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NCC.IDE.A.135 Terrain awareness warning system (TAWS)

ANNEX VI (Part-NCC) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IRImplementing rule

NCC.IDE.A.135Terrain awareness warning system (TAWS)

Turbine-powered aeroplanes with a maximum certified take-off mass (MCTOM) of more than 5 700 kg or a maximum operational passenger seating configuration (MOPSC) of more than nine shall be equipped with a TAWS that meets the requirements for:

(a)class A equipment, as specified in an acceptable standard, in the case of aeroplanes for which the individual certificate of airworthiness (CofA) was first issued after 1 January 2011; or

(b)class B equipment, as specified in an acceptable standard, in the case of aeroplanes for which the individual CofA was first issued on or before 1 January 2011.

IR · NCC.IDE.A.135 — Regulation (EU) No 965/2012 · Regulation (EU) No 800/2013 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMCAcceptable means of compliance

AMC1 NCC.IDE.A.135Terrain awareness warning system (TAWS)

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EXCESSIVE DOWNWARDS GLIDESLOPE DEVIATION WARNING FOR CLASS A TAWS The requirement for a Class A TAWS to provide a warning to the flight crew for excessive downwards glideslope deviation should apply to all final approach glideslopes with angular vertical navigation (VNAV) guidance, whether provided by the instrument landing system (ILS), microwave landing system (MLS), satellite-based augmentation system approach procedure with vertical guidance (SBAS APV (localiser performance with vertical guidance approach LPV)), ground-based augmentation system (GBAS (GPS landing system, GLS)) or any other systems providing similar guidance. The same requirement should not apply to systems providing vertical guidance based on barometric VNAV.

AMC · AMC1 NCC.IDE.A.135 — Regulation (EU) No 965/2012 · ED Decision 2013/021/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GMGuidance material

GM1 NCC.IDE.A.135Terrain awareness warning system (TAWS)

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ACCEPTABLE STANDARD FOR TAWS An acceptable standard for Class A and Class B TAWS may be the applicable European technical standards order (ETSO) issued by the Agency or equivalent.

GM · GM1 NCC.IDE.A.135 — Regulation (EU) No 965/2012 · ED Decision 2013/021/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

All rules in SUBPART D: INSTRUMENTS, DATA AND EQUIPMENT

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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