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757 MAINTENANCE MANUAL
 (c)  You can simulate the air mode with one of the procedures that follows: 1) Lift the airplane with jacks. 2) Put the deactuators on the tilt sensors of the main gear
 and actuators on the sensors of the nose gear.
 3)  If any of the landing gear or tilt sensors are removed, then you will have to connect tilt sensors to the airplane wiring. You will also have to attach actuators to the nose gear tilt sensors and deactuators to the main gear tilt sensors.
 (2)  
When the airplane takes off, the air/ground relays change some of the systems from the ground mode to the air mode. The opposite procedure occurs when the airplane makes a landing. The change between the flight mode and the ground mode occurs through the inputs of these sensors and switches and their related electronics:

 (a)  
The truck tilt sensors of the main landing gear.

 (b)  
The not compressed sensors of the nose landing gear.

 (c)  
The pressure switch for the shuttle valve on the truck positioner.

 (3)  
The PSEU (Proximity Switch Electronic Unit) can put incorrect faults in its memory when the airplane is in the air mode. After the airplane is put back to the ground mode it will be necessary to erase the PSEU memory.

 B.  
Equipment

 (1)  
Proximity Sensor Actuator/Deactuator Set -A27092-84

 NOTE: Two rectangular sensor actuators, four
____
 rectangular deactuators, and, on some
 airplanes, one circular deactuator is
 needed for this test.

 NOTE: The actuators and deactuators are not
____
 necessary if you lift the airplane to
 simulate the air mode.

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MAINTENANCE MANUAL

 (2)  
If a landing gear or tilt sensor is removed, then you will need proximity sensors for that gear.

 C.
References

 (1)  
AMM 07-11-01/201, Jacking Airplane

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 32-00-20/201, Landing Gear Downlocks

 D.
Access

 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Control Cabin
 711 Nose Landing Gear
 731/741 Main Landing Gear

 (2)  
Access Panels
 119BL Main Equipment Center

 E.
Prepare to Simulate the Air Mode

 S 862-003
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-065

 (2)  
Look at P11 panel at grid location 11C19, and identify the circuit breaker name that is at this location.

 (a)  
Airplanes with "Landing Gear Pos Sys 2 Altn" circuit breaker installed at panel grid location 11C19, make sure this circuit breaker is closed: 1) 11C19, LANDING GEAR POS SYS 2 ALTN

 S 862-004
 (3)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:

 (a)  
11C30, LANDING GEAR POS SYS 1

 (b)  
11S15, LANDING GEAR AIR/GND SYS1

 (c)  
11S19, LANDING GEAR AIR/GND SYS2

 (d)  
11S23, POS SYS 2

 S 862-011
 (4)  
GUN 006-999; Make sure this circuit breaker on the main power distribution panel, P6, is closed:

 (a)  
6C3, HYD GEN CONT
　
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