Under which condition may you drive a vehicle around jet engines?

• A. If the aircraft is unchocked
• B. If the anti-collision lights are off
• C. If the aircraft is chocked
• D. If escorted by security

Answer: (C)

Wheel chocks prevent the aircraft from moving, so you can drive a vehicle around jet engines only when the aircraft is chocked. Blocking the wheels stops any roll that could happen if the plane shifts slightly, wind gusts, or engine operations occur nearby, keeping you and others safe in the area of the engine intakes. Being unchocked leaves the aircraft free to roll, which is dangerous around active engines. Turning off anti-collision lights or needing security escort doesn’t address the actual risk of movement, so those conditions don’t make it safe to operate. The safe and correct condition is that the aircraft must be chocked.