190-00709-05 Rev. D
Garmin G1000 Pilot’s Guide for the Socata TBM 850/900
85
FLIGHT INSTRUMENTS
MINIMUM DESCENT ALTITUDE/DECISION HEIGHT ALERTING
For altitude awareness, a Minimum Descent Altitude (MDA) or Decision Height (DH), based on barometric
altitude, temperature compensated 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,
RA MIN, or COMP MIN (based on the selected altitude source) appears with the altitude in cyan text (or
magenta for TEMP COMP). The bug appears in cyan (or magenta for TEMP COMP) 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.
Figure 2-44 Barometric MDA/DH Alerting Visual Annunciations
Altitude Reached
Within 100 feet
MDA/DH
Setting
MDA/DH
Bug
Within 2500 feet
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), temperature compensated
(TEMP COMP), 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.
