Twin Commander 840
| Basics | |
| Price New | $1.4M |
| Year Started | 1980 |
| Year Ended | 1984 |
| Pilots Required | 2 |
| Cabin | |
| Passengers (Typical) | 5 |
| Cabin Volume | 160 cu ft |
| Cabin Volume | 5 cu m |
| Cabin Height | 5 ft |
| Cabin Height | 1 m |
| Cabin Width | 4 ft |
| Cabin Width | 1 m |
| Cabin Length | 9 ft |
| Cabin Length | 3 m |
| Performance | |
| Range* | 875 nm |
| Range* | 1,408 km |
| Maximum Cruise Speed | 295 ktas |
| Maximum Cruise Speed | 546 km/hr |
| Maximum Takeoff Weight | 10,325 lb |
| Maximum Takeoff Weight | 4,683 kg |
| Payload with Maximum Fuel | Not Provided |
| Payload with Maximum Fuel | Not Provided |
| Maximum Altitude | 31,000 ft |
| Maximum Altitude | 9,449 m |
| Balanced Field Length | 4,000 ft |
| Balanced Field Length | 1,219 m |
*Range is the maximum IFR range of the aircraft traveling at Long Range Cruise speed with all passenger seats occupied. Range figures use the NBAA IFR alternate fuel reserve calculation for a 200 nautical mile alternate.