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Part Three: Section 2

TAWS Alerts

Section 3: TAWS Alerts

Alerts are issued when flight conditions meet

parameters that are set within TAWS software

algorithms. TAWS alerts typically employ either a

CAUTION or a WARNING alert severity level, or

both. When an alert is issued, visual annunciations

are displayed. Aural alerts are simultaneously issued.

Annunciations appear in a dedicated field in the lower

left corner of the display.

TAWS Annunciation Field

Annunciations are color-coded according to the

TAWS Alert Summary table. Pop-up terrain alerts can

also appear during an alert, but only when the TAWS

Page is not displayed. There are two options when

an alert is displayed:

To acknowledge the pop-up alert and return to

the currently viewed page:

Press the CLR button.

To acknowledge the pop-up alert and quickly

access the TAWS Page:

Press the ENT button.

NOTE: To further capture the attention of the pilot,

TAWS issues aural (voice) messages that accompany

visual annunciations and pop-up alerts. Some aural

messages are configurable during installation of the

system. For a summary of aural messages, see the

TAWS Alert Summary table in Appendix A.

NOTE: TAWS Caution Alerts are displayed as constant

black text on a yellow background; TAWS Warning

Alerts are displayed as constant white text on a red

background.

Forward Looking Terrain Avoidance

The unit will issue terrain alerts not only when the

aircraft altitude is below the terrain elevation but

also when the aircraft is projected to come within

minimum clearance values of the terrain. This

alerting, called Forward Looking Terrain Avoidance

(FLTA), is also provided for obstacles. Any potential

impact points are depicted on the display. There

are 2 levels of severity for FLTA alerts. They are

cautionary (amber) and warning (red) in nature and

are described in further detail below.

CAUTION—Estimated potential impact in approximately 30

seconds after pop-up alert and annunciation. FLTA caution

alerts are accompanied by the aural message "Caution Ter-

rain; Caution Terrain" OR "Terrain Ahead; Terrain Ahead".

Similarly, a "Caution Obstacle; Caution Obstacle" or "Obstacle

Ahead; Obstacle Ahead" alert is also provided.

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