Models

685

The 685 was certified on September 17, 1971 per CAR 3. The 685 has a gross weight of 9000 pounds and is basically the same as the 690 with the following exceptions: Continental engines GTSIO520-K, Slight change in wing structure at the engine attach area, the picture window was divided into two individual windows in the pressure cabin and structural changes to the fuselage. The 685 was the final iteration of piston powered Twin Commander designs.

Note: All Specifications & Performances Data provided below are for Reference Only. See Piston Commander 685 TCDS, POH/AFM, & ICA's for Model & S/N specific Specification & Performance Data.

Specification Performance Kit Finder
685

Specifications

Dimensions

Span46.66′14.22m
Length42.11′12.83m
Height14.11′4.30m
Tread15.50′4.72m
Cabin Entry Door3. 91’ x 2.21’1.19 x 0.67m
Cabin Height (Inside Interior)4.55'1.38m
Cabin Length14.41′4.39m
Cabin Width (Inside Interior)4.33′1.31m
Cabin Volume (incl cockpit)224 ft³68.27m³
Baggage compartment height3′0.91m
Baggage compartment width3.83′1.16m
Baggage compartment length4.83′1.47m
Baggage compartment volume43 ft³13.10 m³
Baggage door height2.60′0.79m
Baggage door width1.64′0.49m
Baggage compartment load limit600 lbs272 kg
685

Propellers

Hartzell C8475+2/FC8475+2 (blades) / HC-H3YN-2/-2F (Hubs)

Power Plant

Continental GTSIO-520-F /-K

Weights - Aircraft

Max Ramp Weight:9050 lbs / 4105 kg
Take-off Weight:9000 lbs / 4082 kg
Landing Weight:9000 lbs / 4082 kg
Standard Empty Weight:6021 lbs / 2731 kg
Useful Load:3029 lbs / 1373 kg
Baggage Compartment Load Limit:

600 lbs / 272 kg

685
685

Performance

Operating Speed

Max Speed (100%) (TAS)278 mph / 242 kts
Normal Cruise (24,000 Ft) (TAS)255 mph / 222 kts
Normal Cruise (10,000 Ft) (TAS)230 mph / 200 kts
Minimum Single Engine Control Speed (CAS)89 mph / 77 kts
Stall Speed (Clean, CAS)

93 mph / 81 kts

Stall Speed (Dirty, CAS)86 mph / 75 kts
Cruise Range (Standard Fuel, No Reserve)1440 SM / 1251 NM
Cruise Range (Auxiliary Fuel, No Reserve)1904 SM / 1655 NM
Cruise Range (Standard Fuel, 45 min Reserve)1274 SM / 1107 NM
Cruise Range (Auxiliary Fuel, 45 Min. Reserve)1731 SM / 1504 NM

Cruising Ranges

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