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* Position shift (3/3).
You use the next and previous key to see all three position
pages. These are the pages that show GPS data:
* Position reference (POS REF)
* Position shift (POS SHIFT).
POS REF Page
The POS REF page shows GPS L (1) and R (2) positions.
POS SHIFT Page
The POS SHIFT page shows the GPS position from the flight
management computer (FMC) position. The GPS position
shows in these two parts divided by a slash (/):
* Bearing of the GPS position from the FMC position
* Distance of the GPS position from the FMC position in
nautical miles (NM).
Training Information Point
For all CDU displays that show GPS data, the displays refer to
GPS 1 as GPS L and GPS 2 as GPS R.
The POS SHIFT page does not show information in the data
fields when the airplane is on the ground.
GPS - CDU DISPLAYS
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GPS - CDU DISPLAYS
GPS - CDU DISPLAYS
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General
The GPS has continuous monitor BITE. These are the three
ways to detect GPS failures:
* When both GPS system 1 and GPS system 2 have failures,
the GPS fail light comes on.
* When you push a master caution annunciator and a GPS
system has a failure, the GPS fail light comes on.
* The FMC SENSOR STATUS page shows MMR failures. The
FMC SENSOR DATA page shows the internal failure in the
MMR.
GPS - TRAINING INFORMATION POINT - 1
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GPS - TRAINING INFORMATION POINT - 1
GPS - TRAINING INFORMATION POINT - 1
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General
These are the two pages that show GPS maintenance data:
* FMCS SENSOR STATUS page
* FMCS SENSOR DATA page.
FMCS SENSOR STATUS Page
The FMCS SENSOR STATUS page shows the status of the GPS
systems. It shows OK for systems that are valid and FAIL for a
GPS system that has failed.
To get access to the engineering data for the failures, type 100
in to the scratch pad and select line select key 6 right (LSK 6R).
FMCS SENSOR DATA Page
When GPS L (1) or GPS R (2) has a failure, the engineering data
will show. If both GPS systems are valid, no engineering data
for the GPS systems will show on this page.
This is the data that will show:
* System code
* Label code
* Fault state
* Failure time
* Monitor code.
GPS - TRAINING INFORMATION POINT - 2
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GPS - TRAINING INFORMATION POINT - 2
GPS - TRAINING INFORMATION POINT - 2
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Front Panel Self-Test
When you push the test switch, the MMR does a check of the
internal operation and its interface with the GPS antenna. The
test takes approximately 36 seconds. This is the test sequence
that shows on the status LEDs during the test:
* 0 to 2 seconds, the LRU STATUS and the CONTROL FAIL
LEDs are red
* 2 to 4 seconds, the LRU STATUS LED is green and the
CONTROL FAIL LED is red
* 4 to 6 seconds, all LEDs go off
* 6 to 36 seconds, test status shows.
NOTE: The ANT FAIL LED is not used at this time.
The LRU STATUS LED shows red when there is an internal
failure in the MMR. A green LED shows that the MMR is normal.
The CONTROL FAIL LED shows red when an interface to the
MMR has a failure.
GPS - MMR BITE
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