What is the maximum operating altitude?

• A. 40,000 ft
• B. 50,000 ft
• C. 42,000 ft
• D. 45,000 ft

Answer: (D)

The maximum operating altitude is the highest altitude at which the Beechjet 400A can sustain normal cruise performance with safe margins for climb and pressurization. For this aircraft, certification data list 45,000 feet as the service ceiling. This means at or below 45,000 feet the engines, airframe, and electrical/air systems can maintain the required climb capability (and keep cabin pressure within limits) to operate safely. Above that altitude, the thinning air reduces engine performance and aerodynamic effectiveness enough that the aircraft can no longer meet its certification performance, so operation beyond 45,000 feet is not permissible.