Page 2-4 GPS 155XL/GNC300 XL Installation Manual
Revision F 190-00067-22
2.6 MINIMUM INSTALLATION REQUIREMENTS
The following is a list of required devices for A1 and A2 certification. For a specific list of equipment
used in the initial STC, see GPN 190-00067-26 for the GPS 155XL and GPN 190-00067-36 for the GNC
300XL. Deviations from this equipment should be approved by the FAA or the governing organization.
• Pressure Altitude Device—This device delivers pressure altitude data to the GPS 155XL/GNC
300XL. This data comes from an encoder or altitude data digitizer.
• Manual Course Device—This device delivers the manual course selected to the GPS
155XL/GNC 300XL. Course information can come from an analog resolver or from an EFIS via
the ARINC 429 bus.
• HSI/CDI Device—This device displays Nav Flag, Left/Right, and To/From information. This
can be displayed on the EFIS, HSI or CDI.
• External Annunciators and Switches:
• NAV Annunciator
• GPS Annunciator
• NAV/GPS Switch
• HOLD Annunciator
• AUTO Annunciator
• GPS Sequence Switch
• Approach Active Annunciator (not required for A2)
• Approach Arm Annunciator (not required for A2)
• GPS Approach Switch (not required for A2)
• Message Annunciator
• Arrival Annunciator
The installer is advised to ensure that the switches and annunciators are the functional equivalent to and
perform at least as well as the Garmin devices used in the initial STC. The Garmin switches and
annunciators are sunlight readable and in the primary view of the pilot. Figure 2-2 shows what the
Garmin switch/annunciators look like. For other information concerning switch/annunciators see the
Generic Airplane Flight Manual Supplement (GPN 190-00067-24 for the GPS 155XL and GPN
190-00067-34 for the GNC 300XL) as well as current FAA directives.
• Qualified GPS Antenna—This antenna must be one of those listed in the accessories list.
2.7 EXTERNAL ALTITUDE INPUT
Pressure altitude input from an external source may be derived from a RS-232 compatible serial altitude
input or Parallel Gray Code/Gillham Altitude as described in Section 4 of this manual. Gillham Altitude
is not required when serial altitude is used.
Figure 2-2. Switch/Annunciator Layout
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