  We present AIA observations of a structure we interpret as a current sheet
associated with an X4.9 flare and coronal mass ejection that occurred on
2014~February~25 in NOAA Active Region 11990. We characterize the properties of
the current sheet, finding that the sheet remains on the order of a few
thousand km thick for much of the duration of the event and that its
temperature generally ranged between $8-10\,\mathrm{MK}$. We also note the
presence of other phenomena believed to be associated with magnetic
reconnection in current sheets, including supra-arcade downflows and shrinking
loops. We estimate that the rate of reconnection during the event was $M_{A}
\approx 0.004-0.007$, a value consistent with model predictions. We conclude
with a discussion of the implications of this event for reconnection-based
eruption models.
