6/17/21
AIM
Aeronautical Information Manual
Explanation of Changes
Effective: June 17, 2021
a. 1
−
1
−
9. INSTRUMENT LANDING SYS-
TEM (ILS)
This change is to edit the following text and add an
additional figure to clarify that charted procedures
with localizer coverage outside the Standard Service
Volume (SSV) have been validated and approved by
flight inspection.
b. 1
−
1
−
13. USER REPORTS REQUESTED
ON NAVAID OR GLOBAL NAVIGATION
SATELLITE SYSTEM (GNSS) PERFOR-
MANCE OR INTERFERENCE
1
−
2
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4. PILOTS AND AIR TRAFFIC CON-
TROLLERS RECOGNIZING INTERFER-
ENCE OR SPOOFING
The change to paragraph 1
−
2
−
4 is a complete rewrite.
It was necessary to update information regarding uses
and affected systems during GPS outages. The
changes to paragraph 1
−
1
−
13 incorporate a paragraph
title change, a correction to previous paragraph
numbering, and a partial rewrite. This will aid in more
extensive reporting requests to enable better analysis
of outage events.
c. 4
−
1
−
11. DESIGNATED UNICOM/MULTI-
COM FREQUENCIES
Over the Continental United States and Coastal
Waters 123.4 MHz and 123.45 MHz are reserved by
the Federal Communications Commission (FCC) for
stations individually licensed to commercial aircraft
and accessory manufacturers to use as flight test
frequencies. Aircraft may only communicate with
their associated company ground stations and these
frequencies may not be used for air
−
to
−
air
communications of any sort. In order to bring
attention to the proper usage of 123.4 MHz and
123.45 MHz, this change adds these frequencies to
TBL 4
−
1
−
3, Other Frequency Usage Designated by
the FCC, along with the description of their use and
the note that they are not for air
−
to
−
air communica-
tion.
d. 4
−
2
−
3. CONTACT PROCEDURES
In order to prevent confusion with the proper use of
the frequency 123.4 MHz, this editorial change
removes 123.4 as the generic ATC frequency used in
this paragraph and the EXAMPLE following the
paragraph, and substitutes a different generic ATC
frequency.
e. 5
−
1
−
1. PREFLIGHT PREPARATION
5
−
1
−
2. FOLLOW IFR PROCEDURES
EVEN WHEN OPERATING VFR
7
−
1
−
2. FAA WEATHER SERVICES
7
−
1
−
5. PREFLIGHT BRIEFING
This change inserts language in the Aeronautical
Information Manual that pilots do not need to call
Flight Service in order to obtain a regulatory
compliant briefing and encourages pilots to self
−
brief
before calling a flight service station.
f. 5
−
4
−
6. APPROACH CLEARANCE
5
−
4
−
9. PROCEDURE TURN AND HOLD
−
IN
−
LIEU OF PROCEDURE TURN
The proposed change adds subparagraph 5
−
4
−
6e8
regarding arrival holding patterns and removes the
current note after 5
−
4
−
9a5 which currently addresses
arrival holding patterns inappropriately as hold
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in
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lieu of procedure turn.
g. 5
−
4
−
23. VISUAL APPROACH
This change updates Aeronautical Information
Manual (AIM) guidance concerning multiple visual
approaches to parallel runways at the same airport.
h. 6
−
2
−
4. EMERGENCY LOCATOR TRANS-
MITTER (ELT)
This change removes reference to the satellite
monitoring of ELTs transmitting on 121.5 MHz and
243.0 MHz. This update also focuses on the
advantages of ELTs which transmit on 406 MHz.
i. 6
−
4
−
3. REESTABLISHING RADIO CON-
TACT
7
−
1
−
24. MICROBURSTS
This change reflects the removal of the term ARINC
and reflects the addition of new communication relay
Explanation of Changes
E of Chg
−
1