Part #: 822-1871-201

Model: AHC-1000A

Collins Aerospace - Attitude Heading Computer
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AHS-1000() AHRS System
  • Attitude Heading Reference Systems (AHRS)
  • AHS-1000() System is designed for Non-ARINC 429 equipped aircraft
  • Featuring digital quartz microelectromechanical systems (MEMS) sensors that provide heading and attitude information to the flight deck and other on board systems
  • Solid-state sensor technology for high reliability
  • Designed for both new aircraft and as replacement installations
  • Provides synchro and analog heading, attitude, rate and acceleration information
  • Automated compass swing
  • AHS-1000A replaces analog systems that use 6-wire flux detectors, such as the DGS-65
  • AHS-1000S replaces iron gyros that use 5-wire synchro flux detector interfaces
  • Operates in Basic Mode and requires No Air Data inputs
  • Compact Design - Reduced weight, size & power requirements
  • Mounts without a traditional mounting tray - choice of installing with or without provided mounting flanges
  • Easier installation through new auto-leveling feature
  • Configurable outputs for interface flexibility
  • Typical AHC-1000A systems include:
    • AHC-1000A Attitude Heading Computer,
    • FDU-3000* Flux Detector Unit, and
    • ECU-3000 External Compensation Unit
  • *In AHC-1000A System - FDU-3000 is not required for aircraft that already have FDU-70() installed
  • Typical AHC-1000S systems include:
    • AHC-1000S Attitude Heading Computer,
    • 323A-2G Flux Detector Unit (& ARINC standard 3 wire), and
    • ECU-3000 External Compensation Unit 


Weight: 4.60 lbs. Dimensions: 5.19" H x 3.5" W x 13.13" L w/flanges; 5.0"H x 2.5" W x 13.13" L w/out flanges
Temperature: -55°C to 70°C Altitude: 55,000ft
AHC-1000A Power Reqs: 28VDC, 27 W nom AHC-1000S Power Reqs: 28VDC, 25.5 W nom
Pitch: ±90° Roll: ±180°
Heading: ±180°  Body Rates: ±410°/s
Accelerations: ±15g    
Part NumberAHRS Computer Description:
822-1871-201 AHC-1000A (use w/FDU-3000 - replaces analog sys w/6-wire flux detectors)
822-1868-201 AHC-1000S (use w/5-wire flux detectors - replaces iron gyro sys)


- Attitude Heading Computer
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