The Airframe Handbook is the basis for the part 147 written test. Written in 1972 and updated in 1976, the "15A" is lacking only in modern systems and electronics.
Airframe and Powerplant Mechanics: General Handbook
This is designed to serve as a guide for students enrolled in a formal course of instruction, as well as the individual who is studying on his own.
Airframe and Powerplant Mechanics: Powerplant Handbook Index
Published in 1970, updated in 1976, the Powerplant Handbook is used as a supplemental text for the section. Good on big radial engines, the "12A" is a bit short on turbine engines.
Airframe and Powerplant Mechanics: Airframe Handbook Index
This FAA reprint provides the textual material needed to study this mechanic rating. It is the document from which the FAA tests are drawn. Effective 1976; includes Change 1 03/31/99.
Airframe and Powerplant Mechanics: General Handbook Index
Airframe and Powerplant Mechanics: General Handbook with Index