Boeing 720-051B Engine Testbed, c/n 18384


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Allied Signal modified a 720-051B to test the TFE731-40 turbofan engine. It was the oldest Boeing jet airliner that still flew when it was retired in December 2007.

Allied Signal's TFE731-40 Testbed wore construction number 18384. It first flew on September 15, 1961. TWA leased it as N794TW beginning on August 27, 1961. Northwest leased it as N733US on October 26, 1962 and then bought it on July 1, 1968. Maersk Air registered it as OY-APZ in January 1973 and leased it to Nigeria Airways in December 1974. TEA leased it as OO-TYA on November 6, 1979 and returned it to Maersk on January 19, 1980. Conair acquired it on February 16, 1981.

Allied Signal registered it as N720GT on November 24, 1987 and mounted an engine test pylon on the right side of the forward fuselage.

720-051B Allied Signal TFE731-40 Engine Testbed, N720GT 720-051B Allied Signal TFE731-40 Engine Testbed, N720GT at the Williams-Gateway Airport, Arizona on March 31, 1996.

720-051B Allied Signal TFE731-40 Engine Testbed, N720GT At the Williams-Gateway Airport, Arizona on March 31, 1996.

720-051B Allied Signal TFE731-40 Engine Testbed, N720GT At the Williams-Gateway Airport, Arizona on March 31, 1996.

720-051B Allied Signal TFE731-40 Engine Testbed, N720GT At the Williams-Gateway Airport, Arizona on March 31, 1996.

720-051B Allied Signal TFE731-40 Engine Testbed, N720GT At the Williams-Gateway Airport, Arizona on March 31, 1996.

At the Williams-Gateway Airport, Arizona on March 31, 1996.

The 720-051B Engine Testbed was registered as N720H in February 2000. Honeywell International acquired it and installed a Honeywell AS977 engine. Honeywell conducts frequent engine test flights with it.

Honeywell's Boeing 720-051B, N720H at Phoenix Sky Harbor International Airport on April 11, 2006.

Honeywell's Boeing 720-051B, N720H engine testbed was the last airworthy 720 in the United States. Camelback Mountain looms in the distance.

Honeywell's Boeing 720-051B, N720H engine testbed at Phoenix Sky Harbor International Airport on April 11, 2006.

The mobile work shelter has been rolled back from Honeywell's Boeing 720-051B, N720H engine testbed revealing that there is no engine on the test pylon.

Stereo pair of Honeywell's Boeing 720-051B, N720H engine testbed. Cross your eyes until the images line up to see the 720 in 3-D.

Honeywell's Boeing 720-051B, N720H engine testbed at Phoenix Sky Harbor International Airport on April 11, 2006.

Honeywell's Boeing 720-051B, N720H engine testbed at Phoenix Sky Harbor International Airport on April 12, 2006.

Honeywell's Boeing 720-051B, N720H engine testbed at Phoenix Sky Harbor International Airport on April 12, 2006. Camelback Mountain looms in the background.

Honeywell Boeing 720 Engine Testbed, Phoenix, December 27, 2007 Honeywell's Boeing 720-051B engine testbed made a six hour long flight from Phoenix Sky Harbor Airport on Thursday December 27, 2007. It filed a flight plan from Williams-Gateway to Phoenix. It actually departed from Phoenix and activated its flightplan over Williams-Gateway. Four Peaks is visible in the distance.

See the track of this flight (downloaded from Flightwise.com) in Google Earth.

Honeywell's Boeing 720-051B N720H engine testbed The Papago Buttes form a backdrop to Honeywell's Boeing 720-051B N720H.

Photography Prints You can buy framed prints or greeting cards of this photo.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H scrubs smoke off its main landing gear as it lands on Runway 26.

Honeywell's Boeing 720-051B N720H engine testbed Another small puff of smoke was produced as Honeywell's Boeing 720-051B N720H nose gear touched down.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H deploys its spoilers to reduce lift after touchdown.

Honeywell's Boeing 720-051B N720H engine testbed Honeywell's Boeing 720-051B N720H taxis back to its parking spot on the north side of the airport.

N720H made one more flight two days later and was broken up at Sky harobor in 2008. It has been replaced with Boeing 757-225 N757HW.




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A dozen photos of Boeing Jetliner Prototypes and Testbeds. Aircraft pictured include:

367-80 Stratoliner Prototype, N70700, MASDC, November 12, 1973
EC-137D Airborne Warning and Control System Prototype, 71-1408, Boeing Field, Seattle, June 18, 1973
727-63 General Electric Unducted Fan Testbed, N32720, Mojave Airport, November 9, 1986
747-121 General Electric Engine Testbed, N747GE, Kramer Junction, California, August 24, 1999
#1 737-900 Prototype, N737X, Edwards Air Force Base, November 2, 2000
NT-43A Radar Test Bed, 73-1155, Death Valley, January 24, 2003
#1 757-200 F-22 Avionics Testbed, N757A, Air Force Plant 42, Palmdale, California, February 13, 2006
747-273C Evergreen International Supertanker, N470EV, San Bernardino, May 31, 2006
720-051B Honeywell engine testbed N720H, Phoenix Sky Harbor International Airport, December 27, 2007
757-225 Honeywell engine testbed N757HW, Phoenix Sky Harbor International Airport, February 1, 2010
#6 787-8 Prototype N787ZA, Mesa Gateway Airport, Arizona, November 11, 2011
#3 747-8 prototype N50217, Mesa Gateway Airport, Arizona, June 21, 2010

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