
_______ CONNECT THE TOW BAR BEFORE YOU INSERT THE STEERING LOCKOUT PIN (TOW PIN). THE AIRPLANE COULD MOVE AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
CAUTION: DO NOT SET THE SUMMING LEVER WITH THE HYDRAULIC SYSTEM
_______ ACTIVATED. THE WHEELS WILL TURN WHICH CAN CAUSE DAMAGE TO EQUIPMENT.
(11) Install the Steering Lockout Pin (Fig. 201).
NOTE: When you insert the Steering Lockout Pin the nose gear hydraulic steering will lock out. With the Steering Lockout Pin installed the nose gear will turn as far as 65 degrees. To make a turn more than 65 degrees, you must disconnect the torsion links.
You can reach the summing lever through an access hole in the nose gear steering, metering valve. If it is necessary, you can insert the Steering Lockout Pin when you move the summing lever.
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MAINTENANCE MANUAL
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WARNING: MAKE SURE YOU INSTALL THE LANDING GEAR DOOR LOCKS BEFORE YOU
_______ INSTALL THE GEAR GROUND LOCK PINS, IF THE LANDING GEAR DOORS ARE OPEN (REF 32-00-30/201). AS AN ALTERNATIVE, MAKE SURE THE DOOR HANDLES ARE IN THE DOOR OPEN POSITION. TO PREVENT ACCIDENTAL OPERATION, REMOVE THE GEAR GROUND LOCKPIN INSTALLATION TOOL AFTER YOU INSTALL THE LOCKPIN. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(12) Make sure you install all gear ground lockpins (Fig. 201). Remove the nose gear ground lockpin installation tool, if it is necessary.
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 862-007
(13) Make sure you release the airplane brakes.
S 752-007
CAUTION: AT ALL TIMES, KEEP THE CENTER OF GRAVITY WITHIN THE LIMITS
_______ SHOWN (FIG. 202). UNUSUAL CONDITIONS, SUCH AS PERSONNEL GATHERED IN THE AFT FUSELAGE, FUEL IN THE OUTBOARD WING TANKS, REMOVAL OF MAJOR RADIO AND ELECTRONIC EQUIPMENT COMPONENTS FROM THE FORWARD BODY, ETC., CAN CAUSE A CHANGE IN THE AFT CENTER OF GRAVITY. IF THE CENTER OF GRAVITY MOVES TOO FAR AFT, THE AIRPLANE COULD FALL ON IT'S TAIL.
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本文链接地址：747-400 AMM 飞机维护手册 TOWING AND TAXIING(4)
