The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

H. O. Aircraft INC

Named as the FAA publishes it on its approvals.

Holds 5 approved modifications, most of them for the Piper PA-19. FAA spelling: H. O. Aircraft Inc.

Approved modifications 5 · newest first

2015-08-26SA03451CH · Installation of the reversible, 3-bladed MT-Propeller model MTV-9-D-C-R(M)/CR210-58 hydraulic constant speed... · 180, 180A, 180B
2014-01-15SA02828CH · Installation of the Lycoming IO-390-A1A6 engine, MT model MTV-15-B/210-58 constant speed propeller and associated accessories · PA-18, PA-18-105 (Special), PA-18-125 (Army L-21A)
2012-05-23SA03115CH · Replacement of the original heel operated braking system with a toe brake operating system · PA-12, PA-12S, PA-18-105 (Special)
2011-07-01SA02979CH · Installation of the Lycoming O-320-A2B engine in accordance with H. O. Aircraft, Inc. Installation Manual, Document... · 7ECA
2010-11-08SA02906CH · Installation of the reversible MT-Propeller model MTV-15-B-C-R(M)/CR210-58 two bladed hydraulic constant speed propeller · PA-18, PA-18-105 (Special), PA-18-125 (Army L-21A)

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, parts manufacturer approvals, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.