The U.S. aircraft register, updated daily
Parts

Underseat Scope

No failure report names the underseat scope. 6 FAA approvals let 1 company make a replacement underseat scope, Norton Performance Plastics CORP, Composites Operations holding the most (6).

Approved replacement parts 6 parts manufacturer approvals

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

For these models most: Beechcraft E18 (4), Lockheed 18 (1).

MakerPartReplacesFitsGrantedStatus
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. RCA 5" AVQ-50 Radar Scope 268-1BModification PartBeech Raytheon) (E18S, E18S-97001992-08-25current
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. 5" RCA AVQ-55/20 Radar Scope 299-05Modification PartBeech Raytheon) (G18S1992-08-25current
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. 5" RCA AVQ-55/20 Radar Scope 299-03Modification PartBeech Raytheon) (E18S, E18S-97001992-08-25current
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. Collins 4" WP-103 Radar Scope 561G-3... 299-02Modification PartBeech Raytheon) (E18S, E18S-97001992-08-25current
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. (Pilots Seat) 268Modification PartLockheed 181992-08-25current
Norton Performance Plastics CORP, Composites OperationsUnderseat Scope Mt. Collins 4" WP-103 Radar Scope 299-01Modification PartBeech Raytheon) (E18S, E18S-97001992-08-25current

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.