32-46-03
MONITORING SYSTEM ú ú 03 Page 402 ú May 28/99
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757 MAINTENANCE MANUAL
TASK 32-46-03-404-013
3. Install the Brake Temperature Sensor (Fig. 401)____________________________________
A. References
(1)
AMM 32-41-10/401, Main Gear Wheel Brake
(2)
AMM 32-46-00/501, Brake Temperature Monitor System Test
B.
Access
(1)
Location Zones
211 Control Cabin, Left
212 Control Cabin, Right
731 Landing Gear Left
741 Landing Gear Right
C.
Procedure
S 424-001
(1)
Attach the sensor to the brake with two screws (Detail A).
S 424-002
(2)
Install lockwire.
S 434-003
(3)
Connect the electrical connector to the sensor.
(a)
Tighten the electrical connector hand tight. Then turn it until you hear 3 or 4 clicks or 2/3 turns.
(b)
The color band on the base of the connector should not be visible, or at least barely visible when it is sufficently tight.
(4)
Connect the brake rod to the brake assembly (AMM 32-41-10/401).
S 864-005
(5)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on panel P11:
(a)
11S16, BRAKE TEMP
(6)
Do a test of the brake temperature sensor (AMM 32-46-00/501).
S 434-004
S 714-006
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BRAKE TEMPERATURE ú
32-46-03
MONITORING SYSTEM ú ú 03 Page 403 ú May 28/02
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757 MAINTENANCE MANUAL
NOSE WHEEL STEERING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________
1. General (Fig. 1, Fig. 2)_______
A. The nose wheel steering system is hydraulically powered by the 'gear down' lines of the left hydraulic system. As a backup hydraulic power source, the right system can input hydraulic power through a power transfer unit interface when the left system is unavailable (AMM 29-00-00/001). Hydraulic steering pressure is removed when the landing gear handle is not in the down position.
B. The nose wheel steering system is controlled by two means:
(1)
ALL EXCEPT GUN 051; The captain's sidewall mounted tiller can be used to turn the nose wheels 65 degrees left or right of center for ground maneuvering.
(2)
GUN 051; The captain's and/or first officer's sidewall mounted tiller(s) can be used to turn the nose wheels 65 degrees left or right of center.
(3)
The rudder pedals provide limited steering control of 5 degrees left or right of center, when the nose gear is compressed, for takeoff and landing roll steering.
C.
The tiller is connected by control cables to a summing bar mechanism on the nose landing gear strut which functions to input mechanical signals through a metering valve. The metering valve then provides hydraulic power to two steering actuators which connect to a steering collar. The steering collar in turn connects to the lower steerable position of the shock strut by torsion links.
D.
Any relative movement of the control cables from either the tiller or rudder pedals will displace the summing bar which mechanically signals a deviation between the commanded and actual wheel position. This deviation signal moves the metering valve slide to pressurize the steering actuators in the proper direction to correct the condition. When the lower steerable strut position matches the commanded (tiller or rudder pedal) position, the summing bar is again centered which also centers the metering valve.
E.
Rudder pedal steering is provided by an interconnect mechanism which working along with a piston position system and its cables, drives an eccentric arm to engage or disengage rudder pedal input into the nose wheel steering system. This mechanism also isolates the rudder pedals from the tiller controlled steering system when the nose gear is unloaded and the shock strut is extended.
32-51-00
ALL ú ú 06 Page 1 ú Jan 28/01
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757
MAINTENANCE MANUAL
RUDDER
JACKSHAFT
PULLEY MECHANISM
(EXAMPLE) TURNBUCKLE (4 LOCATIONS)
INTERCONNECT
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