Aircraft Electrical Systems Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent). a. 2, 5, 6, 7. b. 1, 2, 4, 5. c. 2, 4, 6, 7.