400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
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56<br />
Section 2<br />
TAWS Operation<br />
Figure 2-9 Nearest Airport Criteria Page<br />
(4) The aircraft has an altitude greater than 150’ AGL and less than 1<strong>500</strong>’ AGL.<br />
(5) The aircraft is within 15 NM of the departure airport.<br />
NOTE: There are additional factors beyond what is outlined above that may alter the<br />
determined TAWS flight phase.<br />
Nearest Airport Criteria & TAWS Phase of Flight<br />
Changes to the Nearest Airport Criteria Page (Figure 2-9) affects how TAWS performs. The nearest airport<br />
list is used to derive the TAWS destination airport when there is no loaded active flight plan or when<br />
off the active flight plan or when deviating from the active flight plan (whenever the TAWS algorithms go<br />
into estimation mode). In turn, the nearest airport list is used to determine the TAWS phase of flight. The<br />
TAWS phase of flight dictates the Required Terrain Clearance (RTC) levels at which Forward Looking Terrain<br />
Avoidance (FLTA) alerting occurs, as described on page 58. TAWS Premature Descent Alerting (PDA)<br />
alerting is also affected by nearest airport list configuration; airports that are not in the nearest list would<br />
not have PDA alerts issued.<br />
As an example, if the pilot configures the unit to include only airports with runways <strong>500</strong>0’ or longer,<br />
only these are added to the nearest airport list. The TAWS phase of flight is affected in that all airport<br />
runways under <strong>500</strong>0’ are NOT included in TAWS calculations. During a cross-country flight with this<br />
configuration, only airports runways <strong>500</strong>0’ or greater cause the unit to go into Terminal or Approach Mode<br />
from Enroute mode. If the pilot makes an emergency landing at an airport that did not show up in the<br />
nearest airport list, FLTA alerts would be issued throughout the descent.<br />
TAWS Destination Airport<br />
The TAWS destination airport is considered to be the next airport in the flight plan while adhering<br />
to the flight plan path. If no flight plan is entered, or if the aircraft is not adhering to the entered flight<br />
plan path, the TAWS destination airport is estimated using the Nearest Airport Criteria as described in the<br />
section above.
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