(a)  
7F22 LANDING GEAR DSP & CONT PRI

 (b)  
7F25 PSEU SECT 1

 I.
Put the Airplane in Its Usual Condition

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A
747-400 MAINTENANCE MANUAL
 S 865-223
 WARNING: USE THE PROCEDURE IN AMM 32-00-30/201 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Remove the door locks for the landing gear and close the doors (AMM 32-00-30/201).

 S 445-224

 (2)  
Do this task: Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation (AMM 32-09-02/201).

 S 865-225

 (3)  
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 TASK 32-61-00-705-267
 7.  Alternate Test of the Landing Gear Position Indication and Door Warning_______________________________________________________________________ Sensors_______
 A.  General
 (1)  
The position indication test makes sure that each gear, door, and gear lever position sensor sends the correct position indication signal to the PSEU.

 (2)  
It is necessary for the airplane to be on jacks so the landing gear can be retracted and extended.

 (3)  
This task can be done instead of the tasks that follow:

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

 (b)  
Test of Landing Gear Position Indication

 (c)  
Test of the Door Warning Sensors

 B.  
References

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

 (2)  
AMM 09-11-00/201, Towing

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (5)  
AMM 32-09-02/201, Air/Ground Relays

 C.
Access

 (1)  
Location Zone
 715 Nose Landing Gear
 735 Left Wing Landing Gear
 745 Right Wing Landing Gear
 755 Left Body Landing Gear
 765 Right Body Landing Gear

 D.
Preconditions

 S 865-312
 (1)  
These conditions are necessary for this task:

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

 (b)  
Hydraulic systems No. 1 and 4 power on (AMM 29-11-00/201).

 (c)  
Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).

 E.
Prepare for the Test (Fig. 502)

 S 865-268
 (1)  
Make sure the landing gear lever is in the OFF position.

 S 865-272

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 865-271

 (3)  
Pressurize hydraulic systems 1 and 4 (AMM 29-11-00/201).

 S 865-291

 (4)  
Make sure these circuit breakers are closed:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F22 LANDING GEAR DSP & CONT PRI
 2) 7F23 LANDING GEAR DSP & CONT ALTN
 3) 7F25 PSEU SECT 1
 4) 7F26 PSEU SECT 2

 S 865-275
 (5)  Make sure the landing gear is not turned (steering system is centered).
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 32-61-00
　
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