The Maryland Air National Guard (MDANG) requests for vendor to inspect the 150lb Halon Fire Bottle to ensure compliance with latest Time Compliance Technical Orders (TCTO) 13F4-4-501D.

Vendor  to  visually  inspect  Down  Tube  to  ensure  welding  has  not  failed.    Vendor  to  complete the manufacturer’s developed low pressure leak test to check serviceability of the down tube using low pressure nitrogen or clean air from a regulated source and applying a leak  detector  fluid.  Vendor  will  provide  a  Retrofit  Change  or  Inspection  Identification Marking  sealed 
 with  clear  epoxy  to  seal  it  from  the  element,  this  will  identify  the completion of the TCTO for the particular fire bottle.