IFR Minimum Equipment and Maintenance – Part-NCO

Last updated: 09/27/2018


Your Cessna, Piper or any other GA aircraft might be fit for IFR and you don’t even know it. Europe had many different national regulations that required autopilots, DMEs, ADFs, slaved gyros and specific approvals for PBN capabilities. Switzerland was no exception. That is now all gone, thanks to Part-NCO.

Sound decision making and common sense now step into the void of missing over-regulation. This blog post guides you the way, if you are unsure if your aircraft may be used under instrument flight rules. Please note that all of this, however, does not apply to Annex I aircraft (under the old Basic Regulation formerly known as Annex II).

EU No 800/2013, or simply Part-NCO, superseded national regulations (if they existed before) and this has been a big step towards simpler and better rules for General Aviation. It became effective on August 25th 2016 in Switzerland and all of Europe.

Absolutely no national regulations may be added to the EU laws. If you have doubts about that, have a look at this EASA GA Leaflet about “Flying in the EU – Ops is in the air”:

EASA GA Leaflet Flying in the EU - Ops is in the air.PNG
If you ask me, Part-NCO means a lot. Bye, bye national gold-plating.

Many Swiss general aviation aircraft are now suddenly very close to being IFR capable. Any Cessna 172 probably only requires two more maintenance checks for basic en-route IFR flying. Depending on factory installed instrumentation it might even be fit for IFR approaches.

The European rules are now very similar in character to the FAA’s Part 91.

Before flying IFR

If you are going on an IFR flight, you should check the following points:

  1. Type certificate: Kinds of operation
    Does the type certificate data sheet or POH list IFR as a possible kind of operation?
  2. Basic instrumentation
    Does the airplane fulfill NCO.IDE.A.125?
  3. Communication and transponder equipment
    Does the airplane fulfill NCO.IDE.A.190/200?
  4. Navigation equipment
    Does the airplane fulfill NCO.IDE.A.195?
  5. Maintenance
    Have the transponder and static system been tested within the last 24 months?

Remember, what’s legal isn’t necessarily safe. Plan your flight with the equipment limitations in mind. With the minimum IFR equipment you might have to restrict yourself to fair-weather IFR with just a few stratus clouds to climb through.

The easiest way to become familiar with the requirements are the Easy Access Rules to Air Operations, available from EASA (search the pdf for “NCO.”). Of course, the rest of Part-NCO applies to you as well, but these are the most important bits.

Let’s look at the above mentioned checklist in more detail. For IFR flying you need the following:

1. Type certificate: Kinds of operation

Check if the type certificate allows IFR. Look up your airplane’s Type Certificate Data Sheet, TCDS, on the EASA or FAA website). If your airplane is antique or classic, it might have been certified under CAR 3 and the kind of operation could not be listed. In that case read your POH, it should mention IFR capabilities in Section 4 “Operating limitations”.

TCDS Cessna 400 kinds of operation IFR VFR day night
FAA TCDS Cessna 400
TCDS DA42 kinds of operation IFR VFR day night
EASA TCDS Diamond DA42
POH section 4 operating limittions - kind of operation IFR VFR day night
CAR 3 certified POH entry allowing all kinds of operation, depending on installed equipment

2. Basic instrumentation

NCO.IDE.A.125 IFR minimum equipment

  1. Magnetic compass;
  2. Clock displaying h, min, s (wrist watch is sufficient);
  3. Altimeter;
  4. Airspeed indicator;
  5. Vertical speed indicator;
  6. Turn and slip indicator;
  7. Attitude indicator;
  8. Directional gyro or other stabilized heading indicator;
  9. Outside air temperature;
  10. Vacuum pressure gauge;
  11. Pitot heat.

    Cessna 172 panel with EU EASA basic IFR instrumentation
    Does your plane check all the IFR boxes?

3. Communication and transponder equipment

NCO.IDE.A.190 Radio communication equipment

  1. Two-way radio, only if required by airspace or RMZ.

In airspace classes A-E, two-way communications must be maintained at all times. In airspace classes F-G only when entering an RMZ. However, IFR aircraft must be equipped with a radio, even on a flight that does not require its use (e.g. complete flight in airspace class G without RMZ).

NCO.IDE.A.200 Transponder

  1. Transponder, only if required by airspace or TMZ.

4. Navigation equipment

NCO.IDE.A.195 Navigation Equipment

  1. Navigation equipment enabling to proceed according to the ATS flight plan and airspace requirements (except VFR by reference to landmarks, a.k.a. pilotage);
  2. Sufficient navigation equipment to have a backup (e.g. any combination of two independent navigation systems: two CDIs, CDI/ADF, CDI/IFR GPS, possibly even radar vectors plus only one navigation system, etc.);
  3. If landing in IMC, the equipment required for the approach.

PBN specification

GM1 and GM2 of NCO.IDE.A.195 explain, which PBN specification may be used. It basically says that you must find a statement in your official aircraft documentation that defines the PBN specification. In new aircraft you’ll find this information in the POH/AFM, in most other aircraft it will be stated in the AFM supplement (AFMS). This would be the case for after-market Avidyne IFD or Garmin GTN installations.

AFM supplement PBN specification
AFM supplement with PBN specification

5. Maintenance

  1. Pitot-static system test;
  2. Transponder test.

These tests should have been complied with within the last 24 calendar months. In Switzerland, mechanics are asked to make a note in the journey log of the airplane that the tests have been passed to IFR standards.

However, if I look up Part-M I see a requirement for a test each year and for any airplane, be it IFR or VFR. On the other hand, on EuroGA.org, some people even suggest that today’s transponders check themselves and thus the requirement is fulfilled automatically. I don’t know the answer to that. I would simply stick to what my mechanic tells me. Update 09/27/2018: It is true that the yearly requirement of Part-M is an operational check only. However, an EASA SIB (SIB 2011-15R2) recommends an interval of 24 months. What you do with that recommendation is up to you.


The new Part-NCO rules give us a lot of freedom. It is our responsibility as pilot-in-command to check these five points set out above, before we take off under instrument flight rules. Depending on the airplane and its equipment, very much like your personal limits, you might be restricted to fair-weather IFR. We are asked to apply common sense by a regulation of EASA. Use the freedom, but don’t expect that what’s legal would be safe.

Note: This article has been updated in fall 2019 and was first published in mid 2016.

4 Comments Add yours

  1. Vince Fischer says:

    Hi Florian, I see a vacuum gauge as part of the IFR min equipment list, but what if the aircraft has no vacuum system? Does one just need a gauge stuck in a hole in the panel with nothing behind, with the indicator fixed in the green zone ??? 😉

    Liked by 1 person

    1. Hi Vince

      Good idea! Not sure if your mechanic would sign that off, though… 😉

      I probably over-simplified what NCO.IDE.A.125 actually says. In proper EASA English the regulation says, quote: a means of indicating when the supply of power to the gyroscopic instruments is not adequate;

      I suppose you always have some kind of indication, even with ram air suction. Never flew with anything other than electric gyros w/ INOP flag and vacuum gyros with vacuum gauge.

      Thanks for your comment!


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