(d)  
Push the line-select key, adjacent to the <INPUT MONITORING display.

 (e)  
Push the CDU keys E/070/270/00.

 (f)  
Push the key 1L.

 (g)  
Push the NEXT PAGE key.

 (h)  
Push the CDU keys E/070/272/00.

 S 722-098
 (5)  
Do the Test of the Up Sensor for the Body Landing Gear:

 (a)  
Push the PREVIOUS PAGE key or the NEXT PAGE key as necessary to show the logic condition that follows:

 -
For the Left Primary Up Sensor (S400): Label 270/00

 -
For the Right Primary Up Sensor (S402): Label 270/00

 -
For the Left Alternate Up Sensor (S1636): Label 272/00

 -
For the Right Alternate Up Sensor (S1637): Label 272/00.

 (b)  
Make sure the CDU display for the label 270/00 or 272/00 is

 (c)
Put the actuator on the applicable sensor, S400, S402 (Primary Up Sensor) or S1636, S1637 (Alternate Up Sensor).

 shown as follows (Fig. 202):
 Sensor and Bit Location___________________________________  Bit State_________  Description___________
 Left Body Gear Down/Lock on Bit 11  1  GEAR DOWN
 Right Body Gear Down/Lock on Bit 14  1  GEAR DOWN
 Left Body Gear Up/Lock on Bit 15  0  NOT UP
 Right Body Gear Up/Lock on Bit 18  0  NOT UP

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A 747-400 MAINTENANCE MANUAL
"INPUT MONITORING" DISPLAY

LINE SELECT KEYS (LSK)
CDU
"INPUT MONITORING" DISPLAY
(EXAMPLE)

Test of the Body Gear Up Sensor with the CMC
Figure 203

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C31242
A
747-400 MAINTENANCE MANUAL
 (d)  
Make sure the CDU display for the label 270/00 or 272/00 is shown as follows (Fig. 202):

 Sensor and Bit Location__________________________________ Bit State________ Description Left Body Gear Down/Lock on Bit 11 1 GEAR DOWN Right Body Gear Down/Lock on Bit 14 1 GEAR DOWN Left Body Gear Up/Lock on Bit 15 1 GEAR UP Right Body Gear Up/Lock on Bit 18 1 GEAR UP

 (e)  
Remove the actuator from the sensor, S400, S402 (Primary Up Sensor) or S1636, S1637 (Alternate Up Sensor).

 (f)  
Push the line-select key, adjacent to the <RETURN display until the CDU MENU shown.

 F.
Put the Airplane in Its Usual Condition

 S 092-095
 WARNING: OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS THE DOORS OPEN
_______ AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Remove the door locks for the landing gear and close the doors (AMM 32-00-30/201).

 (2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 862-096
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A
747-400 MAINTENANCE MANUAL
 BODY GEAR TRUCK TILT SENSOR - MAINTENANCE PRACTICES
___________________________________________________
 1.  General_______
 A.  This procedure contains four tasks. These tasks remove, install, adjust and test the truck tilt sensors for the body landing gear.
 B.  A primary and an alternate sensor are installed on the left and the right body landing gear. There are a total of four truck tilt sensors. Each primary (S419 LH, S418 RH), and alternate (S612 LH, S613 RH), sensor pair is installed on one support bracket.
　
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