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747-400
MAINTENANCE MANUAL

 B. Body Gear Steering Fault Indication (Fig. 4)
 (1)  
The takeoff aural warning horn will sound if takeoff is attempted with body gear steering actuators not centered and locked.

 (2)  
Normally there is no indication of body gear steering operation. In the event of a fault in the system, advisory and status messages are displayed on EICAS. The hydraulic control module pressure switches, arming switch and arming relays are monitored directly by the EIU. Actuator unlock signals come from the proximity switch electronic unit (PSEU).

 (3)  
Advisory and status message BODY GEAR STRG will be displayed when either of the following conditions exists:

 (a)  
Both the primary and alternate landing gear subsystem inputs from the PSEU indicate a body gear steering actuator unlocked without a steering command.

 (b)  
A hydraulic control module pressure switch indicates pressure without a steering command.

 NOTE: The status message is in non-volatile memory.
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747-400 FAULT ISOLATION/MAINT MANUAL
BODY GEAR STEERING SYSTEM
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
ACTUATORS - STEERING  2  4  BODY LANDING GEAR  32-53-11 
ASSEMBLY - CONTROL MODULE  2  2  BODY GEAR AFT WHEEL WELL  32-53-04 
ASSEMBLY - YOKE  2  2  BODY LANDING GEAR  32-53-11 
CIRCUIT BREAKERS - 1  FLT COMPT, P7-2 
BODY GR STRG ARM DC, C1145  1  7G24  * 
BODY GR STRG ARM AC, C1155  1  7G23  * 
FILTER  2  2  MODULE ASSEMBLY BODY GEAR AFT WHEEL WELL, CONTROL  32-53-08 
MODULE - L HYDRAULIC CONTROL, X358  2  1  LEFT BODY GEAR AFT WHEEL WELL  32-53-04 
MODULE - R HYDRAULIC CONTROL, X343 BODY GR STRG ARMING A, M7500 BODY GR STRG ARMING B, M7501 RELAYS - (REF 31-01-39, FIG. 101)  2  1  RIGHT BODY GEAR AFT WHEEL WELL 32-53-04 
SWITCH - ALTERNATE ACTUATOR LOCK, Y1T502  3  4  BODY LANDING GEAR, INBD AND OTBD, STEERING ACTUATORS  32-53-16 
SWITCH - PRIMARY ACTUATOR LOCK, Y1T501  3  4  BODY LANDING GEAR, INBD AND OTBD, STEERING ACTUATORS  32-53-16 
SWITCH - ARMING, S808  1  1  FWD PASS CABIN 32-53-15 
SWITCH - PRESSURE, YK6S01 3  2  BODY GEAR WHEEL WELL, CONTROL MODULE ASSEMBLY 32-53-05 
TRANSDUCER COMMAND, T163  2  1  117AL, MAIN EQUIP CTR  32-53-01 
UNIT - ELECTRONIC CONTROL, X400  2  1  LEFT BODY GEAR AFT WHEEL WELL 32-53-03 
VALVE - CHECK  2  2  MODULE ASSEMBLY BODY GEAR WHEEL WELL, CONTROL  32-53-14 
VALVE - SERVO, YK6V02  2  2  BODY GEAR AFT WHEEL WELL, CONTROL MODULE ASSEMBLY  32-53-07 
VALVE - SOLENOID, YK6V01  2  2  MODULE ASSEMBLY BODY GEAR WHEEL WELL, CONTROL  32-53-06 

* SEE WM EQUIPMENT LIST
Body Gear Steering System - Component Index
Figure 101

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747-400 FAULT ISOLATION/MAINT MANUAL
P7-2 PANEL
FORWARD PASSENGER
FLIGHT COMPARTMENT  CABIN
SEE A
ARMING SWITCH, S808
ARMING SWITCH, S808
SEE B
INTERCONNECT ACTUATORS (REF)
INBD FWD
FORWARD PASSENGER CABIN A ARMING SWITCH, S808 B
　
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