New Avionics Bus and Master Switch for Cessna 637 (plus a couple of other improvements)

Sep 14 2012

We recently did a number of improvements to N61637, our 1975 Cessna 172M.

The most immediately noticeable to pilots is the installation of an avionics master switch. This may sound a simple thing, but it is not. To do it, the electric bus had to be split in two and all avionics connected to the second one, behind the new switch. Many hours of work, hanging upside down under the panel, was needed.

Pilots now just need to turn the avionics master on and off, it is no longer necessary or even recomended to turn each radio on and off separately.

Please remember, NEVER turn the avionics master on before the engine is started, and ALWAYS turn it off before the engine is shut down! See also the article on alternator problems.

In addition to the avionic work, we took the opportunity to rebuild the nosewheel strut assembly and also to install a new flap motor.

A big “Thank you” to Victory Aero for doing the work so quickly.

As always, do remember to check the AeroDynamic Aviation web site regularly. We recently added more Pilot Operating Handbooks to our “Useful Documents” section