The U.S. aircraft register, updated daily
Parts

Deluxe Or

No failure report names the deluxe or. 3 FAA approvals let 2 companies make a replacement deluxe or, Aviation Fabricators holding the most (2).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Cessna 550 Citation II (2), Cessna 500 Citation I (2), Cessna 501 Citation I/SP (1).

MakerPartReplacesFitsGrantedStatus
Aviation FabricatorsDeluxe or Standard 3 place Aft Couch 90503-1 and 90503-101, per...Modification PartCessna 5502008-12-08current
Aviation FabricatorsDeluxe or Standard 3 Place Aft Couch 90500-1, -101, -102, -103...Modification PartCessna 500 & 5502008-12-08current
Branson Aircraft CORPDeluxe or Standard Three-Place Aft Couch Dwg 90501Modification PartCessna 500, 550, 5011991-10-07current

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.