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During the first two seconds of the test, the receiver output goes
to a fail condition. The pointer goes out of view and the amber
ADF flag shows momentarily.
For the next two seconds, the receiver output goes to an NCD
condition. During this time, the amber ADF flag goes out of view
and the pointer stays out of view.
Next, the test display shows and the pointer goes to a test
position of 135 degrees from the heading lubber line until the
end of test.
NOTE: The graphic shows a test of ADF receiver 1. For a dual
system, the test is the same for ADF receiver 2.
ADF SYSTEM - SELF-TEST
EFFECTIVITY
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ADF SYSTEM - SELF-TEST
ADF SYSTEM - SELF-TEST
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The global positioning system (GPS) uses navigation satellites
to supply airplane position to airplane systems and to the flight
crew.
Abbreviations and Acronyms
* ADIRU - air data inertial reference unit
* AMP - amplifier
* APU - auxiliary power unit
* ARINC - Aeronautical Radio, Inc.
* ATT - attitude
* A/D - analog to digital
* BITE - built-in test equipment
* CDU - control display unit
* CONV - convertor
* dc - direct current
* DET - detection
* D/A - digital to analog
* ELEC - electrical
* flt - flight
* FMC - flight management computer
* GP - general purpose
* GPS - global positioning system
* HEX - hexadecimal
* IRS - inertial reference system
* L - left
* LBL - left buttock line
* MMR - multi mode receiver
* nav - navigation
* NCD - no computed data
* NVM - non volatile memory
* ovht - overheat
* pos - position
* PPS - precision positioning service
* R - right
* RAIM - receiver autonomous integrity monitor
* RBL - right buttock line
* rcvr - receiver
* RF - radio frequency
* SAT - satellite
* SCR - silicon controlled rectifier
* SPS - standard positioning service
* SS - single shot
* sta - station
* UTC - universal time (coordinated)
* tBIAS - clock bias
* V - volts
* WL - water line
GLOBAL POSITIONING SYSTEM - INTRODUCTION
EFFECTIVITY
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GLOBAL POSITIONING SYSTEM - INTRODUCTION
GLOBAL POSITIONING SYSTEM - INTRODUCTION
EFFECTIVITY
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General
The global positioning system (GPS) calculates this data:
* Latitude
* Longitude
* Altitude
* Accurate time
* Ground speed.
There are two GPS systems. Antenna 1 receives satellite
signals and sends them to multi mode receiver (MMR) 1.
Antenna 2 connects to MMR 2. The MMRs calculate the airplane
position and accurate time. This data goes to the flight
management computer system (FMCS) and the IRS master
caution unit. The FMCS uses GPS or navigation radio position
with inertial reference data to calculate the airplane position.
The ADIRU sends position data to the MMRs.
The IRS master caution unit gets GPS data from both MMRs. It
causes the GPS fail light on the IRS mode select unit to come on
when the two units have a failure or if one unit fails and the
master caution annunciator is pushed.
The ground proximity warning computer gets GPS position and
velocity data from the MMRs.
The clock gets GPS time and date from the MMRs.
GPS - GENERAL DESCRIPTION
EFFECTIVITY
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GPS - GENERAL DESCRIPTION
GPS - GENERAL DESCRIPTION
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