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COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
UNIT - PROXIMITY SWITCH ELECTRONICS, M7838 AIR/GND AIR/GND PSEU SECT 2 - C10005 PSEU SECT 1 - C10004 CIRCUIT BREAKERS -RELAYS - (REF 31-01-36, FIG. 101) RELAYS - (REF 31-01-39, FIG. 101)  ---- 1 1 1  117AL, MAIN EQUIP CTR, E1-3 7F26 7F25 FLT COMPT, P7  32-09-03 

Landing Gear Multiple System/Components - Component Index
Figure 101

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747-400 FAULT ISOLATION/MAINT MANUAL

PSEU/M7838

PROXIMITY SWITCH ELECTRONICS UNIT (PSEU)

Landing Gear Multiple Use System/Components - Component Location
Figure 102

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747-400 MAINTENANCE MANUAL
 AIR/GROUND RELAYS - MAINTENANCE PRACTICES
_________________________________________
 1.  General_______
 A.  This procedure contains these five tasks:
 (1)  
Prepare safety-sensitive systems for air mode simulation (par. 2)

 (2)  
Put the air/ground relay system in the air mode (par. 3)

 (3)  
Put the air/ground relay system back in the ground mode (par. 4)

 (4)  
Put safety-sensitive systems back to the condition before air mode simulation (par. 5)

 (5)  
Find if the air/ground relay system is in the air mode or the ground mode (par. 6).

 B.  
Paragraph 2 (Prepare Safety-Sensitive Systems for Air Mode Simulation) is a task that stops the operation of some systems. You can cause damage to these systems or cause injury when you supply air mode signals on the ground.

 (1)  
Procedures that put systems in the air mode tell you to do the task in paragraph 2 (Prepare Safety-Sensitive Systems for Air Mode Simulation).

 (2)  
You must make sure the procedure to "Prepare Safety-systems for Air Mode Simulation" is done before the air mode simulation.

 C.  
Paragraph 3 (Put the Air/Ground Relay System in the Air Mode) is a task that supplies signals of the air mode to all systems on the airplane. Some maintenance procedures tell you to use this task to supply a signal of the air mode to their systems.

 D.  
Paragraph 4 (Put the Air/Ground Relay System Back in the Ground Mode) is a task that removes signals of the air mode from all systems on the airplane.

 E.  
Paragraph 5 (Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation) is a task that puts the airplane to its usual condition.

 (1)  
When a maintenance procedure switches between air and ground modes more than once, only do the task to put the airplane back to its usual condition after the procedure is complete.

 F.  
Paragraph 6 (Check of the Air Mode/Ground Mode - Air/Ground Relay System) is a task that does a check of the air/ground relay system for the air mode or the ground mode.

 TASK 32-09-02-842-002
 2.  Prepare Safety-Sensitive Systems for Air Mode Simulation________________________________________________________
 A.  References
 (1)  AMM 09-11-00/201, Towing
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747-400 MAINTENANCE MANUAL
 (2)  
AMM 32-00-30/201, Landing Gear Door Locks

 B.
Procedure

 S 492-045
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON ALL THE LANDING
_______ GEARS. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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