Super II Modification to the Citation 550
The Super II is a modification to the Cessna Citation 550 model with new Williams International FJ44-3 Wide Sweep 3,000 Pound Turbofan engines. Included in this modification are:
• Digital Channel FADEC for comprehensive power
management.
• Full time syncing between the two engines when in ECU mode.
Airframe modification to accept the new engines:
• All engineered and approved structural changes
to the aircraft to accept the FJ44’s.
• All new engine mounts, hoses and bleed air lines.
• New high recovery inlets and convergent / divergent exhaust
nozzles.
• New Sierra Meggitt LCD Digital Engine Instrument Display.
• Paint on the affected areas.
The Super II provides superior performance and capability. The following are estimated Super II performance benefits over the JT15D-4 engine:
• The JT15D-4 powered aircraft can only maintain
Vmo to 19,000 feet where the Super II can maintain Vmo all the way
to the Mmo limit and then Mmo as high as 35,000 feet.
• Climb direct to 43,000 feet at gross weight in less than 30
minutes.
• Economy cruise speed as much as 30 knots faster.
• Fly 150 miles farther at maximum cruise power.
• Fly 200 miles farther at economy cruise power.
• Climb 50% better at sea level with all engine operative and 38%
better at sea level with one engine operative.

