I can't comment on the legality of doing this yourself, but I will tell you how to correct a small error in the baro pressure vs. altitude reading.
On almost all altimeters, just adjacent to the Kolisman window adjustment knob, there is a small flat blade screw head. Unscrew this until the head will easily clear the face plate of the instrument. Adjust the knob for correct field altitude. Pull out on the screw head and slide it sideways away from the knob (usually left and slightly up). This will unlock the knob and allow it to be pulled outward toward you. This disconnects the knob from the moving the altitude reading while allowing it to independently adjust the baro reading. Turn the knob and adjust the pressure reading to current field baro pressure. Then push the knob back in re-locking the pressure and altitude readings together and then re-lock the knob by sliding the screw head toward the knob and screwing back flush with the instrument face. It is perfectly normal for the correlation between the pressure and altitude readings to become de-sychronized by small amounts. If the altimeter is and has been working well, this re-adjustment is harmless and can save you a lot of money during your transponder check. The blind encoder does not have this correlation problem since it provides pressure altitude only (same as you setting the altimeter to 29.92. It's output is in steps of 100 ft. The ATC computers add in the differential for local pressure (which we all know is ALWAYS accurate). If you maintain the correlation on your altimeter, you are less likely to have the excessive difference in the two which requires a re-calibration. Dick -----Original Message----- From: Dennis Spiegel <[EMAIL PROTECTED]> To: [email protected] <[email protected]> Date: Wednesday, January 12, 2000 2:50 PM Subject: [COUPERS] altimeters hello to all Ihave a altimeter that was tested along with my encoder and transponder it was noted that my altimeter was reading 100 or so feet light but within regs for VFR flight I'd like to fix or replace it what is generally the best route from all angles fix or replace either way i'm grounded without it in the plane. which is the easiest to do have it removed and fixed or send out to replace.Or wait for oshkosh or something or what. Oh or keep the old one and buy a rebuilt one or a new one .What do you'all think is a good route. dennis 99564 windy northern Ill __________________________________________________________________________ __ ____ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Keep up with breaking news! Join our Hot Topics list. http://www.topica.com/lists/breakingnews/t/12 --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] _____________________________________________________________ Check out the new and improved Topica site! http://www.topica.com/t/13
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