The U.S. aircraft register, updated daily
Parts

Oil Door

No failure report names the oil door. 10 FAA approvals let 4 companies make a replacement oil door, Skybolt Composite Designs holding the most (4).

Approved replacement parts 10 parts manufacturer approvals

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

For these models most: Cessna 180 Skywagon (2), Cessna 175 Skylark (2), Cessna P172 (1), Cessna 182 Skylane (1), Cessna 172 Skyhawk (1).

MakerPartReplacesFitsGrantedStatus
Stoots Aviation LLCOil Door Doubler ST-401Modification ArticleTextron Aviation Inc. 170A, 170B, 1722024-05-16current
Knots 2U LTDOil Door SC180752-10752626-1Cessna Aircraft Company 180H, J, K2014-09-03current
Knots 2U LTDOil Door SC180751-1752000-56Cessna Aircraft Company 180, A, B2014-09-03current
Stoots Aviation LLCOil Door Backing Plate ST-401Modification PartsCessna 175, 175A, 175B2012-01-26current
Stoots Aviation LLCOil Door Backing Plate ST-401Modification PartsCessna 175, 175A, 175B2012-01-25current
Jormac Aerospace INCOil Door Lock, Engine Nacelle JLOC-030-060NewBoeing B737-700/-8002003-01-14current
Skybolt Composite DesignsOil Door SC180751-1Modification PartCessna C180 All Series2001-03-13current
Skybolt Composite DesignsOil Door SC185751-1Modification PartCessna C185 All Series2001-03-13current
Skybolt Composite DesignsOil Door SC185752-1Modification PartCessna C185 All Series2001-03-13current
Skybolt Composite DesignsOil Door SC180752-1Modification PartCessna C180 All Series2001-03-13current

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.