Ford Partner Recognition

EAA's Ford X-Plan Partner Recognition Program is a special savings opportunity developed exclusively for EAA members. It offers you the ability to purchase or lease eligible vehicles at EAA member pricing.

Read More

EAA Sport Aviation

One of EAA’s most popular member benefits is EAA Sport Aviation, the award-winning monthly magazine that covers the full spectrum of association activity.

Read More

EAA Flight Advisors

EAA's Flight Advisors program is designed to increase sport aviation safety by developing a corps of volunteers who have demonstrated expertise in specific areas of flying and making them available to EAA members who may be preparing to fly an unfamiliar aircraft.

Read More

Individual Membership

Your Individual membership makes you a part of the passionate EAA Family and gives access to EAA-Exclusive benefits. Membership also gives you thousands of opportunities to go flying at local aviation events, participate at your local EAA chapter, and give youngsters their very first flight.

Read More

Benefits & Discounts

From benefits like EAA Insurance Solutions and EAA Finance Solutions to EAA Webinars and EAA Technical Counselors we have something for everyone with an interest in  aviation! 

Read More

ASTC Passport Program

EAA members can enjoy more than 300 museum and science centers worldwide free of charge, thanks to a partnership with the Association of Science-Technology Centers and its ASTC Travel Passport Program.

Read More

Warbirds of America

"Keep 'em Flying": That’s the motto - and the mission - of EAA Warbirds of America, the EAA division that provides programs and services to those interested specifically in former military aircraft.

Read More

Find a Flight Advisor

EAA Flight Advisors can help you find the right path to get you flying efficiently and, most importantly, safely.

Read More

Next Steps After Plane is Built

You've finally achieved your dream of building your own airplane. Here are some resources that will help you fly safely or sell your airplane.

Read More

Soaring Society of America, Inc.

Formed in 1932, the Soaring Society of America (SSA) promotes all…

Read More

Getting Started

Register as an ultralight student or pilot and discover the types of ultralights you can have fun in!

Read More

Become a Sport Pilot

Affordable, achievable, and fun! Experience the freedom of flight as a sport pilot.

Read More

Join Warbirds

Warbirds of America membership connects you with other enthusiasts, restorers, and pilots.

Read More

Join VAA

VAA membership connects you with other enthusiasts, restorers, and pilots.

Read More

Join IAC

IAC membership connects you with other enthusiasts, builders, pilots, and competitors.

Read More

Connect With Aviators

Your local EAA chapter allows you to share your interest with thousands of other members in a variety of different events and activities, including fly-ins, picnics, workshops, Young Eagles rallies, and more.

Read More

Start a Chapter

All you need to start is enthusiasm, an interest in aviation, and the desire to share this interest with other people in your community.

Read More

Chapter Insurance Program

EAA’s Chapter General Liability Insurance Program protects chapters, their members, officers, directors, and volunteers from alleged negligence. Participation in this insurance program is mandatory for all chapters located in the United States and Canada. A policy limit of $1 million to $3 million is available.

Read More

Leadership Academy

Interactive workshop weekends in Oshkosh focused on topics important to chapter leaders.  

Read More

10 Flight For the Year Recognition

Each pilot who flies 10 or more Young Eagles during a calendar year will receive a custom lapel pin and will earn Young Eagles credits that can be used to help offset the cost of sending a young person to an EAA Air Academy session in Oshkosh or assist their local Young Eagles and youth outreach programs.

Read More

Calendar of Events

With more than 1,000 listings, EAA’s calendar of events is the most comprehensive listing of aviation activities found anywhere online.

Read More

AirVenture Schedule of Events

Fill up your itinerary and sort through thousands of forums, workshops, special events, and much more for EAA AirVenture Oshkosh.

Read More

Multiple Venues

With more than 1,600 acres and 26 venues to choose from, we are sure to show you a space that will make your vision come to life. Our unique atmosphere is sure to offer a one-of-a-kind experience for your guests.

Read More

Multiple Venues

With more than 1,600 acres and 26 venues to choose from, we are sure to show you a space that will make your vision come to life. Our unique atmosphere is sure to offer a one-of-a-kind experience for your guests.

Read More

Spirit of Aviation Mobile Experience

We promote a culture of education, safety, and camaraderie and provide you with opportunities to enjoy aviation, no matter what your level of interest.

Read More

EAA Sport Aviation

One of EAA’s most popular member benefits, the award-winning monthly magazine covers the full spectrum of association activity.

Read More

Aviation Job Search

Whether you’re looking for a job in the industry, wondering what careers are available, or just looking for a professional change of pace, you’ll find that there is a job to fit every unique person.

Read More

Scholarships

EAA’s scholarship program encourages, recognizes and supports excellence among those studying the technologies and the skills of aviation. These annual scholarships help outstanding students who demonstrate financial need to accomplish their goals.

Read More

This Month's Wallpaper

Your computer takes flight each month when you download desktop wallpaper featuring unique aircraft and vivid imagery. Download your favorite today!

Read More

B-17 Tour Stops

Join us for an unforgettable experience aboard one of the few remaining airworthy B-17s in the world. You won’t want to miss Aluminum Overcast when it visits an airport near you!

Read More

Tri-Motor Tour Stops

Climb aboard one of the first mass-produced airliners and step back in time to aviation’s golden age. A flight on EAA’s Ford Tri-Motor is a flight back to an era where air travel was considered a luxury.

Read More

Visit Pioneer Airport

From May through October, Pioneer Airport gives visitors a unique “living history” re-creation of what airports were like during the early days of air travel. It brings back a time when the magic of flying astounded and charmed the whole world. 

Read More

Your Flight Experience

The biggest question on your mind might be, “So what should I expect on my flight?” Get a glimpse at what you’ll experience when you take your EAA Eagle FlightTM.

Read More

Your Flight Experience

The biggest question on your mind might be, “So what should I expect on my flight?” Get a glimpse at what you’ll experience when you take your Young Eagles® flight.

Read More

News Releases

Get all the official news surrounding EAA and its programs.

Read More

Paul Poberezny

Paul Poberezny came from humble beginnings, yet he emerged as one of the 20th century's greatest aviation leaders, creating a worldwide aviation organization and the world's largest annual fly-in event, EAA AirVenture in Oshkosh, Wisconsin.

Read More

Tribute Opportunities

Special places like the museum’s Founders Wing and other campus tribute areas like the Brown Arch, Compass Hill, and Memorial Wall combine to give wings to countless aviation dreams and accomplishments. Leave your legacy or that of your loved ones for all who visit Oshkosh to see.

Read More

Win a brand new Van's RV-12!

This is your chance to win a beautiful, brand-new Van's RV-12. This striking aircraft, painted Tahoe Blue, will remind you just why you love to fly. Enter now to win!

Read More

Advertise in Sport Aviation

EAA Sport Aviation contains the broadest editorial content and coverage for recreational aviation today - introductions to new aircraft and innovations, the latest aviation products and services, hands-on and personal experience in the nuts and bolts of aircraft ownership, and so much more.

Read More

Why Exhibit?

AirVenture enables our commercial partners to have an unmatched forum to present their products and services to the most passionate aviation consumers.

Read More

Volunteer

Join us and be a part of this tradition of excellence, while helping us continue to provide high quality programs and services to our members and visitors.

Read More

Outreach Guidelines

EAA's Community Outreach Guidelines to help coordinate and maximize offerings by providing a defined approach to responding to requests for support of community events; developing a fair and easy process to identify, evaluate, and support efforts of the non-profit community; and developing a process that allows for tracking and quantifying impact.

Read More

HOMEBUILDERS

Dream It. Build It. Fly It.

A tradition that began with the Wright brothers continues today with you. The art of building an aircraft is the stuff of dreams. Until, that is, you build it and take to the sky.

Swinging The Compass

By Tony Bingelis (originally published in EAA Experimenter, March 1996)

With a loran and handheld GPS onboard, who needs something as old fashioned as the "whiskey compass"? Who? Why, you do, of course, amigo.

Sorry to downplay the awesome accuracy of your new miracle nav-aids but our omnipotent FAA, in effect, mandates through its FAR 91.33 that you have a functioning magnetic direction indicator (compass) onboard for VFR flying. Even for plain ol’ VFR flying? Yup! Regardless of any other fancy directional equipment you may have.

Not only that, but your compass must be accurate enough that it won’t lead you astray because of misleading or excessive deviation errors.

This means in level flight your compass deviation error must not be greater than 10 degrees on any heading. I guess even the FAA concedes that holding a compass heading within 10 degrees in rough air is a challenging enough accomplishment for most pilots.

Anyway, your compass is a mandatory and useful instrument. For one thing, the compass will always be working for you - which is more than you should ever expect of any of your hi-tech electronic gadgets . . . like the loran or GPS.

Electrical systems do fail . . . not often maybe, but they do fail while the earth’s magnetic field never does.

So, if you have to have a compass, you might as well become better acquainted with it and give it a bit more of your attention and a lot more of your trust.

Sure, that simple inexpensive "whiskey compass" may act dizzy at times or behave oddly when flying over localized areas of magnetic disturbance, but the actual failure of a compass is rare . . . very rare indeed.

About That Compass In Your Cockpit
That small liquid, or vertical card, compass most of us have in our cockpit can be temperamental. It is affected magnetically by the proximity of steel objects, including the engine, electrical wiring, welded steel tubular structure and, in particular, most similar metallic objects you might absentmindedly lay on the glareshield in the windshield area.

Compass

The most effective cockpit location for a compass is in the open areas of the windshield . . . as far removed as possible from steel parts and other disturbing influences. That’s why you ordinarily see the compass mounted up front where its presence will be, hopefully, at least as practical as it is obnoxious.

Sometimes, but not as often, a compass can be successfully installed in an aluminum instrument panel provided the structure behind and around it is not likely to be a source of magnetic or electrical disturbances.

Trying to find a magnetically neutral location in a welded steel fuselage is a difficult, often impossible, task for homebuilders as well as for owners of some older certificated aircraft.

Sometimes the latent magnetism is so bad that getting rid of it completely is often unsuccessful in spite of the best aircraft degaussing efforts a builder might attempt. That is why in some small biplanes the compass if installed in the upper wing cut-out directly above the cockpit.

Anyhow, sooner or later your airplane will be flying around with a compass onboard, somewhere.

To obtain the greatest accuracy from that compass you should determine the extent of its deviation errors and eliminate, or at least minimize, them by swinging the compass.

It is not a difficult task at all. All you need is access to the airport’s Compass Rose, and to a small non-magnetic screwdriver with which to make corrective screw adjustments. These adjusting brass screws are located in the top or bottom of the compass face and are the means used to correct the magnetic alignment of the two small built-in compensating magnets . . . should this be necessary.

In essence, this simple ritual is called "swinging the compass."

When and Why You Do It

Your first encounter with a newly installed compass will probably be to check its operation prior to the initial aircraft certification. Thereafter, the compass should be checked during its Annual Condition Inspection or at anytime new electrical equipment is installed in the panel or cockpit area.

Before you attempt to determine the accuracy of your compass you should check its fluid level. The fluid level is important as it helps damp out oscillations of the internal compass card and lubricates the pivot bearings. If necessary you can add Compass fluid (Mil-C-7020, not alcohol or kerosene) by removing the large top plug.

If your compass is mounted on top of your glareshield, you can refill it without removing it from the airplane. Otherwise, you will have to pull it from the panel for the job. For obvious reasons you should use brass mounting screws to install the compass.

As you already know, this so-called swinging the compass procedure is necessary to determine how to compensate the compass in the event that its location in the cockpit is affected by the proximity of steel or iron components or by the effects of current flowing in nearby electrical circuits.

Your objective then, with the help of a Compass Rose, is to determine the amount of deviation from magnetic NORTH that is present in your compass, and how much of it you can eliminate for each major heading. These results are then entered on a compass correction card.

The Compass Rose
Many airports will have a Compass Rose or something that will pass for it, painted somewhere on the ramp or taxiway. It is usually located away from the possible metal interference of hangars, fuel pumps and anything else which could affect a compass.

The simplest Compass Rose most often seen at a small airport is not usually a very impressive display. It will probably have four intersecting lines painted on the taxiway or ramp to designate the four cardinal magnetic directions (N, S, E, and W). These directions are laid out with the aid of a master compass.

A more elaborate version of a Compass Rose may have additional lines painted and labeled to designate intermediate 30 degree headings.

The most elaborate Compass Rose I have ever seen is the one recently completed at the municipal airport at Burnet, TX by Carol Foy. She is one of the talented members of the Austin, TX Chapter of the 99s.

It is worth the flight out to Burnet’s fine airport just to see and use this Compass Rose . . . besides, the folks are friendly and the 100LL Avgas is currently dispensed for only $1.65 per gallon

Here's How You Do It
To be accurately accomplished, the compass should be swung under conditions similar to those encountered in flight. In other words, the engine should be running, the radios should be on, and the aircraft in a level flight attitude.

Compass

The reason for the simulated level flight attitude is because the magnetic bars on the compass card attempt to parallel the earth’s magnetic lines of force.

Note: For example, when a taildragger is on the ground, the nose of the aircraft points skyward causing magnetic bars and the compass card to tilt in an attempt to remain aligned in the same direction as the earth’s magnetic lines of force. The resulting magnetically induced dip causes the compass card to swing slightly, giving an erroneous indication. A taildragger, therefore, should be chocked with the tail raised to approximate level flight attitude . . . the job is much easier when two people are involved.

Here’s the basic procedure:

    1. Taxi the airplane into position onto the Compass Rose with the nose aligned with the NORTH magnetic reference line of the Compass Rose. Adjust the N-S screw with a non-magnetic screwdriver so that the compass reads exactly NORTH (0 degrees).

    2. Next, realign the aircraft on the Compass Rose with the nose pointing in a magnetic EAST direction. Adjust the E-W screw until the compass reads EAST (090 degrees) exactly.

    3. Turn the aircraft to a magnetic SOUTH direction and note the resulting SOUTH error . . . if any. Readjust the N-S screw until you have removed one-half of the error.

    4. Next, head the aircraft so it points to a magnetic WEST direction. Readjust the E-W to remove one-half of the E-W error.

    5. Finally, turn the aircraft to successive 30 degree headings and record the resultant readings on your compass correction (deviation) card.

The Compass Correction Card
A Compass Correction Card is normally affixed to the instrument panel adjacent to the compass. In the past, FAA inspectors seldom missed the opportunity to point out to the anxious builder, during his certification inspection, that he still lacked a Compass Correction Card. Although the inspector rarely withheld the issuance of the Airworthiness Certificate, for that reason alone he would point out the need for the builder to swing his compass before he would be ready to test fly his airplane. Embarrassing though it may have been, it was generally conceded to be an easy thing for the first-time builder to forget and overlook.

A blank standard Compass Corrections Card may ordinarily be obtained free-of-charge from an instrument shop or more often at one of the major fly-ins (Oshkosh, Sun ’n Fun, etc.).

If you can’t obtain a regular Compass Correction Card, make your own. Actually, making your own can be advantageous because you can arrange it so it can be mounted horizontally or vertically. This depends, of course, on the space available for posting it near your compass.

It is well to remember to keep metal objects such as key chains, tools, fingernail clippers, etc. off your glareshield - and away from the compass as they, too, can contribute to erroneous compass readings.

The Final Results
How did we make out? Pretty good. That RV-6A compass was off only 3 degrees on N, and just about zeroed in on the S heading . . . well within the allowable 10 degree margin acceptable to the FAA.

Now, that blank compass card on the panel can be filled out with good conscience, and with the added assurance of knowing that my compass is far more accurate than I hoped it would be.