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MAINTENANCE MANUAL
WARNING: WHEN YOU TOW THE AIRPLANE, ALL PERSONS MUST STAY OUT OF
_______ THE DANGEROUS AREAS AROUND THE TOW VEHICLE, TOW BAR, NOSE WHEELS, AND THE MAIN WHEELS. PERSONS ON THE GROUND MUST KNOW IT IS POSSIBLE TO BE RUN OVER BY THE NOSE WHEELS, MAIN WHEELS, AND THE TOW VEHICLE. THIS IS BECAUSE THE AIRPLANE WILL CHANGE POSITION DURING PUSHBACK AND TOWING. MAKE SURE YOU KEEP A MINIMUM OF 10 FEET SEPARATION BETWEEN PERSONS ON THE GROUND AND THE EQUIPMENT THAT MOVES. IF YOU DO NOT KEEP THE MINIMUN DISTANCE, A FATAL INJURY CAN OCCUR.
(a)
Make sure the persons that work near the areas that follow, know the pushback hazard zones as shown in Figure 207A:
-
tow vehicle
-
tow bar
-nose wheels
-main wheels.
(b)
Before you park the airplane, complete towing with a 12-foot straight path.
NOTE: This will release torsional stress applied to the
____ landing gear components and tires during a turn.
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.
(c) If the torsion links were disconnected, align the links during the last few feet of the tow so that the torsion link bolt can be installed.
NOTE: To make the final adjustment of the torsion links,
____ move the tow bar sideways (if installed).
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(7)
Close the 6L18 PARK BRAKE circuit breaker on the P6 panel.
(8)
Set the parking brake.
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NOTE: If the Brake Temp display shows on EICAS, release the
____ parking brake after the wheel chocks are in location.
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(9) Make sure the HYD BRAKE PRESS gage shows approximately 3000 psi.
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747-400 MAINTENANCE MANUAL
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(10) Put the airplane to it's usual condition (see par. 12).
TASK 09-11-00-582-068
10. Tow the Airplane With Flat Tire(s)__________________________________
A. General
(1)
When you tow the airplane with a flat tire, you must obey the conditions specified on Fig. 211.
(2)
For airplane clearances during towing, see Fig. 207.
B. Procedure
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(1) Prepare to tow the airplane (see par. 2).
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WARNING: IF YOU LOSE HYDRAULIC POWER ON THE AIRPLANE WHILE YOU ARE
_______ TOWING THE AIRPLANE, YOU MUST TELL THE TOW VEHICLE OPERATOR. YOU MUST DECREASE THE TOW SPEED OR STOP TOWING, IF IT IS NECESSARY. IF YOU HAVE A DECREASE IN HYDRAULIC POWER, ONLY ACCUMULATOR PRESSURE WILL BE AVAILABLE FOR BRAKE OPERATION.
IF YOU HAVE A DECREASE IN HYDRAULIC POWER WHILE TOWING, DO NOT APPLY THE BRAKES EXCEPT IN AN EMERGENCY OR UNTIL THE AIRPLANE IS PARKED. SMALL PRESSURE ON THE PEDAL ENDS WILL CAUSE A LOSS OF HYDRAULIC BRAKE PRESSURE. A DECREASE IN HYDRAULIC PRESSURE WILL LIMIT THE ABILITY OF THE BRAKE SYSTEM TO STOP THE AIRPLANE.
CAUTION: DO NOT HOLD OR TURN THE NOSE WHEEL STEERING TILLER WHILE YOU
_______
TOW THE AIRPLANE.
(2) Tow the airplane.
NOTE: For airplane clearances during towing, see Fig. 207.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
TIRES). (MAXIMUM 18 FLAT MORE GEAR ASSEMBLIES TIRES). GEAR ASSEMBLY ONLY FIVE FLAT TIRES). ASSEMBLY (MAXIMUM CONDITION 1 ANY ONE FLAT TIRE ON ONE OR MORE GEAR CONDITION 2 TWO OR MORE FLAT TIRES ON ANY ONE (MAXIMUM FOUR FLAT CONDITION 3 TWO OR MORE FLAT TIRES ON ANY TWO OR INDICATES FLAT TIRE (EXAMPLE) (K) (J) FOR (J) AND (K) AS FOLLOWS: (I) (H) (G) (F) (I) AS FOLLOWS: EXCEPT FOR (F),(G),(H) AND (A) |40` MAXIMUM NOSE GEAR TURN ANGLE FOR FORWARD TOW OR TAXI WITH BODY GEAR STEER-ING SYSTEM OPERATIVE. (B) |10` MAXIMUM NOSE GEAR TURN ANGLE FOR FORWARD TOW OR TAXI WITH BODY GEAR STEER-ING SYSTEM INOPERATIVE. |10` MAXIMUM NOSE GEAR(C) TURN ANGLE FOR AFT TOW. TOW OR TAXI TO HANGER OR TERMINAL. (D) (E) NOSE GEAR TOWING LIMITED BY (A),(B) AND (C). TOW FROM GEAR ASSEMBLY WITH FLAT TIRES. TOWING SHALL BE SYMETRICAL (I.E. FLATS ON ONE WING GEAR, TOW FROM BOTH WING GEARS). DEFLATE THE SHOCKSTRUT WITH FLAT TIRES. INFLATE THE SHOCKSTRUT ON THE SAME SIDE IF IT IS NECESSARY, TRANS-FER FUEL TO LIMIT PRESSURE ON THE GEAR WITH FLAT TIRES. BALANCE IS WITHIN AMM OF CHROME WILL SHOW ON THE SHOCKSTRUT WITH FLAT TIRES. LIMITS. SAME AS CONDITION 1 ABOVE SAME AS CONDITION 1 ABOVE EXCEPT MAKE SURE THE AIRPLANE INSTALL SERVICEABLE TIRES TO MEET CONDITION 1 ABOVE. TOW AT BOTH MAIN GEARS IF RUNWAY MUST BE IMMEDIATELY CLEARED. OF THE AIRPLANE SO 0.5 INCH 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 TOWING AND TAXIING(19)
