hotwheels
Joined: 01 Jun 2007
Posts: 240
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 Posted: Sat May 03, 2014 2:18 pm Post subject: TruTrak AP Pitch Servo issue |
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I love my DigiFlight II VSGV, but recently experienced an in-flight loss of altitude command in my Pitch Servo. The only symptom of something wrong was lack of altitude hold (roll works fine).
After landing I powered the AP on back at the hangar and varied the altitude control to different +/- vertical speeds. The stick moved ever so slightly fwd and aft. No real force was required to override it manually even though the AP torque setting was at max).
After removing the baggage compartment bulkhead, I fully expected to see what a sheared off servo bolt looks like... However, it's still intact and looks fine. Closer inspection showed nothing unusual with the servo arm, fittings, cable, phenolitic wheel (sp?) pitch tube or wires.
The servo acted like it was trying to move the pitch tube (things were clicking), nothing was happening. I watched the servo running and noticed a loose factory set screw where the blue motor housing attaches to gold base.
Yikes! I'll be calling TT Monday first thing Monday and will report on how this turns out. Guess I'll be adding add a visual/physical inspection of the blue servo motor housing to my annual checklist.
Cheers,
Jay
433RV
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