(3)
C00582 Primer - SS-4004
C.
References
(1)
24-22-00/201, Manual Control
(2)
29-11-00/201, Main Hydraulic Supply System
(3)
32-00-30/201, Landing Gear Door Locks
(4)
32-09-02/201, Air/Ground Relay System
(5)
32-09-03/501, Proximity Switch Electronics Unit
(6)
IPC 32-61-10 Fig. 21
D.
Access
(1)
Location Zone
114 Nose Wheel Well, RH (Forward Bulkhead)
E.
Install the Door Warning Sensor (Fig. 201)
S 492-010
WARNING:_______OBEY THE INSTALLATION 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)
Make sure the door locks for the nose gear door are installed (AMM 32-00-30/201).
S 422-011
(2)
Install the sensor:
(a)
Twist the sensor leads.
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A 747-400 MAINTENANCE MANUAL
(b) (c) (d) Attach a line to the ends, and put them thru the conduit.Install the sensor mounting bracket if removed.Install the sensor with mounting screws.
NOTE:____ A correctly installed sensor will have the necessary clearance as shown in view A-A, Fig. 201. Adjustment of the clearance is usually not necessary. Do a check of the clearance, if you have any of these conditions: - The sensor mounting bracket is moved - The door is replaced - The doorstop is adjusted.
(e) (f) (g) 1) Install the screw head on the sensor side.Cut the sensor leads to the correct length and install the terminal lugs.Connect the sensor leads to the terminal strip.Do a check of the terminals and the colors for the correct connection.
CAUTION:_______ FAILURE TO SEAL THE OPEN ELECTRICAL TERMINALS CAN CAUSE
SHORTED OR BURNED SWITCHES. THIS IS CAUSED BY
CONTAMINATION, SUCH AS DETERGENT WATER, WHICH GOES INTO
UNSEALED JUNCTION BOXES.
(h) Seal the open electrical terminals. 1) Clean the bare surface of the terminals with the solvent. 2) Use a brush to apply a thin layer of the primer on the bare
surface of the terminals. a) Let the primer dry. 3) Apply the sealant on the bare surface of the terminals with a short bristle brush.
S 412-012
(3) Install the cover on the junction box (J26).
S 092-013
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.
(4)
Remove the door lock from the nose gear door (AMM 32-00-30/201).
S 862-014
(5)
Close the applicable circuit breaker on the Overhead Circuit Breaker Panel, P7:
(a)
7F23 LANDING GEAR DSP & CONT ALTN
(b)
7F22 LANDING GEAR DSP & CONT PRI
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747-400 MAINTENANCE MANUAL
S 442-029
(6)
Do this task: Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation (Ref 32-09-02/201).
F.
Adjust the Door Warning Sensor
S 822-017
(1)
Do these steps to adjust the sensor:
(a)
Make sure that the clearance is as shown in Fig. 201, view A-A. 1) If the clearance is not as shown, do the subsequent steps: a) Loosen the bolt which attaches the angle bracket to the mounting bracket. b) Move the angle bracket forward or aft until the
clearance is as shown in Fig. 201. c) Tighten the angle bracket mounting bolt.
G. Do a Test of the Door Warning Sensors
S 742-030
(1) Use the table that follows to identify the port/label and bit data necessary in the subsequent steps.
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