AMC1 ACNS.E.TAWS.035Â Aural and visual alerts
ED Decision 2019/011/R
(a)Â Â Â Â The testing of the TAWS system integration within the aircraft should address the provision of the alerts listed in Table 1 below. In addition to this minimum set, other implemented optional voice alerts should be tested.
|
Alert
Condition |
Caution |
Warning |
|
Ground proximity Altitude Loss after Take-off Class A & Class B equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âDonât Sinkâ and âToo Low Terrainâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Envelope 1 (Not in Landing Configuration) Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âToo Low Terrainâ and âToo Low Gearâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Envelope 2 Insufficient Terrain Clearance (Landing and Go around configuration) Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert  âToo Low Terrainâ and âToo Low Flapsâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Envelope 4C Insufficient Terrain Clearance (Take-off configuration) Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert  âToo Low Terrainâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Excessive Glide Slope or Glide Path Deviation Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âGlide Slopeâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Advisory Voice Call Out Class A & Class B equipment |
Visual Alert None Required Aural Alert  âFive Hundredâ |
Visual Alert None required Aural Alert None Required |
|
Reduced Required Terrain Clearance Class A & Class B equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert Minimum selectable Voice Alerts: Â âCaution, Terrain; Caution, Terrainâ and âTerrain Ahead; Terrain Aheadâ |
Visual Alert Red text message that is obvious, concise and must be consistent with the Aural message Aural Alert Minimum selectable Voice Alerts: Â âCaution, Terrain; Terrain; Pull-Up, Pull-Upâ and âTerrain Ahead, Pull-Up; Terrain Ahead, Pull-Upâ |
|
Imminent Impact with Terrain Class A & Class B equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert Minimum selectable Voice Alerts: Â âCaution, Terrain; Caution, Terrainâ and âTerrain Ahead; Terrain Aheadâ |
Visual Alert Red text message that is obvious, concise and must be consistent with the Aural message Aural Alert Minimum selectable Voice Alerts: Â âCaution, Terrain; Terrain; Pull-Up, Pull-Upâ and âTerrain Ahead, Pull-Up; Terrain Ahead, Pull-Upâ |
|
Premature Descent Alert (PDA) Class A & Class B equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âToo Low Terrainâ |
Visual Alert None required Aural Alert None Required |
|
Ground Proximity Envelope 1, 2 or 3 Excessive Descent Rate Class A & Class B equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âSink Rateâ |
Visual Alert Red text message that is obvious, concise and must be consistent with the Aural message Aural Alert â Pull-Upâ |
|
Ground Proximity Excessive Closure Rate (Flaps not in Landing Configuration) Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âTerrain- Terrainâ |
Visual Alert Red text message that is obvious, concise and must be consistent with the Aural message Aural Alert â Pull-Upâ |
|
Ground Proximity Excessive Closure Rate (Landing Configuration) Class A equipment |
Visual Alert Amber text message that is obvious, concise, and must be consistent with the Aural message Aural Alert âTerrain- Terrainâ |
Visual Alert None required Aural Alert â Pull-Upâ -Â for gear up None required - for gear down |
TABLE 1: Visual and aural alerts
(b)Â Â Â Â If a two tone sweep (âWhoop Whoopâ) is used then the complete cycle of the two tone sweeps plus annunciation may be extended from â1.4â to â2â seconds.
(c)Â Â Â Â Â Note: GPWS alerting thresholds may be adjusted or modified to be
more compatible with the FLTA alerting functions and to minimize GPWS nuisance
alerts.
(d)Â Â Â Â Parameters such as airspeed, groundspeed barometric altitude rate should be included in the logic that determines basic GPWS alerting time.
(e)Â Â Â Â GPWS alerting thresholds may be adjusted or modified to be more compatible with the FLTA alerting functions and to minimize GPWS nuisance alerts.
(f)Â Â Â Â Â Consideration should be given to presenting voice announcements at a pre-set level via headsets when they are in use.
[Issue: CS-ACNS/2]
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