MBot Posted December 24, 2017 Posted December 24, 2017 I have a question regarding the behaviour of the radar altimeter. Let's run through the following scenario. 1. Alt 100 m AGL, HÖJD CISI on RHM. HUD displays 100 m. 2. Turn the pressure know until the barometric altitude show 1000m. HUD display remains at 100. 3. Start to climb. When passing 550 m AGL, the marking on the HUD indicate that radar altitude is lost, as expected. Altitude displayed on the HUD continues to raise smoothly. 4. When at 700m AGL level off. The HUD displays 700 m. The barometric altimeter shows 1600 m. 5. Start to turn the pressure knob and subtract 100 m worth of pressure. The HUD will show 800 m, the barometric altimeter will show 1700 m. True altitude remains 700 m. At the end of this procedure, the altitude shown on the HUD is neither radar altitude nor barometric altitude. It can be adjusted higher or lower with the pressure knob, but does not display the actual altitude according to this pressure. Is this the correct behaviour that should be expected?
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