What is IFR in avionics?
Instrument flight rules (IFR) is one of two sets of regulations governing all aspects of civil aviation aircraft operations; the other is visual flight rules (VFR). IFR means a ceiling less than 1,000 feet AGL and/or visibility less than three miles. Low IFR (LIFR) is a sub-category of IFR. VFR means a ceiling greater than 3,000 feet AGL and visibility greater than five miles. Marginal VFR (MVFR) is a sub- category of VFR.
What is IFR equipment?
In the United States, instruments required for IFR flight in addition to those that are required for VFR flight are: heading indicator, sensitive altimeter adjustable for barometric pressure, clock with a sweep-second pointer or digital equivalent, attitude indicator, radios and suitable avionics for the route to be . It is interesting to note that there is no requirement for navigational equipment such as VOR and GPS, but you must have them equipped if you intend to use their associated facilities. Since IFR procedures rely heavily on these types of navigational equipment, you won’t go far without them.