757
FAULT ISOLATION/MAINT MANUAL
FLIGHT COMPARTMENT
Nose Wheel Steering System - Component Location
Figure 102A (Sheet 1)
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757 FAULT ISOLATION/MAINT MANUAL
LEFT FORWARD QUADRANT AND JACKSHAFT ASSEMBLY (REF)
GEARBOX TILLER AND ASEE RUDDER PEDALS (REF) STEERING CABLES SHT 3 CARTRIDGE AND SPRING DRUM AND LINK ESEE
SEE FORWARD QUADRANT CSEE DRUM TORQUE LIMITER BSEE TILLER AND GEARBOX A SEE SHT 3 MECHANISM INTERCONNECT RUDDER PEDAL D SHT 3F AND METERING VALVE STEERING ACTUATORS SEE (REF) NOSE GEAR
TILLER HANDLE
(REF) INDICATOR
GEARBOX
TILLER AND GEARBOX
TORQUE LIMITER DRUM
A
B
FORWARD QUADRANT(FIRST OFFICER'S)
C
Nose Wheel Steering System - Component Location
Figure 102A (Sheet 2)
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757
FAULT ISOLATION/MAINT MANUAL
INTERCONNECT QUADRANT (REF)
STEERING CRANK (REF)
FWD
CLUTCH (REF) STEERING ARM ECCENTRIC DRUM (REF) INBD METERING VALVE MODULE
RUDDER PEDAL STEERING INTERCONNECT MECHANISM
D
CONTROL DRUM STEERING COLLAR
LINK MECHANISM SUMMING STEERING ACTUATOR
SPRING CARTRIDGE E STEERING ACTUATORS AND METERING VALVE
UPPER TORSION LINK (REF)
STEERING COLLAR
CONTROL DRUM AND LINK AND SPRING CARTRIDGE
F
Nose Wheel Steering System - Component Location Figure 102A (Sheet 3)
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757 MAINTENANCE MANUAL
NOSE WHEEL STEERING SYSTEM - ADJUSTMENT/TEST
____________________________________________
1. General_______
A. The steering system is controlled by two separate cable loops. Each loop is labeled with an abbreviation and a suffix for each half of the loop. One loop is NGPPA and NGPPB (Nose Gear Piston Position A and B) and the other loop is labeled NWSA and NWSB (Nose Wheel Steering A and B).
(1)
The NGPPA and NGPPB cables change the steering system from the ground mode to the air mode and back again. When tension is increased on NGPPA the system changes to the air mode. When tension is increased on NGPPB the system changes to the ground mode. The air/ground mode is controlled by the extension and compression of the nose gear. With the torsion links disconnected, you can lower the top torsion link (44) to simulate the air mode. This will turn the quadrant (46) above the spring cartridge (45) to the stop at the full clockwise position. You can raise the top torsion link (44) to turn the quadrant (46) full counterclockwise to simulate the ground mode.
(2)
The NWSA and NWSB (Nose Wheel Steering A and B) cables are used to make an input to the nose wheel steering metering valve. When you increase tension on NWSA a left turn is commanded. When you increase tension on NWSB a right turn is commanded.
B.
There are two adjustable control rods that connect to the rudder interconnect mechanism. One of the control rods, called the eccentric rod (Fig. 501, Item 30), connects from the airplane structure to the eccentric arm (26). The other control rod, called the input rod for the rudder pedal steering (20), connects from the rudder system to the steering crank (25A).
NOTE: Neither of these rods should normally require adjustment.
____ However, you must adjust either one or both rods if there is any movement of the nose gear when the nosewheel steering system is cycled between the air mode and ground mode with hydraulic power on. Adjustment of these control rods is covered in paragraph 6, Rigging of the NWS System.
C. This procedure contains the tasks that follow:
(1)
General Rigging Check of Nose Wheel Steering System
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