look at FAA Advisory Circular # 65-32A, appendix 3. You will find this statement about meeting the experience requirement in Part 65, § 65.77. This statement was also included in the original 2006 version of A/C 65-32.
A repairman (LSA) with a maintenance rating may document time worked on LSA. To apply for a mechanic certificate with airframe or powerplant rating, the repairman must document at least 18 months each of practical experience, working on either airframes or powerplants, or at least 30 months of practical experience working on airframes or powerplants concurrently. One month’s practical experience is 160 hours of documented time. This time includes all time working on SLSAs and only condition inspection time on ELSA aircraft. Documentation should be in a written format, such as a log showing the date and number of hours spent performing the work, type of work performed, and the registration number of the aircraft the work was performed on. The log entries must be verifiable, which can be accomplished by either statements and/or initials from the individual’s employer or supervisor or owner of the aircraft following each entry in the repairman’s logbook