Shuttle Training Aircraft

Last updated
Shuttle Training Aircraft
STA.jpg
RoleAdvanced trainer
Manufacturer Grumman
Retired2012
StatusRetired
Primary user NASA
Number built4
Developed from Grumman Gulfstream II

The Shuttle Training Aircraft (STA) is a former NASA training vehicle that duplicated the Space Shuttle's approach profile and handling qualities, allowing pilots to simulate Shuttle landings under controlled conditions before attempting the task on board the orbiter. The STA was also flown to assess weather conditions just prior to Space Shuttle launches and landings.

Contents

Development

NASA developed the STA using the Grumman Gulfstream II as the underlying aircraft platform. During the early phases of the Shuttle program, NASA considered using the Boeing 737 airliner as the basis for the STA, but rejected it due to cost and opted for the less-expensive Gulfstream II. [1]

The aircraft's exterior was modified to withstand the high aerodynamic forces incurred during training sorties. A redesigned cockpit provided a high-fidelity simulation of the Shuttle Orbiter's controls and pilot vantage point; even the seats were fitted in the same position as those in the Space Shuttle.

Operational history

The four STAs were normally located at the NASA Forward Operating Location in El Paso, Texas and rotated through Ellington Field (Houston, Texas) for maintenance. [2] The STA was also used at Kennedy Space Center in Florida. It was primarily flown by astronauts practicing landings at the Shuttle Landing Facility and White Sands Space Harbor as well as to assess weather conditions prior to Space Shuttle launches and landings.

On December 3, 2003, a NASA Gulfstream II Shuttle Training Aircraft (STA) was flying a series of simulated shuttle landings to the Kennedy Space Center shuttle landing facility. On board the aircraft was an unidentified NASA astronaut pilot and two training personnel. The aircraft was on final approach at 13,000 feet when onboard instruments indicated a malfunction on one of the jet engine thrust reversers. The aircraft landed safely. A post-landing inspection showed that one of the 585-pound, 4-foot-wide, 5-foot-long thrust reversers had fallen off the aircraft. Divers later found the thrust reverser on the bottom of the nearby Banana River. An investigation showed that a bolt failed, releasing the part from the aircraft. [3] [4]

Flight profile

The STA was particularly critical for Shuttle pilots in training because the Orbiter lacked atmospheric engines that would allow the craft to "go around" after a poor approach. After re-entry, the Shuttle was a very heavy glider (it was affectionately referred to as a 'flying brick') and as such had only one chance to land successfully.

An STA flying above Discovery as it lands at the conclusion of STS-95 in 1998 KSC-98EC-1565.jpg
An STA flying above Discovery as it lands at the conclusion of STS-95 in 1998

To match the descent rate and drag profile of the real Shuttle at 37,000 feet (11,300 m), the main landing gear of the C-11A was lowered (the nose gear stayed retracted due to wind load constraints) and engine thrust was reversed. Its flaps could deflect upwards to decrease lift as well as downwards to increase lift.

Covers were placed on the left hand cockpit windows to provide the same view as from a Shuttle cockpit, and the left-hand pilot's seat was fitted with the same controls as a Shuttle. The STA's normal flight controls were moved to the right, where the instructor sat. Both seat positions had a head-up display (HUD).

In a normal exercise, the pilot descended to 20,000 feet (6,000 m) at an airspeed of 280 knots (519 km/h), 15 miles (24 km) from the landing target. The pilot then rolled the STA at 12,000 feet (3,700 m), 7 miles (11 km) from landing. The nose of the aircraft was then dropped to increase speed to 300 knots (560 km/h), descending at a 20-degree angle on the outer glide slope (OGS). The outer glide slope aiming point was 7,500 feet (2,286 m) short of the runway threshold, and used PAPIs for visual guidance in addition to the MLS system. At 2,000 feet (610 m) the guidance system changed to pre-flare and shortly after, at 1,700 feet (518 m), the pilot started the flare maneuver to gradually reduce the descent angle and transition to the inner glide slope (IGS) which was 1.5 degrees from 300 feet (91 m) onwards, using a "ball-bar" system for visual guidance. The shuttle landing gear release was simulated at 300 feet (90 m) above the ground, since the STA main gear remained down for the whole simulation. The nose gear of the STA was lowered at 150 ft (46 m) AGL in case of an inadvertent touchdown with the runway surface.

If the speed was correct, a green light on the instrument panel simulated shuttle landing when the pilot's eyes were 32 feet (10 m) above the runway. This was the exact position that the pilot's head would be in during an actual landing. In the exercise, the STA was still flying 20 feet (6 m) above the ground. The instructor pilot deselected the simulation mode, stowed the thrust reversers, and the instructor executed a go-around, never actually landing the aircraft (on training approaches).

Avionics

The Shuttle Training Aircraft's cockpit. The commander's side of the cockpit, at left, featured a Shuttle-type heads-up display (HUD), rotational hand controller (RHC) used to fly the vehicle, and multi-function displays. The instructor pilot, who occupied the right-hand side of the STA cockpit, had access to a similar heads-up display, as well as conventional aircraft controls and instruments. Shuttle Landing Simulator cockpit.jpg
The Shuttle Training Aircraft's cockpit. The commander's side of the cockpit, at left, featured a Shuttle-type heads-up display (HUD), rotational hand controller (RHC) used to fly the vehicle, and multi-function displays. The instructor pilot, who occupied the right-hand side of the STA cockpit, had access to a similar heads-up display, as well as conventional aircraft controls and instruments.

A sophisticated computer system installed on board the STA simulated the flight dynamics of the orbiter with nearly perfect accuracy. The STA's highly realistic simulation of the orbiter was not limited to handling characteristics, but also implemented the shuttle control interfaces for the pilot.

An onboard computer called the Advanced Digital Avionics System (ADAS) controlled the Direct Lift Control (DLC) and the in-flight reverse thrust during Simulation Mode. [5]

Every shuttle commander practiced at least 1,000 landings in this manner, as had each mission's shuttle pilot. [2]

List of aircraft

Four Gulfstream II aircraft constituted the now retired STA fleet, although other Gulfstream II aircraft, lacking STA capabilities, are still used by NASA for personnel transport purposes. Although the majority of the fleet had markings similar to those pictured above, paint schemes do vary slightly across aircraft.

On August 22, 2011, NASA announced that all four Shuttle Training Aircraft would be retired at various NASA facilities around the country, with N944 retiring at the Dryden Flight Research Center. [6]

The STA tail numbers were:

See also

Related Research Articles

<span class="mw-page-title-main">Space Shuttle</span> Partially reusable launch system and space plane

The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was Space Transportation System (STS), taken from a 1969 plan for a system of reusable spacecraft where it was the only item funded for development.

<span class="mw-page-title-main">Apollo Lunar Module</span> NASA crewed Moon landing spacecraft (1969–1972)

The Apollo Lunar Module, originally designated the Lunar Excursion Module (LEM), was the lunar lander spacecraft that was flown between lunar orbit and the Moon's surface during the United States' Apollo program. It was the first crewed spacecraft to operate exclusively in the airless vacuum of space, and remains the only crewed vehicle to land anywhere beyond Earth.

<span class="mw-page-title-main">STS-1</span> First Space Shuttle mission, first orbital flight of the Space Shuttle Columbia

STS-1 was the first orbital spaceflight of NASA's Space Shuttle program. The first orbiter, Columbia, launched on April 12, 1981, and returned on April 14, 1981, 54.5 hours later, having orbited the Earth 37 times. Columbia carried a crew of two—mission commander John W. Young and pilot Robert L. Crippen. It was the first American crewed space flight since the Apollo–Soyuz Test Project (ASTP) in 1975. STS-1 was also the maiden test flight of a new American spacecraft to carry a crew, though it was preceded by atmospheric testing (ALT) of the orbiter and ground testing of the Space Shuttle system.

<span class="mw-page-title-main">North American X-15</span> Rocket-powered aircraft and spaceplane operated by the US Air Force and NASA

The North American X-15 is a hypersonic rocket-powered aircraft operated by the United States Air Force and the National Aeronautics and Space Administration (NASA) as part of the X-plane series of experimental aircraft. The X-15 set speed and altitude records in the 1960s, crossing the edge of outer space and returning with valuable data used in aircraft and spacecraft design. The X-15's highest speed, 4,520 miles per hour, was achieved on 3 October 1967, when William J. Knight flew at Mach 6.7 at an altitude of 102,100 feet (31,120 m), or 19.34 miles. This set the official world record for the highest speed ever recorded by a crewed, powered aircraft, which remains unbroken.

<span class="mw-page-title-main">Boeing X-20 Dyna-Soar</span> Research spaceplane by Boeing

The Boeing X-20 Dyna-Soar was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including aerial reconnaissance, bombing, space rescue, satellite maintenance, and as a space interceptor to sabotage enemy satellites. The program ran from October 24, 1957, to December 10, 1963, cost US$660 million, and was cancelled just after spacecraft construction had begun.

<span class="mw-page-title-main">Glass cockpit</span> Aircraft instrumentation system consisting primarily of multi-function electronic displays

A glass cockpit is an aircraft cockpit that features an array of electronic (digital) flight instrument displays, typically large LCD screens, rather than traditional analog dials and gauges. While a traditional cockpit relies on numerous mechanical gauges to display information, a glass cockpit uses several multi-function displays driven by flight management systems, that can be adjusted to display flight information as needed. This simplifies aircraft operation and navigation and allows pilots to focus only on the most pertinent information. They are also popular with airline companies as they usually eliminate the need for a flight engineer, saving costs. In recent years the technology has also become widely available in small aircraft.

<span class="mw-page-title-main">Richard N. Richards</span> US Navy aviator and Space Shuttle astronaut

Richard Noel "Dick" Richards, , is a retired American naval officer and aviator, test pilot, chemical engineer, and a former NASA astronaut. He flew aboard four Space Shuttle missions in the 1980s and 1990s.

<span class="mw-page-title-main">Joe Engle</span> American astronaut (b. 1932)

Joe Henry Engle is an American pilot, aeronautical engineer and former NASA astronaut. He was the commander of two Space Shuttle missions including STS-2 in 1981, the program's second orbital flight. He also flew two flights in the Shuttle program's 1977 Approach and Landing Tests. Engle is one of twelve pilots who flew the North American X-15, an experimental spaceplane jointly operated by the Air Force and NASA.

<span class="mw-page-title-main">C. Gordon Fullerton</span> American astronaut (1936–2013)

Charles Gordon Fullerton was a United States Air Force colonel, a USAF and NASA astronaut, and a research pilot at NASA's Dryden Flight Research Facility, Edwards, California. His assignments included a variety of flight research and support activities piloting NASA's B-52 launch aircraft, the Boeing 747 Shuttle Carrier Aircraft (SCA), and other multi-engine and high performance aircraft.

<span class="mw-page-title-main">Shuttle Carrier Aircraft</span> Extensively modified Boeing 747 airliners that NASA used to transport Space Shuttle orbiters

The Shuttle Carrier Aircraft (SCA) are two retired extensively modified Boeing 747 airliners that NASA used to transport Space Shuttle orbiters. One (N905NA) is a 747-100 model, while the other (N911NA) is a short-range 747-100SR.

<span class="mw-page-title-main">Thrust reversal</span> Temporary diversion of an aircraft engines thrust

Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances. Such devices affect the aircraft significantly and are considered important for safe operations by airlines. There have been accidents involving thrust reversal systems, including fatal ones.

<span class="mw-page-title-main">Lunar Landing Research Vehicle</span> Apollo human lunar landing training vehicle

The Bell Aerosystems Lunar Landing Research Vehicle was a Project Apollo era program to build a simulator for the Moon landings. The LLRVs were used by the FRC, now known as the NASA Armstrong Flight Research Center, at Edwards Air Force Base, California, to study and analyze piloting techniques needed to fly and land the Apollo Lunar Module in the Moon's low gravity environment.

<span class="mw-page-title-main">Northrop HL-10</span> Type of aircraft

The Northrop HL-10 was one of five US heavyweight lifting body designs flown at NASA's Flight Research Center in Edwards, California, from July 1966 to November 1975 to study and validate the concept of safely maneuvering and landing a low lift-over-drag vehicle designed for reentry from space. It was a NASA design and was built to evaluate "inverted airfoil" lifting body and delta planform. It currently is on display at the entrance to the Armstrong Flight Research Center at Edwards Air Force Base.

<span class="mw-page-title-main">TACA Flight 110</span> 1988 plane emergency landing

TACA Flight 110 was a scheduled international airline flight operated by TACA International Airlines, traveling from San Salvador to New Orleans, with a stopover in Belize City. On May 24, 1988, the flight encountered severe thunderstorm activity on its final approach to New Orleans International Airport. As a result, the brand new Boeing 737-300 suffered flameout in both engines while descending through a severe thunderstorm, but the pilots made a successful emergency landing on a grass levee adjacent to NASA's Michoud Assembly Facility, with no one aboard sustaining more than a few minor injuries, and with only minor hail damage to the intact aircraft. Following an on-site engine replacement, the jetliner took off from Saturn Boulevard, a road which had previously been an aircraft runway at Michoud. The aircraft was subsequently repaired and returned to service until it finally retired in 2016.

<span class="mw-page-title-main">Space Shuttle orbiter</span> Reusable spacecraft component of the Space Shuttle system

The Space Shuttle orbiter is the spaceplane component of the Space Shuttle, a partially reusable orbital spacecraft system that was part of the discontinued Space Shuttle program. Operated from 1977 to 2011 by NASA, the U.S. space agency, this vehicle could carry astronauts and payloads into low Earth orbit, perform in-space operations, then re-enter the atmosphere and land as a glider, returning its crew and any on-board payload to the Earth.

<span class="mw-page-title-main">Approach and Landing Tests</span> Trials of the prototype Space Shuttle Enterprise

The Approach and Landing Tests were a series of sixteen 1977 taxi and flight trials of the prototype Space Shuttle Enterprise to test the vehicle's flight characteristics, eleven while mated to the Shuttle Carrier Aircraft and five in crewed free flight.

<span class="mw-page-title-main">Pacific Western Airlines Flight 314</span> Aviation accident on 11 February 1978

On 11 February 1978, Pacific Western Airlines Flight 314, a Boeing 737-200, crashed at Cranbrook/Canadian Rockies International Airport, near Cranbrook, British Columbia, Canada, killing 43 of the 49 people on board.

<span class="mw-page-title-main">Flight simulation video game</span> Video game genre

A flight simulation video game refers to the simulation of various aspects of flight or the flight environment for purposes other than flight training or aircraft development. A significant community of simulation enthusiasts is supported by several commercial software packages, as well as commercial and homebuilt hardware. Open-source software that is used by the aerospace industry like FlightGear, whose flight dynamics engine (JSBSim) is used in a 2015 NASA benchmark to judge new simulation code to space industry standards, is also available for private use. A popular type of flight simulators video games are combat flight simulators, which simulate combat air operations from the pilot and crew's point of view. Combat flight simulation titles are more numerous than civilian flight simulators due to variety of subject matter available and market demand.

<span class="mw-page-title-main">Drop test</span> Method of testing aircraft/spacecraft

A drop test is a method of testing the in-flight characteristics of prototype or experimental aircraft and spacecraft by raising the test vehicle to a specific altitude and then releasing it. Test flights involving powered aircraft, particularly rocket-powered aircraft, may be referred to as drop launches due to the launch of the aircraft's rockets after release from its carrier aircraft.

References

  1. Young, John W.; Hansen, James R. (2012). "IV: The Shuttle Era". Forever Young: A Life of Adventure in Air and Space. Kindle eBook. University Press of Florida. ISBN   978-0-8130-4281-7. OCLC   1039310141. I went to Boeing in Seattle to see if its 737 airliner could be used to simulate the orbiter, particularly on its final high-altitude overhead approach to landing. We found that it could be done in the 737 simulator if the pilot could use reverse thrust and all the machine's drag devices at a speed of 300 knots. The real drawback was the expense of the Boeing 737, which we could not afford.
  2. 1 2 NASA - Test Drive: Shuttle Training Aircraft Preps Astronauts for Landing
  3. "NASA ties bolt to training scare", Florida Today newspaper (article reprinted on the International Aviation Safety Association website), Feb 7, 2004
  4. "NASA Jet Sheds Parts Over Florida", AVweb website, February 9, 2004
  5. IIS Corp. Shuttle Training Aircraft Archived 2008-04-12 at the Wayback Machine
  6. "Shuttle Training Aircraft to be Retired at NASA Dryden". NASA . 5 June 2013. Archived from the original on 2022-10-07.
  7. NASA Space Shuttle Trainer Retires In Amarillo
  8. NASA aircraft flown by Rick Husband calls Amarillo 'home'