WARNING:KEEP ALL PERSONS OUT OF THE DANGEROUS AREA
ENTRY  DURING ENGINE OPERATION.  IF THE SURFACE 
5 FEET  CORRIDOR  WIND IS MORE THAN 25 KNOTS, INCREASE THE 
DANGEROUS AREA AT THE ENGINE INLET BY 20 

 PERCENT. 
INLET 
HAZARD  CLEAN THE RAMP IF THERE IS SNOW, ICE, WATER, 
AREA  OIL OR OTHER CONTAMINATION, OR MOVE THE 
AIRPLANE TO A LOCATION THAT IS CLEAN. 

 MAKE SURE THAT ALL PERSONS ARE SAFE BEFORE 
YOU START THE ENGINE. 
MAKE SURE THE PERSONS IN THE FLIGHT COMPART-

 MENT CAN SPEAK TO ALL PERSONS NEAR THE 

 DANGEROUS AREA DURING ENGINE OPERATION. 

 OBEY ALL OF THE GROUND SAFETY PRECAUTIONS 
FOR THE ENGINES. 

 THE ENGINES CAN PULL PERSONS OR UNWANTED 
MATERIALS INTO THEM AND CAUSE INJURIES TO 
PERSONS OR DAMAGE TO EQUIPMENT. 
(2.1 METERS) 7 FEET  CORRIDOR ENTRY  _____NOTE:  ENGINE ONLY. THE DANGEROUS AREA AROUND THE THE DANGEROUS AREA IS SHOWN FOR THE RIGHT 
LEFT ENGINE HAS THE SAME DIMENSIONS.  WHEN 
YOU OPERATE TWO ENGINES, THE DANGEROUS AREA 
IS THE SUM OF THE LEFT AND RIGHT DANGEROUS 
ENTRY CORRIDOR  AREAS. 
A  EXHAUST HAZARD 
AREA 

FORWARD THRUST AT MINIMUM IDLE POWER - COWLING CLOSED
Engine Inlet and Exhaust Hazard Areas
Figure 201 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-00
 ALL  ú ú N01A Page 204 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
160 FEET (49 METERS)
SEEA
5 FEET
(1.5 METERS)
7-FOOT RADIUS
(2.1 METERS)
HAZARD AREA
JET WAKE VELOCITY IS MORE
THAN 35 MPH (56 KPH)
(30 KNOTS) (50 FT/SEC)

_______WARNING:  KEEP ALL PERSONS OUT OF THE DANGEROUS AREA 
DURING ENGINE OPERATION. IF THE SURFACE 
WIND IS MORE THAN 25 KNOTS, INCREASE THE 
DANGEROUS AREA AT THE ENGINE INLET BY 20 
PERCENT. 
CLEAN THE RAMP IF THERE IS SNOW, ICE, WATER, 
OIL OR OTHER CONTAMINATION, OR MOVE THE 
AIRPLANE TO A LOCATION THAT IS CLEAN. 
MAKE SURE THAT ALL PERSONS ARE SAFE BEFORE 
YOU START THE ENGINE. 
MAKE SURE THE PERSONS IN THE FLIGHT COMPART-
MENT CAN SPEAK TO ALL PERSONS NEAR THE 
DANGEROUS AREA DURING ENGINE OPERATION. 
OBEY ALL OF THE GROUND SAFETY PRECAUTIONS 
FOR THE ENGINES. 
THE ENGINES CAN PULL PERSONS OR UNWANTED 
MATERIALS INTO THEM AND CAUSE INJURIES TO 
PERSONS OR DAMAGE TO EQUIPMENT. 
NOTE:_____  THE DANGEROUS AREA IS SHOWN FOR THE RIGHT 
ENGINE ONLY. THE DANGEROUS AREA AROUND THE 
LEFT ENGINE HAS THE SAME DIMENSIONS. WHEN 
YOU OPERATE TWO ENGINES, THE DANGEROUS AREA 
IS THE SUM OF THE LEFT AND RIGHT DANGEROUS 
AREAS. 
45` 

B FORWARD THRUST AT MINIMUM IDLE POWER - COWLING OPEN Engine Inlet and Exhaust Hazard Areas Figure 201 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-00
 ALL  ú ú N01A Page 205 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
590 FEET (180 METERS)
SEE C
HAZARD AREA
JET WAKE VELOCITY IS MORE
THAN 35 MPH (56 KPH)
(30 KNOTS) (50 FT/SEC)

9 FEET _______KEEP ALL PERSONS OUT OF THE DANGEROUSWARNING:(2.7 METERS)
AREA DURING ENGINE OPERATION. IF THE SURFACE WIND IS MORE THAN 25 KNOTS, INCREASE THE DANGEROUS AREA AT THE ENGINE INLET BY 20 PERCENT.
CLEAN THE RAMP IF THERE IS SNOW, ICE, WATER, OIL OR OTHER CONTAMINATION, OR MOVE THE AIRPLANE TO A LOCATION THAT IS CLEAN.
MAKE SURE THAT ALL PERSONS ARE SAFE BEFORE YOU START THE ENGINE.
MAKE SURE THE PERSONS IN THE FLIGHT COMPARTMENT CAN SPEAK TO ALL PERSONS NEAR THE DANGEROUS AREA DURING ENGINE OPERATION.
OBEY ALL OF THE GROUND SAFETY PRE-CAUTIONS FOR THE ENGINES.
　
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