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The Piper PA-42 Cheyenne III is a larger development of the earlier turboprop PA-31T Cheyennes I and II. It was announced in September 1977 and the first production aircraft flew on 18 May, 1979. FAA certification was granted in early 1980 and deliveries of production Cheyenne IIIs began on 30 June, 1980.
The Cheyenne III is about 1 m longer than the Cheyenne II. It is powered by two 720m shp PT6A-41 turboprops driving three blade constant speed Hartzell propellers, and was given a T-tail. There is typically seating for six in the main cabin, in corporate configuration, with one or two pilots in the flight deck. The aircraft can operate out of short hot and high runways, and landing is shortened by the rotating speedbrake effect of the propellers in beta pitch.
Development and improvement of the III led to the PA-42-720 Cheyenne IIIA, with PT6A-61 engines, a higher service ceiling and revised systems and interior.
The PA-42-1000 Cheyenne IV is higher powered and faster thanks to 1000 hp Garrett TPE-331 turboprops driving four blade propellers. It took its first flight on 23 February, 1983 and was certified in 1984. It was renamed the Cheyenne 400LS when Lear Siegler owned Piper, then the Cheyenne 400; its top speed being over 400 mpg. First flown on 23 February, 1983, the Cheyenne 400 was delivered from late 1984.
PA-42 production ended in 1991.
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| World fleet | Charter fleet | Typical pax | Cabin volume | Cruise | Range | Years | |
| Piper PA42-3 Cheyenne III | ●● | ●● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●● | ●●●●●●●●●● |
| Piper PA42-3A Cheyenne IIIA | ●● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●● | ●●●●●●●●●● |
| Piper PA42-400 Cheyenne 400 | ●● | ● | ● | ●●●●●●●●● | ●●●●●●● | ●●●●●●●● | ●●●●●●●●●● |
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