Mitsubishi Heavy Industries
Mitsubishi MU-300 / Beechjet 400 / Hawker 400 lineage
The MU-300 established the airframe lineage that continued through the Beechjet 400 and Hawker 400 family. Mitsubishi’s design combined a swept wing with a comfortable light-jet cabin, creating a platform that successive owners improved with engines, systems and interior changes.
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Aircraft profile
Development and lineage
- Manufacturer
- Mitsubishi Heavy Industries
- Family
- MU-300 / Beechjet 400 / Hawker 400
- Aircraft category
- Business Jet
- Propulsion
- Jet
Aliases and related designations
Aircraft data
Key specifications
- Original programme
- Mitsubishi MU-300 Diamond
- First flight of MU-300
- 1978
- Early engine variants
- JT15D-4 / -4D
- Diamond II / Beechjet 400 engine
- JT15D-5
- Main development sequence
- Diamond I / Diamond IA / Diamond II / Beechjet 400 / 400A / Hawker 400 family
- Common architecture
- Low swept wing, rear engines, T-tail and pressurized executive cabin
This is a design-lineage record. Weights and performance belong to individual variants, not the entire family.
Overview
Program history
Mitsubishi developed the MU-300 after the success of the MU-2, seeking higher cruise speed for corporate travel. The first flight came in 1978. Beechcraft later acquired the programme and developed the 400 and 400A; subsequent Hawker branding continued that evolution. This lineage page explains the relationship, while individual model pages identify the applicable specification.