How is the failure of the function defined in paragraph 3.1.1 of ETSO-C147a classified for malfunctions causing display or annunciation of hazardously misleading information?

It is a major failure condition.

What is the failure condition classification for loss of the function defined in paragraph 3.1.1 of ETSO-C147a?

It is a minor failure condition.

What is the applicability date condition for new models of active TAS airborne equipment under ETSO-C147a?

The requirements apply to new models designed and manufactured on or after the date of this ETSO.

ETSO-C147a

Q: What are the two equipment classes for active traffic advisory system (TAS) airborne equipment under ETSO-C147a, and what does each class include?

Class A incorporates a horizontal situation display that indicates the presence and relative location of intruder aircraft, and an aural alert informing the crew of a Traffic Advisory (TA). Class B incorporates an aural alert and a visual annunciation informing the crew of a TA.

Q: Which RTCA document and section define the minimum performance standard for active TAS airborne equipment under ETSO-C147a?

RTCA Document No. RTCA/DO-197A, 'Minimum Operational Performance Standards for An Active Traffic Alert and Collision Avoidance System I (ACTIVE TCAS 1),' Section Two (2), September 12, 1994, as amended by Appendix 1 of ETSO-C147a.

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ETSO-C147a

ED Decision 2016/029/R

Traffic Advisory System (TAS) Airborne Equipment

1 Applicability

This ETSO gives the requirements that new models of active traffic advisory system (TAS) airborne equipment that are designed and manufactured on or after the date of this ETSO must meet in order to be identified with applicable ETSO marking. Equipment Classes are:

— Class A. Equipment incorporating a horizontal situation display that indicates the presence and relative location of intruder aircraft, and an aural alert informing the crew of a Traffic Advisory (TA).

— Class B. Equipment incorporating an aural alert and a visual annunciation informing the crew of a TA.

2 Procedures

2.1 General

Applicable procedures are detailed in CS-ETSO Subpart A.

2.2 Specific

None.

3 Technical Conditions

3.1 Basic

3.1.1 Minimum Performance Standard

Standards set forth in RTCA Document No. RTCA/DO-197A, “Minimum Operational Performance Standards for An Active Traffic Alert and Collision Avoidance System I (ACTIVE TCAS 1),” Section Two (2) September 12, 1994, as amended by Appendix 1 of this document.

3.1.2 Environmental Standard

See CS-ETSO, Subpart A, paragraph 2.1.

3.1.3 Computer Software

See CS-ETSO, Subpart A, paragraph 2.2.

3.1.4 Electronic Hardware Qualification

See CS-ETSO, Subpart A, paragraph 2.3.

3.2 Specific

None

3.2.1 Failure Condition Classification

See CS-ETSO, Subpart A, paragraph 2.4.

Failure of the function defined in paragraph 3.1.1 of this ETSO has been determined to be a major failure condition for malfunctions causing the display or annunciation of hazardously misleading information in airborne aircraft.

Loss of the function defined in paragraph 3.1.1 is a minor failure condition.

4 Marking

4.1 General

Marking is detailed in CS-ETSO Subpart A paragraph 1.2.

4.2 Specific

None.

5 Availability of Referenced Document

See CS-ETSO Subpart A paragraph 3.

[Amdt ETSO/12]

Details

Source-Title: ETSO-C147a View latest amendments

Erulesid: ERULES-1963177438-9261 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 12

Applicabilitydate: 19 December, 2016

Entryintoforcedate: 19 December, 2016

Regulatorysource: ED Decision 2016/029/R Navigate

Regulatorysubject: CS-ETSO

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR

ETSO-C147a

Traffic Advisory System (TAS) Airborne Equipment

Details

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