  Energy levels, radiative rates and lifetimes are calculated among the lowest
98 levels of the n <= 4 configurations of Be-like Al X. The GRASP
(General-purpose Relativistic Atomic Structure Package) is adopted and data are
provided for all E1, E2, M1 and M2 transitions. Similar data are also obtained
with the Flexible Atomic Code (FAC) to assess the accuracy of the calculations.
Based on comparisons between calculations with the two codes as well as with
available measurements, our listed energy levels are assessed to be accurate to
better than 0.3%. However, the accuracy for radiative rates and lifetimes is
estimated to be about 20%. Collision strengths are also calculated for which
the Dirac Atomic R-matrix Code (DARC) is used. A wide energy range (up to 380
Ryd) is considered and resonances resolved in a fine energy mesh in the
thresholds region. The collision strengths are subsequently averaged over a
Maxwellian velocity distribution to determine effective collision strengths up
to a temperature of 1.6x10$^7$ K. Our results are compared with the previous
(limited) atomic data and significant differences (up to a factor of 4) are
noted for several transitions, particularly those which are not allowed in jj
coupling.
