AMC1 ACNS.E.TAWS.075 Prioritisation schemes

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ED Decision 2013/031/R

TAWS prioritisation schemes should be compliant with the content of Table 2:

Priority	Description	Alert Level	Comments
1	Reactive Windshear Warning	W
2	Sink Rate Pull-Up Warning	W	Continuous
3	Excessive Closure Pull-Up Warning	W	Continuous
4	RTC Terrain Warning	W
5	V1 Callout	A
6	Engine Fail Callout	W
7	FLTA Pull-Up Warning	W	Continuous
8	PWS Warning	W
9	RTC Terrain Caution	C	Continuous
10	Minimums	A
11	FLTA Caution	C	7 s period
12	Too Low Terrain	C
13	PDA ‘Too Low Terrain’ Caution	C
14	Altitude Callouts	A
15	Too Low Gear	C
16	Too Low Flaps	C
17	Sink Rate	C
18	Don’t Sink	C
19	Glideslope	C	3 s period
20	PWS Caution	C
21	Approaching Minimums	A
22	Bank Angle	C
23	Reactive Windshear Caution	C
Mode 6	TCAS RA (‘Climb’, ‘Descent’, etc)	W	continuous
Mode 6	TCAS TA (‘Traffic, Traffic’)	C	Continuous

Table 2: Alert Prioritization Scheme

Note 1: These alerts can occur simultaneously with TAWS voice callout alerts.

Note 2: W= Warning, C= Caution, A= Advisory.

TAWS internal priority alerting scheme should be compliant with the content of Table 3 below

Priority	Description
1	Sink Rate Pull-Up Warning
2	Terrain Awareness Pull-Up warning
3	Terrain Awareness Caution
4	PDA ‘Too Low Terrain’ Caution
5	Altitude Callouts ‘500’
6	Sink Rate
7	Don’t Sink (Mode 3)

TABLE 3: TAWS Internal Alert Prioritization Scheme

Source-Title: AMC1 ACNS.E.TAWS.075 Prioritisation schemes View latest amendments

Erulesid: ERULES-1963177438-15819 Compare versions

Domain: Air traffic management/Air navigation services

Applicabilitydate: 1 January, 2014

Entryintoforcedate: 1 January, 2014

Regulatorysource: ED Decision 2013/031/R Navigate

Regulatorysubject: CS-ACNS

Typeofcontent: AMC to CS (Acceptable means of compliance to certification specification)

Parentir: CS ACNS.E.TAWS.075 Prioritisation scheme

Origin: EASA

Category: EAR