Det finns ingen reglering som täcker minsta besättningen när de flyger privat, annat än vad som krävs i flygplansmanualen.
För kommersiella flygningar blir det lite mer komplicerat och svaret är, ja, det beror på det.
I EASA-kommersiell flygning definieras minsta besättningskompositon här:
EU OPS (965) Subpart N
Ops 1.940 Sammansättning av flygbesättningen
(b) Minimum flight crew for operations under IFR or at night. For operations under IFR or at night, an operator shall ensure that:
for all turbo-propeller aeroplanes with a maximum approved passenger seating configuration of more than nine and for all turbo-jet aeroplanes, the minimum flight crew is two pilots; or
aeroplanes other than those covered by subparagraph (b)1 above are operated by a single pilot provided that the requirements of Appendix 2 to OPS 1.940 are satisfied. If the requirements of Appendix 2 are not satisfied, the minimum flight crew is two pilots.
Och sedan mycket längre bilaga 2 som anger:
(a) Aeroplanes referred to in OPS 1.940(b)2 may be operated by a single pilot under IFR or at night when the following requirements are satisfied:
the operator shall include in the Operations Manual a pilot's conversion and recurrent training programme which includes the additional requirements for a single pilot operation;
in particular, the cockpit procedures must include:
(i) engine management and emergency handling;
(ii) use of normal, abnormal and emergency checklist;
(iii) ATC communication;
(iv) departure and approach procedures;
(v) autopilot management; and
(vi) use of simplified in-flight documentation;
the recurrent checks required by OPS 1.965 shall be performed in the single-pilot role on the type or class of aeroplane in an environment representative of the operation;
the pilot shall have a minimum of 50 hours flight time on the specific type or class of aeroplane under IFR of which 10 hours is as commander; and
the minimum required recent experience for a pilot engaged in a single-pilot operation under IFR or at night shall be 5 IFR flights, including three instrument approaches, carried out during the preceding 90 days on the type or class of aeroplane in the single-pilot role. This requirement may be replaced by an IFR instrument approach check on the type or class of aeroplane
(Texten kopieras ihop eftersom det är en smärta) att få en fungerande länk till en konsoliderad version av EU-OPS.