Rudder Pedal Steering Interconnect Mechanism
Figure 4 (Sheet 1)
32-51-00
ALL ú ú 03 Page 9 ú Dec 20/91
A
757
MAINTENANCE MANUAL
UPPER SUPPORT BRACKET (REF) RETAINING BOLTNUT
SPACER INPUT ROD FOR RUDDER PEDALSTEERING STEERINGQUADRANT STEERING CRANK
SPACER
SPACER
STEERING CLUTCH ARM ECCENTRIC
ECCENTRIC DRUM ARM
SHAFT
STEERING
CRANK CAM LOWER SUPPORT FOLLOWER BRACKET (REF)
TIE ROD STEERING
CRANK
INPUT ROD FOR OUTBD ECCENTRIC
RUDDER PEDAL ARM CAM
STEERING FOLLOWER
CRANK STEERING A-A ARM CLUTCH ARM PIVOT QUADRANT/CLUTCH STEERING
CLUTCH
ARM TO SUMMING
MECHANISM GROUND POSITION - RUDDER PEDAL
STEERING STEERING CONNECTED
CAM QUADRANT
FOLLOWER
(2 LOCATIONS) NWSB CRANK CAM STEERING
FOLLOWER
CENTERING GEAR
SPRINGS EXTEND
(2 LOCATIONS)
TO PISTON STEERINGTO TILLER POSITION CRANKMECHANISM
ECCENTRIC
ARM ECCENTRIC ARM CAM
CAM FOLLOWER NGPPA FOLLOWER(2 LOCATIONS) NGPPB
CLUTCH ARM CONTROL CABLE DRUM ROD
BEARING STEERING
INBD QUADRANT/CLUTCH ARM PIVOT
(VIEW ROTATED 180`) FWD FLIGHT POSITION - RUDDER PEDAL
C STEERING DISCONNECTED
Rudder Pedal Steering Interconnect Mechanism Figure 4 (Sheet 2)
32-51-00
ALL ú ú 05 Page 10 ú Dec 20/91
A
E.
F.
G.
757
MAINTENANCE MANUAL
(b) The second set of cables (NGPP) is used to engage and disengage
rudder pedal steering system.Spring Cartridge and Piston Position Quadrant (Fig. 5)
_____________________________________________
(1)
The spring cartridge attaches between the upper torsion link and the shock strut mounted piston position quadrant. The spring cartridge moves the piston position quadrant into either of two positions depending on whether the gear is compressed or extended.
(2)
The piston position quadrant moves through an angular displacement of approximately 23 degrees between preset steps in the quadrant attach bracket on the shock strut.
(3)
When the gear is extended the spring cartridge moves downward to rotate the quadrant clockwise 23 degrees. This action disengages rudder pedal steering. When the gear is compressed the spring cartridge moves upward to rotate 23 degrees. This action engages the rudder pedal steering system through the interconnect mechanism.
Summing Mechanism and Broken Cable Compensator (Fig. 6)
______________________________________________
(1)
The summing mechanism consists of two lever assemblies, left and right, a valve input lever, a splined shaft and a valve input rod.
(2)
Under normal conditions, any steering command is transmitted by the steering cable (NWS) to the lever assembly and associated force link which drives the input roller and cam. The cam and valve input lever are splined on the common shaft and as a result the valve input rod is driven by the input lever.
(3)
The broken cable compensator consists of two force links, left and right, and a roller and a cam which work in conjunction with the summing mechanism.
(4)
The broken cable compensator is connected to the steering valve input lever and prevents cable tension to cause a sustained input to the steering system if the left or right cable looses tension. As long as tension exists in both cables the force links keep the roller engaged in the mating cam detent. When tension is lost in one cable the force links disengage the roller from the cam detent, losing any sustained unbalanced steering force capability.
Steering Metering Valve Module and Actuators (Fig. 2, Fig. 7)
____________________________________________
(1) The steering metering valve is attached to the upper steering plate on the nose gear shock strut and its function is to control the amount of hydraulic fluid provided to the two steering actuators.
32-51-00
ALL ú ú 06 Page 11 ú Jan 28/01
A
757
MAINTENANCE MANUAL
SEE A BOLT LINK (TYPICAL 2 LOCATIONS) TRAVEL STOP 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3(96)
