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In a message dated 6/6/2002 11:51:17 AM Central Daylight Time, marv@lancaironline.net writes:
FWIW, I do a GUMP every time I let go of the PTT while in the pattern or on
approach.
Ed,
Thanks for the procedure and the thoughts. I do GUMPS on downwind, base and final. So, what went wrong? Maybe there is a hint in the following. After leaving Oklahoma and entering the mountains, I was at 12,500 (Density Altitude 15,000) sucking O2 with a 93% reading on my NONIN. I stopped at Santa Fe for several hours to get out of the high winds and turbulence (2 pm - 6 pm). SAF is at 6300 feet with a DA of 8500 (I think it was 31 degrees C). I made the 1.5 hour flight to Sedona at 10,500 with a DA of 13000. Now, I've been in the air for 7 hours (Chicago to Sedona), awake for 15, and stupidly failing to use the O2 available from the cannula resting on the passenger seat.
Since leaving home, I was recording flight/engine parameters (writing with my left hand) because I had finally balanced the inter-cylinder CHTs and EGTs and I was interested in performance on this trip. The writing from the beginning and also at the 1.25 hour point of the 2 hr flight from Ok to SAF were done with the usual clarity and detail, even during moderate turbulence. The writing done in turbulence .75 hours into the 1.5 hour flight SAF->SEZ (No O2) was large and child like in appearance. Was O2 deprivation a factor or was it the turbulence? I don't know since recovery is so quick, especially in lowering the plane's belly the last two feet onto the runway. I don't know since my deductive reasoning seemed to be working -- half-way during this leg, I noted that cyl #3 CHT was depressed and EGT was elevated. Five minutes and a recheck convinced me that I had a non-functioning plug in cyl #3 (fuel probably burning in the pipe). This was later confirmed when the cowling was removed and the bottom plug wire was hanging unconnected.
I don't know why I never looked for three green. I will wire up the verbal gear warning available from my Angle Of Attack device.
Scott Krueger
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