- Aircraft History, Specification and Information -
Mitsubishi MU-300 Diamond
Mitsubishi MU-300 Diamond 1 - YV2347 - Business Jet Aircraft
1984 Mitsubishi MU-300 Diamond 1
YV2347 (sn A064 S.A.)
Photo taken November 02, 2010
Okeechobee County Airport, FL - USA (OBE / KOBE)
Photo © Marcel Siegenthaler

The Mitsubishi MU-300 Diamond is a small twin-engine jet corporate aircraft. Designed and built by Mitsubishi, it has been further developed and updated by the Beech Aircraft Company, now part of Hawker Beechcraft.

Design and development

Designed as the Mitsubishi MU-300 Diamond, an all-new, all-jet development to complement and slot above the Mitsubishi MU-2 and provide Mitsubishi Heavy Industries with their top-of-the-line corporate aircraft model (hence the name "Diamond"). The aircraft first flew on 29 August 1978. It is a small, low-winged twin-turbofan aircraft of all metal construction, flown by a crew of two pilots and accommodating eight passengers in a pressurised cabin. Its wings use a computer designed, Supercritical airfoil in order to minimise drag. Its two Pratt & Whitney Canada JT15D turbofans are mounted on the rear fuselage.

Beechcraft bought the production rights and began manufacturing it as their own model, initially redesignated as the Beechjet 400. The Beechjet 400 was certified by the FAA in May 1986.

Raytheon/Beechcraft steadily developed their own improvements to the model, leading to the 400A in 1990. Improvements in the 400A include longer range, higher take-off weights and improved luxury appointments. An all-glass flight deck was also offered. Beechcraft also developed a version for the United States Air Force known as the T-1A Jayhawk, used as a trainer for large aircraft crews (such as tankers and strategic transports). A total of 180 T-1A trainers were delivered between 1992 and 1997. Another military variant is the Japan Air Self-Defense Force 400T trainer which shares the same Type Certificate as the T-1A.

In 1993 Raytheon purchased the Hawker business jet product line from British Aerospace. The Beechjet 400 was eventually renamed the Hawker 400 to map it into the Hawker product line. The Hawker 400XP incorporates further aerodynamic, mechanical and interior improvements gleaned from the Hawker 800XP.

In October 2008, Hawker Beechcraft announced upgrades to the design, resulting in the new model designation Hawker 450XP. Upgrades were to include new, more fuel efficient engines (Pratt & Whitney PW535Ds with 2,965 pounds of thrust each). The Hawker 450XP was canceled in June 2009 due to poor economic conditions.


  • Mitsubishi MU-300 Diamond I
    Initial model. Two prototypes and 89 production aircraft built.
  • Mitsubishi MU-300-10 Diamond II
    Improved version of Diamond I; 11 built, all subsequently redesignated as Beechjet 400s.
  • Beechcraft Model 400 Beechjet
    Version of Diamond II built after Beechcraft bought the production rights to the MU-300 from Mitsubishi, 54 built in addition to 11 Diamond IIs.
  • Model 400A
    Upgraded model, initially produced as the Beechcraft Beechjet 400A, then Raytheon Beechjet 400A, then Raytheon Hawker 400XP, then Hawker Beechcraft Hawker 400XP. One prototype converted from Model 400 and 593 built as of the end of 2009.
  • Model 400T
    Military version of the Model 400A, 180 built for the United States Air Force as the T-1 Jayhawk and 13 built for the Japan Air Self-Defense Force.


The type is used by many corporate and private users, it is also used by air-taxi and air charter companies. NetJets Europe operates a fleet of 27 Hawker 400XPs.

Specifications (Beechjet 400A)

General characteristics
Crew: 2 pilots
Capacity: 7—9 passengers
Length: 48 ft 5 in (14.76 m)
Wingspan: 43 ft 6 in (13.26 m)
Height: 13 ft 11 in (4.24 m)
Wing area: 241.4 sq ft (22.43 m²)
Empty weight: 10,050 lb (4,558 kg)
Useful load: 5,850 lb (2,653 kg)
Max takeoff weight: 16,100 lb (7,303 kg)
Powerplant: 2× Pratt & Whitney Canada JT15D-5 turbofan, 2,900 lbf (12.9 kN) each

Maximum speed: 468 knots (866 km/h, 539 mph) (Mach 0.78 MMO)
Cruise speed: 443 knots (820 km/h, 510 mph) at 23,000 ft (7,000 m)
Stall speed: 92 knots (171 km/h, 106 mph) (full flaps)
Range: 1,693 nmi (3,135 km, 1,949 mi) at 45,000 ft (13,700 m)
Service ceiling: 45,000 ft (13,700 m)
Rate of climb: 3,770 ft/min (19.2 m/s)

Last updated November 21, 2010
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hawker 400".
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