Open
The PSEU uses inputs from the door lifted and door up sensors to enable the up relay. Either control switch in the OPEN position energizes the relay. The relay puts the power phases in the correct configuration so the hinge PDU opens the door to the full up position.
The PSEU uses inputs from the door up sensor to make the door up light come on.
Close
The PSEU uses inputs from the door lifted and door down sensors to enable the hinge down relay. Either control switch in the CLOSE position energizes the relay. The relay puts the power phases in the correct configuration so the hinge PDU closes the door to the full down position.
Latch
The PSEU uses inputs from the door down and door latched sensors to enable the lift/latch down relay. Either control switch in the CLOSE position energizes the relay. The relay puts the power phases in the correct configuration so the lift/latch power unit lowers the door to the latch (plug) position.
The PSEU uses inputs from the door down and door latched sensors to make the door latched light come on.
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AFT SMALL CARGO DOOR SYSTEM -ELECTRICAL FUNCTIONAL DESCRIPTION

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

BULK CARGO DOOR SYSTEM -INTRODUCTION

Purpose
The bulk cargo door system gives access to the bulk cargo compartment.
Location
The bulk cargo door is on the right side of the airplane, aft of the aft cargo door.
General Description
The bulk cargo door supplies a clear opening of 36 inches (91.4 cm) wide and 45 inches (114.3 cm) high. Door dimensions let cargo handlers load and unload cargo that is not on pallets or in containers.
The door is a plug type. To open, it hinges along the top and moves into the bulk cargo compartment area.
You operate it manually from outside or inside the bulk cargo compartment.
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BULK CARGO DOOR SYSTEM -INTRODUCTION

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BULK CARGO DOOR SYSTEM -COMPONENT LOCATIONS

Component Locations
The counterbalance mechanism is on the cargo compartment
ceiling structure, inboard of the bulk cargo door.
The snubber is at the top, center of the cargo door.
The two hinge arms are at the top of the cargo door.
The latch mechanism is across the door, near the bottom.

General Description
The latch mechanism lets you open and close the door. It also
holds the door closed.
The hinge arms let the door rotate open and closed.
The counterbalance lifts the door open.
The snubber controls the movement rate of the door.

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BULK CARGO DOOR SYSTEM -COMPONENT LOCATIONS

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BULK CARGO DOOR SYSTEM -DOOR AND SEAL

Purpose
The door and seal close and seal the external access to the bulk cargo compartment.
Physical Description
The door is a plug-type. It has a skin, frames, beams, guide rollers, and stops.
The seal is a blade-type that goes completely around the edge of the door.
Functional Description
The five stops on each side of the door pass the pressurization load on the door to stops on the door cutout.
　
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