Airstart Aviation

[Joseph]

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another T-6 Texan II (turboprop aircraft) question. When reading the airstart prodedure in the engine failure during flight section of the manual, I found something that Id appreciate the clarification. It mentions, "The higher the altitude, and the slower the airspeed, the warmer the starting ITT peak temperature."

By airspeed, I believe it is referring to KIAS (all graphs and useful data for pilots is in KIAS, at least in this manual) so no arguments there. now, we know that the higher the altitude the less dense air gets to keep up with a relatively constant KIAS, then TAS has to increase.

If TAS increased at this higher altitude, (relative to the air the plane is passing faster) and the plane is making up for the less dense air, why would we expect a higher peak ITT compared to an airstart at a lower altitude? Shoudnt be about the same peak temp?

Also the higher you go the colder it gets at least for a good 20,000 ft MSL which is a major portion of the flight envelope for this aircraft. (max ceiling 31,000 ft MSL). I guess getting colder air has zero impact on ITT? I appreciate the discussion. TY all!

So, you are correct in that IAS is the parameter that is being referred to by term "airspeed". However, I think you are confusing things by bringing TAS into the discussion. Keep the same unit of measure - if IAS increases then there will be a higher volume of air, and more heat dissipation; lower IAS means less airflow and higher ITT.

The reason you might get higher ITT at the same IAS but a higher altitude isn't because of TAS, it is because the air is less dense. (yes, I understand that TAS and density are related...) Air has thermal mass, and the less dense it is the less mass there is available to absorb heat from the turbine.

It might seem odd as cold as it is up high, but when performing environmental qualification testing of electronic equipment we often had more difficulty with heat dissipation during the high altitude chamber tests, (despite the sub-freezing temperatures) simply because the air was so thin.

The modern age of powered flight began in 1903 when Orville Wright made the first sustained, powered flight on December 17 in a plane he and his brother Wilbur built. This twelve-second flight led to the development of the first practical airplane in 1905 and launched worldwide efforts to build better flying machines. As a result, the early 20th century witnessed myriad aviation developments as new planes and technologies entered service. During World War I, the airplane also proved its effectiveness as a military tool and, with the advent of early airmail service, showed great promise for commercial applications.

Despite limited post-World War I technical developments, early aviation remained a dangerous business. Flying conditions proved difficult since the only navigation devices available to most pilots were magnetic compasses. Pilots flew 200 to 500 feet above ground so they could navigate by roads and railways. Low visibility and night landings were made using bonfires on the field as lighting. Fatal accidents were routine.

The Air Mail Act of 1925 facilitated the creation of a profitable commercial airline industry, and airline companies such as Pan American Airways, Western Air Express, and Ford Air Transport Service began scheduled commercial passenger service. By the mid-1930s, the four major domestic airlines that dominated commercial travel for most of the 20th century began operations: United, American, Eastern, and Transcontinental and Western Air (TWA).

As air travel increased, some airport operators, hoping to improve safety, began providing an early form of air traffic control (ATC) based on visual signals. Early controllers stood on the field and waved flags to communicate with pilots. Archie League, the system's first flagmen, began work in the late 1920s at the airfield in St. Louis, Missouri.

Aviation industry leaders believed the airplane could not reach its full commercial potential without federal action to improve and maintain safety standards. At their urging, the Air Commerce Act was passed in 1926. This landmark legislation charged the Secretary of Commerce with fostering air commerce, issuing and enforcing air traffic rules, licensing pilots, certifying aircraft, establishing airways, and operating and maintaining aids to air navigation. A new Aeronautics Branch in the Department of Commerce assumed primary responsibility for aviation oversight, and William P. MacCracken, Jr., became its first director.

In 1934, the Department of Commerce renamed the Aeronautics Branch the Bureau of Air Commerce to reflect the growing importance of aviation to the nation. In one of its first acts, the Bureau encouraged a group of airlines to establish the first air traffic control centers (Newark, New Jersey; Cleveland, Ohio; and Chicago, Illinois) to provide en route air traffic control. In 1936, the Bureau took over these centers. Early en route controllers tracked the position of planes using maps and blackboards and little boat-shaped weights that came to be called "shrimp boats." They had no direct radio link with aircraft, but used telephones to stay in touch with airline dispatchers, airway radio operators, and airport traffic controllers. Although en route ATC became a federal responsibility, local government authorities continued to operate airport towers. While the Department of Commerce worked to improve aviation safety, a number of high profile accidents called the department's oversight responsibilities into question. A 1931 crash that killed all on board, including popular University of Notre Dame football coach Knute Rockne, elicited public calls for greater federal oversight of aviation safety. Four years later, a DC-2 crash killed U.S. Senator Bronson Cutting of New Mexico.

To ensure a federal focus on aviation safety, President Franklin Roosevelt signed the Civil Aeronautics Act in 1938. The legislation established the independent Civil Aeronautics Authority (CAA), with a three-member Air Safety Board that would conduct accident investigations and recommend ways of preventing accidents. The legislation also expanded the government's role in civil aviation by giving CAA power to regulate airline fares and determine the routes individual carriers served. In 1940, President Roosevelt split the CAA into two agencies, the Civil Aeronautics Administration, which went back to the Department of Commerce, and the Civil Aeronautics Board (CAB). The offshoot of the original CAA retained responsibility for ATC, airman and aircraft certification, safety enforcement, and airway development. CAB responsibilities included safety rulemaking, accident investigation, and economic regulation of the airlines.

On the eve of America's entry into World War II, for defense purposes, CAA extended its ATC system to include operation of airport towers. In the postwar era, ATC became a permanent federal responsibility at most airports. The postwar era also witnessed the advent of commercial jets. The British Overseas Aircraft Corporation introduced the first commercial jet service in 1952. The 36-seat Comet flew at 480 miles per hour. The top cruising speed of the DC-3 piston aircraft, in comparison, was about 180 miles per hour. By the mid-1950s, U.S. companies began designing and building their own jet airliners.

On June 30, 1956, a Trans World Airlines Super Constellation and a United Air Lines DC-7 collided over the Grand Canyon, Arizona, killing all 128 occupants of the two airplanes. The collision occurred while the aircraft were flying under visual flight rules in uncongested airspace. The accident dramatized the fact that, even though U.S. air traffic had more than doubled since the end of World War II, little had been done to mitigate the risk of midair collisions.

On May 21, 1958, Senator A. S. "Mike" Monroney (D-OK) introduced a bill to create an independent Federal Aviation Agency to provide for the safe and efficient use of national airspace. Two months later, on August 23, 1958, the President signed the Federal Aviation Act, which transferred the Civil Aeronautics Authority's functions to a new independent Federal Aviation Agency responsible for civil aviation safety. Although the Federal Aviation Agency technically came into existence with the passage of the act, it actually assumed its functions in stages. Under the provisions of the act, the Federal Aviation Agency would begin operations 60 days after the appointment of the first Federal Aviation Agency Administrator. On November 1, 1958, retired Air Force General Elwood "Pete" Quesada became the first Federal Aviation Agency Administrator. Sixty days later, on December 31, the Federal Aviation Agency began operations.

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