Title: Hughes (MDHI) 369 OH-6 Cayuse

The MDHI 500 series began life as the Hughes model 369, designed for the US Army LOH (light observation helicopter) contest, and first flew in 1963. It won the LOH contest but subsequently had to share the Army order with the Bell OH-58. The aircraft has a small diameter rotor and a short tail-boom to give a rapid control response.

The aircraft was very successful in both the military and civil sphere’s and has been in almost continuous production since 1967, although under different owners. It has also been built under licence in Italy, Japan, Argentina and Korea. Almost 5,000 examples have been produced.

This title contains two flight manuals for US Army versions of the Hughes 369 series of helicopters along with two publicity brochures. The flight manuals have been scanned from the original flight manuals and retain any colour pages unless otherwise stated.



This title contains:

  • US Army Operator’s Manual for the OH-6A helicopter, TM 55-1520-214-10 dated 17 December 1976 with approx. 201 pages.
  • US Army Operator’s Manual for the Mission Modified Special Operations Aircraft AH-6J, MH-6J, AH/MH-6J, TM AWR-SUP-AH/MH-6J dated 15 December 1998 with approx. 500 pages. (Scanned from a photocopy, but given the informal nature of the manual, that may be all there ever was.)
  • Hughes manufacturer’s colour brochure for the Hughes 500 (Model 369) undated with approx. 22 pages.
  • Hughes manufacturer’s colour brochure for the Hughes 500M-D Defender, undated with approx. 8 pages.