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Garmin G1000 Cockpit Reference Guide for the Socata TBM 850

190-00708-00 Rev. A

10-12

SECTION 10 – HAZARD

AVOIDANCE

NOTE: If TAWS alerts are inhibited when the Final

Approach Fix is the active waypoint in a GPS

WAAS approach, a LOW ALT annunciation may

appear on the PFD next to the altimeter if the

current aircraft altitude is at least 164 feet below

the prescribed altitude at the Final Approach

Fix.

Manual System Test

A system test is automatically performed at power-up.

After sucessful completion of the test, “TAWS System

Test, OK” is heard.

The system test may also be initiated manually, but

only when the aircraft is on the ground. To manually verify

proper operation of the aural and visual annunciations

of the system, perform the following steps.

While the TAWS Page is displayed, press the

Key.

Turn the small

FMS

Knob to select ‘Test

TAWS’.

Press the

ENT

Key. During the test ‘TAWS TEST’

is displayed in the center of the TAWS Page.

When all is in working order, “TAWS System

Test, OK” is heard.

Forward Looking Terrain Avoidance (FLTA)

The Forward Looking Terrain Avoidance alert is

composed of two sub-functions:

Reduced Required Terrain Clearance (RTC) and

Reduced Required Obstacle Clearance (

ROC)

This provides alerts when the aircraft ﬂight path

is above terrain and/or obstacles, yet is projected to

come within minimum clearance values outlined in the

following table. When an RTC or ROC alert is issued, a

potential impact point is displayed on the TAWS Page as

a yellow or red ‘X’.

Imminent Terrain Impact (

ITI) and Imminent

Obstacle Impact (IOI)

This provides alerts when the aircraft is below the

elevation of terrain in the aircraft’s projected path. ITI and

IOI alerts are accompanied by a potential impact point

displayed on the TAWS Page as a yellow or red ‘X’. The

alert is given when the projected vertical ﬂight path is

calculated to come within minimum clearance altitudes

in the following table.

Phase of Flight Level Flight Descending

Enroute 700 ft. 500 ft.

Terminal 350 ft. 300 ft.

Approach 150 ft. 100 ft.

Departure 100 ft. 100 ft.

During the ﬁnal approach phase of ﬂight, RTC/ROC/

ITI/IOI alerts are automatically inhibited when the aircraft

is below 200 feet AGL while within 0.5 nm of the approach

runway or is below 125 feet AGL while within 1 nm of the

runway.

Premature Descent Alert (PDA)

A Premature Descent Alert is issued when the system

detects that the aircraft is signiﬁcantly below the normal

approach path to a runway. The PDA alert mode functions

only during descent to land.

PDA alerting begins when the aircraft is within 15 nm

of the destination airport and ends when the aircraft is

either 0.5 nm from the runway threshold OR is at an alti-

tude of 125 feet AGL while within 1 nm of the threshold.

During the ﬁnal descent, algorithms will set a threshold

for alerting based on speed, distance, and other param-

eters.

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