NorthStar 1200-02-01, Installation Manual

Page: 28 / 56

Section Two—Installation Instructions
PAGE 24 M3 GPS INSTALLATION MANUAL Revision D
1. Turn the large secondary knob to
SETUP
.
2. Turn the small secondary knob to display:
3. Press
ACK
.
4. Rotate the small primary knob, if necessary, to precisely center the
deviation bar. When properly centered, press
ACK
.
5. The CDI should indicate five increments to the left. If necessary, to
achieve this, rotate the small primary knob, and then press
ACK
.
6. Check that the CDI indicates five increments right deflection. Rotate
the small primary knob to scan through the entire deviation range to
check its linearity and calibration accuracy. Compare the digital value
displayed by the M3 with the CDI’s reading. Turning this knob also
will test the Nav Flag, To/From Pointer, and External Annunciators.
Each knob click will activate one annunciator, as indicated on the
readout. Note that not all the annunciators that can be tested are nec-
essarily installed in your aircraft.
Setting the time
zone
The M3 contains a battery-powered clock that enables it to constantly
maintain the time and date, even when it’s turned off. The battery has a
design lifetime of 5 to 10 years. Time (according to
ZULU
time) and date
are normally set at the factory during final inspection. The installer may
leave the time zone set to
ZULU
or may set the time zone to local time, if
desired. Designating the time zone will automatically adjust the displayed
time to the correct offset from
ZULU
time.
The M3 automatically sets its internal clock to the date and time obtained
from the GPS system as soon as the time is available, after power has been
turned on, and the satellites have been acquired. This process occurs every
time the M3 is powered up and re-acquires GPS satellites.
NOTE:
If the unit has been designated as IFR-approved (by perform-
ing the procedure described in
“Enabling IFR operation”
beginning on page 25), this setting can be checked but not
changed. If it’s necessary to change this setting after the unit
has been designated as IFR-approved, the unit first must be
set back to VFR-only, and then returned to the IFR-enabled
mode after the setting has been changed.
CALIBRATE CDI,CK FLAGS,ANNCs.ACK?