91.241 Compliance with ATC clearances and instructions

• (a) A pilot of an aircraft operating in a control area or control zone designated under Part 71 must--
  • (1) except when manoeuvring in accordance with an ACAS resolution advisory or a GPWS or TAWS alert, comply with any ATC clearance or instruction issued by the ATC unit responsible for the control area or control zone; and
  • (2) when a deviation from an ATC clearance or instruction is required for the safe operation of the aircraft, notify ATC of the deviation as soon as possible.
• (b) A pilot of an aircraft need not comply with an ATC clearance or instruction if compliance would cause the pilot to breach any rule in this Part.
• (c) A pilot of an aircraft who elects not to comply with an ATC clearance or instruction under paragraph (b) must immediately notify the appropriate ATC unit of the non-compliance.