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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replace outdated textual area forecasts.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