AC 90-66B

Change 1Historical

Advisory circular · Non-Towered Airport Flight Operations

A newer version is currentThis is a historical version. AC 90-66C is the version in force, approved June 6, 2023.
Approved
February 25, 2019
Last reviewed
July 18, 2024
Cancels
AC90-66B
Family
AC 90-66 · 5 versions
Revision
B, change 1
14 CFR parts
1, 91, 103, 107

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 21, 2025.

Show pages 1–12

closest to the glider operating area. This will allow gliders to fly the same direction traffic pattern as powered aircraft in certain wind conditions and necessitate a separate, opposing direction traffic pattern in other wind conditions. (See examples in Appendix B).

12.2.3 Typically, glider traffic patterns have entry points (initial points) from 600 to 1,000 feet AGL.

12.3 Ultralight Vehicles.

12.3.1 In accordance with 14 CFR part 103, ultralight vehicles are required to yield the right-of-way to all aircraft.

12.3.2 U ltralight vehicles should fly the rectangular pattern as described in Appendix B.

Pattern altitude should be 500 feet below and inside the standard pattern established for the airport. An ultralight pattern with its own dedicated landing area will typically have a lower traffic pattern parallel to the standard pattern, with turns in the opposite direction.

12.3.3 All pilots should be aware that ultralights will fly significantly slower than airplanes.

Ultralights may also exhibit very steep takeoff and approach angles. Turns may be executed near the end of the runway in order to clear the area expediently.

12.4 Lighter-Than-Air Aircraft.

12.4.1 A balloon has the right-of-way over any other category of aircraft and does not follow a standard traffic pattern.

12.4.2 Due to limited maneuverability, airships do not normally fly a standard traffic pattern.

However, if a standard traffic pattern is flown, it will be at an airspeed below most other aircraft.

12.5 Parachute Operations.

12.5.1 All activities are normally conducted under a NOTAM noting the location, altitudes, and time or duration of jump operations. The Chart Supplement lists airports where permanent Drop Zones (DZ) are located.

12.5.2 Jumpers normally exit the aircraft either above, or well upwind of, the airport and at altitudes well above traffic pattern altitude. Parachutes are normally deployed between 2,000 feet and 5,000 feet AGL and can be expected to be below 3,000 feet AGL within 2 miles of the airport.

12.5.3 Pilots of jump aircraft are required by part 105 to establish two-way radio communications with the ATC facility that has jurisdiction over the affected airspace prior to jump operations for the purpose of receiving information in the aircraft about known air traffic in the vicinity. In addition, when jump aircraft are operating at or in the vicinity of an airport, pilots are also encouraged to provide advisory information on the CTAF. For example, “Chambersburg traffic, jumpers away over Chambersburg.”

12.5.4 When a DZ has been established at an airport, parachutists are expected to land within the DZ. At airports that have not established DZs, parachutists should avoid landing on runways, taxiways, aprons, and their associated safety areas. Pilots and parachutists should both be aware of the limited flight performance of parachutes and take steps to avoid any potential conflicts between aircraft and parachute operations.

12.5.5 Appendix C depicts operations conducted by parachutists.

13 AC FEEDBACK FORM. For your convenience, the AC Feedback Form is the last page of this AC. Note any deficiencies found, clarifications needed, or suggested improvements regarding the contents of this AC on the Feedback Form.

Appendix A

TRAFFIC PATTERNS Single Runway (Diagram from the AIM, Paragraph 4-3-3)

EXA MPLE− Key to traffic pattern operations

1. Enter pattern in level flight, abeam the midpoint of the runway, at pattern altitude.

2. Maintain pattern altitude until abeam approach end of the landing runway on downwind leg, begin descent and turn base at approximately 45 degrees from the intended landing point.

3. Complete turn to final at least ¼ mile from the runway.

4. Continue straight ahead until beyond departure end of runway.

5. If remaining in the traffic pattern, commence turn to crosswind leg beyond the departure end of the runway within 300 feet of pattern altitude.

6. If departing the traffic pattern, continue straight out, or exit with a 45-degree turn (to the left when in a left-hand traffic pattern; to the right when in a right-hand traffic pattern) beyond the departure end of the runway, after reaching pattern altitude.

A-1

Appendix A Parallel Runways (Diagram from the AIM, Paragraph 4-3-3) EX AMPLE− Key to traffic pattern operations

1. Enter pattern in level flight, abeam the midpoint of the runway, at pattern altitude.

2. Maintain pattern altitude until abeam approach end of the landing runway on downwind leg, begin descent and turn base at approximately 45 degrees from the intended landing point.

3. Complete turn to final at least ¼ mile from the runway.

4. Continue straight ahead until beyond departure end of runway.

5. If remaining in the traffic pattern, commence turn to crosswind leg beyond the departure end of the runway within 300 feet of pattern altitude.

6. If departing the traffic pattern, continue straight out, or exit with a 45-degree turn (to the left when in a left-hand traffic pattern; to the right when in a right-hand traffic pattern) beyond the departure end of the runway, after reaching pattern altitude.

7. Do not overshoot final or continue on a track which will penetrate the final approach of the parallel runway.

8. Do not continue on a track which will penetrate the departure path of the parallel runway.

A-2

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Appendix B APPENDIX B. GLIDER OPERATIONS Ultralight Aircraft Pattern ULTRALIGHT 500 FOOT

OPERATING AREA PATTERN RUNWAY WIND

SEPARATE ULTRALIGHT

OPERATING AREA

• ULTRALIGHT OPERATING 500 FOOT AREA SYMBOL

PATTERN Glider Aircraft Pattern

GLIDER PATTERN IS INSIDE THE POWERED PATTERN ENTRY

POWERED AIRCRAFT PATTERN

GLIDER PATTERN ENTRY 600-1000' AGL EXIT TOWS TO 2000- 3000' AGL UPWIND

GLIDER OPERATING AREA

POWERED RUNWAY

GLIDER PATTERN OPPOSITE SIDE AND WIND

SEPARATE FROM POWERED RUNWAY

GLIDER OPERATING AREA GLIDER PATTERN EXIT TOWS TO 2000- 3000' AGL UPWIND

POWERED PATTERN GLIDER PATTERN ENTRY 600-1000' AGL B-1

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Appendix C APPENDIX C. PARACHUTE OPERATIONS

SIDE VIEW PARACHUTE OPERATIONS

- 2 MILES

- 1 MILE > |

PROBABLE CHUTE OPENING

EXTREME ZONE EXTREME 3000* $ 2000" PATTERN "A 1250' WINDOW 750 RUNWAY 3000→1

TOP VIEW -AIR TRAFFIC PATTERN 1/2 MILE 4,000° RUNWAY I 1 MILE 2 MILES

EXTREME

OPENING ZONE "NOTE: THIS DEPICTS AN AIRPORT

WHERE NO DROP ZONE HAS BEEN ESTABLISHED.* C-1

A dvisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the General Aviation and Commercial Division (AFS-800) at 9-AFS-800-Correspondence@faa.gov or the Flight Standards Directives Management Officer at 9-AWA-AFS-140-Directives@faa.gov.

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