Overview

The Piper PA-31 Navajo is the airplane that created the entry-level cabin-class twin: a low-wing, eight-seat piston twin with an airstair door, a center-aisle cabin, and a pair of 310 hp turbocharged Lycoming TIO-540 engines. Certificated under FAA Type Certificate A20SO in February 1966 and built at Lock Haven through the early 1980s, the Navajo gave charter and corporate operators a true cabin-class ride: walk-in airstair entry and a center-aisle cabin, at a fraction of the cost of the pressurised twins and light turboprops above it. It is the parent of an entire family: the stretched PA-31-350 Chieftain, the pressurised PA-31P, and the late piston-Cheyenne PA-31P-350 Mojave all descend from this airframe.

The trade for that capability is conventional engine rotation. Both TIO-540-A2C engines turn the same way, so an engine failure leaves a defined critical engine and a real directional-control task, the handling problem Piper later cured on the Chieftain with counter-rotating propellers. Turbocharging holds the 310 hp to high altitude, giving the Navajo the legs to top weather and terrain that ground a normally aspirated twin, and a useful load above 2,500 lb makes it a genuine load-hauler. The Navajo belongs to the operator who fills it: the Part 135 charter or owner-flier who needs eight seats, a useful load above 2,500 pounds, and walk-in airstair access on a piston budget. It is a working airplane bought by people who keep it loaded, not by owners after an easy step-up.

Key Features for GA Buyers

• Cabin-class comfort. Club seating for four behind the crew, an airstair entry door, and a center-aisle cabin give the Navajo interior volume and headroom that lighter twins cannot match.
• Turbocharged altitude capability. Twin 310 hp TIO-540-A2C engines hold sea-level power to roughly 15,800 ft, letting the Navajo cruise near 194 KIAS in the mid-to-high teens and climb over weather that traps normally aspirated twins.
• True load-hauler. Useful load above 2,500 lb supports a full cabin and meaningful fuel at the same time, the payload-with-range that lighter twins must trade one for the other to reach.
• Deep support base. Decades of Part 135 charter and freight service mean type-experienced mechanics, parts, and training are widely available, an advantage over rarer cabin-class twins.

Trade-offs

• Conventional rotation. Both engines turn the same way, so the Navajo has a critical engine and a more demanding engine-out directional task than the counter-rotating Chieftain, a reason insurers scrutinize multi-engine time closely.
• Fuel and maintenance. Cruise burn around 36-40 GPH total, turbocharged-engine thermal management, and retractable gear put operating and annual costs well above any light twin; the economics work when seats or cargo are filled.
• Unpressurised. Cabin comfort is cabin-class, but without pressurisation the practical cruise sits in the low-to-mid teens; the pressurised PA-31P and PA-31P-350 Mojave siblings exist precisely for higher, smoother flight levels.
• Insurance and currency. As a heavy, high-performance, turbocharged twin, the Navajo sits in a strict pilot-experience and recurrent-training bracket; budget for recurrent training and multi-engine currency each year.

See Also

• Piper PA-31-350 Chieftain – the stretched, counter-rotating, 350 hp commuter development of this airframe. Compare
• Piper PA-31P Pressurized Navajo – the pressurised family member for true flight-level cabin comfort. Compare
• Cessna 402 – the Wichita commuter-twin rival in the same charter and freight mission. Compare
• Beechcraft Baron 58 – the lighter, faster cabin-class twin for owner-flown missions with smaller loads. Compare
• Cessna 421C Golden Eagle – the step up to a pressurised piston twin in the same cabin-class bracket. Compare