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MD41-438, Model MD41 Annunciation Control Unit – 28V, Garmin GPS 155/165, Vertical



MD41-438, Model MD41 Annunciation Control Unit – 28V, Garmin GPS 155/165, Vertical

MD41-438 Description

The MD41-438 is a self -contained GPS Annunciation and also Control unit. It combines all the necessary functions required for switching HSI/CDI data inputs between a conventional VOR receiver and also the Garmin GPS 155/165 approach-certified GPS receiver. In addition, the MD41-438 contains several GPS status annunciations used to indicate modes selected by the front panel switches and various inputs from the GPS receiver

Other features include dual, 16,000-hour lamps used for all annunciations, internally lighted selection switches, automatic photocell dimming, and also built-in annunciation self-test. Lastly, An external annunciation dimming adjustment is provided for balancing low-level light conditions.


Mounting: Panel

TSO Compliance: TSO C129

Applicable Documents: RTCA DO-160C, DO-208

Operating Temperature Range: -55 to +70°C

Humidity: 95% Non-Condensin

Altitude Range: 0 to 55,000

Vibration: Cat. M and also N

Lastly, Operational Shock: Rigid Mounting, 6 G Operational (15 G Crash Safe)


  • Interface and annunciation device that combines navigation source switching to pilot’s primary CDI or HSI with key GPS selection and also annunciation functions
  • Transfers Navigation display between VOR/LOC and also approach certified GPS systems
  • Provides up to 19 user-defined relay poles
  • TSO C129 Approved to meet NEW FAA field approval requirements
  • Lighted push buttons and also daylight readable annunciators
  • Instrument lighting rheostat controls push-button lighting level
  • Annunciator lighting is automatically dimmed by means of a photocell feedback circuit
  • Available in Horizontal or Vertical configuration
  • 28 Volt lighting
  • Available for most GPS manufacturers

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