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The relays supply three phase power in specified configurations to power units on the door. The phase configuration controls whether a power unit opens or closes the door.
There are internal and external control switches. The internal switch has priority over the external switch.
Unlock and Unlatch
A full open door lock handle enables door operation. The PSEU uses inputs from the handle unlocked sensor and door unlatched sensor to enable the door control relay. Either control switch in the OPEN position energizes the relay. The relay configures the power phases so the latch power unit unlatches the door.
Lift Movement
The PSEU uses input from the door unlatched sensor and door up sensor to enable the hinge up relay. Either control switch in the OPEN position energizes the relay. The relay configures the power phases so the lift power unit moves the door up. The PSEU uses input from the door up sensor to open the hinge up relay, and turn on the door up light.
Lower Movement
The PSEU uses input from the door unlatched sensor and latch range sensor to enable the hinge down relay. Either the external or internal control switch in the CLOSE position energizes the relay. The relay configures the power phases so the lift power unit lowers the door.
The PSEU uses input from the door up sensor to turn off the door up light.
The PSEU uses input from the latch range sensor to open the hinge down relay.
Latch and lock
The PSEU uses input from the latch range sensor and handle unlocked sensor to enable the door latch relay. Either control switch in the CLOSE position energizes the relay. The relay configures the power phases so the latch power unit pulls in and latches the door. The PSEU uses input from the door latched sensor to open the door latch relay.
The PSEU uses input from the latch range sensor, door latched sensor, and handle unlocked sensor to turn on the door latched closed light.
When the lock handle is closed, the PSEU uses inputs from the handle unlocked sensor to turn off the door latched closed light.
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FORWARD LARGE CARGO DOOR SYSTEM -ELECTRICAL FUNCTIONAL DESCRIPTION

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777 AIRCRAFT MAINTENANCE MANUAL

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

AFT SMALL CARGO DOOR SYSTEM -INTRODUCTION

Purpose
The aft small cargo door system gives access to the aft cargo compartment.
Location
The door is aft of the wing on the right side of the airplane.
General Description
The small cargo door supplies a clear opening of 70 inches
(177.8 cm) wide and 67 inches (170.2 cm) high. The dimensions of the door lets cargo handlers load and unload containers.
The door is a plug type. To open, it first moves up out of the plug position, then it opens outward and upward.
You can operate it electrically from inside or outside the cargo compartment. You can operate it manually from outside the cargo compartment.
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AFT SMALL CARGO DOOR SYSTEM -INTRODUCTION

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AFT SMALL CARGO DOOR SYSTEM -COMPONENT LOCATIONS -1

Components on the Door Cutout
The manual drive flexible shaft goes from the socket forward of the door to the hinge power drive unit (PDU).
The hinge PDU is on the top, center of the cargo door cutout.
The rotary actuators are forward and aft, along the top of the cargo door cutout. Torque tubes connect the hinge PDU to the actuators.
　
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