Document Type: Operations Handbook and Manual Authority: Manufacturer (authoritative reference) Document Number: Publication No. 23-117

From the Introduction: “This pocket handbook is intended to serve as a reference for operating and ground maintenance personnel when using any model of the Sperry Engine Analyzer. It contains a general description, principles of operation, the required component adjustments, synchronizing generator timing methods, and operating information. Representative ignition and vibration patterns are included for various engines and ignition systems, with descriptions of these patterns and the probable causes of malfunction indications.

The Engine Analyzer is manufactured by Sperry Gyroscope Company, Division of The Sperry Corporation, Great Neck, New York in two general types, one for permanent installation in airplanes, the other, a portable system for transient use.

The Engine Analyzer provides continuous visual analysis of the complete power plant. It not only detects, but also locates and identifies the malfunctions and imminent failures that occur during engine operation. It is used either in the aircraft during flight or on the ground. It reveals and locates all of the common ignition malfunctions, as well as vibrational mechanical malfunctions, such as detonation, sticking valves, valve bounce, valve clearance, and piston failure. With this knowledge available in the aircraft, the flight engineer can evaluate the seriousness of a trouble and adjust his engines properly for optimum performance. The flight captain can revise his flight plans accordingly. Moreover, with the identity and location of trouble definitely established before landing, the ground crew, instead of having to spend time searching for the cause of a malfunction, can concentrate on correcting it immediately after arrival of the aircraft. In addition, since the Engine Analyzer can spot troubles which occur while flying at high altitudes, but do not occur on the ground, such information can be reported to the ground crew upon landing.”

Scope: Contents include sections on: Description, Principles of Operation, Installation Adjustments, Operations Procedures (Pre-flight checks, Ground Run-ups and In-Flight Procedures), Ignition patterns and Vibrations patterns.