  We report on the first focused hard X-ray view of the absorbed supergiant
system IGRJ18027-2016 performed with the NuSTAR observatory. The pulsations are
clearly detected with a period of $P_{spin}=139.866(1)$ s and a pulse fraction
of about 50-60% at energies from 3 to 80 keV. The source demonstrates an
approximately constant X-ray luminosity on a time scale of more than dozen
years with an average spin-down rate of $dP/dt\simeq6\times10^{-10}$ s/s. This
behaviour of the pulsar can be explained in terms of the wind accretion model
in the settling regime. The detailed spectral analysis at energies above 10 keV
was performed for the first time and revealed a possible cyclotron absorption
feature at energy ~23 keV. This energy corresponds to the magnetic field
$B\simeq3\times10^{12}$ G at the surface of the neutron star, which is typical
for X-ray pulsars.
