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Garmin G1000 Cockpit Reference Guide for the Cessna Nav III

10-13

SECTION 10 – HAZARD

AVOIDANCE

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. There are three different

scenarios to consider with PDA:

• No Approach Loaded - 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 altitude 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

parameters.

• Non-Precision Approach Loaded - PDA alerting

begins when the FAF is the active waypoint AND the

aircraft is within 15 nm of the destination airport.

Again, algorithms are used to set a threshold for

alerting based upon various parameters. PDA

alerting ends at 0.5 nm from the runway threshold

OR at an altitude of 125 feet AGL while within 1

nm of the threshold.

• ILS Approach Loaded—PDA alerting begins when

the FAF is the active waypoint AND the aircraft is

within 15 nm of the destination airport. Prior to

reaching the FAF, a PDA alert will be issued if the

aircraft descends 200 feet below the FAF altitude.

Once the aircraft intercepts the glideslope, PDA will

alert the pilot if the aircraft descends 0.7 degrees

below the glideslope. PDA alerting ends 0.5 nm

from the runway threshold OR at an altitude of 125

feet AGL while within 1 nm of the threshold.

Runway Threshold

Final Approach Fix

Figure 10-21 Non-Precision Approach PDA Alert Threshold

Runway Threshold

Final Approach Fix

PDA Alert is

0.7 Below Glideslope

Glideslope Intercept

Figure 10-22 ILS Approach PDA Alert Threshold

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