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Mid-Continent Relay, GPS Switching, 28V

Includes:

  • Relay, GPS Switching, 28V – Unit Only

 

Product Photographs Disclaimer: Stock photographs do not show the actual product for sale. While Pacific Avionics makes its best effort to ensure all products are of good repair, photos of the item for sale are available on request.

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Part NumberDescriptionConditionPriceAvailabilityStockOrder Qty 
MD41-248Mid-Continent Relay, GPS Switching, 28VAR$455.00In stock2
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Serial Number: 12350 - In Stock    

     

  • Product Condition: Serviceable when removed (AR)
  • Notes: This unit has been removed serviceable from the aircraft and it was in working condition at that time. For sale is the unit only. Please contact us if you require any further details or assistance sourcing similar parts.
Serial Number: 13559 - In Stock    

     

  • Product Condition: Serviceable when removed (AR)
  • Notes: This unit has been removed serviceable from the aircraft and it was in working condition at that time. For sale is the unit only. Please contact us if you require any further details or assistance sourcing similar parts.
    

 

Features

  • The MD41-244/248 is a bulkhead mounted remote transfer relay unit specifically designed for switching a CDI or HSI Indicator between two aircraft radio navigation systems.
  • The remote switching unit is designed to be used with the companion MD41-1XXX series Annunciation Control Unit (ACU).
  • This pertains to GPS systems where the user desires to share a common CDI or HSI between an existing NAV system and a GPS system.
  • The 24 pole unit features eight relay pairs consisting of 3 poles per relay pair.
  • Each relay pair can be activated individually by either voltage or ground keying or as a group by ground keying.

 

Other design features include: 

  • Interlocking of transfer relays utilizing one pole per relay pair for failure monitoring.
    • (This feature provides indication that all relays have power applied to their activating coils. It does not monitor all relay contacts or coils.) 
  • A special ILS override that will automatically force the MD41-244/248 to switch to NAV mode when the NAV (VOR) receiver is tuned to an ILS frequency (optional connection). 
  • An adjustable dimming regulator is included to provide dimmed voltage to an external annunciation (750ma max).

PHYSICAL CHARACTERISTICS

Mounting:

  • Bulkhead Width: 2.86 Inches
  • Height: 1.52 Inches
  • Depth: 2.60 Inches
  • Weight: 0.75 lbs.

 

ENVIRONMENTAL CHARACTERISTICS

TSO Compliance

  • TSO C129 Applicable documents: RTCA DO-160C, DO-208
  • Operating temperature range: -55C to +70C
  • Humidity: 95% non-condensing
  • Altitude range: 0 to 55,000 ft.
  • Vibration: Cat. M and N Operational shock:
  • Rigid mounting, 6 G operational 15 G crash safety

 

INTERFACE ILS

  • Override Receives a logic low from the NAV (VOR) J1 Pin 16 receiver when tuned to an ILS frequency.
  • This will force the MD41-244/248 into NAV mode, regardless of the NAV/GPS selection.
  • This connection is optional. Dimming Output Provides an adjustable dim voltage to be used J2 Pin 33 with a remote mounted annunciation unit. 750 ma max. GPS annunciation Pins 16 and 17 will short together when all interlock transfer relays are energized.
  • This can J2 Pins16 and 17 be used to complete the GPS annunciation circuit to monitor that power has been applied to each relay coil.

 

  • MD41-248 Remote Relay unit only, no mounting hardware or connector kit.

All used avionics sold by Pacific Avionics comes with 90 days warranty. For more information, please visit our Terms & Conditions page.

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Serial Number: 12350 – In Stock    

     

  • Product Condition: Serviceable when removed (AR)
  • Notes: This unit has been removed serviceable from the aircraft and it was in working condition at that time. For sale is the unit only. Please contact us if you require any further details or assistance sourcing similar parts.
Serial Number: 13559 – In Stock    

     

  • Product Condition: Serviceable when removed (AR)
  • Notes: This unit has been removed serviceable from the aircraft and it was in working condition at that time. For sale is the unit only. Please contact us if you require any further details or assistance sourcing similar parts.
    

 

Features

  • The MD41-244/248 is a bulkhead mounted remote transfer relay unit specifically designed for switching a CDI or HSI Indicator between two aircraft radio navigation systems.
  • The remote switching unit is designed to be used with the companion MD41-1XXX series Annunciation Control Unit (ACU).
  • This pertains to GPS systems where the user desires to share a common CDI or HSI between an existing NAV system and a GPS system.
  • The 24 pole unit features eight relay pairs consisting of 3 poles per relay pair.
  • Each relay pair can be activated individually by either voltage or ground keying or as a group by ground keying.

 

Other design features include: 

  • Interlocking of transfer relays utilizing one pole per relay pair for failure monitoring.
    • (This feature provides indication that all relays have power applied to their activating coils. It does not monitor all relay contacts or coils.) 
  • A special ILS override that will automatically force the MD41-244/248 to switch to NAV mode when the NAV (VOR) receiver is tuned to an ILS frequency (optional connection). 
  • An adjustable dimming regulator is included to provide dimmed voltage to an external annunciation (750ma max).