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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


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)


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


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


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