Columbia Aviation Association is located at the Aurora State, Oregon Airport (UAO).  CAA was founded in 1949 as a private organization devoted to flying.  After being located at the Portland International Airport (PDX) for forty five years, members completed the beautiful new Aurora clubhouse in 1996.  Membership is by invitation only and requirements include possession of a private pilots certificate.  Most of the club's 260 members have advanced ratings and are aircraft owners who fly on a regular basis for business and pleasure.

Regular meetings are held every Thursday evening from 6:00pm to 9:30pm with a social hour, dinner and a guest speaker.  Special events are held quarterly and there are breakfast flyouts on Sundays.  BBQs and brunches are scheduled at the clubhouse during the year to engage in our favorite past-time of hangar talk. 

Each year members organize several cross-country flying trips provide members and their families an opportunity to participate in exploring the USA and abroad.  Recent destinations have included Jackson Hole, Joseph, San Juan Islands, Sunriver, SunValley, Victoria BC and Silverton Colorado.

Whether it is attending the weekly meetings, participating in the annual Flight Profile pilot training program, attending a major dinner event, participating in aviation related issues and projects or flying across the country together, the Columbia Aviation Association members share a rich camaraderie based on the love of aviation and  flying…


Upcoming Thursday Programs

D. Darwin Stout Regional Sales Director Pacific Northwest Embraer Executive Jets
May 25 @ 5:30 pm – 7:30 pm

D. Darwin Stout

Regional Sales Director

Pacific Northwest

Embraer Executive Jets<http://www.embraerexecutivejets.com/>

Going over the best-selling new business jet in the world!


Po Boy Night

Pulled Pork & Smoked Brisket Sandwiches

Condiments: BBQ Sauce, Cheese Onions, Mayonnaise & Jalapenos

Baked Beans


Tossed Green Salad with House Dressings & Homestyle Croutons

Fresh Baked Bread


Facility Rental Mary Schu
May 27 @ 8:00 am – 5:00 pm

IFR Training Class

Bruce Bennett & Tim Warren – Rich or Lean of peak?
Jun 1 @ 5:30 pm – 9:00 pm

The eternal debate of running an engine Rich of Peak or Lean of Peak (Exhaust Gas Temperature) EGT will be addressed in this discussion.

CAA members Bruce Bennett and Tim Warren will present opposite points of view on ROP and LOP.

The default is to run 50 to 100 degrees Rich of Peak EGT.   The ideal fuel to air ratio for best engine performance is 14.5 pounds of air for 1 pound of avgas.  13 to 1 is typical for rich of peak; 16 to 1 is typical for lean of peak.

Why run Rich?   To keep the valves and cylinder temperatures at safe operating temperatures.  The extra fuel does not burn; it evaporates to help cool the internals.  But, this reduces maximum engine efficiency and can result in 10% or more fuel purchased than needed, amounting to a lot of money over time. Some earlier military piston engines utilized water injection which provided the desired cooling effect in high power takeoff and combat situations while allowing the ideal fuel to air mixture for maximum engine performance. 

Due to fuel cost savings and possible better engine performance, several advocates of Lean of Peak have made their points in recent years.  They claim that LOP settings allow air to provide the necessary cooling.  But, the traditional approach is to play it safe and keep the temps under control by running rich of peak to allow extra fuel to provide the cooling.

This raises many questions.  Can Lean of Peak be safely done on a carburetor engine? Or, does the engine require GAMI fuel injectors?  Are individual cylinder probes necessary?  What does the POH recommend?  And, on a related topic, what is the proper procedure for leaning at high density altitude airports? (for takeoff, approach, go around)

Is LOP practical only in cruise and at 75% power or less?  Can only the rich afford to run Rich?  Why way do you Lean on this issue?  Attend and join in with the lively discussion. 

AOPA Dogfight article        General Aviation News article

Board Meeting
Jun 8 @ 5:30 pm – 7:00 pm
Jenifer Stevens- Embry Riddle- Member/Daughter Dinner
Jun 8 @ 7:00 pm – 9:00 pm