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EXAMPLE−
3.United Four Seventeen, cross Lakeview V−O−R at or
above Flight Level two zero zero, descend and maintain
sixthousand."
NOTE−
3.The pilot is authorized to conduct descent at pilot’s
discretion until reaching Lakeview VOR and must comply
with the clearance provision to cross the Lakeview VOR at
or above FL 200. After passing Lakeview VOR, the pilot is
expected to descend at the suggested rates until reaching
the assigned altitude of 6,000 feet.
EXAMPLE−
4.United Four Seventeen, cross Lakeview V−O−R at
sixthousand, maintain six thousand."
NOTE−
4.The pilot is authorized to conduct descent at pilot’s
discretion, however, must comply with the clearance
provision to cross the Lakeview VOR at 6,000 feet.
EXAMPLE−
5.United Four Seventeen, descend now to Flight
Leveltwo seven zero, cross Lakeview V−O−R at or below
one zero thousand, descend and maintain six thousand."
NOTE−
5.The pilot is expected to promptly execute and complete
descent to FL 270 upon receipt of the clearance. After
reaching FL 270 the pilot is authorized to descend at
pilot’s discretion" until reaching Lakeview VOR. The pilot
must comply with the clearance provision to cross
Lakeview VOR at or below 10,000 feet. After Lakeview
VOR the pilot is expected to descend at the suggested rates
until reaching 6,000 feet.
EXAMPLE−
6.United Three Ten, descend now and maintain Flight
Level two four zero, pilot’s discretion after reaching Flight
Level two eight zero."
NOTE−
6.The pilot is expected to commence descent upon receipt
of the clearance and to descend at the suggested rates until
reaching FL 280. At that point, the pilot is authorized to
continue descent to FL 240 within the context of the term
at pilot’s discretion" as described above.
31.6In case emergency authority is used to deviate
from the provisions of an ATC clearance, the pilot in
command shall notify ATC as soon as possible and
obtain an amended clearance. In an emergency
situation which results in no deviation from the rules
prescribed in 14CFR Part 91 but which requires ATC
to give priority to an aircraft, the pilot of such aircraft
shall, when requested by ATC, make a report within
48 hours of such emergency situation to the manager
of that ATC facility.
31.7The guiding principle is that the last ATC
clearance has precedence over the previous ATC
clearance. When the route or altitude in a previously
issued clearance is amended, the controller will
restate applicable altitude restrictions. If altitude to
maintain is changed or restated, whether prior to
departure or while airborne, and previously issued
altitude restrictions are omitted, those altitude
restrictions are canceled, including Departure
Procedures and Standard Terminal Arrival Route
(STAR) altitude restrictions.
EXAMPLE−
1.A departure flight receives a clearance to destination
airport to maintain FL 290. The clearance incorporates a
DP which has certain altitude crossing restrictions. Shortly
after takeoff, the flight receives a new clearance changing
the maintaining FL from 290 to 250. If the altitude
restrictions are still applicable, the controller restates
them.
2.A departing aircraft is cleared to cross Fluky
Intersection at or above 3,000 feet, Gordonville VOR at or
AIP ENR 1.1−29
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
above 12,000 feet, maintain FL 200. Shortly after
departure, the altitude to be maintained is changed to
FL240. If the altitude restrictions are still applicable, the
controller issues an amended clearance as follows: cross
Fluky Intersection at or above three thousand, cross
Gordonville V−O−R at or above one two thousand,
maintain Flight Level two four zero."
3.An arriving aircraft is cleared to the destination airport
via V45 Delta VOR direct; the aircraft is cleared to cross
Delta VOR at 10,000 feet, and then to maintain 6,000 feet.
Prior to Delta VOR, the controller issues an amended
clearance as follows: turn right heading one eight zero
for vector to runway three six I−L−S approach, maintain
sixthousand."
NOTE−
Because the altitude restriction cross Delta V−O−R at
10,000 feet" was omitted from the amended clearance, it is
no longer in effect.
31.8Pilots of turbojet aircraft equipped with
　
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