In this example, the radar control circuit of an
aircraft electrical system is analyzed to verify proper functioning of the
circuit. The analysis technique utilized is the sneak path analysis discussed
in Section 2.2
of the body of this
The sneak path analysis is composed of three basic steps.
Step 1: Converting the data base
Step 2: Pathfinding and development of
Step 3: Analysis of
Step 1 highlights documentation errors and application concerns, permitting
the correction of system documentation and improper applications. In Step 2, all
possible paths and system states are identified and network trees are developed.
Analysis of the trees in Step 3 develops the sneak circuit and design concern
reports and permits the investigation and correction of these
A simplified schematic diagram of a portion of the
radar control circuit is shown in Figure A-1. The circuit controls three
phase, 400 Hz primary power to the aircraft radar system. The control power
may be provided by an external source when the aircraft is on the ground or by
aircraft generators when the engines are operating.