*
Right stop simulation.
The simulation functions make the outputs of the selected WOW cards (left or right) go to the simulated condition.
To simulate air mode when the airplane is on the ground, you use the air simulation function.
To simulate the ground mode if the airplane is on jacks, you use the ground simulation function.
You use the stop simulation function to stop the air or ground simulation.
Training Information Point
To do a simulation, you must use the ground test enable switch (P61). Also, one of these two conditions must be true:
* Primary or secondary external electrical power is available
* Radio altitude is less than 2 feet (from any of the three radio altimeters).
To simulate air mode or ground mode to all the airplane systems, you must do the simulation function for the left and the right WOW cards.
WARNING: PREPARE THE SAFETY SYSTEMS FOR THE AIR MODE BEFORE YOU SIMULATE THE AIR MODE. IN THE AIR MODE, AIRPLANE SYSTEMS CAN OPERATE AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
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777 AIRCRAFT MAINTENANCE MANUAL
AIR/GROUND SYSTEM -SPECIAL FUNCTIONS
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
MAIN LANDING GEAR AND DOORS -INTRODUCTION
General
The two main landing gear absorb landing forces and hold most of the airplane weight when the airplane is on the ground.
The main landing gear doors open to permit MLG operation. The doors close to aerodynamically seal the MLG wheel wells.
Main Landing Gear
Each main landing gear has a six-wheel truck. A truck positioner actuator tilts the truck up and down when the plane is in the air. A drag brace and a side brace hold each gear in the extended position. Lock links hold the drag brace and side brace in the extended position. Over-center toggles, on the lock links, lock the gear in the extended position.
Each main landing gear has these components:
*
MLG drag brace assembly
*
MLG side brace assembly
*
MLG side brace lock links
*
MLG drag brace lock links
*
MLG torsion links
*
MLG truck assembly
*
MLG truck positioner actuator
*
MLG shock strut.
Main Landing Gear Doors
These are the four doors for each main landing gear:
*
MLG body door
*
MLG drag brace door
*
MLG shock strut door
*
MLG trunnion door.
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MAIN LANDING GEAR AND DOORS -INTRODUCTION
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MAIN LANDING GEAR AND DOORS -SIDE BRACE ASSEMBLY, DRAG BRACE ASSEMBLY, AND LOCK LINKS
General
The MLG side brace assembly and the MLG drag brace assembly hold the main landing gear in the extended position. They also supply lateral support to the main landing gear.
Lock links hold the braces in the down position. Toggles on the lock links hold the lock links in the locked position.
MLG Drag Brace Assembly
The MLG drag brace assembly is on the forward side of each main landing gear. The upper and lower drag braces connect by a hinge.
A spindle on the upper drag brace pivots around a fitting in the forward part of the main gear wheel well.
A spindle on the lower drag brace pivots around a fitting on the main gear shock strut.
MLG Drag Brace Lock Links
The MLG drag brace lock links hold the MLG drag brace when the gear is in the extended position. Upper and lower toggles connect to the upper and lower lock links. These toggles move to an over-center locked position when the gear is down. Two springs hold the toggles in the over-center locked position.
MLG Side Brace Assembly
The MLG side brace assembly is on the aft side of the main landing gear. Upper and lower side braces connect by a hinge.
A spindle on the upper side brace pivots around a fitting in the inboard end of the main landing gear beam.
A spindle on the lower side brace pivots around a fitting on the main gear shock strut.
MLG Side Brace Lock Links
The MLG side brace lock links hold the MLG side brace when the gear is in the extended position. Upper and lower toggles connect to the upper and lower lock links. These toggles move to an over-center locked position when the gear is down. Two springs hold the toggles in the over-center locked position.
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