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. Based on statistics of the actual science observations the key wavelengths are 7.3, 11.5 and 16.0 micron. Here: 16 micron/ 180" aperture 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 15/12/97 Creation database for 180" scan (RJL) 11/03/98 database entries for 16um/180" on HR7310 Must be executed on 31/03/98 (rev 867) because of fixed position angle