def getCbsdsNotPartOfPpaCluster(cbsds, ppa_record):
    """Returns the CBSDs that are not part of a PPA cluster list.

    Args:
      cbsds : List of CBSDData objects.
      ppa_record : A PPA record dictionary.
    Returns:
      A list of CBSDs that are not part of the PPA cluster list.
    """
    cbsds_not_part_of_ppa_cluster = []
    # Compare the list of CBSDs with the PPA cluster list
    for cbsd in cbsds:
      if cbsd['id'] not in ppa_record['ppaInfo']['cbsdReferenceId']:
        cbsds_not_part_of_ppa_cluster.append(cbsd)

    return cbsds_not_part_of_ppa_cluster