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Barometric correction adjusts the barometric altitude value that
shows on the altimeter indication. This adjusts for changes in
barometric pressure.
Barometric Correction Controls
The barometric correction controls are on the EFIS control
panels. The controls select and set barometric correction
reference, values, and displays. These are the barometric
controls:
* Barometric reference selector - selects inches of mercury
(IN) or hectopascals (HPA) as the barometric reference
* Barometric correction selector - sets the value of barometric
correction
* Barometric standard (STD) switch - push the switch to set the
barometric standard to 29.92 in hg, 1013 hPa.
Barometric Correction Display
Barometric correction shows on the PFD below the altitude
tape. The barometric correction shows in hg or hPa. The EFIS
control panel barometric reference selector determines the
format that shows.
Push the STD switch to show standard barometric correction.
When the barometric altitude of the airplane is at or below the
FMC transition altitude plus 300 feet, a yellow boxed STD
replaces the standard barometric correction value.
When you set a new barometric correction value and STD is
active, the new value will show below the STD value. Push the
STD switch to remove the STD value and make the new value
active.
ADIRS - BAROMETRIC CORRECTION INDICATION
EFFECTIVITY
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ADIRS - BAROMETRIC CORRECTION INDICATION
ADIRS - BAROMETRIC CORRECTION INDICATION
EFFECTIVITY
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General
Total air temperature (TAT) from the ADIRUs shows on the top
of the engine display. The TAT value that shows is from the left
ADIRU. When the left ADIRU TAT is invalid, the right ADIRU TAT
value shows. TAT goes out of view when the data from both
ADIRUs is invalid.
ADIRS - TAT INDICATION
EFFECTIVITY
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ADIRS - TAT INDICATION
ADIRS - TAT INDICATION
EFFECTIVITY
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General
The ADIRS alignment time will change between a minimum of 5
minutes at the equator to 17 minutes maximum at 78.25
degrees, north or south latitudes.
The alignment time will not be more than 10 minutes if the
present position latitude is between 60.0 degrees north or
south. The alignment time is fixed at 10 minutes between
latitudes of 60.0 and 70.2 degrees north or south. The alignment
time is fixed at 17 minutes between latitudes of 70.2 and 78.25
degrees north or south.
The ADIRU will not align at a latitude more than 78.25 north or
south.
ADIRS - ALIGNMENT PROCEDURE 1
EFFECTIVITY
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ADIRS - ALIGNMENT PROCEDURE 1
ADIRS - ALIGNMENT PROCEDURE 1
EFFECTIVITY
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Alignment Mode
CAUTION: SOME SWITCHES MUST BE PULLED AND THEN
TURNED. IF YOU TRY TO TURN THESE SWITCHES
BEFORE YOU PULL THEM, YOU CAN DAMAGE
THE SWITCH.
Use the mode selector on the MSU to start the ADIRU
alignment. Move the selector from OFF to NAV. The left
selector controls the left ADIRU and the right selector controls
the right ADIRU.
The ON DC light comes on for 5 seconds. During this time, the
ADIRU does a check of its dc power source. After 5 seconds, the
ON DC light goes off and the ALIGN light comes on. The ADIRU
is now in the alignment mode.
Training Information Point
If the ADIRU detects airplane movement during the alignment
mode, the alignment process will stop. After the motion stops, a
　
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