OnMark Engineering Company

OnMark Eng. Co.
Type: Private Company
Active:
Founder:
Headquarters: Van Nuys, CA
Business: Modifications
Employees:

OnMark Engineering was a noted aerospace company that specialized in modifying Douglas Invader airframes. In fact, aside from the Invader modifications, their only other project was the modification of a Boeing 377 Stratocruiser into the prototype Pregnant Guppy for Aero Spacelines.

The building itself was located on the north side of the airport, off to the right of the approach end of runway 16R. The building now appears to be owned by Moulton Logistics.

Models

OnMark Executive
OnMark Marketeer
OnMark Marksman
YB-26K - 1 unit
B-26K - 40 units
(Note: The YB-26K was converted into a production B-26K model, so only 40 airframes were used for the B-26K project in total.)

Planes

B-26Ks

Serial Number	Old Serial	Date Converted	Comments
64-17640	44-35896	20 May 1964	On Static Display at the South Dakota Air & Space Museum.

Timeline

The following timeline has been constructed from cross referencing USAF Aerospace Vehicle Inventory Reports, Civil FAA Records, and accounts from OnMark employees.

1964

May

20 - 64-17640 conversion is complete
25 - 64-17640 test flight.

Jun

15 - 64-17640 accepted by USAF.

Dec

21 - 64-17640 returns to OnMark.

1965

Feb

27 - 64-17640 leaves OnMark for 1st Air Commando Wing.

1967

Aug

29 - 64-17640 returns to OnMark for the third time.

Oct

19 - 64-17640 leaves OnMark for Sacramento Air Material Area (SMAAR).