777 AIRCRAFT MAINTENANCE MANUAL
GPWS -STATUS LEDS
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GPWS -GROUND TESTS
General
You do an operational test of the GPWS from the MAT.
Operational Test
The operational test makes sure the ground proximity warning system operates correctly.
You get these indications when you do an operational test:
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All the GPWS aurals
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The master warning lights come on
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PULL UP and WINDSHEAR messages show on the PFDs
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The ground proximity light comes on.
Training Information Point
If you do not hear all the GPWS aurals and see the master warning lights come on, PFD messages show, and the ground proximity light come on, the operational test failed.
During the test, these aurals do not come on:
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ENGINE FAIL
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V1.
This test is the same as the self test-level 1.
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777 AIRCRAFT MAINTENANCE MANUAL
GPWS -GROUND TESTS
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777 AIRCRAFT MAINTENANCE MANUAL
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VHF OMNIDIRECTIONAL RANGING (VOR) SYSTEM
Purpose
The VHF omnidirectional ranging (VOR) system is a navigation aid that gives magnetic bearing data from a VOR ground station to the airplane.
Description
The VOR ground stations transmit an omnidirectional signal and directional signal. Together the signals give magnetic radial information from 000 degrees to 359 degrees. All VOR stations reference the 000 degree to magnetic north.
The VOR system receives the ground station signals and calculates bearing data. The data goes to various systems for display and navigation use.
The VOR system supplies station audio and identifier signals to the flight deck speakers and headsets.
Abbreviations and Acronyms
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ACP -audio control panel
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AIMS -airplane information management system
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ALTN -alternate
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ARINC -aeronautical radio, inc.
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ATE -automatic test equipment
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auto -automatic
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BITE -built-in test equipment
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CDU -control display unit
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CMCF -central maintenance computing function
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CMCS -central maintenance computing system
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EFIS -electronic flight instrument system
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FMCF -flight management computing function
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LED -light emitting diode
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MHz -megahertz
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NCD -no computed data
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RF -radio frequency
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VHF -very high frequency
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VOR -VHF omnidirectional ranging
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VHF OMNIDIRECTIONAL RANGING (VOR) SYSTEM
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VOR -GENERAL DESCRIPTION
General
The VOR system has two VOR/marker beacon (MB) receivers. The receivers have both VOR and marker beacon functions. This section covers only the VOR operation of the VOR/MB receiver. The VOR receivers get RF inputs from one VOR antenna on the vertical stabilizer.
Description
The receivers get manual tune inputs from the left or right CDU or autotune inputs from the airplane information management system (AIMS) cabinets. Manual or autotune inputs both go through the AIMS cabinets, then to the VOR receivers.
The VOR receivers can get tune inputs directly from the left or right CDU (alternate tune) if the tune inputs from the AIMS cabinets fail.
RF signals from the VOR antenna go through power dividers, then to the VOR receivers. The VOR receivers use the RF signals to calculate station bearing and to decode the Morse code station identifier signal.
The receivers get discretes from the air/ground relays.
The receivers send VOR bearing data to the AIMS cabinets to show on the navigation displays (NDs).
The VOR/MB receivers send station audio and identifier signals to the audio management unit (AMU).
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VOR -GENERAL DESCRIPTION
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VOR -FLIGHT DECK COMPONENT LOCATION
