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inform the controller accordingly. Code 7500 will trigger
the special emergency indicator in all radar ATC facilities.
c. Air traffic controllers will acknowledge and
confirm receipt of transponder Code 7500 by asking
the pilot to verify it. If the aircraft is not being
subjected to unlawful interference, the pilot should
respond to the query by broadcasting in the clear that
the aircraft is not being subjected to unlawful
interference. Upon receipt of this information, the
controller will request the pilot to verify the code
selection depicted in the code selector windows in the
transponder control panel and change the code to the
appropriate setting. If the pilot replies in the
affirmative or does not reply, the controller will not
ask further questions but will flight follow, respond to
pilot requests and notify appropriate authorities.
d. If it is possible to do so without jeopardizing the
safety of the flight, the pilot of a hijacked passenger
aircraft, after departing from the cleared routing over
which the aircraft was operating, will attempt to do
one or more of the following things, insofar as
circumstances may permit:
1. Maintain a true airspeed of no more than
400 knots, and preferably an altitude of between
10,000 and 25,000 feet.
2. Fly a course toward the destination which the
hijacker has announced.
e. If these procedures result in either radio contact
or air intercept, the pilot will attempt to comply with
any instructions received which may direct the
aircraft to an appropriate landing field.
6−3−5. Fuel Dumping
a. Should it become necessary to dump fuel, the
pilot should immediately advise ATC. Upon receipt
of information that an aircraft will dump fuel, ATC
will broadcast or cause to be broadcast immediately
and every 3 minutes thereafter the following on
appropriate ATC and FSS radio frequencies:
EXAMPLE−
Attention all aircraft−fuel dumping in progress
over−(location) at (altitude) by (type aircraft) (flight
direction).
b. Upon receipt of such a broadcast, pilots of
aircraft affected, which are not on IFR flight plans or
special VFR clearances, should clear the area
specified in the advisory. Aircraft on IFR flight plans
or special VFR clearances will be provided specific
separation by ATC. At the termination of the fuel
dumping operation, pilots should advise ATC. Upon
receipt of such information, ATC will issue, on the
appropriate frequencies, the following:
EXAMPLE−
ATTENTION ALL AIRCRAFT−FUEL DUMPING
BY−(type aircraft)−TERMINATED.

2/19/04 AIM
Two−way Radio Communications Failure 6−4−1
Section 4. Two-way Radio Communications Failure
6−4−1. Two-way Radio Communications
Failure
a. It is virtually impossible to provide regulations
and procedures applicable to all possible situations
associated with two-way radio communications
failure. During two-way radio communications
failure, when confronted by a situation not covered in
the regulation, pilots are expected to exercise good
judgment in whatever action they elect to take.
Should the situation so dictate they should not be
reluctant to use the emergency action contained in
14 CFR Section 91.3(b).
b. Whether two-way communications failure
constitutes an emergency depends on the circumstances,
and in any event, it is a determination made
by the pilot. 14 CFR Section 91.3(b) authorizes a
pilot to deviate from any rule in Subparts A and B to
the extent required to meet an emergency.
c. In the event of two-way radio communications
failure, ATC service will be provided on the basis that
the pilot is operating in accordance with 14 CFR
Section 91.185. A pilot experiencing two-way
communications failure should (unless emergency
authority is exercised) comply with 14 CFR
Section 91.185 quoted below:
NOTE−
Capitalization, print and examples changed/added for
emphasis.
1. General. Unless otherwise authorized by
ATC, each pilot who has two-way radio communications
failure when operating under IFR shall comply
with the rules of this section.
2. VFR conditions. If the failure occurs in
VFR conditions, or if VFR conditions are encountered
after the failure, each pilot shall continue the
flight under VFR and land as soon as practicable.
NOTE−
This procedure also applies when two-way radio failure
occurs while operating in Class A airspace. The primary
objective of this provision in 14 CFR Section 91.185 is to
　
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