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AIM

10/12/17

Explanation of Changes

E of Chg

−1

Aeronautical Information Manual

Explanation of Changes

Effective: October 12, 2017

a. 1

−1−9. Instrument Landing System (ILS)

5

−4−20. Approach and Landing Minimums

This change updates guidance to improve clarity and
to be consistent with information contained in FAA
Order JO 7110. 65, Air Traffic Control, Paragraph
3

−7−5, Precision Approach Critical Area.

b. 2

−3−5. Holding Position Markings

This change, created in response to the Runway
Safety Council #34 Call to Action, emphasizes the
need for pilots to stop at holding position markings
and updates the language throughout the paragraph.
As such, several instances of “should” and “supposed
to” are replaced by the word “must” with regard to the
requirement for aircraft to stop at holding position
markings.

c. 3

−5−7. Special Air Traffic Rules (SATR) and

Special Flight Rules Area (SFRA)

Appendix 3. Abbreviations

This change introduces SATR, makes reference to 14
CFR 93, and explains SFRAs. It provides information
needed to help pilots better understand their
responsibilities regarding SATR and SFRA.

d. 3

−5−8. Weather Reconnaissance Area

(WRA)

Appendix 3. Abbreviations

This change introduces, defines, and explains WRAs
to better inform air traffic control and pilots of WRAs
in general and weather reconnaissance/research
aircraft operations.

e. 4

−1−21. Airport Reservation Operations and

Special Traffic Management Programs

This change updates guidance to be consistent with
FAA Order JO 7210.3, Paragraph 17

−13−4, Airport

Reservation Office. This change states that standby
lists are not maintained; and that flights with declared
emergencies do not require reservations. It also
updates contact information.

f. 5

−4−5. Instrument Approach Procedure

(IAP) Charts

This change clarifies the use of stepdown fixes on
approaches. This change also aligns our guidance
with that issued by the International Civil Aviation
Organization (ICAO).

g. 5

−4−22. Use of Enhanced Flight Vision

Systems (EFVS) on Instrument Approaches

This change reflects the expansion of EFVS
operations explained in the December 2016 EFVS
Rule. It also adds figures that depict the two types of
EFVS operations.

h. 7

−1−4. Graphical Forecasts for Aviation

(GFA)

This change introduces new GFA products which
replace outdated textual area forecasts. These
products are expected to maximize operational
benefits to users and enhance the safety of the
National Airspace System.

i. 7

−1−11. Weather Observing Programs

7

−1−30. International Civil Aviation Orga-

nization (ICAO) Weather Formats

Appendix 3. Abbreviations

This change informs pilots of Automated Lightning
Detection and Reporting System (ALDARS) report-
ing capabilities so they are able to properly interpret
the weather observations, that include thunderstorms
(TS) and cloud

−to−ground lightning, detected by

ALDARS. Specifically, the following codes should
be used: “TS” when cloud

−to−ground lightning is

detected within 5 NM of the Airport Reference Point
(ARP), “VCTS” when cloud

−to−ground lightning is

between 5

−10 NM of the ARP, and “LTG DSNT” in

Remarks when cloud

−to−ground lightning is detect-

ed between 10

−30 NM of the ARP.

j. 7

−1−13. ATC Inflight Weather Avoidance

Assistance

This change deletes the reference to composite
airspace, and specifically to North Pacific (NOPAC)
and Central East Pacific (CEPAC) routes. Weather