  Perturbations of Kantowski-Sachs models with a positive cosmological constant
are considered in a harmonic decomposition, in the framework of gauge invariant
1+3 and 1+1+2 covariant splits of spacetime. Scalar, vector and tensor modes
are allowed, however they remain vorticity-free and of perfect fluid type. The
dynamics is encompassed in six evolution equations for six harmonic
coefficients.
