SA4550 4-ATI Primary Attitude Display

SA4550 4-ATI Primary Attitude Display

The SA4550 Primary Attitude Display upgrades electromechanical ADIs to an LED-backlit display with pilot configurable single or dual-cue flight director command bars, and a glideslope/localizer deviation scale. These convenience features include a fast/slow indicator and mode annunciations to make flying easier and safer. A pilot-selectable single-cue/split-cue display option is also available. For ease of installation, it is plug compatible with various Sperry, Collins and King indicators. The SA4550 accepts input from existing sensors to provide a clear, reliable depiction of the aircraft’s attitude in pitch and roll. Along with patented bright, high-contrast display―the same technology used in military aircraft―you get unmatched readability in any lighting, while eliminating the high maintenance costs and potential for failure associated with older electromechanical units.

Product Images

Operational & Functional Benefits

  • Bright, high-resolution, sunlight-readable LED-backlit displays
  • 180-degree vertical and lateral viewing angle
  • FAA approved for primary flight display
  • Compatible with 4-in., 4×5-in., and 5-in. panel cutouts
  • >10,000 hour MTBF
  • Night Vision option available

Product Support

SA4550 Software Version History


A1.10 – Released 11/21/2023
  • Add configuration option to display Rad Alt and MINS Readout in Feet or Meters.
A1.09 – Released 7/17/2015
  • For MOD A units only (Serial numbers 10-3136 and above).
1.10 – Released 11/21/2023
  • Add configuration option to display Rad Alt and MINS Readout in Feet or Meters
1.09 – Released 11/6/2013
  • Added support for optional ARINC 429 attitude and radar altimeter interface.
1.07 – Released 3/14/2011
  • Corrects possibility of display blanking.
1.06 – Released 10/31/2008
  • Corrects radar altimeter selection input pins.
  • Added support for NVIS operation.
1.05 – Released 7/15/2008
  • Added support King KCI 310 models.
1.04 – Released 2/27/2008
  • Added support for Collins models.
1.03 – Released 10/16/2007
  • Corrected the flight director out of view operation and dual-cue flight director pitch scaling for SA4550-0xx part numbers.
1.02 – Released 8/30/2007
  • Corrects pin out for radar altimeter type selection.
  • Maintenance page text enhancements.
1.01 – Released 6/29/2007
  • Commercial release.

SIL 4550-07: Software version 1.09 for ARINC 429 interface option – 11/13/2013

SIL 4550-06: Hardware modification to prevent excessive vibration of slip/skid ball – 6/13/2013
SB 4550-05: Software version 1.07 – 3/14/2011
SB 4550-04: Display discoloration – 8/20/2009
SB 4550-03: Software version 1.06 – 10/31/2008
SB 4550-02: Attitude and radar altimeter test drive output drive current – 8/30/2007
SIL 4550-01: Software version 1.02 – 8/30/2007

SA4550 Software Update Access