  We present an analysis of off-limb cool flare loops observed by SDO/AIA
during the gradual phase of SOL2017-09-10T16:06 X8.2-class flare. In the EUV
channels starting from the 335 {\AA} one, cool loops appear as dark structures
against the bright loop arcade. These dark structures were precisely coaligned
(spatially and temporally) with loops observed by SST in emission lines of
hydrogen and ionized calcium. Recently published semi-empirical model of cool
loops based on SST observations serves us to predict the level of hydrogen and
helium recombination continua. The continua were synthesized using an
approximate non-LTE approach and theoretical spectra were then transformed to
AIA signals. Comparison with signals detected inside the dark loops shows that
only in AIA 211 {\AA} channel the computed level of recombination continua is
consistent with observations for some models, while in all other channels which
are more distant from the continua edges the synthetic continuum is far too
low. In analogy with on-disk observations of flares we interpret the surplus
emission as due to numerous EUV lines emitted from hot but faint loops in front
of the cool ones. Finally we briefly comment on failure of the standard
absorption model when used for analysis of the dark-loop brightness.
