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.

Invader Models

Civil

OnMark Executive
OnMark Marketeer
OnMark Marksman

Military

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.
64-17641	44-35322	13 Aug 1964	Shot down 29 Dec 1967.
64-17642	44-35345	9 Jul 1964	Shot down 27 Aug 1967.
64-17643	44-34392	3 Aug 1964	Crashed 25 Jul 1966.
64-17644	44-35451	13 Aug 1964	Scuttled in Vietnam in 1975.
64-17645	44-35546	13 Aug 1964	Scuttled in Vietnam in 1975.
64-17646	44-35375	12 Aug 1965	Shot down 8 Jul 1969.
64-17647	44-35904	23 Aug 1964	Scrapped.
64-17648	43-22732	8 Sep 1964	Shot down 30 Apr 1968.
64-17649	43-22720	9 Sep 1964	Scrapped.
64-17650	44-35766	9 Sep 1964	Shot down 28 Jun 1966.
64-17651	44-34119	19 Sep 1964	On display at Korean Aerospace Industry Aerospace Museum, Sancheon AFB, Seoul, Korea.
64-17652	44-34361	4 Oct 1964	Scuttled in Vietnam in 1975.
64-17653	41-39378	12 Oct 1964	On Display at Pima Air & Space Museum.
64-17654	41-39491	20 Oct 1964	Scuttled in Vietnam in 1975.
64-17655	44-34184	1 Nov 1964	Scrapped.
64-17656	44-35847	10 Nov 1964	Destroyed in crash.
64-17657	43-22649	11 Nov 1964	Nose section is on display at Wings Museum, Balcombe, East Essex, UK.
64-17658	44-35685	17 Nov 1964	Scrapped.
64-17659	41-39564	27 Nov 1964	Destroyed in crash.
64-17660	44-35608	30 Nov 1964	Scrapped.
64-17661	44-35433	2 Dec 1964	Scrapped.
64-17662
64-17663
64-17664
64-17665
64-17666
64-17667
64-17668
64-17669
64-17670
64-17671
64-17672
64-17673
64-17673
64-17674
64-17675
64-17676
64-17677
64-17678
64-17679

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.

Jul

9 - 64-17642 accepted by USAF.

Aug

3 - 64-17643 accepted by USAF.
12 - 64-17646 accepted by USAF.
13 - 64-17641, 64-17644, & 64-17645 accepted by USAF.
23 - 64-17647 accepted by USAF.

Sep

8 - 64-17648 accepted by USAF.
9 - 64-17649 & 64-17650 accepted by USAF.
19 - 64-17651 accepted by USAF.

Oct

4 - 64-17652 accepted by USAF.
12 - 64-17653 accepted by USAF.
20 - 64-17654 accepted by USAF.

Nov

1 - [[64-17655] accepted by USAF.
10 - 64-17656 accepted by USAF.
11 - 64-17657 accepted by USAF.
17 - 64-17658 accepted by USAF.
27 - 64-17659 accepted by USAF.
30 - 64-17660 accepted by USAF.

Dec

2 - 64-17661 accepted by USAF.
21 - 64-17640 returns to OnMark.
31 - 64-17641 returns to OnMark.

1965

Jan

22 - 64-17641 leaves OnMark for 1st Air Commando Wing.

Feb

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

1967

Jul

12 - 64-17641 returns to OnMark for the third time.
19 - 64-17648 returns to OnMark.
27 - 64-17651 returns to OnMark.

Aug

2 - 64-17661 returns to OnMark.
9 - 64-17654 returns to OnMark.
29 - 64-17640 returns to OnMark for the third time.

Sep

11 - 64-17660 returns to OnMark.
13 - 64-17648 leaves OnMark.
22 - 64-17651 leaves OnMark.
28 - 64-17661 leaves OnMark.

Oct

2 - 64-17658 returns to OnMark.
9 - 64-17654 leaves OnMark.
19 - 64-17640 leaves OnMark for Sacramento Air Material Area (SMAAR).
31 - 64-17660 leaves OnMark.

Nov

10 - 64-17658 leaves OnMark.