MIL-HDBK-704-4, DEPARTMENT OF DEFENSE HANDBOOK: GUIDANCE FOR TEST PROCEDURES FOR DEMONSTRATION OF UTILIZATION EQUIPMENT COMPLIANCE TO AIRCRAFT ELECTRICAL POWER CHARACTERISTICS SINGLE PHASE, VARIABLE FREQUENCY, 115 VOLT (PART 4 OF 8 PARTS) (9 APR 2004)., 2. This handbook provides guidance on test procedures for demonstration of single phase, variable frequency, 115 volt utilization equipment to determine compliance with the applicable edition of MIL-STD-704. MIL-HDBK-704-4 is Part 4 in a series of 8 Parts. Part 4 describes the test methods and procedures to demonstrate that single phase, variable frequency, 115 volt utilization equipment is compatible with the electric power characteristics of MIL-STD-704. These series of handbooks and MIL-STD-704 are companion documents.