The Cessna 500 Citation I is a light twin-engine jet built for short regional flights

The Cessna 500 Citation I is a six-to-eight-seat business jet that first flew in 1969 and entered service in 1971. It was designed as an affordable entry point into jet ownership for smaller companies and charter operators, sitting between piston-engine aircraft and larger corporate jets in both size and operating cost. The Citation I remains one of the most produced business jets ever built, with over 1,100 aircraft delivered before production ended in 1989.

The aircraft is powered by two Pratt & Whitney JT15D turbofan engines, each producing 2,200 pounds of thrust. This twin-engine design gives the Citation I better performance and safety margins than single-engine aircraft, while keeping fuel consumption and maintenance costs lower than larger jets. The pressurized cabin allows the aircraft to cruise at altitudes up to 43,000 feet, though typical operating altitudes are between 25,000 and 35,000 feet.

The Citation I has a maximum range of roughly 1,700 nautical miles with reserves, meaning it can fly from New York to Miami or Los Angeles to Denver without refueling. Cruise speed is approximately 380 knots (about 440 miles per hour), making it faster than turboprops but slower than larger business jets. The aircraft requires a crew of two — pilot and co-pilot — and can carry four to six passengers depending on configuration and fuel load.

Key Takeaways

  • The Citation I is a light twin-engine jet that seats six to eight people and was built from 1971 to 1989, making it one of the most common business jets in the used market.
  • Operating costs run between $2,500 and $3,500 per flight hour, including fuel, crew, maintenance, and insurance, which is significantly less than larger jets but more than turboprops.
  • The aircraft requires two pilots and a valid type rating, meaning not every pilot can legally fly one without additional training and certification.
  • Used Citation I aircraft typically sell between $500,000 and $2 million depending on age, total flight hours, maintenance history, and avionics upgrades.

Engine performance and fuel consumption

The two Pratt & Whitney JT15D engines are the heart of the Citation I's performance. Each engine produces 2,200 pounds of thrust at takeoff, giving the aircraft a combined 4,400 pounds of thrust. This is modest by modern jet standards but sufficient for the aircraft's weight and mission. The engines are known for reliability and have a good safety record, though they do require regular overhauls — typically every 3,500 to 5,000 flight hours depending on maintenance program and operating conditions.

Fuel consumption varies with altitude, weight, and cruise speed, but a typical flight burns between 200 and 250 gallons per hour. The aircraft carries 1,111 gallons of usable fuel in its wing tanks, which at cruise burn rates gives roughly five to five and a half hours of endurance. Pilots must account for reserves — federal regulations require at least 45 minutes of fuel remaining at the destination, plus fuel to reach an alternate airport — so actual range is lower than the theoretical maximum.

Engine maintenance is a major operating expense. Overhauls cost between $400,000 and $600,000 per engine, and owners typically budget for one overhaul every five to seven years depending on flight hours. Some owners participate in progressive maintenance programs, which spread the cost over time by performing smaller inspections and repairs at regular intervals rather than waiting for a major overhaul.

Cockpit systems and pilot requirements

The Citation I cockpit is relatively straightforward by modern standards, which is both an advantage and a limitation. Early models came with basic steam gauges — mechanical instruments that show altitude, airspeed, heading, and vertical speed. Many aircraft have been retrofitted with glass cockpits, typically Garmin G1000 or Avidyne systems, which replace mechanical gauges with digital displays and add modern navigation and autopilot capabilities.

The aircraft requires a crew of two, and both pilots must hold a commercial pilot license with a multi-engine rating. More importantly, both pilots must have a type rating specific to the Citation I, which means they have completed training and passed a checkride in that exact aircraft type. This requirement exists because the Citation I has unique handling characteristics, systems, and emergency procedures that differ from other aircraft. A pilot cannot legally fly a Citation I without this rating, even if they have thousands of hours in other jets.

Type rating training typically takes 40 to 60 hours of ground school and simulator time, plus 10 to 15 hours of actual flight training. Training costs range from $15,000 to $25,000 per pilot depending on the training provider and whether the pilot already has jet experience. This is a significant cost for operators and one reason why some smaller companies choose to charter rather than own.

Maintenance, inspections, and airworthiness

The Citation I is subject to the same Federal Aviation Administration (FAA) inspection and maintenance requirements as all other aircraft. The aircraft must pass an annual inspection performed by an FAA-certified mechanic, and certain components require inspection at specific intervals — typically every 100 hours, 500 hours, or 2,000 hours of flight time depending on the part.

Beyond routine maintenance, the Citation I has several components with mandatory overhaul intervals. The engines require overhaul every 3,500 to 5,000 hours. The landing gear must be overhauled every 2,000 hours. The airframe itself has a fatigue inspection program that becomes more stringent as the aircraft ages, particularly for aircraft with more than 10,000 total flight hours. These inspections look for cracks and metal fatigue in the fuselage and wings, and they can be expensive and time-consuming.

Older Citation I aircraft — particularly those built in the 1970s and early 1980s — may have aging avionics, outdated interior materials, and components that are becoming harder to source. Parts availability is generally good because so many aircraft were built, but some original equipment is no longer manufactured. Owners of older aircraft often budget for upgrades to avionics, interior refurbishment, and replacement of obsolete systems.

Used market pricing and ownership costs

The used Citation I market is active because the aircraft is common and relatively affordable compared to larger jets. Prices vary widely based on age, total flight hours, maintenance history, and avionics. A Citation I from the late 1970s with 8,000 to 10,000 total hours and basic avionics might sell for $500,000 to $800,000. A well-maintained aircraft from the 1980s with modern glass cockpit avionics and lower flight hours could command $1.2 million to $1.8 million. A few exceptionally well-maintained examples with very low hours and premium interiors have sold for over $2 million, but these are outliers.

Total operating cost — including fuel, crew, maintenance, insurance, hangar, and other expenses — typically runs between $2,500 and $3,500 per flight hour. This breaks down roughly as follows: fuel and oil account for $1,000 to $1,200 per hour; crew costs (salary, training, benefits) add $400 to $600 per hour; maintenance and inspections add $600 to $800 per hour; and insurance, hangar, and miscellaneous expenses add another $300 to $400 per hour. These figures vary significantly based on how the aircraft is used, where it is based, and whether the owner operates it themselves or hires a professional crew.

For comparison, charter flights in a Citation I typically cost between $3,500 and $5,000 per flight hour, which means that ownership only makes financial sense if the aircraft will be flown regularly — typically 400 to 600 hours per year or more. Owners who fly fewer hours often find that charter is cheaper than ownership.

Comparison to other light jets and turboprops

The Citation I sits in a crowded market segment. Other light jets from the same era include the Learjet 35, the Hawker 125, and the Sabreliner. The Learjet 35 is faster and has a longer range but burns more fuel and costs more to maintain. The Hawker 125 is larger and more luxurious but significantly more expensive to buy and operate. The Sabreliner is similar in size and cost but less common in the used market, making parts and training harder to find.

Compared to turboprops like the Beechcraft King Air or the Cessna Caravan, the Citation I is faster and can fly higher, but it costs more to operate and requires more specialized training. Turboprops burn less fuel and can operate from shorter runways, making them better for remote operations. Jets are better for longer flights and higher-altitude operations where speed matters.

Newer light jets like the Embraer Phenom 100 or the Cirrus Vision Jet offer better avionics, more comfortable cabins, and lower operating costs, but they cost significantly more to purchase — typically $3 million to $6 million for a new aircraft. For buyers with a limited budget, the used Citation I remains an attractive option despite its age.

Common issues and what to look for when buying

Potential buyers should have any Citation I inspected by a may have access to mechanic before purchase. Several issues are common in older aircraft. Corrosion in the fuselage and wings is a concern, particularly in aircraft that have been stored outdoors or operated in coastal environments. Cracked windscreens are expensive to replace and should be checked carefully. Worn landing gear and brake components are normal wear items but can be costly to overhaul.

Avionics are often outdated in older Citation I aircraft. Many still have original steam gauges or early-generation glass cockpits that lack modern navigation and safety features. Upgrading avionics can cost $200,000 to $500,000 depending on what systems are installed, so this should be factored into the purchase decision. Interior condition varies widely — some aircraft have been meticulously maintained with new leather and carpeting, while others have original 1970s interiors that are worn and dated.

Engine condition is critical. Request detailed maintenance records and ask about any engine overhauls or major repairs. An engine approaching its overhaul limit is a significant liability — the new owner will face a $400,000 to $600,000 bill within a few years. Some sellers will negotiate a lower price if an engine is near overhaul, but this should be reflected in the purchase price.

Frequently Asked Questions

How many people can a Citation I carry?

The Citation I is certified to carry six to eight people total, including the two required pilots. This leaves four to six seats for passengers, depending on fuel load and weight distribution. Some configurations have been modified to carry more passengers on shorter flights where fuel reserves are not needed.

Can a single pilot fly a Citation I?

No. Federal regulations require two pilots in the cockpit at all times when operating a Citation I. Both pilots must hold a commercial license, a multi-engine rating, and a type rating specific to the Citation I. This is a safety requirement and cannot be waived.

What is the difference between a Citation I and a Citation II?

The Citation II, introduced in 1977, is larger and more powerful than the Citation I. It has more powerful engines, a larger cabin, longer range, and higher cruise speed. The Citation II costs more to buy and operate, but it can carry more passengers and fly longer distances. The two aircraft are not interchangeable — pilots need separate type ratings for each.

How long can a Citation I fly without refueling?

With full fuel and no reserves, a Citation I can fly roughly 1,700 nautical miles. In practice, federal regulations require pilots to carry reserves — at least 45 minutes of fuel at the destination plus fuel to reach an alternate airport — so actual range is closer to 1,400 to 1,500 nautical miles depending on winds and weight.

Is the Citation I still in production?

No. Cessna stopped producing the Citation I in 1989. All Citation I aircraft in service today are used aircraft, typically 35 to 50 years old. Cessna continues to produce newer Citation models like the Citation X and Citation Longitude, but these are much larger and more expensive aircraft.