Mitsubishi MU-300 Diamond
The Mitsubishi MU-300 Diamond was Japan’s first successful business jet and the last aircraft designed by Mitsubishi before the programme passed to Beech. Beechcraft developed it into the Beechjet 400, a type that became far more numerous than the original Japanese-built Diamond. The compact jet combined a swept wing, T-tail, and high cruise speed with a cabin sized for typical light-jet missions. Spotting an original MU-300 rather than a later Beechjet is therefore unusually rare.

Did you know?
Spotting an original MU-300 is rare — most surviving examples were later built in the US as the near-identical Beechjet 400.
Specifications
| Length | 14 m (46 ft) |
|---|---|
| Wingspan | 13.3 m (44 ft) |
| Height | 4.2 m (14 ft) |
| Maximum passengers | 9 |
| Persons on board | 10 |
| Crew | 2 |
| Maximum take-off weight | 7.3 t |
| Range | 1,700 NM (3,148 km) |
| Maximum speed | 449 kt (832 km/h) |
| Stall speed | 91 kt (169 km/h) |
| Service ceiling | 45,000 ft (13,716 m) |
| Optimum ceiling | 27,000 ft (8,230 m) |
| Rate of climb | 3,000 ft/min (15.2 m/s) |
| Take-off distance | 1,201 m (3,940 ft) |
| Landing distance | 1,100 m (3,609 ft) |
| Fuel capacity | 2,770 l |
| Engines | 2x Pratt & Whitney Canada JT15D-4 |
| Units built | 92 |
Curated by CatchFlights from manufacturer documents, ICAO Doc 8643 and reference works; values are left out where no source could confirm them. Sources are listed on our credits page.
In CatchFlights
In CatchFlights the Mitsubishi MU-300 Diamond starts as a Very rare catch. The tier is an editorial judgement of how special a sighting of this type is. The more often you catch it, the closer it moves to Common for you.
A catch counts for the manufacturer Mitsubishi, the MU-300 Diamond family and the model in your collection, and the daily Type Rating quiz asks about the types of each family.
Catch it yourself.CatchFlights shows the aircraft flying near you on a radar, so a type like this one is only a catch away when it passes overhead. Explore CatchFlights.
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