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The battery test circuit does a check of the battery and the position of the safety switch. When you hold the test switch in, the red test indicator light comes on if there is sufficient voltage to ignite the squib, and the safety switch is set to ARM.
The safety switch is for maintenance. It disconnects the battery from the circuit to the squib.
The mode select switch is part of the mode select mechanism. The mode select handle sets the mechanism to the AUTO or MANUAL mode. When the handle is in the AUTO position, the mode select switch is in the AUTO position. This arms the system.
The door open switch goes to the OPEN position when the door handle moves to the door full open position. Electrical power goes from the battery to the squib. The squib fires when it gets power.
Operation of the external door handle automatically moves the mode select handle to the MANUAL position. When the handle is in the MANUAL position, the mode select switch is in the MANUAL position.
Contacts in the door open switch and the mode select switch and the safety switch short the squib and prevent accidental ignition.
The position of the mode select switch goes to the AIMS to show on the door synoptic display. See the door warning system section for more information about door indications (SECTION 52-71).
EFFECTIVITY BEJ ALL  52-11-00 
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D633W101-BEJ  May 05/2003 

 

PASSENGER ENTRY DOOR -EMERGENCY POWER ASSIST SYSTEM (EPAS) -FUNCTIONAL DESCRIPTION

EFFECTIVITY BEJ ALL  52-11-00 
Page 49 
D633W101-BEJ  May 05/2003 

 

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

52-11-00

Page 50 D633W101-BEJ Sep 05/2002

PASSENGER ENTRY DOOR SYSTEM -FUNCTIONAL DESCRIPTION

Flight Lock Disengage
Airplane airspeed below 80 knots removes electric power from the flight lock. The flight lock releases the latch mechanism.
Disarm
Forward movement of the mode select handle opens the mode select switch so that the emergency power assist system (EPAS) can not operate. It also pulls the push/pull cable. This unlocks the girt bar from the floor fitting and locks it to the girt bar mechanism on the door.
Unlatch
When you pull the external handle out, it pulls a cable that moves the mode select lever to the disarm position. When you pull the external handle outward, it connects with the internal handle.
When you turn the handle 180 degrees in the open direction, the initial movement of either door handle releases the vent door. The vent door opens if the airplane is sufficiently depressurized. The interlock rod pushes down on the interlock roller arm. The interlock roller releases the interlock cam on the latch torque tube.
EFFECTIVITY BEJ ALL
The latch torque tube turns the latch cranks. The cranks push down on the latch tracks (not shown). The secondary lift pushes up on the door attach fitting and lifts the door. The girt bar mechanism interlock turns to stop movement of the mode select handle and girt bar mechanism.
Open
BEJ 008-999; BEJ 001-007 POST SB 777-52-0031
The latch crank rollers move out of the latch tracks. The latch crank interlock locks the cranks.
BEJ 001-007 PRE SB 777-52-0031
The latch crank rollers move out of the latch tracks.
BEJ ALL
The door translates open on the hinge. The programming chain keeps the door parallel to the fuselage. The snubber controls the rate of door movement.
When the door is completely open the hold open hook engages the hold open catch.
Close
When you pull on the hold open handle (not shown), the hold open hook releases and the door moves aft.
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Page 51 D633W101-BEJ May 05/2003

PASSENGER ENTRY DOOR SYSTEM -FUNCTIONAL DESCRIPTION

BEJ 008-999; BEJ 001-007 POST SB 777-52-0031
Either the external or internal handle closes the door. The aft latch track pushes the latch crank interlock up. The secondary lift and latch cranks lower the door into the plug position inboard of the cutout stops (not shown). The drive rod pushes the vent door closed.
　
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