  We present preliminary results from the first X-ray gratings spectrometer
observations of a planetary nebula (PN). We have used the Chandra X-ray
Observatory Low Energy Transmission Gratings Spectrometer (LETGS) to observe
the bright, diffuse X-ray source within the well-studied BD +30 3639. The LETGS
spectrum of BD +30 3639 displays prominent and well-resolved emission lines of
H-like C, O, and Ne and He-like O and Ne. Initial modeling indicates a plasma
temperature T_x ~ 2.5x10^6 K and abundance ratios of C/O ~ 20, N/O <~ 1, Ne/O ~
4, and Fe/O <~ 0.1. These results suggest that the X-ray-emitting plasma is
dominated by the shocked fast wind from the emerging PN core, where this wind
gas likely originated from the intershell region of the progenitor asymptotic
giant branch star.
