584000
99
Zoom out
Zoom in
Previous page
1/124
Next page
400 SERIES INSTALLATION MANUAL Page 5-17
P/N 190-00140-02 Page Rev L
5.3.4 Deviation & Flags Check
5.3.4.1 Analog Deviation & Flags
The analog deviation (LEFT/RIGHT and UP/DOWN), TO/FROM, and FLAG (lateral and vertical) outputs
to a CDI or HSI should be verified in flight with potential sources of electrical noise such as autopilot,
flaps, gear, heater blowers, etc. operating. Lateral deviation and flags may be checked with either GPS or
VOR/ILS, and vertical deviation and flags must be checked with Glideslope. Verify that the flags are
hidden at the correct times, and that the flag is in view at the correct times.
5.3.4.2 EHSI Deviation Scaling (Only if HSI/CDI is driven by the 400 Series unit via serial data)
With the 400 Series unit locked onto a GPS fix, activate an OBS waypoint about 20 nautical miles from the
present position.
1. With 5.0 nautical mile CDI sensitivity, adjust the OBS course for approximately half-scale
deflection on the 400 Series unit’s Default Navigation page. Verify that the EHSI displays a
similar half-scale deviation.
2. Repeat step 1 with 1.0 nautical mile CDI sensitivity. The CDI sensitivity may be manually set on
the AUX SETUP page, using the “CDI / ALARMS” menu item.
3. Repeat step 1 with 0.3 nautical mile CDI sensitivity.
5.3.5 Crossfill Check (Only if dual units installed with RS-232 crossfill connected)
Turn on both 400 Series units in the aircraft. For each 400 Series unit:
1. Select the first AUX page (titled “FLIGHT PLANNING”).
2. Select “CROSSFILL”.
3. Verify that the displayed status is “Ready”. If “Not Available” is displayed, there may be an RS-
232 wiring problem between the two 400 Series units.
5.3.6 VHF COM Interference Check (GNC 420 and GNS 430 Only)
Once the Signal Acquisition Test has been completed successfully, perform the following steps:
1. View the Satellite Status Page and verify that 7 to 8 satellites have been acquired.
2. Verify that the GPS “NAV” flag is out of view.
3. Select 121.150 MHz on the 400 Series COM transceiver.
4. Transmit for a period of 20 seconds.
5. Verify that the GPS “NAV” flag does not come into view.
6. Repeat steps 4 and 5 for the following frequencies:
121.175 MHz
121.200 MHz
131.250 MHz
131.275 MHz
131.300 MHz
7. Repeat steps 3 through 6 for all COM transceivers installed in the aircraft.
8. If the GPS “NAV” flag comes into view, refer to Section 2.2.7 for options to improve performance.
99


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Garmin GNC 420 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Garmin GNC 420 in the language / languages: English as an attachment in your email.

The manual is 4,43 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info