[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR91.123]

[Page 192]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (Continued)
 
PART 91--GENERAL OPERATING AND FLIGHT RULES--Table of Contents
 
                         Subpart B--Flight Rules
 
Sec. 91.123  Compliance with ATC clearances and instructions.

    (a) When an ATC clearance has been obtained, no pilot in command may 
deviate from that clearance unless an amended clearance is obtained, an 
emergency exists, or the deviation is in response to a traffic alert and 
collision avoidance system resolution advisory. However, except in Class 
A airspace, a pilot may cancel an IFR flight plan if the operation is 
being conducted in VFR weather conditions. When a pilot is uncertain of 
an ATC clearance, that pilot shall immediately request clarification 
from ATC.
    (b) Except in an emergency, no person may operate an aircraft 
contrary to an ATC instruction in an area in which air traffic control 
is exercised.
    (c) Each pilot in command who, in an emergency, or in response to a 
traffic alert and collision avoidance system resolution advisory, 
deviates from an ATC clearance or instruction shall notify ATC of that 
deviation as soon as possible.
    (d) Each pilot in command who (though not deviating from a rule of 
this subpart) is given priority by ATC in an emergency, shall submit a 
detailed report of that emergency within 48 hours to the manager of that 
ATC facility, if requested by ATC.
    (e) Unless otherwise authorized by ATC, no person operating an 
aircraft may operate that aircraft according to any clearance or 
instruction that has been issued to the pilot of another aircraft for 
radar air traffic control purposes.

(Approved by the Office of Management and Budget under control number 
2120-0005)

[Doc. No. 18834, 54 FR 34294, Aug. 18, 1989, as amended by Amdt. 91-227, 
56 FR 65658, Dec. 17, 1991; Amdt. 91-244, 60 FR 50679, Sept. 29, 1995]

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