The pilot in command of an aircraft:
1. must comply immediately to all instructions received from ATC.
2. is responsible only if he is the "pilot flying".
3. may deviate from air regulations for safety reasons.
4. may be exempt from air regulations in order to comply to an ATC instruction.
5. may ask for the modification of an unsatisfactory clearance.
"3. may deviate from air regulations for safety reasons." CORRECT.
ICAO Annex 2
2.3.1 Responsibility of pilot-in-command:
The pilot-in-command of an aircraft shall, whether manipulating the controls or not, be responsible for the operation of the aircraft in accordance with the Rules of the Air, except that the pilot-in-command may depart from these rules in circumstances that render such departure absolutely necessary in the interests of safety.
"5. may ask for the modification of an unsatisfactory clearance." CORRECT.
ICAO Doc 4444
4.5 AIR TRAFFIC CONTROL CLEARANCES
220.127.116.11 If an air traffic control clearance is not suitable to the pilot-in-command of an aircraft, the flight crew may request and, if practicable, obtain an amended clearance.
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