CSOBeech - Flap Degree Decal Placement


20 Degree Flap Decal Placement Instructions
Do you have an unlimited choice in flap positions for your Beechcraft? If your system is like mine, you have a flap handle with UP, DOWN and center OFF detents allowing the pilot to stop the system manually without a flap position indicator? Well, here is the Beech Factory Flap decal that can help you identify how many degrees of flaps you have engaged: Beech P/N 35-000066B/C = Black over Clear Beech P/N 35-000066W/C = White over Clear The above picture is the Black over Clear version. Here is the way to install your flap decal on your flap per Old Bob, Beechcraft maven and ancient aviator: Sit in the pilots seat adjusted for your normal in-flight position. Look back over your left shoulder and run the flaps down until you can see just one half of the large (Inch and a half diameter?) washer that is on each side of the track. When it is half exposed, you are at ten degrees. *Co-pilot Side View Pilot Side View* What about twenty flap? Here is how we do that. Just roll in full right aileron. That will put the left aileron down twenty degrees (provided of course, that the ailerons are properly rigged). Line *up the flap until the top surface of the flap is parallel to the top surface of the aileron and you will have twenty degrees of flap extended.* There you have it. You're ready to spiff up your flap(s) with a nice factory decal to tell you where you're at on flap position. Of course, if it's pitch black dark outside you're back to the old time count. "Roll Your Own" With Help From Pics Here is Dr. Dave Rogers method for measuring your flap deflection: You can easily measure the actual deflection either with one of the inexpensive electronic angle gauges or simply by using two 1/5 x 30" straight sticks a couple of spring clamps and a protractor. Simply hold the sticks together, lay them on the wing about 5" out from the fuselage and align each of the sticks with the wing and deflected flap. Clamp the sticks together, carefully remove, draw a line along the edge of one of the sticks onto the other and measure the inclination of the line with the protractor or better yet a digital level/protractor. "Be aware that because of the way the wing is built that the actual measured deflection is different depending on where you measure. You can see this using a digital inclinometer at various locations along the flap." "For the flight tests, I measure, and specified, the deflection at 5" outboard of the fuselage mid-chord on the deflected flap compared to the inclination of the wing trailing edge at that point." Here's Dr. Rogers' images to demonstrate the way to use the digital level/protractor on the flap: Top of wing - Set Zero On Flap - Take Reading and make appropriate markings on flap and/or indicator. Now when you want 10 degrees of approach flap or 15 degrees of flap for a short field takeoff, you'll have a good way of knowing (at least in daylight) where your flaps are positioned. Here's my view from my office Flap Bumper Repair Kit Does your flap rattle or vibrate in flight in the full up position? Beech Kit #95-4001-1 is designed to give you the little pieces and a rubber bumper to be placed in the airframe for the flap to come to rest on. Thanks to Beech Lister Jim H., here are the pics of the parts list for Kit #95-4001-1 and the Beech Service Letter 65-40 that describes the installation of the kit. Here are his pics on his F35 Bo. Here are Jim's comments: "The kit is installed on the outboard end of each flap. Picture 1 is taken from beneath the flat look up and outboard. Picture 2 was taken from above the flap looking forward and slightly outboard. The end of the left aileron can be seen in both pictures. The kit was installed per Beech's instructions with little or no problems. The biggest hassle was removing the aileron, that's a must, flap doesn't have to be removed. Flaps are now nice and snug when retracted." Pic #1* Pic #2* SPECIAL NOTE regarding the pics above: I am told by an experienced IA that the pic above displays an INCORRECT flap bumper installation. The bumper should be installed on the rib, NOT the sheet metal where it is shown attached. The attachment position depicted above can result in damage to the leading edge of the flap as well as the sheet metal where the bumper is attached. Below is a DIY Bumper Solution The screw is an 8-32 x 1.25"L which threads into the original rivnut, if it has not been corroded beyond use. If you have to replace the rivnut, it's a tedious "building a ship in a bottle" experience . Don't ask me how I know! *The Bumper can be found HERE** You will use safety wire pushed through the two rivet holes that you have drilled out. Then you wrap the safety wire ends around the rivnut holes to gently pull it into position on the back of the rib. Then you delicately thread the 8-32 screw into the rivnut to pull it into place. Then pull your safety wire off the rivnut. Now use an awl to align the rivnut holes with the rivet holes. Then pull your first and then second rivet. Congratulations! You are done. (If this roadmap has helped you with this hair pulling project, please consider a donation to the site.) Please Donate to Keep CSOBeech.com Free* On average, CSOBeech serves up over 650 pages of content each day and only a minuscule portion of our visitors donate. If each visitor gave only $1 a month, we could keep CSOBeech thriving for years to come. The price of a few cups of coffee per year would be greatly appreciated. It’s your generosity that keeps me motivated to keep CSOBeech content current and confirms to me that the investment of my time in the site matters to you. Your donation will insure that CSOBeech is here for you when you need it. I hope you’ll think about how valuable it is to have unlimited access to the information in CSOBeech.com. In honor of our 17-Year Anniversary, please consider a $10 donation for your annual access. Thank you. CSOB1 with A&P approval Click the pics below for a full size image of the Service Letter: Click HERE for more flap system info.