  We have carried out a high spectral resolution line survey towards the Orion
Kleinmann-Low (KL) cluster from 44-188 um. The observations were taken with the
Long Wavelength Spectrometer (LWS) in Fabry-Perot mode, on board the Infrared
Space Observatory (ISO). A total of 152 lines are clearly detected and a
further 34 features are present as possible detections. The spectrum is
dominated by the molecular species H2O, OH and CO, along with [OI] and [CII]
lines from PDR or shocked gas and [OIII], [NIII] lines from the foreground M42
HII region. Several isotopic species, as well as NH3, are also detected. HDO
and H3O+ are tentatively detected for the first time in the far-infrared range
towards Orion-KL. A basic analysis of the line observations is carried out, by
comparing with previous measurements and published models and deriving
rotational temperatures and column densities in the case of the molecular
species. The complexity of the region requires more sophisticated models for
the interpretation of all the line observations.
