S 862-085
(15)
Supply electrical power to the airplane.
(a)
To use external power during towing, connect the power cable from the tow vehicle to the external power receptacle No. 1 (Ref 24-22-00/201).
(b)
Do these steps to use power from the APU generators during towing: 1) Start and operate the APU (Ref 49-11-00/201). 2) Supply APU generator power to the ground handling/ground
service busses (Ref 24-22-00/201).
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747-400
MAINTENANCE MANUAL
SEE A AFT
SEE B
TOW PIN
NOSE GEAR GROUND LOCKPIN LOCKPIN REMOVAL AND INSTALLATION TOOL NOSE GEAR GROUND NOSE LANDING GEAR
SUMMING LEVER AND STEERING VALVE PROTECTIVE COVER
ACCESS HOLE
TOW PIN
A B
Wing Body and Nose Landing Gear Ground Lockpin Installation
Figure 201 (Sheet 1)
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747-400
MAINTENANCE MANUAL
SEEC SEED
WING GEAR GROUND LOCKPIN
BODY GEAR GROUND LOCKPIN
C
D
Wing Body and Nose Landing Gear Ground Lockpin InstallationFigure 201 (Sheet 2)
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MAINTENANCE MANUAL
900 11.0% 24.8% 20.0% 873,000 41% MAC
8.5% 853,000 STATIC TIPPING LIMIT
800 803,000 33% BODY GEAR LOAD LIMIT
778,000 MAX TAXI WEIGHT FOR TOWING WITH STEERING LINKS DISCONNECTED ENVELOPE NORMAL 745,900 38.57% 723,000 780,000
700 0%
NOSE GEAR LOAD LIMIT 629,600
600 564,000 580,000 13% AFT CG TOWING TIPPING LIMIT WITH 82,000 TOW BAR LOAD
500
AIRPLANE GROSS WEIGHT (LBS)
410,000
-10 0 10 20 30 AIRPLANE CENTER OF GRAVITY IN %MAC 40
Figure 202 (Sheet 1) Towing Center of Gravity Limitations
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MAINTENANCE MANUAL
900
STATIC TIPPING LIMIT
BODY GEAR
LOAD LIMIT
800
700
NOSE GEAR LOAD LIMIT
600
AIRPLANE GROSS WEIGHT (THOUSAND POUNDS)
AFT CG TOWING TIPPING LIMIT 82,000 TOW BAR
500
AIRPLANE CENTER OF GRAVITY (%MAC)
Towing Center of Gravity Limitations
Figure 202 (Sheet 2)
C31230
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747-400 MAINTENANCE MANUAL
S 862-012
(16) Supply hydraulic power (Ref 29-11-00/201).
(a) If the APU is not used and external electrical power is available: 1) Supply pressure to the hydraulic system No. 4.
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