The ALT-4 is a 3 1/8” instrument that contains a precision encoding altimeter and a wide range vertical speed indicator. The altimeter conforms to ANSI standard atmosphere rules from –700 ft up to a maximum of 30 000 ft. The altimeter can display altitude in feet or meters and local pressure can be set in millibars or inches of mercury. The ALT-4 also provides a transponder compatible Serial RS232 and parallel gillham code output.
The onboard VSI indicator is altitude compensated and can be displayed in either feet/minute (ft/min) or meters/second (m/s). It also offers a digital readout with a wide range from +/-20 ft/min to as high as +/-10 000 ft/min, it also offers a logarithmic analog display with a +/-2000 ft range. The VSI can be calibrated by the user once the instrument has been installed in the aircraft.
In addition the ALT-4 provides an OAT sender which is used in determining the density altitude of the aircraft. The ALT-4 can also be used to measure relative altitude and it has a facility for the pilot to enter a reference altitude and deviation band that has to be kept.
MGL Avionics offers a three-year limited warranty on all EFIS and single-instrument products in its product line. This warranty also applies to instruments purchased prior to thier announcement. All MGL products are covered for three years against manufacturing or product defects, and the units will be repaired or replaced as necessary at no charge. One exclusion is the LCD screen, which, if damaged by the customer, will not be replaced free of charge.
Precision altimeter from –700 ft up to a maximum of 30 000 ft (-213m to 9144m)
Provides a transponder compatible Serial RS232 and parallel gillham code output.
Built in encoder test functions
The altimeter can display altitude in feet or meters, local pressure can be set in millibars or inches of
Contains a wide range VSI indicator from +/-20 ft/min to as high as +/-10 000 ft/min
VSI units can be in feet/minute (ft/min) or in meters/second (m/s)
Records the maximum and minimum OAT (outside air temperature) and maximum altitude reached in
Records maximum and minimum OAT in temporary memory since instrument power up
Standard 3 1/8” aircraft enclosure (can be front or rear mounted)
Rotary control plus 2 independent buttons for easy menu navigation and user input
Alarm output as well as a red LED illuminates when the alarm has been activated
Large backlit graphic LCD with adjustable contrast
Wide input supply voltage range of 8 to 30V DC with built in voltage reversal and over voltage protection
for harsh electrical environments
Light weight design
Field upgradeable firmware
1 year limited warranty
Is this MGL Avionics ALT-4 altimeter approved for certified aircraft?
No, this is not FAA Approved for use in certificated aircraft. Does this unit meet FAA requirements for an encoding altimeter used with a transponder in an experimental aircraft?
The MGL Avionics ALT-4 altimeter is acceptable for use with a transponder as long as its for an experimental aircraft.