ANUAL, ILLUSTRATED PARTS LIST, AND WIRING DIAGRAM MADATAL - ATA CHAPTER 49; GARRETT AIRESEARCH AUXILIARY POWER UNIT MAINTENANCE MANUAL 49-21-89 FOR MODEL GTCP36-1CCG; GREYHOUND CORP. API SURGE VALVE CONTROL MODIFICATION ELECTRICAL CHG. No. 49122489, dated 12-24-89, see D€ APPROVED FAA Form 8110-3 dated January