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 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.

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.

What kind of sensor input does Class A TAWS use?

Class A TAWS uses radio altimeter sensor input.

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 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 is a Premature Descent Alert (PDA) function?

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

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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