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scratchpad. You do not need to use spaces or decimal
points (.)
* Push LSK 4R. Position data moves from the scratchpad to
the SET IRS POS boxes.
ADIRS - SCRATCHPAD PRESENT POSITION ENTRY
EFFECTIVITY
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GPS Position Transfer
Do this to transfer GPS position data from the POS REF page on
the CDU to the ADIRUs:
* Push the NEXT PAGE key on the CDU. The INIT REF page
changes to the POS REF page.
* Push LSK 4L, or LSK 5L. The GPS L or GPS R position data
moves to the scratchpad.
* Push the PREV PAGE key on the CDU. The POS REF page
changes to the INIT REF page. The GPS position data stays
in the scratchpad.
* Push LSK 4R. The GPS position data moves from the
scratchpad to the SET IRS POS boxes.
ADIRS - GPS PRESENT POSITION ENTRY
EFFECTIVITY
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ISDU Present Position Entry
You can use the ISDU keyboard to enter present position data
for the ADIRUs. The display selector (DSPL SEL) can not be in
TEST. You can enter latitude or longitude first.
Latitude Entry
Push the N2 or S8 key to enter latitude. The letter N or S shows
in the left IRS DISPLAY and the light on the ENT key comes on.
Push the keys to enter the latitude data. When you push each
key, the number appears at the far right of the left IRS DISPLAY.
Numbers entered before will shift one space to the left. Push the
ENT key to send the data to the ADIRUs. The light on the ENT
key goes off. If the display selector is in a position other than
PPOS, the IRS DISPLAY will change to the information that
showed before you started the position entry.
Longitude Entry
The longitude entry is similar to the latitude entry. Push the W4
or E6 key to enter longitude. The longitude data will show in the
right IRS DISPLAY.
Invalid Position Entry
These keyboard entries cause the CLR key light to come on
when you push the ENT key:
* Latitude greater than 90 degrees
* Longitude greater than 180 degrees
* Minute value greater than 59.9.
Push the CLR key to clear the invalid position entry.
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General
You can see the time remaining to alignment on the ISDU. Set
the DSPL SEL switch to the HDG/STS position. The right IRS
DISPLAY shows the time in minutes until the ADIRU is aligned.
For 17 minute alignments, 15 shows in the right IRS DISPLAY for
the first three minutes. After three minutes, the display counts
down to zero.
The ADIRU goes to the navigation mode at the end of the
alignment time if the mode select switch is in the NAV position
and present position has been entered.
ADIRS - ALIGNMENT TIME
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