The 681 was certified on March 20, 1969. The 681 is identical to the 680W except for the pressurization equipment. The 681 utilizes an engine bleed air pressurization system instead of Hydraulic pressurization system.
Specification Performance Kit Finder| Span | 44′ | 13.41m |
| Length (680T:680V) | 41.57′ | 12.67m |
| Length (680W) | 42.11' | 12.83m |
| Height | 14.60′ | 4.45m |
| Tread | 12.11′ | 3.69m |
| Cabin Entry Door | 3. 91’ x 2.18’ | 1.19 x 0.66m |
| Cabin Height (Inside Interior) | 4.′62 | 1.40m |
| Cabin Length | 14.22′ | 4.33m |
| Cabin Width (Inside Interior) | 4.33′ | 1.31m |
| Cabin Volume (incl cockpit) | 224 ft³ | 68.27m³ |
| Baggage compartment height | 3′ | 0.91m |
| Baggage compartment width | 3.81′ | 1.16m |
| Baggage compartment length | 4.83′ | 1.47m |
| Baggage compartment volume | 41.8 ft³ | 12.74 m³ |
| Baggage door height | 2.54′ | 0.77m |
| Baggage door width | 1.58′ | 0.48m |
| Baggage compartment load limit | xxx lbs | xxx kg |
Hamilton Standard Hub 33LF-325 - Blades (3) I033A-0
Honeywell (Garrett) TPE331-43-BL
| Ramp Weight: | 9450 lbs./ 4286 Kg |
| Take-off Weight: | 9400 lbs./ 4263 Kg |
| Landing Weight: | 9000 lbs./ 4082 Kg |
| Standard Empty Weight: | 5515 lbs./ 2501 Kg |
| Useful Load: | 3935 lbs./ 1784 Kg |
| Zero Fuel Weight: | 8500 lbs./ 3855 Kg |
| Baggage Load Limit: | 500 lbs./ 226 Kg |
Normal Cruise (10,000 Ft Max Cruise Power) (TAS) | 278 MPH / 242 KTS |
| Normal Cruise (21,000 Ft 96% Cruise Power Avg.) (TAS) | 263 MPH / 228 KTS |
| Twin Engine Best Rate of Climb Speed (CAS): | xxxmph/xxxkts |
| Twin Engine Best Angle of Climb Speed (CAS): | xxxmph/xxxkts |
| Single Engine Best Rate of Climb Speed (CAS): | xxxmph/xxxkts |
| Single Engine Best Angle of Climb Speed (CAS): | xxxmph/xxxkts |
| Minimum Single Engine Control Speed (CAS) | 102 MPH / 89 KTS |
| Stall Speed (Clean, CAS) | 102 MPH / 89 KTS |
| Stall Speed (Dirty, CAS) | 94 MPH / 81 KTS |
| Stall Speed, Gear and Flaps Down (CAS): | xxmph/xxkts |
| Cruise Range (Standard Fuel, No Reserve) | 1244 SM / 1081 NM |
| Cruise Range (Auxiliary Fuel, No Reserve) | 1491 SM / 1296 NM |
| Cruise Range (Standard Fuel, 45 min Reserve) | 1062 SM / 923 NM |
| Cruise Range (Auxiliary Fuel, 45 Min. Reserve) | 1315 SM / 1143 NM |
| Best rate of Climb Speed | 120 MPH / 104 KTS |
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