Cessna 441 Conquest II

Business Jet Traveler » October 2008
Wednesday, October 1, 2008 - 5:00am

Airplanes come apart in midair for a variety of reasons. An errant pilot loses control or flies a model past its design limit, or unrepaired cracks and corrosion cause structure to fail. Fortunately, rigorous pilot training and aircraft maintenance standards make such events few and far between. Even rarer is the case when a design flaw brings down a relatively new airplane. Cessna, however, was facing that nightmare scenario in 1977 with its Model 441 Conquest II.

During the 1960s, the company had developed its 400 series of large-cabin piston twins; then, in 1972, it introduced the first Citation fanjet. But the 1973 Arab oil embargo and the continuing popularity of competing turboprops, such as the Beechcraft King Air, convinced Cessna to morph two of its piston twins-the 404 and the 421-into turboprops. The 441 is the larger of the two; the other is the Model 425 Conquest I. The 441 has executive seating for seven, although you can cram in nine passengers; it also has a top speed of 295 knots-higher with a popular engine modification-and a range of 1,200 to 2,200 nautical miles, depending on altitude and power setting.

Customer deliveries of the $895,000 Model 441 began in September 1977. Just two months later, the sixth airplane off the production line came apart over Greensboro, Ala., killing all seven aboard. The engines were working fine and weather wasn't a factor. That crash triggered the FAA's grounding of the entire 441 fleet-twice-between 1977 and 1979. Cessna ended up redesigning key tail-section components, retrofitting the entire fleet and providing customers with loaner aircraft. The program affected nearly 100 airplanes and still stands as one of the largest and most expensive factory field modifications of a business aircraft ever.

The 441 went out of production in 1986-the year of general aviation's modern nadir-after 362 were built. By then, the price of a new one had risen to $1.795 million. Of the approximately 320 still flying, the average accumulated flight time is 8,000 hours. The average operator flies about 294 hours a year.

Used 441s hold their value well. In good condition, they still command $1.2 million to $1.7 million and many operators lavish their 441s with all the latest bells and whistles, including new paint, interior, video monitors, soundproofing and glass-panel avionics. Those upgrades can easily boost the investment past $3 million-about the price of a new (but smaller) Cessna Citation Mustang entry-level twinjet.

"The airplane is in tight supply," said Jerry Griffith, a Tulsa, Okla. broker who specializes in the 441. Griffith cited its speed, range, fuel economy and comparably low engine maintenance costs as the chief reasons for its enduring popularity. "When you look at the amount of the investment, operating costs and capability, nothing else will do what this airplane does," Griffith added. A 441 with upgraded Honeywell TPE331-10 engines can take six passengers and their gear 1,200 nautical miles at speeds up to 311 knots at 35,000 feet-with an hourly fuel burn of 75 gallons. Down at 24,000 feet, it's even faster. Lighten the load and pull back the power and you can stretch a tank of gas out to 2,200 nautical miles, making 253 knots. The engines have a recommended time-between-overhaul (TBO) of 5,000 hours and cost about $175,000 each to overhaul. Those are much better numbers than the ones for the Pratts that power King Airs and Cheyennes. The Pratts on a King Air B200 have a TBO of 3,600 hours, drink 25 gallons an hour more and cruise 20 knots slower. The Honeywell Dash 10s also give good short runway performance and get to altitude fast, powering the climb at a rate of 2,435 feet per minute.

Cessna made many product improvements and retrofit kits available for the 441 during its nine-year production run-and the aftermarket added others. Chief among these was the Dash 10 engine conversion pioneered by West Star Aviation in Grand Junction, Colo. Most of the fleet has been converted to Dash 10 power, and because of the superior performance and maintenance intervals, you simply do not want a 441 without it. The conversion typically is done when the original Garrett TPE331 engines are timed out or need a mid-life inspection; the cost is north of $500,000 for two engines.

Stainless exhausts are another popular option and cost around $5,000 per side. The original fiberglass exhaust area is prone to cracking.

Next come the propellers. If your 441 hasn't been converted to four-blade Hartzell propellers already, consider it. The four blades yield 2.5 inches more ground clearance, reduce cabin noise, improve the climb rate by 200 feet per minute and add four to five knots of airspeed, according to Greg Thibodeau, airframe maintenance director at National Flight Services in Toledo, Ohio. Two new props, installed, run about $65,000.

National also offers winglets for the 441. Installation requires eight to 10 days of downtime and painting costs $14,000. Thibodeau said pilots report speed gains of three to five knots and that the winglets make the airplane "more stable about the roll axis."

Next come avionics. The factory-installed Cessna autopilots on this airplane are, to be blunt, junk-and about 70 percent of the 441s still flying have them. They are unreliable analog dinosaurs prone to failure, and parts are hard to get. Most 441s are flown single-pilot and you need a good autopilot to reduce pilot workload. Cessna figured this out eventually, installing Sperry SPZ500s on the last 20 airplanes out the door. Retrofits are primarily the Rockwell Collins APS-65 or the S-Tec 2100. Some operators already made the switch when they installed RVSM altimeters, which are now required to fly above 28,000 feet. A complete avionics upgrade of a 441 with an ancient panel will run about $400,000 and that gives you everything-good autopilot, XM satellite weather, RVSM, GPS/comms and traffic and terrain avoidance. The Avidyne Alliant integrated glass-panel system is also available.

Making a big investment in a 30-year-old airplane is not without risk, and operators must adhere to a rigorous, recently mandated inspection program for all 441s. The initial inspection under this program is pricey, anywhere from $120,000 to $180,000 or more, depending upon what is uncovered. The engines, propellers, de-icing boots, tail and landing gear must all be removed. Once the boots come off, you cannot put them back on-you have to buy new ones. Ka-ching.

The interior also comes out of the airplane as part of this initial inspection. This is a good time to refurbish. Turboprop cabins are generally noisy places and the 441's is no exception. However, a 50-pound Flight Environments sound-dampening package can cut  noise by up to nine decibels. In conjunction with an inspection, it takes a week to install and costs about $25,000. New paint and interior averages $75,000, unless you go crazy with cabin electronics.

The initial inspection takes four to eight weeks. Less intensive recurring inspections are required over the aircraft's life and will add $50 an hour to direct operating costs. Cessna is also limiting the life of a 441's airframe to 22,500 hours (about 77 years of average use), but that limit applies only to aircraft flown commercially-although some insurers will also apply that standard to private-use aircraft.

Cessna claims the new inspection and life-limit rules are necessary. "Our main concern is corrosion related to the age of these airplanes," said Steve Howard, Cessna's manager of field service for propeller aircraft. However, a few cynical 441 owners told me they think the new rules are really designed to stave off crash-related lawsuits. In 1994, Congress eliminated aircraft manufacturers' product liability for aircraft that are more than 18 years old unless those aircraft are used for a variety of commercial purposes. The rules also don't cover lawsuits filed outside the U.S., where about one third of the 441 fleet resides.

But most 441 owners have taken the new inspections rules in stride and are using them as an opportunity to refurbish and add equipment, according to West Star's vice president of business development, Russ Williams. "They're not asking, 'How much?'" Williams commented. "They are asking, 'When can I get my airplane back?'"

Williams said there is a compelling reason for this. "No twin-engine turboprop that I know of is more efficient in terms of cost per seat mile and cost per hour," he explained. Not bad for a design that first took to the drawing board in 1974.

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No Avatar
Matt H
on August 4, 2012 - 9:33pm

My dad was one of the 7 people on that plane that came apart in 1977. I was trying to find more details.

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Ainsley C Warmuth
on March 13, 2014 - 7:34am

My father, Bobby Cardinal with Dixie Air. Inc., was also killed in this crash. You can do an internet search for the official NTSB report. I have a copy of the report, as well as several newspaper articles about the crash.

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Terry Hunnicutt
on August 30, 2013 - 10:24pm

My brother, Jack hunnicutt was one of the 7 killed on that plane when it came apart, he was the pilot for Mercury Fright Lines, I think this is the only time he was on an airplane that he wasn't sitting in the pilots seat, I still have a bery hard time with this taday, he was my hero

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