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AIM

2/28/19

Explanation of Changes

E of Chg

−1

Aeronautical Information Manual

Explanation of Changes

Effective: February 28, 2019

a. Preface: AIM Basic Flight Information and

ATC Procedures

5

−1−1. Preflight Preparation

5

−1−3. Notice to Airmen (NOTAM) System

7

−1−5. Preflight Briefing

This change advises NAS users of the removal of
Part 1, FDC NOTAMS, from the Notices to Airmen
Publication (NTAP); and provides a more accurate
means of obtaining that information.

b. 1

−1−19. Ground Based Augmentation Sys-

tem (GBAS) Landing System (GLS)

Due to discussions in related industry and govern-
ment forums, this change provides expanded
explanations regarding approach service volumes
(both textual and diagram) for standardization.
FIG 1

−1−8, GLS Standard Approach Service Vol-

ume, is also added.

c. 1

−2−1. General

1

−2−2. Required Navigation Performance

(RNP)

5

−2−9. Instrument Departure Procedures

(DP) 

− Obstacle Departure Procedures (ODP),

Standard Instrument Departures (SID), and
Diverse Vector Areas (DVA)

5

−4−1. Standard Terminal Arrival (STAR)

Procedures

5

−4−5. Instrument Approach Procedure

(IAP) Charts

There was not enough adequate information
concerning Performance

−Based Navigation (PBN)

and Advanced Required Navigational Performance
(A

−RNP) available to flight crews and operators in

the AIM. This expansion in the description and
advantages of these navigation specifications
(NavSpecs) will provide better guidance as to what
A

−RNP is, how it will be applied, and its applicability

in the PBN NAS. Additional information is being
added to better clarify NavSpecs, RNP, and PBN
understanding in AIM Chapter 1. Associated
paragraph changes are necessary to ensure harmo-
nization between all the paragraphs in the AIM.

Please note that some material in paragraph 1

−2−2

has been moved but the information is the same.

d. 2

−1−2. Visual Glideslope Indicators

This change aligns the AIM and the graphical
depiction of the Pulsating Visual Approach Slope
Indicator (PVASI) to portray the on glide path
indication as either a steady white or alternating red
and white light. This reflects the two types of PVASI
systems that are available for installation.

e. 3

−4−9. Obtaining Special Use Airspace

Status

5

−1−1. Preflight Preparation

5

−1−3. Notice to Airmen (NOTAM) System

5

−1−16. RNAV and RNP Operations

Appendix 3. Abbreviations/Acronyms

This change 

addresses the FAA’s discontinuation of

the Direct Users Access Terminal System (DUATS)
II contract, including vendors CSRA and Lockheed
Martin.

f. 4

−1−16. Safety Alert

This change expands the description of the minimum
safe altitude warning (MSAW) function to include
en route radar facilities. A new section is added to
alert pilots that the MSAW function may be inhibited
by radar facilities for airspace overlying non

−US

terrain where accurate terrain and obstacle clearance
data is unavailable.

g. 4

−3−21. Practice Instrument Approaches

This change clarifies that separation services should
only be required during the missed approach segment
of a visual flight rules (VFR) practice approach if they
were required procedurally during the approach
segment, as detailed by FAA Order JO 7110.65, Air
Traffic Control, paragraph 4

−8−11 a. 2. This change

aligns the AIM with guidance in the 7110.65.

h. 4

−4−16. Traffic Alert and Collision Avoid-

ance System (TCAS I &II)

This change clarifies and expands the TCAS II
actions to help pilots better grasp TCAS. Please note
the some information has been rearranged for ease of
understanding.