*
The interlock pushes down on the floor fitting and turns to release the end crank.
Door Latched, Escape Slide Armed
When you move the mode select lever to the auto position, the push/pull cable turns the torque tube. The torque tube turns the end crank. The crank turns the hook.
When the hook turns, the outboard end moves up to releases the girt bar and releases the lock pawl. The spring in the lock pawl lifts the pawl and lowers the flag.
The lock pawl locks the girt bar to the floor. The door is in the auto mode. The flag in the witness port indicates the door is in the auto mode.
If you unlatch and open the door, the girt bar stays locked to the floor. The bar pulls the escape slide/raft out of the door.
Training Information Point
The interlock must release the end crank before you can move the mode select lever to the arm position. If you cannot move the lever to the arm position, it may show a blockage problem.
Make sure there is no unwanted material around the door bottom that keeps the door from moving completely outboard as it closes. When the door is not completely outboard, the floor fitting will not push the interlock sufficiently to release the end crank.
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PASSENGER ENTRY DOOR SYSTEM -GIRT BAR MECHANISM -FUNCTIONAL DESCRIPTION
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PASSENGER ENTRY DOOR SYSTEM -EMERGENCY POWER ASSIST SYSTEM (EPAS) -INTRODUCTION
Purpose
The emergency power assist system (EPAS) supplies mechanical power to open the passenger entry door in emergencies.
Physical Description
The EPAS has these components:
*
Reservoir
*
Actuator
*
Battery pack.
General Description
Power from the EPAS battery fires the squib on the reservoir when you move the internal door handle to open with the mode select handle in the AUTO mode. The squib breaks the rupture disc on the reservoir.
Compressed nitrogen gas from the reservoir goes through a tube to the actuator. Gas expansion in the actuator pushes on piston attached to the rod. This moves the chain. The chain pulls on the fixed sprockets to open the door open.
Training Information Point
A safety switch on the battery pack lets you inhibit the EPAS operation when you do door maintenance. The switch disconnects the battery from the squib circuit.
A test switch and a red test indicator light on the bottom of the battery let you do a test of the battery for a sufficient charge. You put your hand below the hinge cover to push the switch. You do not have to open the cover. If the battery has a sufficient charge, the red indicator light comes on. The light is red so you can see it reflect off of your hand. You do not have to look directly at the light.
A gage on the forward end of the reservoir lets you know if the pressure in the reservoir is sufficient. You can see the gage through a hole in the hinge cover.
You cannot close the door when there is pressure in the actuator. It takes five minutes for actuator pressure to bleed down after the EPAS has fired.
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D633W101-BEJ May 05/2003
PASSENGER ENTRY DOOR SYSTEM -EMERGENCY POWER ASSIST SYSTEM (EPAS) -INTRODUCTION
EFFECTIVITY BEJ ALL 52-11-00
Page 47
D633W101-BEJ May 05/2003
PASSENGER ENTRY DOOR -EMERGENCY POWER ASSIST SYSTEM (EPAS) -FUNCTIONAL DESCRIPTION
Functional Description
The emergency power assist system (EPAS) gets electrical power for its batteries from the same source as the emergency lights power supplies. See the emergency lights section for more information (SECTION 33-50).
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