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making course changes. This is consistent with the
intent of 14 CFR Section 91.181, which requires
pilots to operate along the centerline of an airway and
along the direct course between navigational aids or
fixes.
b. Turns which begin at or after fix passage may
exceed airway or route boundaries. FIG 5-3-1
contains an example flight track depicting this,
together with an example of an early turn.
AIM 2/14/08
5-3-8 En Route Procedures
c. Without such actions as leading a turn, aircraft
operating in excess of 290 knots true air speed (TAS)
can exceed the normal airway or route boundaries
depending on the amount of course change required,
wind direction and velocity, the character of the turn
fix (DME, overhead navigation aid, or intersection),
and the pilot's technique in making a course change.
For example, a flight operating at 17,000 feet MSL
with a TAS of 400 knots, a 25 degree bank, and a
course change of more than 40 degrees would exceed
the width of the airway or route; i.e., 4 nautical miles
each side of centerline. However, in the airspace
below 18,000 feet MSL, operations in excess of
290knots TAS are not prevalent and the provision of
additional IFR separation in all course change
situations for the occasional aircraft making a turn in
excess of 290 knots TAS creates an unacceptable
waste of airspace and imposes a penalty upon the
preponderance of traffic which operate at low speeds.
Consequently, the FAA expects pilots to lead turns
and take other actions they consider necessary during
course changes to adhere as closely as possible to the
airways or route being flown.
5-3-6. Changeover Points (COPs)
a. COPs are prescribed for Federal airways, jet
routes, area navigation routes, or other direct routes
for which an MEA is designated under 14 CFR
Part95. The COP is a point along the route or airway
segment between two adjacent navigation facilities or
waypoints where changeover in navigation guidance
should occur. At this point, the pilot should change
navigation receiver frequency from the station
behind the aircraft to the station ahead.
b. The COP is normally located midway between
the navigation facilities for straight route segments,
or at the intersection of radials or courses forming a
dogleg in the case of dogleg route segments. When
the COP is NOT located at the midway point,
aeronautical charts will depict the COP location and
give the mileage to the radio aids.
c. COPs are established for the purpose of
preventing loss of navigation guidance, to prevent
frequency interference from other facilities, and to
prevent use of different facilities by different aircraft
in the same airspace. Pilots are urged to observe COPs
to the fullest extent.
5-3-7. Holding
a. Whenever an aircraft is cleared to a fix other
than the destination airport and delay is expected, it
is the responsibility of the ATC controller to issue
complete holding instructions (unless the pattern is
charted), an EFC time and best estimate of any
additional en route/terminal delay.
NOTEOnly
those holding patterns depicted on U.S. government
or commercially produced (meeting FAA requirements)
low/high altitude enroute, and area or STAR charts should
be used.
b. If the holding pattern is charted and the
controller doesn't issue complete holding instructions,
the pilot is expected to hold as depicted on the
appropriate chart. When the pattern is charted, the
controller may omit all holding instructions except
the charted holding direction and the statement AS
PUBLISHED; e.g., HOLD EAST AS PUBLISHED.
Controllers shall always issue complete holding
instructions when pilots request them.
c. If no holding pattern is charted and holding
instructions have not been issued, the pilot should ask
ATC for holding instructions prior to reaching the fix.
This procedure will eliminate the possibility of an
aircraft entering a holding pattern other than that
desired by ATC. If unable to obtain holding
instructions prior to reaching the fix (due to
frequency congestion, stuck microphone, etc.), then
enter a standard pattern on the course on which the
aircraft approached the fix and request further
clearance as soon as possible. In this event, the
altitude/flight level of the aircraft at the clearance
limit will be protected so that separation will be
provided as required.
2/14/08 AIM
En Route Procedures 5-3-9
d. When an aircraft is 3 minutes or less from a
clearance limit and a clearance beyond the fix has not
　
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