FER TO: FAA APPROVED STC No. SA111NE, dated November 24, 1982; GAC. Maintenance Manual ATA Chapter 49; Garrett Turbine Engine Company, INSTALLATION HANDBOOK AIRBORNE AUXILIARY POWER UNITS, TURBINES 31-0251A Second Edition. e>33 -... The purpose of this ?Iteration is to provide a separate sourc - cooling air inlet that is entirely s