Sperry Aircraft Gyropilot Model A-3 Instruction Manual 1940

This is an authentic reference Sperry Aircraft Gyropilot Model A-3, Instructions No. 15-728A dated December 1940. The Gyropilot was an early automatic pilot system developed by Sperry which quickly became the standard system for private, commercial, and military aircraft of the day and during early WWII.  This manual covers the 3rd generation of the Gyropilot: Model A-3, and its installation, operation, and maintenance. 

It is in reasonable condition for its age. The front and back cover pages have detached, but all 60 internal pages are intact and all in good condition. The front cover page has some deterioration at its bottom, see photo. Measures 8.5 inches by 11 inches.