After first rejecting an idea to develop the Grumman Widgeon as an executive transport, the company studied producing an executive transport based on a turbine-powered variant of the naval utility transport Grumman TF-1 Trader. The company had already determined that any new aircraft would have to be turboprop-powered and the Rolls-Royce Dart engine was chosen. Further studies showed that the Trader-based design would not sell and they needed an all-new design with a low-wing and room to stand up in the cabin. In June 1957 the design of G-159 was finalised and Grumman started selling slots on the production line at $10,000 each. The initial customers worked with Grumman on the detailed design and avionics fit. The G-159 was given the name Gulfstream and on 14 August 1958 the first aircraft, registered N701G, took off from Bethpage, New York on its maiden flight. By 2 May 1959 the aircraft was awarded a type certificate by the Federal Aviation Administration (FAA).
The Gulfstream I is a low-wing cantilever monoplane with a semi-monocoque aluminium alloy fuselage structure. The aircraft is powered by two Rolls-Royce Dart turboprops with Rotol four-bladed constant speed propellers. The Gulfstream I has a retractable tricycle landing gear, with twin wheels on the two main units and the nose gear. The cabin is designed to take up to twenty-four passengers in a high-density arrangement or only eight in an executive layout, although ten to twelve was more usual. The aircraft has a hydraulically operated airstair in the forward cabin for entry and exit.
The United States military version for this plane is the C-4 Academe. The TC-4 is a version with added instruments and navigation. It was used by the US Navy for bombardier/navigator training for the A-6 Intruder. A VC-4A variant was flown by the United States Coast Guard as an executive transport until the early 1980s. It was later used as a logistics and long-range command and control aircraft until 2001.[3]
A 37-passenger stretched version, the G-159C, was developed by Gulfstream for regional airline use. Five were delivered from November 1980.[4] Air North (based in Plattsburgh NY and which subsequently changed its name to Brockway Air) was one of the few airlines in the U.S. to use this version before its acquisitionbyBrockway Glass. Another Gulfstream I-C airline operator was Chaparral Airlines which flew passenger services as American Eagle via a codesharing agreement with American Airlines. Royale Airlines also operated the G-I in scheduled passenger service in the U.S. operating as Continental Connection on behalf of Continental Airlines; however, its aircraft were standard length G-159 models and thus were not the stretched version. Several other airlines in the U.S. as well. Air carriers in Africa, Canada, Europe and the Mideast also operated standard Gulfstream Is in scheduled passenger service, including Peregrine Air Services in the U.K., which operated airline flights for British Airways.
Twin-engined executive, corporate transport aircraft with accommodation for up to 14 passengers, powered by two 2,210-shp (1648-kW) Rolls-Royce Dart RDa.7/2 Mk 529-8X turboprop engines. 200 built.
G-159C Gulfstream I-C
Stretched regional airline version. Five G-I aircraft were converted into Gulfstream I-Cs, by having the fuselage lengthened by 10 ft 8 in (3.25 m) to provide seating for up to 37 passengers.
VC-4A
VIP transport version for the US Coast Guard. One built.
TC-4B
United States military designation for a cancelled order for ten aircraft for the United States Navy for the navigation training and transport duties.
TC-4C Academe
TC-4C aircraft used by VA-42 at Davis-Monthan in 2018
United States military designation for a bombardier, navigator trainer for the US Navy and Marine Corps, first flown in 1967. Aircraft were fitted with a Grumman A-6 Intruder nose radome, a simulated A-6 cockpit and four bombardier/navigator consoles for A-6 crew training, nine built. The aircraft used by VA-42 was last seen in 2018 at the Davis-Monthan Air Force Base, 309th Aerospace Maintenance and Regeneration Group (AMARG). The "Green Pawn" emblem is still visible on the tail.
Most of the 200 Gulfstream I propjets were operated by corporate customers, with a smaller number operated by regional or commuter airlines as well as by government agencies and the military. NASA, the U.S. space agency, flew the Gulfstream I as a passenger transport aircraft and operated seven G-Is. Throughout the 1970s and mid-80s the Ford Motor Company operated a G-1 for their executives in Brazil. The Walt Disney Company operated Gulfstream S.N. 121 with the factory assigned tail number N732G from December of 1963 to October 4, 1967, when it was changed to N234MM.
Air North - Former scheduled passenger airline operator of the stretched, 37-passenger Gulfstream I-C. Air North, which operated in the northeast U.S., subsequently changed its name to Brockway Air.
Air US - Former scheduled passenger airline operator flying several commuter routes from DenverStapleton International Airport (DEN). Fleet included stretched, 37-passenger Gulfstream I-C aircraft.
NASA - Former operator with seven G-I aircraft being used to transport NASA and space program contractor personnel between the civilian space agency's various centers and facilities in the U.S.
United States Army - The United States Army Corps of Engineers operated a single Gulfstream I (with a civilian colour scheme and registration) between 1961 and 1981. The US Army also later received at least one Gulfstream I that had been confiscated from drug dealers.[11]
Frawley, Gerard (2003). The International Directory of Civil Aircraft, 2003-2004. Fyshwick, ACT, Australia: Aerospace Publications Pty Ltd. p. 132. ISBN1-875671-58-7.
Harding, Stephen (1990). U.S. Army Aircraft Since 1947. Shrewsbury, UK: Airlife. ISBN1-85310-102-8.
Taylor, John W. R. (1965). Jane's All The World's Aircraft 1965-66. London: Samson Low, Marston.
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