Training Information Point
All of the lights in the ceiling of the cargo compartments are the same. To get access to the lamp you pull out the grill. There is a lanyard that holds the grill.
The light will not operate if the grill is not in position.
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LOWER LOBE CARGO COMPARTMENT LIGHTS -COMPARTMENT LIGHTS

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LOWER LOBE CARGO COMPARTMENT LIGHTS -OPERATION

Forward Cargo Compartment Lights
You use the cargo lights switch (INTERNAL) on the P43 forward door control panel or the switch near the P35 forward cargo handling accessory panel to operate the lights. The P35 panel is inside the forward cargo door.
The lights also come on when the door between the main equipment center and the forward cargo compartment is open.
Aft and Bulk Cargo Compartment Lights
You use these switches to operate the aft and bulk cargo compartment lights:
*
INTERNAL cargo lights switch on the P44 aft cargo door control panel (not shown)

*
Switch on the internal control panel inside the aft cargo compartment door, near the P39 aft cargo handling accessory panel (not shown)

*
Switch on the internal control panel inside the bulk cargo compartment door opening (not shown).

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LOWER LOBE CARGO COMPARTMENT LIGHTS -OPERATION

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LOWER LOBE CARGO COMPARTMENT LIGHTS -FUNCTIONAL DESCRIPTION -FORWARD CARGO COMPARTMENT

General
The 28v dc ground handling bus gives power to two relays in the P35 panel. The relays control operation of the forward cargo interior lights. Power to operate the lights comes from the 115v ac ground handling bus. A transformer in the P35 panel reduces the 115 volts to 28 volts.
Functional Description
When the forward interior cargo lights relay energizes, power from the transformer goes to the lights. Two conditions can energize the relay:
*
The door between the cargo compartment and the main equipment center (E/E DR) is open

*
The cargo door is not in latch range and there is a complete circuit through the two interior cargo lights switches.

See the forward large cargo door section for more information about the latch range proximity sensor (SECTION 52-34).
Each light has a microswitch that removes power from the light if the grille is not in place.
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LOWER LOBE CARGO COMPARTMENT LIGHTS -FUNCTIONAL DESCRIPTION -FORWARD CARGO COMPARTMENT

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LOWER LOBE CARGO COMPARTMENT LIGHTS -FUNCTIONAL DESCRIPTION -AFT & BULK CARGO COMPARTMENT

General
The 28v dc ground handling bus gives power to two relays in the P39 panel. The relays control operation of the aft and bulk interior cargo lights. Power to operate the lights comes from the 115v ac ground handling bus. A transformer in the P39 panel decreases the 115 volts to 28 volts.
Functional Description
When the aft interior cargo lights relay energizes, power from the transformer goes to the lights. When you position the three light switches to give continuity, one of these conditions can energize the cargo lights relay:
*
The bulk cargo door closed, latched and locked switch is in the open position

*
The aft cargo door is lifted.

See the door warning system section for more information about the bulk cargo door switch (SECTION 52-71).
See the aft small cargo door section for more information about the door lifted proximity sensor (SECTION 52-35).
Each light has a micro switch that removes power from the light if the grille is not in place.
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LOWER LOBE CARGO COMPARTMENT LIGHTS -FUNCTIONAL DESCRIPTION -AFT & BULK CARGO COMPARTMENT

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777 AIRCRAFT MAINTENANCE MANUAL

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EXTERIOR LIGHTS -INTRODUCTION

Purpose
The exterior lights give light to make the airplane more visible and to aid in safe operation of the airplane.
　
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