Garmin GPS 155XL Installation Manual

Also see for GNC 300XL: Pilot's guide and reference Installation manual

Garmin GPS 155XL Installation Manual Manual pdf 16 page image

Page 2-4 GPS 155XL/GNC300 XL Installation ManualRevision F 190-00067-222.6 MINIMUM INSTALLATION REQUIREMENTSThe following is a list of required devices for A1 and A2 certification. For a specific list of equipmentused in the initial STC, see GPN 190-00067-26 for the GPS 155XL and GPN 190-00067-36 for the GNC300XL. 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/GNC300XL. This data comes from an encoder or altitude data digitizer.• Manual Course Device—This device delivers the manual course selected to the GPS155XL/GNC 300XL. Course information can come from an analog resolver or from an EFIS viathe ARINC 429 bus.• HSI/CDI Device—This device displays Nav Flag, Left/Right, and To/From information. Thiscan 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 AnnunciatorThe installer is advised to ensure that the switches and annunciators are the functional equivalent to andperform at least as well as the Garmin devices used in the initial STC. The Garmin switches andannunciators are sunlight readable and in the primary view of the pilot. Figure 2-2 shows what theGarmin switch/annunciators look like. For other information concerning switch/annunciators see theGeneric Airplane Flight Manual Supplement (GPN 190-00067-24 for the GPS 155XL and GPN190-00067-34 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 INPUTPressure altitude input from an external source may be derived from a RS-232 compatible serial altitudeinput or Parallel Gray Code/Gillham Altitude as described in Section 4 of this manual. Gillham Altitudeis not required when serial altitude is used.Figure 2-2. Switch/Annunciator Layout