AD FAA-2011-0687

We are adopting a new airworthiness directive (AD) for Diamond Aircraft Industries GmbH Model (Diamond) DA 40 airplanes equipped with cabin air conditioning vapor cycle system (VCS) installed per STC SA03674AT held by Premier Aircraft Services (originally held by DER Services, Inc.) following DER Services Master Document List MDL-2006- 020-1, Revision C, dated February 3, 2009; Revision D, dated April 22, 2009; Revision E, dated May 12, 2010; or Revision F, dated July 6, 2010. This AD was prompted by reports of damage around the VCS compressor mounting areas found during maintenance inspections. This AD requires deactivation of the VCS, removal of the compressor and bracket, and revision to the airplane weight and balance. We are issuing this AD to correct the unsafe condition on these products.