This SAE Aerospace Recommended Practice (ARP) describes standard methods of heat application to cure thermosetting resins for commercial aircraft composite repairs. The methods described in this document shall only be used when specified in an approved repair document or with the agreement of the Original Equipment Manufacturer (OEM) or regulatory authority. Purpose The purpose of this document is to provide a number of standard heat application methods that may be referenced in repair documents produced by airlines or airframe and engine manufacturers. This document is one of several in support of other procedures required to perform composite repairs@ intended for use throughout the commercial aircraft industry. These include AIR4844@ AIR4938@ AIR5278@ ARP4916@ ARP4991 and others incorporated herein.