Final answer:
Under certain conditions, a pilot may leave a clearance limit if communication with ATC is lost. There are specific procedures outlined by the FAA to be followed in such cases. approach clearance, they should proceed according to the highest of: The minimum IFR altitude Expected COAST clearance Expected assigned altitude Enroute altitude.
Step-by-step explanation:
A pilot may leave a clearance limit if communications with ATC (Air Traffic Control) has been lost under certain conditions. According to the FAA (Federal Aviation Administration) regulations, a pilot must adhere to the rules of 'Lost Communications Procedures.' If a pilot is operating under Instrument Flight Rules (IFR) and experiences a communication failure with ATC, they can proceed as follows: Firstly, the pilot should continue to the fix specified in their clearance or route, or to the point specified in the procedures applicable to the destination airport.
If there is no fix or specified point, the pilot should fly the route or procedure that ATC has previously issued, or, if none was issued, the pilot should proceed along the route or procedure filed in the flight plan. If a pilot is in the vicinity of the destination airport and has not received an approach clearance, they should proceed according to the highest of: The minimum IFR altitude Expected COAST clearance Expected assigned altitude Enroute altitude.