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 NOTE: See the paragraph on airplane taxi in bad weather
____ conditions about differential braking.
 a) Decrease the speed of the airplane with the brakes when it is necessary, before you start the turn. b) Make a minimum radius turn with maximum nose wheel steering, body gear steering, and engine thrust only. c) Use of the brakes during a turn will cause the main and nose gear tires to scrub. 8) When it is possible, complete the taxi in a straight line roll for a minimum of 12 feet.
 NOTE: This will remove the torsional stresses in the
____ landing gear components and the tires.
 (h)  Airplane taxi in bad weather conditions. 1) You must know the conditions of the taxi surface, and the taxi speeds when you taxi in bad weather conditions. 2) If the taxi surface has snow, slush, or ice on it, you can
 use the anti-ice system. 3) Taxi the airplane with the flaps up. 4) Use the differential engine thrust when you taxi the
 airplane on a slick surface at decreased speeds. This will help to keep the airplane movement through a turn. 5) A light differential braking can have more of an effect than nose wheel steering, on very slick surfaces.
 (5)  Airplane Characteristics
 (a)  
Figure 202 shows the minimum turn radius that the airplane can make. The wingtip will make the largest arc in a turn and give the minimum clearance path.

 (b)  
The basic factors that can change the geometry of a turn are as follows: 1) The angle of the nose wheel steering 2) The body gear steering 3) The engine power position 4) The CG location on the airplane 5) The airplane gross weight 6) The taxi surface conditions 7) The airplane ground speed 8) The differential braking that you use

 (c)  
When you operate jet engine airplanes, you must follow all precautions. This is necessary to prevent injury to persons, or damage to structures, equipment, or other airplanes. 1) Figure 203 shows the engine hazard areas at idle,

 breakaway, and takeoff power.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 09-21-00
 ALL  ú ú 01 Page 207 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 

_______WARNING:  1.  IF SURFACE WIND IS REPORTED GREATER THAN 
25 KNOTS, INCREASE DISTANCE OF INLET 
BOUNDARY BY 20%.  IF RAMP SURFACES ARE 
SLIPPERY, ADDITIONAL PRECAUTIONS SUCH AS 

 CLEANING THE RAMP WILL BE NECESSARY 
TO PROVIDE PERSONNEL SAFETY. 

2.  
GROUND PERSONNEL MUST STAND CLEAR OF THESE HAZARD ZONES AND MAINTAIN COMMUNICATION WITH FLIGHT COMPARTMENT PERSONNEL DURING ENGINE RUNNING.

3.  
DO NOT USE ENGINE NACELLE SERVICE INTERPHONE JACK ON ENGINE WHICH IS TO BE STARTED OR IS IN OPERATION. PERSONNEL MAY BE INJURED BY ENGINE INLET SUCTION OR EXHAUST BLASTS.

4.  
ENTRY CORRIDOR MUST BE USED ONLY UNDER FOLLOWING CONDITIONS:

A. NOT MORE THAN ONE ENGINE ON EACH SIDE OF AIRPLANE MAY BE OPERATING WHEN PERSONNEL ARE IN ENTRY CORRIDOR.
B. ENGINE OPERATION MAY NOT EXCEED GROUND IDLE THRUST WHILE PERSONNEL ARE IN ENTRY CORRIDOR.
C. POSITIVE COMMUNICATION BETWEEN PERSONNEL IN FLIGHT COMPARTMENT AND PERSONNEL USING ENTRY CORRIDOR IS MANDATORY.
D. INLET AND EXHAUST HAZARD AREAS MUST BE STRICTLY OBSERVED BYZONE PERSONNEL IN ENTRY CORRIDOR.
FORWARD THRUST AT MINIMUM IDLE POWER
Engine Inlet and Exhaust Hazard Areas
Figure 203 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 09-21-00
 ALL  ú ú 01 Page 208 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE B
9 FEET
_______1.
WARNING:
(2.7 METERS)
2.

3.

590 FEET (180 METERS)
HAZARD ZONE
JET WAKE VELOCITY
EXCEEDS 35 MPH (56 KPH)
(30 KNOTS) (50 FT/SEC)

IF SURFACE WIND IS REPORTED GREATER THAN 25 KNOTS, INCREASE DISTANCE OF INLET BOUNDARY BY 20%. IF RAMP SURFACES ARE SLIPPERY, ADDITIONAL PRECAUTIONS SUCH AS CLEANING THE RAMP WILL BE NECESSARY TO PROVIDE PERSONNEL SAFETY.
GROUND PERSONNEL MUST STAND CLEAR OF THESE HAZARD ZONES AND MAINTAIN COMMUNICATION WITH FLIGHT COMPARTMENT PERSONNEL DURING ENGINE RUNNING.
　
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