On the 9th of April 1967, at 1:15 p.m (local time), the prototype Boeing 737-130, N73700, (internal number PA-099) took off from Boeing Field, Seattle, Washington, with test pilots Brien Singleton Wygle and Samuel Lewis (“Lew”) Wallick, Jr., in the cockpit. After a 2 hour, 30 minute flight, the new airliner landed at Paine Field, Everett, Washington.

When asked by a reporter what he thought about the new airplane, Boeing’s president, Bill Allen, replied, “I think they’ll be building this airplane when Bill Allen is in an old man’s home.”

He was right. In production since 1968, the Boeing 737 is the most popular airliner made and is still in production. As of 31 December 2016, the total number of 737s delivered was 9,335. Boeing has received orders for 3,606 of the new 737 MAX variant.

Boeing test pilots Brien Wygle and Lew Wallick with the prototype 737 airliner, N73700. (Photo by Boeing)

Boeing 737-130 N73700 was a twin engine, medium-range airliner, operated by a pilot and co-pilot. It was designed to carry up to 124 passengers. The airplane is 97 feet (28.57 meters) long with a wingspan of 87 feet (26.52 meters) and overall height of 37 feet (11.3 meters). It has an empty weight of 56,893 pounds (25,806.7 kilograms) and gross weight of 111,000 pounds (50,349.6 kilograms).

N73700 is powered by two Pratt & Whitney JT8D-7 turbofan engines rated at 14,000 pounds of thrust, each. The JT8D was a two-spool engine with a 2-stage fan section, 13-stage compressor (6 low- and 7 high-pressure stages), nine combustion chambers and a 4-stage turbine (1 high- and 3 low-pressure stages). The JT8D-7 was 42.5 inches (1.080 meters) in diameter, 123.5 inches (3.137 meters) long, and weighed 3,096 pounds (1,404 kilograms).

The airliner’s cruise speed is 575 miles per hour (925.17 kilometers per hour) and its range is 1,150 miles (1,850.35 kilometers).


NASA 515, the prototype Boeing 737 airliner, rolling out on Runway 31L, Boeing Field, 3:11 p.m. PDT, 21 September 2003. (Photo by Robert A. Bogash)

After the flight test and certification program was complete, Boeing handed N73700 over to NASA at Langley Field, where it became NASA 515 (N515NA) and was used for research in cockpit design, engine controls, high lift devices, etc. Because of it’s short and stubby appearance, NASA named it “Fat Albert”.

The prototype Boeing 737 ended its NASA career and was returned to Boeing, landing for the last time at Boeing Field’s Runway 31L, 3:11 p.m., PDT, 21 September 2003. Today, PA-099 is on display at the Museum of Flight, Seattle, Washington.

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Text Author: Bryan R. Swopes