When can a VFR on top clearance be assigned by ATC?
When can a VFR-on-Top clearance be assigned by ATC? Only upon request of the pilot when conditions are indicated to be suitable. When must a pilot fly at a cardinal altitude plus 500 feet on an IFR flight plan? When assigned a VFR-on-Top clearance.
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ATC will not authorize VFR or VFR-on-top operations in Class A airspace.
VFR-on-Top Restrictions:VFR-on-top is not permitted in certain airspace areas, such as Class A airspace, certain restricted areas, etc. Consequently, IFR flights operating VFR-on-top will avoid such airspace.
A VFR-On-Top clearance has its limitations. Here are a few you need to follow: Pilots may not fly below minimum en route IFR altitudes because you could crash into the terrain. Minimum en route altitudes exist regardless of IFR or VFR weather conditions and weather assigned a specific altitude or VFR conditions on top.
(1) A rest required under paragraph (b)(1) of this section may be scheduled for or reduced to a minimum of 8 hours if the flight crewmember is given a rest period of at least 10 hours that must begin no later than 24 hours after the commencement of the reduced rest period.
(a) The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft. (b) In an in-flight emergency requiring immediate action, the pilot in command may deviate from any rule of this part to the extent required to meet that emergency.
An ATC clearance must be obtained prior to operating within a Class B, Class C, Class D, or Class E surface area when the weather is less than that required for VFR flight.