This Lycoming Operator's Manual was produced for the installation and maintenance of the Lycoming Model VO-435-A1B And A1D Helicopter Engine.  In addition to a warranty coverage statement and a note about the warranty, this operator's manual includes the following sections: 1) Introduction; 2) Specifications; 3) General Description; 4) Packing and Unpacking; 5) Installation; 6) Operation; 7) Service Inspection and Maintenance; 8) Engine Troubles and Their Remedies; 9) Service Table of Limits; 10) Torque Limits; 11) Horsepower-Altitude Equivalents; 12) Table of Speed Equivalents; 13) Centigrade-Fahrenheit Conversion Table and 14) Inch Fraction Conversions.  In addition to the narrative and specification tables, this operators manual includes 2 black and white photographs and 4 black and white illustrations.  This Lycoming Operator's Manual is 52 pages and is in very good condition.  Note: this item has the original owner's name on the manual cover and first page.  Fourth edition published in March, 1959.