(f)
Install the connector with the screws, tighten to a torque of 50 to 60 pound-inches and install the lockwire.
(g)
Remove the old sealant and clean the surfaces adjacent to the switch and the connector with cleaner.
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747-400 MAINTENANCE MANUAL
(h)
Apply a bead of sealant to the switch receptacle flange at the steering actuator cylinder.
F.
Lock Switch Test (primary and alternate).
S 864-012
(1)
Supply electrical power (AMM 24-22-00/201).
S 014-013
(2)
Disconnect the torsion links of the nose landing gear at the apex (AMM 32-21-03/201).
S 014-015
CAUTION:_______HOLD THE STEERING ACTUATORS OF THE BODY LANDING GEAR. DAMAGE TO THE ACTUATORS CAN OCCUR IF THEY ARE PERMITTED TO HANG FREE.
(3)
Disconnect the lower torsion links of the body landing gear from the actuators (AMM 32-53-11/201).
S 224-016
(4)
Make sure that the actuators and fittings are free to move (through the range of travel of each actuator in the extend and retract directions).
S 864-017
(5)
Move the control handle of the landing gear to the DN position.
S 864-018
(6)
Make sure that the rudder trim is at the zero position.
S 864-019
(7)
Make sure that the rudder pedals are in the neutral position.
S 864-020
(8)
Make sure that the tillers of the captain and the first officer are in the neutral position.
S 864-021
(9)
Make sure that the EIU source is set to "AUTO" for the EFIS/EICAS display.
S 864-022
(10)
Make sure the hardware that follows is serviceable:
(a)
EIU
(b)
EICAS
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747-400 MAINTENANCE MANUAL
(c)
PSEU
(d)
CMC
S 864-023
(11)
Close the 7G23 BODY GR STRG ARM AC circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 864-034
(12)
Close the 7G24 BODY GR STRG ARM DC circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 864-025
(13)
Supply hydraulic power to system No. 1 (AMM 29-11-00/201).
S 794-026
(14)
Do a check of the hydraulic connections for leaks.
S 744-027
(15)
Do a BITE test of the steering system of the body landing gear.
(a)
Set to OTHER FUNCTIONS on page 2 of the CDU main menu.
(b)
Set to INPUT MONITORING.
(c)
Write in E/070/271/00 on the scratchpad.
(d)
Push the line select key 1L.
(e)
Push the NEXT PAGE button.
(f)
Write in E/070/273/00 on the scratch pad.
(g)
Make sure that the BITS for label 273 are as shown in the table
(h)
Push the PREVIOUS PAGE button and go to page 1.
(i)
Make sure that the BITS for label 271 are as shown in the table that follows:
that follows:
ALTERNATE LOCK SWITCHES_______________________ BIT___ BIT STATUS__________ DESCRIPTION___________
R BODY GR STRNG LEFT 26 1 LOCKED
R BODY GR STRNG RIGHT 27 1 LOCKED
L BODY GR STRNG RIGHT 28 1 LOCKED
L BODY GR STRNG LEFT 29 1 LOCKED
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