What is the reference for lost comms under IFR?

Lost Communications while in VFR Conditions: 14 CFR 91.185 is clear to say: “If the failure occurs in VFR conditions, or if VFR conditions are encountered after the failure, each pilot shall continue the flight under VFR and land as soon as practicable.”



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The Importance of Understanding Squawk Codes They serve their intended purpose of keeping everyone safe in the air under the guidance of ATC and communication from the pilots. They also work well to provide notice of emergency as referred to above with the squawk codes 7500, 7600, and 7700.

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The most well know of these is the code 7700. This is used to indicate an emergency of any kind. A pilot will enter this when in an emergency situation - either instructed by ATC after declaring an emergency or without communication if there is no time.

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If there is any question of weather, you can (and should) retain your IFR clearance until on the ground and then cancel. However, there may be good reasons to cancel depending upon circumstances. For example somebody may be following you and cannot be cleared for the approach until you cancel your IFR clearance.

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A pilot experiencing two-way radio failure at an assigned altitude of 7,000 feet is cleared along a direct route which will require a climb to a minimum IFR altitude of 9,000 feet, should climb to reach 9,000 feet at the time or place where it becomes necessary (see 14 CFR Section 91.177(b)).

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§ 91.123 Compliance with ATC clearances and instructions. (a) When an ATC clearance has been obtained, no pilot in command may deviate from that clearance unless an amended clearance is obtained, an emergency exists, or the deviation is in response to a traffic alert and collision avoidance system resolution advisory.

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