HS 125 Series
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 75; Flight Crew Total 13000; Flight Crew Type 1200
Communication Breakdown
ATC Issue All Types; Deviation - Altitude Excursion From Assigned Altitude
Air Traffic Control Issued New Clearance; Flight Crew Returned To Clearance
ATC Equipment / Nav Facility / Buildings; Chart Or Publication
When requested by ATC to change frequencies several times we experienced dead frequencies and returned to previous frequencies at least on four different occasions speaking to multiple controllers we were requested to descend to flight level 320; upon leveling at flight level the Controller asked us what flight level we were at and we replied leveling 320; at this point that Controller advised us we were requested to 330; we replied returning 330; at this point the controller advised us to just maintain 320.
HS-125 First Officer reported they had communication issues with ATC while in cruise flight that resulted in an altitude excursion.