ADIRS -FAULT REPORT AND SOFTWARE DATA LOAD
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STANDBY MAGNETIC COMPASS
Purpose
The standby magnetic compass is a backup magnetic heading reference.
Location
The standby magnetic compass is below the overhead panel (P5).
Power
The standby magnetic compass has a 5v ac light bulb. A lamp access cover permits replacement of the bulb.
Characteristics
The standby magnetic compass has a circular heading indicator card. The card floats in a case filled with liquid. The liquid does not permit the card to move quickly.
There are two magnets in the standby magnetic compass. The magnets are parallel to each other, and they are in the horizontal plane. The magnets align the compass with the magnetic flux lines of the earth.
Adjustment
The standby magnetic compass has N-S (north-south) and E-W (east-west) compensation screws. These screws change the position of the magnets.
Use the compensation screws to correct for magnetic deviations generated by electrical currents in the flight deck. Use only non-magnetic tools to turn the compensation screws.
There is a compass correction card below the compass. Use this card to write small errors that the compensation screws cannot remove.
Removal/Installation
Four screws hold the standby magnetic compass in place. Use only non-magnetic tools and screws to remove and install the standby magnetic compass.
You must do a compass swing after you replace the standby magnetic compass.
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ILS -INTRODUCTION
Purpose * VOR -VHF omnidirectional ranging
The multi-mode receiver (MMR) has these functions:
*
Instrument landing system (ILS) function
*
Global positioning system (GPS) function.
The ILS function provides lateral and vertical guidance to the runway on approach. The system uses signals from a glideslope ground station and a localizer ground station.
The glideslope station transmits signals to give the airplane a descent path to the touchdown point on the runway. The localizer station transmits signals to give a lateral path to keep the airplane centered on the runway.
The ILS system provides station audio and identifier signals to the flight interphone speakers and the headsets.
Abbreviations and Acronyms
*
ACP -audio control panel
*
AFDS -autopilot flight director system
*
AIMS -airplane information management system
*
AMU -audio management unit
*
CDU -control display unit
*
CMCS -central maintenance computing system
*
GPWC -ground proximity warning computer
*
ILS -instrument landing system
*
MMR -multi-mode receiver
*
ND -navigation display
*
PFD -primary flight display
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ILS -GENERAL DESCRIPTION
General
The instrument landing system (ILS) has three multi-mode receivers (MMRs). The ILS system uses inputs from these antennas:
*
VOR antenna
*
Localizer antennas
*
Glideslope capture antennas
*
Glideslope track antennas.
Description
The antenna inputs go through localizer and glideslope antenna switches, then to the MMRs.
The receivers get manual tune inputs from the left or right CDU, or autotune inputs from the airplane information management system (AIMS) cabinets. The receivers get tune inputs directly from the left or right CDU (alternate tune) if the tune inputs from AIMS fails.
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