The aircraft service cable shall contain how many conductors?

• A. Four
• B. Eight
• C. Six
• D. Ten

Answer: (C)

When servicing an aircraft, the exterior power cable must carry multiple electrical paths to support the aircraft’s power needs safely. For a typical three‑phase power system on aircraft, you need three hot conductors to carry the phases, a neutral to return current, and a protective grounding conductor for safety. That accounts for five conductors. The standard service cable used in practice is built with six conductors to include an extra lead that can serve an additional requirement (such as a control/sense or secondary safety path) depending on the aircraft and ground equipment. So, six conductors is the configuration that covers the common three‑phase power needs plus neutral, ground, and one extra lead, making it the correct choice.