---
title: "NCO.IDE.A.125 Operations under IFR – flight and navigational instruments and associated equipment — Part-NCO · Avioverse"
description: "Aeroplanes operated under IFR shall be equipped with: a means of measuring and displaying the following:"
url: "https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-d/nco-ide-a-125"
---

# NCO.IDE.A.125 Operations under IFR – flight and navigational instruments and associated equipment

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

IR Implementing rule

## NCO.IDE.A.125 Operations under IFR – flight and navigational instruments and associated equipment

Aeroplanes operated under IFR shall be equipped with:

(a) a means of measuring and displaying the following:

(1) magnetic heading;

(2) time in hours, minutes and seconds;

(3) barometric altitude;

(4) indicated airspeed;

(5) vertical speed;

(6) turn and slip;

(7) attitude;

(8) stabilised heading;

(9) outside air temperature; and

(10) Mach number, whenever speed limitations are expressed in terms of Mach number;

(b) a means of indicating when the supply of power to the gyroscopic instruments is not adequate; and

(c) a means of preventing malfunction of the airspeed indicating system required in (a)(4) due to condensation or icing.

IR · NCO.IDE.A.125 — Regulation (EU) No 965/2012 · Regulation (EU) 2019/1384 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM1 NCO.IDE.A.125 Operations under IFR – flight and navigational instruments and associated equipment

ALTERNATE SOURCE OF STATIC PRESSURE

Aeroplanes should be equipped with an alternate source of static pressure.

GM · GM1 NCO.IDE.A.125 — Regulation (EU) No 965/2012 · ED Decision 2014/016/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

GM Guidance material

## GM1 NCO.IDE.A.125(a)(3) Operations under IFR – flight and navigational instruments and associated equipment

ALTIMETERS

Altimeters with counter drum-pointer or equivalent presentation are considered to be less susceptible to misinterpretation for aeroplanes operating above 10 000 ft.

GM · GM1 NCO.IDE.A.125(a)(3) — Regulation (EU) No 965/2012 · ED Decision 2014/016/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

AMC Acceptable means of compliance

## AMC1 NCO.IDE.A.125(a)(9) Operations under IFR – flight and navigational instruments and associated equipment

MEANS OF DISPLAYING OUTSIDE AIR TEMPERATURE

(a) The means of displaying outside air temperature should be calibrated in degrees Celsius.

(b) In the case of aeroplanes with a maximum certified [take-off mass](https://avioverse.aero/glossary/easa/take-off-mass) (MCTOM) below 2 000 kg, calibration in degrees Fahrenheit is acceptable, when such unit is used in the AFM.

(c) The means of displaying outside air temperature may be an air temperature indicator that provides indications that are convertible to outside air temperature.

AMC · AMC1 NCO.IDE.A.125(a)(9) — Regulation (EU) No 965/2012 · ED Decision 2014/016/R · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART D: INSTRUMENTS, DATA AND EQUIPMENT](https://avioverse.aero/regulations/easa/air-ops/part-nco/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.