Hourly Maintenance Program (HMP)-covered parts, components and avionics are considered to always be guaranteed to be either actually in, or to be qualified for restoration to, a "zero" or "low" time service life condition. They retain a high dollar value, regardless of their actual service life status, by virtue of remaining in "like new" condition as a result of the paid-up HMP. For instance, if the subject helicopter is under a "full" HMP, the weighted average of the component life is considered to be 0% Used. If the subject helicopter is under an engine-only HMP, the weighted average of the components may be considered approximately 20% better than the total weighted average of all the components. If the subject helicopter is under an engine+gearbox HMP, the weighted average of the components is normally about 30% better than the total weighted average of all the components. All HMP assumptions are based on full transferability to the new owner in the event of a transfer of title.