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]
EASA aviation regulations require specific aural and visual alerts for Terrain Awareness and Warning Systems (TAWS). Testing must validate alerts for conditions like altitude loss, terrain proximity, and excessive descent. Visual alerts should be concise and consistent with aural warnings like "Too Low Terrain" or "Pull-Up," ensuring pilot awareness.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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