Sperry Aircraft Gyropilot Model A-3 Instruction Manual 1940 Armée de l'Air A cool WWII-era aviation navigation

A cool WWII-era aviation navigation artifact indeed

By loosening the small retaining lever

This is a WWII-era Aircraft Navigational Protractor (aka Aircraft Plotter) Kit as used in navigator-crewed aircraft of the US Army and Navy

The US Army part number 6208454 and GMC part number AC1567470 appear on the face of the instrument

as used in versions of the German Luftwaffe jet aircraft Me 262

Sperry Aircraft Gyropilot Model A-3 Instruction Manual 1940 Armée de l'Air A cool WWII-era aviation navigationThis 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