Appearing circa 1970, the Aero Commander was under ATC 2A7 and A3SW.
Two civil 680 went to the USAF as U-4B, 55-4647 and 55-4648, and four to Army, 56-4023 to 56-4026, later becoming U-9C.
The US Army tested electronics systems with the one NL-26D, 57-6531, and tested side-looking radar (SLAR) with RL-26D 57-6183 and 57-6184, plus three modified from L-26C. They later became NL-9D and RU-9D. Two more were built, but destroyed in pre-delivery accidents.
Aero Commander 680 Super in production in late 1955.
The Aero Commander 680-E (ATC 2A4) appeared in 1958.
The 680F first appeared in 1964.
First flown on 31 December 1964, the first turbo-prop Commander, the 680T, appeared in 1966. The 680T was to all intents and purposes, a turbine-engined edition of the pressurised Grand Commander, the nine seat 680FLP.
The 1967 680V featured picture windows and clamshell gear doors.
The 680W appeared in 1968.
The 1969 680T Turbo II, Hawk Commander ATC (2A4) was priced at $369,500.
680
Engines: 2 x 290hp Lycoming IO-540
Wingspan: 34’3″
Length: 34’10”
Useful load: 2075 lb
Max speed: 260 mph
Cruise speed: 250 mph
Stall: 77 mph
Range: 1400 mi
Ceiling: 22,000′
680-E
Engines: 2 x 320hp Lycoming GSO-480B-A6
Wingspan: 49’6″
Length: 35’1″
Gross wt: 7500 lb
Max speed: 255 mph
Cruise speed: 226 mph
Stall: 85 mph
Range: 1400 mi
Seats: 4-6
680F
Engines: 2 x Lycoming IGSO 540, 380 hp.
TBO: 1,200 hr.
680T
Engine: 2 x 575hp AiResearch TPE-331 (605hp TPE-331-43 in 1965)
680T Turbo II, Hawk Commander
Engines: 2 x 500hp Garret AiResearch TPE-331
Wingspan: 44’0″
Length: 43’0″
Useful load: 3935 lb
Max speed: 290 mph
Cruise speed: 268 mph
Stall: 94 mph
Range: 1490 mi
Ceiling: 25,600′
Seats: 7-9
680V
Engines: 2 x TPE-331-43BL
Gross wt: 9400 lb
681B Turbo Commander
Wingspan: 44’1″
Length: 42’11”
Max speed: 390 mph
Cruise speed: 278 mph
Range: 1315 mi
MR.RPM Turbo 800 / Aero Commander 680F
Engines: 2 x Lycoming IO-720-B1A, 400 hp
Seats: 7
Wing loading: 31.4 lb/sq.ft
Pwr loading: 10 lb/hp
Max TO wt: 8000 lb
Empty wt: 4841 lb
Equipped useful load: 2800 lb
Service ceiling: 31,000 ft
Payload max fuel: 1462 lb
75% cruise: 226 kt
Range max fuel/ 75% cruise: 980 nm/4.3 hr
55% cruise: 200 kt
Range max fuel / 55% cruise: 1130 nm/ 5.7 hr
Vmc: 78 kt
Stall: 67-76 kt
1.3 Vso: 87 kt
ROC: 1390 fpm
SE ROC: 262 fpm @ 100 kt
SE ceiling: 14,800 ft
Fuel cap: 1338 lb
Min field length: 1972 ft
MR.RPM Turbo 800L / Aero Commander 680FL
Engines: 2 x Lycoming IO-720-B1A, 400 hp
Seats: 8-11
Wing loading: 33.3 lb/sq.ft
Pwr loading: 10.6 lb/hp
Max TO wt: 8500 lb
Empty wt: 5541 lb
Equipped useful load: 2600 lb
Service ceiling: 31,000 ft
Payload max fuel: 1262 lb
Vmc: 78 kt
Range max fuel/ 75% cruise: 980 nm/4.3 hr
Stall: 72-75 kt
Range max fuel / 55% cruise: 1130 nm/ 5.7 hr
1.3 Vso: 94 kt
75% cruise: 226 kt
55% cruise: 200 kt
ROC: 1250 fpm
SE ROC: 201 fpm @ 100 kt
SE ceiling: 12,800 ft
Min field length: 2350 ft
Cabin press: 3.2 psi
Fuel cap: 1338 lb
L-26C
1956 civil 680
Engines: 2 x 320hp supercharged Lycoming GSO-480B
Wingspan: 44’0″
Max speed: 255 mph
Cruise: 198 mph
Range: 1500 mi
Ceiling: 22,900′
All Aero 