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A
747-400 MAINTENANCE MANUAL
S 865-299
WARNING:_______ MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE LANDING
GEAR AND DOOR OPERATION AREA. A FAST MOVEMENT OF THE LANDING
GEAR AND DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
(8)
Make sure that all persons are away from the landing gear and the landing gear doors.
S 865-300
(9)
Move the landing gear lever from the UP to the DN position.
NOTE: The nose gear down/lock bit will show a state of 0 when the
____ gear are in transit. Look at the CDU display for the nose gear down/lock bit while the gear is in transit.
(a) Look at the bit status for the nose gear down and locked sensors while the gear is in transit, as follows: 1) Make sure the CDU shows shows the bit status of label
273/00 as follows:
~........................................................ |Sensor and Bit Location | Bit State | Description | .......................................................... |Nose Gr Down/Lock on Bit 18| 0 |NOT DOWN/LOCK| 2...........................…..............….............1
(b) Make sure all the landing gear go down and the gear doors close.
S 865-301
(10)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P7 Overhead Circuit Breaker Panel 1) 7F22 LANDING GEAR DSP & CONT PRI
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747-400 MAINTENANCE MANUAL
2) 7F25 PSEU SECT 1
I. Put the Airplane in Its Usual Condition
S 495-289
(1)
Install the ground lock pins in the landing gear (AMM 09-11-00/201).
S 585-287
(2)
Lower the airplane from the jacks, if it is not necessary
(AMM 07-11-01/201).
S 445-288
(3)
If the airplane is lowered from the jacks, do this task: Put the Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation (AMM 32-09-02/201).
S 865-285
(4)
Remove hydraulic pressure from hydraulic systems 1 and 4, if it is not necessary (Amm 29-11-00/201).
(5)
Remove electrical power, if it is not necessary (AMM 24-22-00/201).
S 865-286
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747-400 MAINTENANCE MANUAL
NOSE GEAR SQUAT SENSOR - MAINTENANCE PRACTICES
______________________________________________
1. General_______
A. This procedure contains six tasks. These tasks remove, install, test and measure the squat sensors and squat sensor targets for the nose landing gear.
B. The nose landing gear has a primary and an alternate squat sensor. The sensors attach on the forward side of the outer cylinder of the shock strut for the nose landing gear. You can find the squat sensor target attached to the bracket assembly at the bottom of the upper torsion link.
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