  Chandra images show symmetric, 8 kpc long, arm-like features in the X-ray
halo surrounding NGC 4636. The leading edges of these features are sharp and
are accompanied by temperature increases of ~30%. These properties, along with
their scale and symmetry, suggest that the arm-like structures are produced by
nuclear outburst driven shocks. We interpret these observations as part of a
cycle in which cooling gas originally fueled a nuclear outburst about 3 X
10^{6} years ago leading to shocks that reheat the cooling gas, thus preventing
the accumulation of significant amounts of cooled gas in the galaxy center and
temporarily starving the central AGN.
