S 765-182
(10)
Make sure that 28 volts dc is not found at the connector DM7838 CA, pin A13, on the E1 shelf.
S 435-202
(11)
Install the PSEU (AMM 32-09-03/401)
(a)
Close these circuit breakers:
1) P7 Overhead Circuit Breaker Panel a) 7F22 LANDING GEAR DSP & CONT PRI b) 7F23 LANDING GEAR DSP & CONT ALTN c) 7F25 PSEU SECT 1 d) 7F26 PSEU SECT 2
G. Put the Airplane in Its Usual Condition
NOTE: Do not do these steps if you will continue to do the other tasks
____
in this procedure.
S 445-163
(1)
Do this task: Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation (AMM 32-09-02/201).
S 865-203
(2)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).
TASK 32-61-00-705-001
4. Test of the Tilt Position Sensors and the Gear Lever Switch
___________________________________________________________
A. General
(1)
This test makes sure the landing gear lever switch, interlock solenoid, and the tilt sensors operate correctly.
B.
References
(1)
AMM/09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 32-00-30/201, Landing Gear Door Locks
(5)
AMM 32-09-02/201, Air/Ground Relays
C.
Special Tools and Equipment
(1)
A27092-84 - Actuator/Deactuator Set - Proximity Sensors
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A
747-400
MAINTENANCE MANUAL
D. Access
(1)
Location Zone
735 Left Wing Landing Gear
745 Right Wing Landing Gear
755 Left Body Landing Gear
765 Right Body Landing Gear
E.
Preconditions
S 865-309
(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).
F.
Prepare the Airplane for the Test (Fig. 502)
S 045-257
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE SPEED
_______ BRAKES. THIS PROCEDURE CAN CAUSE THE SPEED BRAKES TO OPERATE. THE ACCIDENTAL OPERATION OF THE SPEED BRAKES CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Do this task: "Prepare Safety-Sensitive Systems for the Air Mode" (AMM 32-09-02/201).
NOTE:____It is not necessary to do this task: "Put the air/ground relay system in the air mode".
S 865-008
(2) Make sure that hydraulic systems 1 and 4 are not pressurized (AMM 29-11-00/201).
S 495-091
WARNING: MAKE SURE THE GROUND LOCKPINS ARE INSTALLED IN ALL THE LANDING
_______ GEAR TO PREVENT THE ACCIDENTAL OPERATION OF THE GEAR. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF THE GEAR RETRACTS.
(3) Make sure the ground lockpins for the landing gear are installed (AMM 09-11-00/201).
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A 747-400 MAINTENANCE MANUAL
"INPUT MONITORING" DISPLAY
LINE SELECT KEYS (LSK)
CDU
"INPUT MONITORING" DISPLAY
(EXAMPLE)
Test of the Landing Gear and Door Sensors with the CMC
Figure 502
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