Small Aircraft
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Engineer; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 36; Flight Crew Total 5000; Flight Crew Type 500
En route between SDL and CHD; GPS unit failed. Upon reset; unit cycled off and on repeatedly. Reached for sectional and due to cockpit turbulence sectional ended up between lower legs; continued on the CHD airport. CHD Tower advised me to contact PHX Tower regarding 'airspace deviation' I believe.I assumed I was being radar tracked so continued on last known heading and altitude. I was unable to contact PHX Sky Harbor Tower or anyone other than SDL Tower and CHD Tower as sectional with all info unreachable. I had CHD Tower frequency up on radio with SDL Tower in backup; not FFZ or PHX. Should have requested from CHD Tower FFZ frequency and diverted to east. I believe I reverted to 'old memory' VFR landmarks.
A small aircraft pilot failed to contact PHX Tower before transitioning through their Class B airspace while on a VFR flight plan. The pilot did not have the PHX frequency available after their GPS unit failed and the sectional fell in an unreachable location.