The accurate knowledge of the beam profiles is a prerequisite for the calibration of extended sources of centre point source observations. It is not possible to cover all filter/aperture combinations to assess the beam profile shape. For this programme we perform the following filter aperture combination: 11.5 micron / 52" We will scan the aperture in Y and Z using a point source (star) in order to determine the aperture profile for the two combinations History 11/02/98 Creation database for 52" scan (RJL) Must be executed on rev 842 because of fixed position angle 11/03/98 Update for revolution 867 (TM) see also P1BEAM01