1.1. On airways the minimum levels are specified on ENRC.

1.2. The minimum level calculation for off airway IFR flight complies with the following criteria:

a) the altitude of the highest point within a 8 Km (4.32NM) strip on either side of the route centerline is sought;

b) 300m (1000 feet) – are added - gauge. If the value found does not correspond to a flight level, it should be rounded out to the IFR flight level just above.

Note 1: Over mountainous regions the gauge is 600m (2000 feet).

a) departure, destination and ALTN AD must be certified for day IFR OPS;

b) in case the departure AD is not IFR OPR certified, predominant meteorological conditions at this AD must be equal or higher than MNM established for VFR OPS;

c) the meteorological conditions of involved aerodromes be in accordance with the visibility and ceiling parameters (when requested) established in concerned charts and publications issued by DECEA;

d) ACFT must be in conditions to established bilateral communications with ATS units responsible for departure, destination and ALTN AD, and those responsible for the airspaces overflown;

e) the aerodrome must have approach chart and/or instrument departure chart (IAC/SID), published by DECEA, in force;

f) meteorological information on aerodrome surface wind, atmospheric pressure, ceiling and visibility must be made available by:
- ATS unit at the aerodrome; or
- Aerodrome Automatic Broadcasting Station;

g) the aerodrome must provide Aircraft Coordination Frequency (FCA) in case there is no ATS unit at the aerodrome, or this one does not operate during the whole day; and

h) when there is regular air transport operation, the meteorological reports of the aerodrome must be made available in the OPMET network by METAR or METAR AUTO.

NOTE: Guidance on precision IFR operation and criteria to withdraw operations are prescribed by ICA 100-16 – ILS Operation.

a) the departure AD must be certified for night IFR OPS, otherwise FLT must begin in daylight period, complying with the requirements for day IFR FLT;

b) destination and ALTN AD must be certified for night IFR OPS; when the arrival estimated time at the destination AD is during daylight period, the only requirement shall be that such aerodrome be certified for day IFR OPS. Similar criteria shall be applied to ALTN airports if the estimated time about this (via destination AD or deviation point) is during daylight period;

c) criteria specified in 2.1 must be met for the non-precision day IFR operation at the aerodrome and the lighted marking of the landing and take-off runway must be operational according to the criteria established by ANAC.

NOTE: Guidance on precision IFR operation and criteria to withdraw operations are prescribed by ICA 100-16 – ILS Operation.

3.1. At DECEA's discretion, in specific situations, the pilot shall maintain the flight under IFR rules, even when operating under VMC.