EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 42-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
5.6.3 GPSS
GPS Steering provides a steering command to the autopilot through the HDG Datum
channel to provide for enroute, procedure turn, holding pattern, and turn anticipation
operation. GPSS through the EFD1000 is only available if Label 121 is transmitted by
the GPS over the ARINC 429 bus. RS-232 interfaces do not provide label 121;
therefore, for RS-232 GPS systems GPSS functionality is not provided.
5.6.4 GPS/ NAV Switching
Existing GPS/NAV switching from the GPS and VLOC receiver to the original HSI will be
removed as the PFD will provide this capability. The existing GPS and VLOC receivers
will be wired directly to the PFD or ACU(s) as per the installation drawings in Section 9.
Any analog connections from the GPS and/or VLOC receiver to the autopilot will be
removed and wired per the ACU to autopilot interfaces shown in Section 9.
5.6.5 Sonalert
A Sonalert may be installed to provide an audio tone to the pilot whenever an altitude
or minimums advisory is generated by the system.
5.6.6 Heading Output
It may be necessary to use a digital bus, in lieu of a synchro output, to supply an
external device such as a TCAS or Stormscope system with heading. Label 320 is
output from the ACU on P3 pins 4 & 5 via a low speed ARINC 429 bus, if no ACU is
installed then label 320 is available from the PFD pins 26 and 27.
Figure 5.4 – Low Speed ARINC 429 Heading
To Next Page
Loading...
