The term auto-bomb describes a certain class of specialized motion-and/or-time-sensitive explosive devices.
One such device was used by the Hood in Trapped in the Sky, in order to sabotage the Fireflash airliner during its maiden flight - resulting in the first-ever mission of International Rescue...
Trapped in the Sky[]
The Hood's auto-bomb consisted of two parts - the auto-bomb explosive unit itself, and an Mk.6 detonator - and was so placed alongside the landing-gear controls, as to render Fireflash unable to land...
The explosive unit (left) and the detonator unit (right)
The Stately Homes Robberies[]
In the 'anniversary edition' of The Stately Homes Robberies, a very different sort of master criminal - yet up to no good, nonetheless - jewel thief Mr. Charles, leaves behind a time-sensitive Auto-Bomb device in the Jewel House of the historic Tower of London...after he and his criminal cohort, Dawkins, take off with the Crown Jewels!
When Lady Penelope and Parker are overcome by gas before they can stop the thieves, it's up to aquanaut Gordon Tracy to get there in time and defuse the Auto-Bomb, before it can detonate...