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A
747-400
MAINTENANCE MANUAL
550 FEET (170 METERS) (475 METERS) 1,560 FEET
40 FEET (12 METERS)
SEE C
HAZARD ZONE
JET WAKE VELOCITY
EXCEEDS 35 MPH (56 KPH)
(30 KNOTS) (50 FT/SEC)
9 FEET
(2.7 METERS)
WARNING:
18 FEET
(5.5 METERS) C
40 FEET (12 METERS)
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.
FORWARD THRUST AT TAKEOFF POWER
Engine Inlet and Exhaust Hazard Areas
Figure 203 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400
MAINTENANCE MANUAL
HAZARD ZONE
HAZARD ZONE OUTBOARD ENGINES (EXAMPLE) _______ TO PROVIDE PERSONNEL SAFETY. CLEANING THE RAMP WILL BE NECESSARY ADDITIONAL PRECAUTIONS SUCH AS IF RAMP SURFACES ARE SLIPPERY, DISTANCE OF INLET BOUNDARY BY 20%. GREATER THAN 25 KNOTS, INCREASE
2. PERSONNEL DURING ENGINE RUNNING. COMMUNICATION WITH FLIGHT COMPARTMENT OF THESE HAZARD ZONES AND MAINTAIN GROUND PERSONNEL MUST STAND CLEAR
3. INLET SUCTION OR EXHAUST BLASTS. PERSONNEL MAY BE INJURED BY ENGINE TO BE STARTED OR IS IN OPERATION. INTERPHONE JACK ON ENGINE WHICH IS DO NOT USE ENGINE NACELLE SERVICE
REVERSE THRUST AT MINIMUM IDLE POWER
Engine Inlet and Exhaust Hazard Areas
Figure 203 (Sheet 4)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
2) All persons must keep away from the engine inlet and exhaust areas. Hot, high velocity gasses come out of the exhaust nozzle of the engine. The velocity of the engine fan air, specially at high thrust positions, is sufficient to cause serious injury or death to persons.
3) When the thrust reverser is in the reverse position, the fan air will come out forward. The exhaust gases will continue to come out rearwards.
(d) Figure 204 shows the angles of view from the flight compartment for a crewman in the left seat that is correctly adjusted.
B. References
(1)
24-22-00/201, Manual Control
(2)
29-11-00/201, Main Hydraulic Supply Systems
(3)
71-00-00/201, Power Plant
C. Prepare to Taxi
S 842-002
(1) Use an airline taxi checklist to prepare the airplane for taxi.
S 422-023
CAUTION: MAKE SURE ALL ENGINE COWLS ARE CLOSED AND LATCHED BEFORE YOU
_______ TAXI THE AIRPLANE. IF THE ENGINE COWLS ARE NOT CLOSED, YOU CAN DAMAGE THEM WHEN YOU MOVE THE AIRPLANE.
(2) As a minimum to prepare for the taxi, do these steps:
(a) Examine the external areas of the airplane. 1) Make sure that the wheel chocks are installed. 2) Make sure that all cowling, doors, and hatches are closed
or put in a satisfactory position. 3) Make sure that the engine inlets and exhausts are clear. 4) Make sure that the flight control surfaces have sufficient
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