Garmin G1000H Bell 407GX Pilot's Guide - Page 87

FLIGHT INSTRUMENTS MINIMUM DESCENT ALTITUDE/DECISION HEIGHT ALERTING For altitude awareness, a Minimum Descent Altitude (MDA) or Decision Height (DH), based on barometric altitude or radar altitude, can be set. When active, the altitude setting is displayed to the lower left of the altimeter and with a bug at the corresponding altitude along the altimeter (once the altitude is within the visible range of the tape). The following visual annunciations alert the pilot when approaching the MDA or DH: • When the aircraft altitude descends to within 2500 feet of the MDA/DH setting, a box labeled BARO MIN or RA MIN (based on the selected altitude source) appears with the altitude in light blue text. The bug appears in light blue on the altitude tape at the corresponding altitude once in range. • When the aircraft passes through 100 feet of the MDA or DH, the bug and text turn white. • Once the aircraft reaches the MDA/DH, the bug and text turn yellow and the aural alert, "Minimums Minimums", is generated. When the radar altimeter is selected as the altitude source for the Minimum Descent Altitude alerting function, the color of the current radar height changes to yellow. Within 2500 feet Within 100 feet Altitude Reached MDA/DH Bug MDA/DH Setting Figure 2-44 Barometric MDA/DH Alerting Visual Annunciations Alerting is inhibited while the aircraft is on the ground and until the aircraft reaches 150 feet above the setting for the alert. If the aircraft proceeds to climb after having reached the MDA/DH, once it reaches 50 feet above the MDA/DH, alerting is disabled. The MDA/DH may be set from either PFD and is synchronized on both PFDs. The function is reset when the power is cycled. Setting the barometric minimum descent altitude and bug: 1) Press the TMR/REF Softkey. 2) Turn the large FMS Knob to highlight the Minimums field. 3) Turn the small FMS Knob to select the desired altitude source: barometric (BARO) or radar altimeter (RAD ALT). OFF is selected by default. Press the ENT Key or turn the large FMS Knob to highlight the next field. 4) Use the small FMS Knob to enter the desired altitude (from zero to 16,000 feet). 5) To remove the window, press the CLR Key or press the TMR/REF Softkey. Figure 2-45 Timer/References Window, MDA/DH Setting 190-01255-00 Rev. A Garmin G1000H™ Pilot's Guide for the Bell 407GX 75