(3)  
Test of the Tilt Position Sensors and the Gear Lever Switch

 (4)  
Test of Landing Gear Position Indication

 (5)  
Test of the Door Warning Sensors

 (6)  
Alternate Test of the Landing Gear Position Indication and Door Warning Sensors

 (a)  
It is necessary for the airplane to be on jacks for this task, so that the gear can be extended and retracted.

 (b)  
This task lets you examine the logic condition of related landing gear and door sensors simultaneously with the CMCS.

 (c)  
This task can be done instead of the tasks that follow: 1) Test of the Tilt Position Sensors and the Gear Lever Switch 2) Test of Landing Gear Position Indication 3) Test of the Door Warning Sensors

 B.  
These tests can be done individually or as one complete test. The removal/installation procedures for the sensors have the operational tests at the sensor level.

 TASK 32-61-00-745-256
 2.  Ground Test - PSEU Primary and Alternate Landing Gear Systems_____________________________________________________________
 A.  General
 (1)  
This test looks for sensor input failures for the primary and alternate indication systems for the landing gear of the PSEU. The ground test also does a check of the electronics in the PSEU for these subsystems of the PSEU.

 (2)  
To do a ground test for the PSEU, refer to AMM 32-09-03/501.

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 B.
C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 (3)  
There is a simple gear swing and EICAS message test in AMM 32-32-00/501. This test will do a simple function check of the landing gear system. If you do not need to test the sensor status to the bit level then you may want to do this quick test: AMM 32-32-00/501, Gear Swing.

References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)
AMM 32-09-02/201, Air/Ground Relay SystemsAccess

 (1)  
Location Zones 221 Control Cabin, LH 222 Control Cabin, RH

Preconditions
 S 865-307
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS) is serviceable

 (AMM 31-61-00/501).Prepare for the Test
 S 865-243
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-249

 (2)  
Make sure the control lever for the landing gear is in the DN position.

 S 865-244

 (3)  
Make sure that all doors for the landing gear are in the same configuration.

 NOTE: All the gear doors must be open, or all the gear doors must
____
 be closed.

 You can look at the EICAS "GEAR" synoptic page to do get the condition of the doors.
 S 865-245
 (4)  
Do this task if the airplane is not in the ground mode configuration: "Put the Air/Ground Relay System Back in the Ground Mode" (AMM 32-09-02/201).

 S 865-247

 (5)  
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.

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747-400 MAINTENANCE MANUAL
 S 745-248
 (6)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
　
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