SOUTHWEST INSPECTS TUGS FOR SWITCH FAULT
Southwest Airlines is performing a fleet-wide check of its baggage tugs after a runaway vehicle damaged the engines and fuselage of a Boeing 737-300 (N624SW) leaving the gate at Los Angeles International airport on 9 April. Investigators found a faulty safety switch on the errant tug and others at the US hub.
We have this problem in Atlanta but it only occurs when the tug is occupied.