MD41328 MD41-328

Mid-Continent - Annunciator Control Unit
product image
Part Number :


MD41
FEATURES
  • Interface and annunciation device that combines navigation source switching to pilot's primary CDI or HSI with key GPS selection and annunciation functions
  • Transfers Navigation display between VOR/LOC and 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 daylight readable annunciators
  • Push-button lighting level is controlled by the instrument lighting rheostat
  • Annunciator lighting is automatically dimmed by means of a photocell feedback circuit
  • Available in Horizontal or Vertical configuration
  • Available with 5, 14, or 28 Volt lighting
  • Available for most GPS manufacturers (see table below)

 

SPECIFICATIONS
Dimensions (typical): 3.50"W x 1.350"H x 4.625"D Weight: 0.75 lbs.
RTCA: DO-160C, DO-208 Altitude: certified to 55000 ft.
Left-Right Meter: DC resistance: 1000 ohms +- 50 ohms Current Rating: zero center
Part NumberAnnunciator Control Unit Description:
MD41-324 14VDC, Horizontal Mount, For Use With KLN-90B
MD41-328 28VDC, Horizontal Mount, For Use With KLN-90B
MD41-3285V 5VDC, Horizontal Mount, For Use With KLN-90B
MD41-334 14VDC, Vertical Mount, For Use With KLN-90B
MD41-338 28VDC, Vertical Mount, For Use With KLN-90B
MD41-3385V 5VDC, Vertical Mount, For Use With KLN-90B
MD41-424 14VDC, Horizontal Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-01
MD41-428 28VDC, Horizontal Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-00
MD41-4285V 5VDC, Horizontal Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-02
MD41-434 14VDC, Vertical Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-06
MD41-438 28VDC, Vertical Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-05
MD41-4385V 5VDC, Vertical Mount, For Use With GPS-155/165- same as Garmin P/N 013-00029-07
MD41-444 14VDC, Horizontal Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-11
MD41-448 28VDC, Horizontal Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-10
MD41-4485V 5VDC, Horizontal Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-12
MD41-454 14VDC, Vertical Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-16
MD41-4585V 5VDC, Vertical Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-17
MD41-458 28VDC, Vertical Mount, For Use With GPS-155XL/GNC300/GNC300XL- same as Garmin P/N 013-00029-15
MD41-524 14VDC, Horizontal Mount, For Use With KLN-89B/KLN-94
MD41-528 28VDC, Horizontal Mount, For Use With KLN-89B/KLN-94
MD41-5285V 5VDC, Horizontal Mount, For Use With KLN-89B/KLN-94
MD41-534 14VDC, Vertical Mount, For Use With KLN-89B/KLN-94
MD41-538 28VDC, Vertical Mount, For Use With KLN-89B/KLN-94
MD41-624 14VDC, Horizontal Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-628 28VDC, Horizontal Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-6285V 5VDC, Horizontal Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-634 14VDC, Vertical Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-638 28VDC, Vertical Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-6385V 5VDC, Vertical Mount, For Use With Trimble 2000/2101 IFR GPS
MD41-724 14VDC, Horizontal Mount, For Use With Apollo/Garmin AT 2001/2101/GX50/GX60
MD41-728 28VDC, Horizontal Mount, For Use With Apollo/Garmin AT 2001/2101/GX50/GX60
MD41-734 14VDC, Vertical Mount, For Use With Apollo/Garmin AT 2001/2101/GX50/GX60
MD41-738 28VDC, Vertical Mount, For Use With Apollo/Garmin AT 2001/2101/GX50/GX60
MD41-824 14VDC, Horizontal Mount, For Use With Northstar M3
MD41-828 28VDC, Horizontal Mount, For Use With Northstar M3
MD41-834 14VDC, Vertical Mount, For Use With Northstar M3
MD41-838 28VDC, Vertical Mount, For Use With Northstar M3
MD41-9285V 5VDC, Horizontal Mount, For Use With KLN-900
MD41-928 28VDC, Horizontal Mount, For Use With KLN-900
MD41-9385V 5VDC, Vertical Mount, For Use With KLN-900
MD41-938 28VDC, Vertical Mount, For Use With KLN-900

 

MD41-328
- Annunciator Control Unit
Price Condition Delivery
$1,570.00 NEW OUTRIGHT CALL OR RFQ

SEA Repair Capabilities: No

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact questions@seaerospace.com

A normal Annunciator Control Unit (ACU) includes a control and relay assembly. The control portion includes lighted annunciations (words) as well as a switch assembly to activate a relay. The relay assembly provides the electrical transfer of information between a conventional nav (VOR/ILS/GS) and GPS to one Course Deviation Indicator (CDI).

The ACU units can be complete with control and relay built into one assembly or they can be separated depending on the part number. Some GPS systems and CDIs include internal relays. Therefore, only a control with switch is required. In this case, you would only purchase the Control Head. Some installations use different custom sizes and styles of annunciator switches. Therefore, in this case, only a remote relay is purchased without a control assembly.


In addition to variations in switches, relays, and sizes, ACUs are engineered to be compatible with specific GPS systems by different manufacturers. Variations in power input and bezel orientation are available as well.
For IFR GPS approach certification, GPS status annunciations are required to be in the pilot's field of view. These annunciations (or lights) indicate active switches such as the NAV/GPS and OBS (if applicable) modes. Other annunciations or alerts might include the following:

TERM - light that will signal pilot when operating within 30 miles of departure or arrival airport (i.e. Terminal area)
APR - light that signals pilot when the GPS is engaged in Approach mode
MSG - light that signals pilot that the GPS has generated a Message alert that should be viewed on the GPS
WPT - light that signals pilot that the GPS has generated a Waypoint alert that should be viewed on the GPS
INTG - light that will signal pilot when the GPS receiver detects a position error or is unable to calculate the Integrity of the position

Some annunciator units and annunciator control units or ACUs have a variety a these switches and annunciators depending on the GPS system to be interfaced with or the aircraft installation. However, there are certain annunciations such as MSG and WPT that are standard for all annunciators required.