Engines are about 50k euro to overhaul, each I have two bits of advice. Contact Us. 5746 E Apache St. Tulsa, OK 74115 1072 NW 53rd St. Fort Lauderdale, FL 33309 Toll Free: 877-833-6948 Fax: 918-835-2804 Mon-Fri: 7:30 AM to 6:30 PM EST Box 5219 • 7505 Karl May Drive Waco Regional Airport (KACT), Building 409 Waco, TX 76708 Cessna 1974 - 421B Multi Engine Piston Model: CESSNA 421 Year: 1974 Serial Numbers: 421B-0501 § -0665 Trend: Engine Takeoff Power: Cont 375hp • GTSIO-520-H Average Overhaul $ Installed: 65,000 ea Engine TBO Hours: 1200 Max Seats: 8 Appraisal Points: Aircraft Operating Costs Per Hour and Aircraft comparisons, ... CESSNA. The 421C improves on this with improved fuel and gear system. Operating costs are similar to the other 400 series Cessna's with the exception of a slightly higher fuel burn and significantly higher overhaul costs. There is no RAM engine mod for the 421 series. The Twin Cessna forum is a vast archive of knowledge. History The 421, which shares its basic airframe with most of the other 400-series Cessna twins, was introduced in 1968. Invest about 0.2% of what a 421 will cost to join Cessna Pilots Association. The only RAM engine mod for the 421 engine is a switch to the late series heavy case 7th Stud engine which has a 1600 hr TBO versus the original 1200hrs. Many owners find these increase costs are more than offset by the superb performance and comfort the 421 offers. However, the 421 uses unusual geared engines that must be operated with care, and have seriously high overhaul costs. 1972 CESSNA 421B Golden Eagle - Specifications, Performance, Operating cost, Valuation, Brokers - planephd.com 421C GOLDEN EAGLE'81. The 421 is arguably the best cabin-class piston twin ever made. Twin engine piston aircraft with retractable landing gear. The extra fuel burn and higher cost of engine overhaul do add some cost, on the order of 5-8 GPH and $30/hr extra for engine and prop reserve (big prop). The mod allows the existing direct drive TSIO 520 engines to pull more boost so they can deliver 325 HP (Series IV ) or 335 HP (Series VI, VII). RAM Aircraft, L.P. 8am – 5pm - Monday thru Friday P.O. Turning a third faster ... Operating Costs with Engine/Prop Overhaul Reserve: $650 per hour Purchase prices run from less than $100,000 for an early model to $500,000 plus for a Operating Costs Per Hour; Fuel Cost Per Hour ... $ 5.43: Fuel Type : 100LL Average Engine Cost : $ 59,688.00: Average Prop Cost : $ 15,712.00: Engine Manufacturer : Continental: Average Cost Per Nautical Mile: $ 1.55 Home. You could spend days reading about every nuance of 421 ownership and operations. I believe this is a fairly accurate post based on a decade of working on and around engines, thinking about engines, driving cars, riding motorcycles and flying airplanes. Cessna developed the 421 to compete with the turboprops of the day and the geared engine was a way to improve performance and increase comfort. 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