The Beechjet 400A: Entry-Level Jet, Professional Performance

History: From Diamond to Beechjet to Hawker

The Beechjet 400A traces its lineage to the Mitsubishi Diamond II, a Japanese-designed light jet first flown in 1978. Beechcraft purchased the manufacturing rights and Diamond II type certificate from Mitsubishi in 1985, redesigned the cockpit with Collins Pro Line 4 avionics, upgraded the cabin, and rebranded the aircraft as the Beechjet 400 (1986) and then the improved 400A (1990). Raytheon acquired Beechcraft in 1980, and the 400A production continued under Raytheon until 2003, when it was succeeded by the Hawker 400XP. Over 800 Beechjet 400A airframes were delivered during the model's 13-year production run.

The 400A differs from its predecessor (the 400) in several ways: a 120-pound increase in maximum takeoff weight, improved engine ratings on the Pratt and Whitney JT15D-5 turbofans, redesigned cabin sidewalls, and an upgraded trailing-link main landing gear. The later Hawker 400XP (2003-2009) added Williams FJ44-4A-32 engines with FADEC, further increasing performance and reducing maintenance costs. Understanding which variant you are evaluating matters significantly for operating economics.

Performance Specifications

The 400A's FL450 ceiling is higher than many midsize jets. At FL430, the aircraft sits above most weather and airline traffic. The JT15D-5 engines are not fuel-efficient by modern standards (150-165 gallons per hour versus 100-120 for current-generation light jets), but fuel is the trade-off for a jet that costs under $1.5 million to acquire.

The Beechjet 400A flies faster than a Citation CJ3 (450 kts vs 416 kts) and higher than a Phenom 300 (FL450 vs FL450, tied). It costs one-fifth the price. The engines burn more fuel and the maintenance is more labor-intensive, but the performance envelope remains competitive 30 years after the model entered service.

Cabin Configuration and Comfort

The 400A cabin seats 7 passengers in a standard configuration: a four-place club arrangement (two forward-facing, two aft-facing seats) plus a three-place side-facing divan along the aft bulkhead. The cabin measures 15.5 feet long, 4.9 feet wide, and 4.8 feet tall. Standing height is limited; passengers over 5 feet 10 inches must crouch. The side-facing divan is uncomfortable for passengers over 5 feet 8 inches on flights exceeding 2 hours.

• Club seats: Four-place arrangement with 30-inch seat pitch. Adequate for 3-hour flights. The seats track fore and aft for legroom adjustment. Newer refurbished interiors offer significantly improved cushioning over the original Beechcraft seats.
• Baggage: 53 cubic feet of externally accessible baggage space in the aft compartment. Accessible in flight through a cabin bulkhead pass-through on some configurations. Four passengers with standard business luggage fit comfortably.
• Lavatory: Enclosed aft lavatory behind the divan. Small but functional with a curtain divider. Privacy is marginal in the 4.9-foot-wide cabin.
• Cabin noise: The JT15D-5 engines produce more cabin noise than modern turbofans. Expect 72 to 75 dB at cruise, comparable to a Hawker 800XP. Active noise-canceling headsets recommended for long flights.
• Cabin management: No cabin management system in original configuration. Aftermarket upgrades (GoGo AVANCE, Honeywell connectivity) are available but add $150,000 to $300,000 to acquisition cost.

Ownership Economics: What a 400A Actually Costs to Own

The Beechjet 400A is a sub-$2,000-per-hour jet. For context, a new Phenom 300E costs $11.2 million and operates at $2,400 per hour. A pre-owned CJ3 costs $4 to $5 million and operates at $1,900 per hour. The 400A delivers 80 percent of the CJ3's performance at 30 percent of the acquisition cost. The trade-off is higher maintenance complexity (JT15D overhauls cost $350,000 to $400,000 per engine at 3,600-hour TBO intervals) and aging avionics in unremodified aircraft.

Critical Maintenance Items

• JT15D-5 engine overhaul: $350,000-$400,000 per engine at 3,600-hour TBO. Hot section inspection at 1,800 hours: $80,000-$100,000 per engine.
• Landing gear overhaul: $45,000-$55,000 at 12,000 landings or 12 calendar years.
• Avionics obsolescence: Collins Pro Line 4 is a legacy system. Replacement with Garmin G5000 or Pro Line Fusion costs $500,000-$700,000. Some buyers prefer aircraft that already have this upgrade completed.
• Corrosion: Airframes over 25 years old require thorough corrosion inspections. Repair costs vary from $5,000 (minor) to $100,000+ (significant structural corrosion).
• AD compliance: The fleet has accumulated numerous Airworthiness Directives over 30+ years. Pre-buy inspection should verify full AD compliance history.

Who Should Buy a Beechjet 400A in 2026

The 400A fits a specific buyer profile:

• Owner-pilots transitioning from turboprops who want jet speed without a $5 million acquisition. The 400A is the least expensive jet that cruises above 400 knots and reaches FL450.
• Small businesses that fly 150 to 250 hours per year on routes under 1,200 NM. At those utilization rates, the 400A's operating cost advantage over newer jets outweighs its comfort and efficiency penalties.
• Training operations: Several Part 142 training centers use the 400A/400XP for initial jet type ratings because the aircraft is inexpensive to insure and operate for training purposes.
• Charter startups: Part 135 operators adding a first or second aircraft to their certificate. The low acquisition cost enables entry into charter without significant capital.

The Beechjet 400A is not the best light jet. It is the most accessible light jet. For buyers with a $1 to $1.5 million budget, there is nothing else in the market that flies 450 knots to FL450 with 7 seats and 1,500 NM of range. The math works until it does not: engine overhauls, avionics upgrades, and corrosion can erase the acquisition savings if the aircraft was not maintained properly.