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1. 10:05 AM - Mixture Control Operation (Terry Moushon)
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| Subject: | Mixture Control Operation |
Mixture control operation
RV10 =93 480 hours
Engine =93 VANS Lycoming YIO540-D4A5
Mixture Control Cable =93 VANS Standard Red Vernier RV10 Cable, instal
led as per instructions
Fuel Injector Servo =93 Brand: AVSTAR Model: AUX5VA1, MFG Date 2014
Overtime my mixture control cable resistance has increased. I have been fly
ing since May 2016 and while I had forgotten how it operated when new, I fel
t something needed attention. I disconnected the cable from the mixture con
trol arm and found the cable to be in great shape, operating very smoothly.
Next, I operated the mixture control arm moving it from Full to ICO. Felt g
ritty and took 11-13 in/lbs to operate.
I called AVSTAR seeking guidance and was put through to Rene (Experimental T
ech). After sharing my observations, Rene asked me to remove it and send it
to his attention. It arrived at AVSTAR on a Thursday morning and was shipp
ed back before they left Friday.
Upon its return, I took note that the mixture control arm movement was very s
mooth. I reinstalled the fuel servo with the new gasket they supplied and f
lew. They had successfully returned the unit to like new operation.
Yesterday, Eric (AVSTAR manager) gave me a follow up call to see how things w
ere going. I now have 15 hours on the fuel servoand is genuinely g
ood as new.
Final thoughts.
Mixture controls should operate smoothy and we should revalidate full travel
. I did when installed, and at each annual. Increased resistance can restri
ct the mixture control from achieving full operation.
AVSTAR welcomed my observations, understood the gravity of the situation, an
d provided a workable solution.
Terry
RV10 N563EA
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