Garmin GPS 400W Installation Manual page 117

5.5.6.3 Sandel SN3500 Interface Check
IF a Sandel SN3500 EHSI has been connected to a 400W Series unit, the interface should be verified as
follows:
1. Cycle power to the 400W Series unit and acknowledge the prompts until it gets to the self test
page (see Section 5.5.1).
2. Ensure that the SN3500 is receiving valid heading.
The Vertical Deviation Indication will not be displayed unless the SN3500 is receiving
valid heading.
3. While the 400W Series unit is displaying the self test page, verify that the SN3500 is displaying
data from the GPS source.
Course Deviation: Half-scale left deviation, TO indication, flag pulled
Vertical Deviation: Half-scale up deviation, flag pulled
Active Waypoint: GARMN
If the Vertical Deviation Indication is not displayed ensure that the Main ARINC 429
Config (See Section 5.3.1) is set to Enable Labels for VNAV.
4. On the 400W Series unit verify that an OBS value is displayed (and not dashed out).
5. Acknowledge the self test on the 400W Series unit by pressing the ENT key.
6. Select VLOC on the 400W Series unit and verify that the SN3308 displays NAV 1 or
NAV 2 (depending on what navigation source the 430W is).
7. Ensure that the NAV1 (or NAV2) indication does not have a red line through it.
5.5.6.4 EHSI Deviation Scaling (If HSI/CDI Is Driven by the 400W Series Unit Via Serial
Data)
If the 400W Series unit has a serial connection to an EFIS display, proper scaling of the EFIS CDI and
VDI must be verified.
1. Cycle power to the 400W Series unit and acknowledge the prompts until it gets to the self test
page (see Section 5.5.1).
2. With the self test page displayed on the 400W Series unit, look on the EHSI/EFIS and verify that
the lateral deviation is not flagged and half-scale left.
3. With the self test page displayed on the 400W Series unit, look on the EHSI/EFIS and verify that
the vertical deviation is not flagged and half-scale up.
If the deviations are not as described, the EHSI/EFIS does not scale the 400W Series unit
deviations properly and cannot be certified for GPS-based guidance. Contact Garmin for
further assistance.
GNS 400W Series Installation Manual
190-00356-08
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