Gulfstream IV

Gulfstream IV
source
Name	Gulfstream IV
Type	Business jet
National origin	United States
Manufacturer	Gulfstream Aerospace
First flight	19 September 1985
Introduction	1987
Status	In service
Primary user	Corporate operators, U.S. government
Produced	1987–1992
Number built	535
Developed from	Gulfstream III
Developed into	Gulfstream V

Gulfstream IV. The Gulfstream IV is a twin-engine business jet developed and manufactured by Gulfstream Aerospace in the United States. Introduced in 1987 as a successor to the Gulfstream III, it featured a new supercritical airfoil wing, advanced avionics, and more efficient Rolls-Royce Tay turbofan engines. The aircraft established new benchmarks for range, speed, and cabin comfort in its class, becoming a mainstay for corporate aviation, head of state transport, and special missions for entities like the United States Air Force.

Development and design

The program was launched in 1983 under the leadership of Gulfstream Aerospace to create a significant advancement over the Gulfstream III. Key design partners included Grumman for wing design and Rolls-Royce, which developed the new Tay engine. The airframe incorporated a new supercritical airfoil designed by a team that included renowned engineer John McMasters, dramatically improving aerodynamic efficiency. The cockpit was equipped with a then-revolutionary Honeywell glass cockpit known as the PlaneView system, replacing traditional analog gauges. Certification from the Federal Aviation Administration was achieved in 1987 after a rigorous flight test program.

Operational history

Upon entry into service, the aircraft was rapidly adopted by major Fortune 500 companies and wealthy individuals for its transcontinental range and spacious cabin. It became a common sight at airports like Teterboro Airport and Farnborough Airshow. Several airframes were acquired by the Government of the United States for roles including the United States Air Force C-20F/G transports and the United States Coast Guard C-20A for logistics support. The type also served as a platform for aerial reconnaissance and flight inspection duties for agencies including the Japan Civil Aviation Bureau. Its reliability and performance cemented its reputation, leading to strong residual values on the used aircraft market.

Variants

The primary model was the standard Gulfstream IV, followed by the extended-range Gulfstream IV-SP with increased fuel tank capacity. A dedicated special missions variant, the Gulfstream IV-SC, was configured for surveillance and command and control roles. The military derivative for the United States Air Force was designated the C-20F and C-20G, used for VIP transport and personnel movement. The United States Navy operated a similar model, while the Japan Air Self-Defense Force utilized the U-4 multi-utility transport. These variants shared the core airframe but featured specialized avionics and interior configurations.

Operators

Primary operators have included global corporations such as General Electric, ExxonMobil, and Toyota. Government and military operators span multiple nations, including the United States Department of Defense, the Royal Air Force (as the 32 Squadron Royal Flight), and the Government of Japan. Other state users have included the Government of Turkey, the Government of Saudi Arabia, and the Government of Malaysia. The aircraft is also commonly available for charter through fractional ownership programs like NetJets and operators based at London Luton Airport and Geneva Airport.

Specifications (GIV)

* **Crew:** 2 pilots + 1-2 cabin attendants * **Capacity:** 12–19 passengers * **Length:** 88 ft 4 in (26.92 m) * **Wingspan:** 77 ft 10 in (23.72 m) * **Height:** 24 ft 6 in (7.47 m) * **Empty weight:** 46,500 lb (21,092 kg) * **Max takeoff weight:** 74,600 lb (33,838 kg) * **Powerplant:** 2 × Rolls-Royce Tay Mk 611-8 turbofan engines, 13,850 lbf (61.6 kN) thrust each * **Maximum speed:** Mach 0.88 * **Range:** 4,220 nmi (7,815 km) * **Service ceiling:** 45,000 ft (13,716 m) * **Avionics:** Honeywell SPZ-8000 flight management system

Accidents and incidents

Notable accidents include the 1991 crash of a corporate flight near Steamboat Springs, Colorado, which led to National Transportation Safety Board recommendations on icing conditions. In 1999, a Gulfstream IV operated by PGA golfer Payne Stewart suffered a pressurization system failure, leading to a catastrophic hypoxia event; the aircraft crashed in South Dakota after being intercepted by North American Aerospace Defense Command fighters. A 2014 accident at Hanscom Field in Massachusetts involving a aircraft operated by a subsidiary of General Dynamics resulted in fatalities and prompted an Federal Aviation Administration review of approach and landing procedures.