The U.S. aircraft register, updated daily
Parts

Auto Step

No failure report names the auto step. 2 FAA approvals let 1 company make a replacement auto step, Flight Enhancements, LLC holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a auto step and sell it as an approved part for the models named. These are the companies holding such approvals for a auto step:

For these models most: Mooney M-20 (2).

MakerPartReplacesFitsGrantedStatus
Flight Enhancements, LLCAuto-Step Actuator AS-KIT-001Modification ArticleMooney International... M20C, M20D, M20E2018-09-09current
Flight Enhancements, LLCAuto-Step Actuator AS-KIT-002Modification ArticleMooney International... M20A, M20B, M20C2018-09-09current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.