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Dave's RV-7A Builder's Log
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Date: 7-30-2017
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Number of Hours: 7.00
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Manual Reference:
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Brief Description: Installed pitot tube, secured wing wiring, added
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After giving some thought to the best method for securing the pitot/static tubing as it passes the aileron bellcrank, I started the day by tackling that process. I had seen a builder’s log where he had incorporated a simple bracket to hold the lines flush to the spar web as they passed under the assembly, so I decided to try that. I had an unused bracket from the flap assembly that was the perfect size and shape, so I modified that to fit on the two outboard bolts holding the bellcrank assembly. Lots of “off and on” tweaking later, I was satisfied that it would work. Next, after adding the nuts and ferrules, I flared the aluminum pitot/static lines and carefully bent them to clear the rib and head inboard for the junction with the plastic tubes. Since the pitot tube is heated, there must be at least 8” of aluminum tube before the assembly changes to the nylon tubing, so rather than cutting, I just used a little extra bend to take up the excess. This also helped with the alignment of the tubing and will keep things safely away from the aileron assembly.
Wiring was next, and after getting everything secured—to include adding an Adel clamp on the lower bellcrank bolt—I turned on the pitot heat to check it out. Success! Next I moved to the right wing and followed the same process, minus the pitot tube obviously, but now working around (and with) the roll servo to incorporate that wiring. Access in these underwing bays is not too bad, but the aileron servo presents a challenge since the wire harness attaches from the top and there is no way to adequately secure the forward screw (unless I remove the entire servo, which I’m not going to do) so I will add a safety wire to ensure security.
I finished up by installing the aileron stop on the left side. This turned into a multi-hour process due to the lack of any real detail in the plans for the actual location of the stop. I finally got it installed, but it required removing and reinstalling the aileron. Enough for one day!
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Pitot tube installed and heater tested
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Left wing pitot/static & wiring detail
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Left aileron stop
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