  A class X1.5 flare started on the solar limb at 00:43 UT on 21 April 2002,
which was associated with a CME observed at 01:27 UT by LASCO C2. The
coordinated analyses of this flare include TRACE 195 {\AA} images and SUMER
spectra in lines of Fe XXI, Fe XII, and C II. We find that: 1) The flare began
with a jet seen by TRACE, which was detected by SUMER in the C II line as a
strong brightening with blue shifts up to 170 km s$^{-1}$. At that time only
weak emission was detected in Fe XII and Fe XXI. 2) Subsequently, a weak
looplike brightening started south of the jet, moving outwards with an average
speed of about 150 km s$^{-1}$. The SUMER spectra responded this moving loop as
separatingly brightenings, visible only in the Fe XXI line. The southwards
moving component contains red- and blue-shifted emission features and has an
apparent speed of $\sim$120 km s$^{-1}$. The absence of signatures in Fe XII
and C II lines indicates that the moving weak loop seen by TRACE corresponds to
the emission from very hot plasma, in a blend line in the 195 {\AA} bandpass
due to Fe XXIV formed at T > 10 MK. 3) The trigger mechanism of the flare and
associated CME can be interpreted in the same way as that proposed by Wang et
al. (2002) for an event with similar initial features.
