What is the role of flight recording system in TAWS?

The flight recording system records TAWS alerts and inhibition of the FLTA or PDA functions.

What is a Premature Descent Alert (PDA) function?

Premature Descent Alert (PDA) function includes detection and alerting for Premature Descents Along the Final Approach Segment

What kind of sensor input does Class A TAWS use?

Class A TAWS uses radio altimeter sensor input.

What is the difference between Class A and Class B TAWS in terms of terrain display capability?

Class A TAWS has a terrain display capability, while Class B TAWS has the capability to drive a terrain display.

What alerting capabilities do TAWS Class A and B provide for imminent contact with ground?

TAWS Class A and B provide alerting for imminent contact with ground indications (GPWS functions) including excessive Rates of Descent and negative Climb Rate or Altitude Loss After Take-Off or Go-around. They also provide a voice callout when descending through a predefined altitude above the terrain or nearest runway elevation, specifically a 500 ft call out.

Do both Class A and Class B TAWS use position source input?

Yes, both Class A and Class B TAWS use position source input.

What functions are included in the Forward Looking Terrain Avoidance (FLTA) function?

The Forward Looking Terrain Avoidance (FLTA) function includes a Reduced Required Terrain Clearance (RTC) function, an Imminent Terrain Impact function, and a FLTA Turning Flight function.

CS ACNS.E.TAWS.010 Required Functions and Interfaces

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ED Decision 2013/031/R

(See AMC1 ACNS.E.TAWS.010, AMC2 ACNS.E.TAWS.010)

TAWS Class A or Class B provides suitable alerting and warning capabilities and other system interfaces to support the following functions:

TAWS System Function		Class A TAWS	Class B TAWS
Alerting	Imminent contact with ground indications (GPWS functions) including: (19) excessive Rates of Descent; (20) negative Climb Rate or Altitude Loss After Take-Off or Go-around. A Voice callout when descending through a predefined altitude above the terrain or nearest runway elevation.	X With a 500 ft call out	x With a 500 ft call out
	A forward Looking Terrain Avoidance (FLTA) function, including: · a Reduced Required Terrain Clearance (RTC) function; · an Imminent Terrain Impact function; · a FLTA Turning Flight function.	x	x
	A Premature Descent Alert (PDA) function, including detection and alerting for Premature Descents Along the Final Approach Segment	x	x
	Excessive Closure Rate to Terrain	x
	Flight Into Terrain When not in Landing Configuration	x
	Excessive Downward Deviation from a glide slope or glide path	x
	TAWS and sensor failure monitoring and annunciation function	x	x
	Capability to initiate the TAWS self-test function on the ground and where feasible in the air	x	x

TAWS System Interfaces		Class A TAWS	Class B TAWS
	A terrain display capability	x
	Capability to drive a terrain display		x
	The use of position source input	x	x
	The use of landing guidance deviation input	x
	The use of radio altimeter sensor input	x
	The use of Terrain and Airport information	x	x
	Interface with the flight recording system to record TAWS alerts and inhibition of the FLTA or PDA functions	x	x
	The use of landing gear and flaps position	x
	The use of roll attitude input	x
	The interface with flight deck audio systems	x

Details

Source-Title: CS ACNS.E.TAWS.010 Required Functions and Interfaces View latest amendments

Erulesid: ERULES-1963177438-15813 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: CS (Certification specification)

Origin: EASA

Category: EAR

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