The Long March 3B (Chinese: 长征三号乙火箭, Chang Zheng 3B), also known as the CZ-3B and LM-3B, is a Chinese orbital carrier rocket. Introduced in 1996, it is launched from Launch Area 2 and 3 at the Xichang Satellite Launch Center in Sichuan. A three-stage rocket with four strap-on liquid rocket boosters, it is currently the most powerful member of the Long March rocket family and the heaviest of the Long March 3 rocket family, and is mainly used to place communications satellites into geosynchronous orbits.
An enhanced version, the Long March 3B/E or G2, was introduced in 2007 to increase the rocket's GTO cargo capacity and lift heavier GEO communications satellites. The Long March 3B also served as the basis for the medium-capacity Long March 3C, which was first launched in 2008.
As of June 2017[update], the Long March 3B and 3B/E have conducted 37 successful launches, plus one failure and two partial failures, giving them a success rate of 92.5%.
The development of the Long March 3B began in 1986 to meet the needs of the international GEO communications satellite market. During its maiden flight on 14 February 1996 carrying the Intelsat 708 satellite, the rocket suffered a guidance failure two seconds into the flight and destroyed a nearby town, killing at least six people, but outside estimates suggest that anywhere between 200 and 500 people might have been killed. However, the author of  later ruled out large casualties, because evidence suggest that the crash site is evacuated before launching.
The Long March 3B and 3B/E rockets conducted ten successful launches between 1997 and 2008.
In 1997, the Agila 2 satellite was forced to use onboard propellant to reach its correct orbit because of poor injection accuracy on the part of its Long March 3B launch vehicle. In 2009, a Long March 3B partially failed during launch due to a third stage anomaly, which resulted in the Palapa-D satellite reaching a lower orbit than planned. Nonetheless, the satellite was able to maneuver itself into the planned orbit. The Long March 3B and its variants remain in active use as of January 2014[update], having conducted a total of 23 consecutive successful launches.
In December 2013, a Long March 3B/E successfully lifted Chang'e 3, China's first Lunar lander and rover into the projected lunar-transfer orbit.
The Long March 3B is based on the Long March 3A as its core stage, with four liquid boosters strapped on the first stage. It has an LEO cargo capacity of 12,000 kilograms (26,000 lb) and a GTO capacity is 5,100 kilograms (11,200 lb).
The Long March 3B/E, also known as 3B/G2, is an enhanced variant of the Long March 3B, featuring an enlarged first stage and boosters, increasing its GTO payload capacity to 5,500 kilograms (12,100 lb). Its maiden flight took place on 13 May 2007, when it successfully launched Nigeria's NigComSat-1, the first African geosynchronous communications satellite. In 2013, it successfully launched China's first lunar lander Chang'e 3 and lunar rover Yutu.
A modified version of the Long March 3B, the Long March 3C, was developed in the mid-1990s to bridge the gap in payload capacity between the Long March 3B and 3A. It is almost identical to the Long March 3B, but has two boosters instead of four, giving it a reduced GTO payload capacity of 3,800 kilograms (8,400 lb). Its maiden launch took place on 25 April 2008.
|Flight number||Date (UTC)||Launch site||Version||Payload||Orbit||Result|
|1||February 14, 1996
|LA-2, XSLC||3B||Intelsat 708||GTO||Failure|
|2||August 19, 1997
|3||October 16, 1997
|LA-2, XSLC||3B||APStar 2R||GTO||Success|
|4||May 30, 1998
|LA-2, XSLC||3B||Chinastar 1||GTO||Success|
|5||July 18, 1998
|LA-2, XSLC||3B||SinoSat 1||GTO||Success|
|6||April 12, 2005
|LA-2, XSLC||3B||APStar 6||GTO||Success|
|7||October 28, 2006
|LA-2, XSLC||3B||SinoSat 2||GTO||Success|
|8||May 13, 2007
|9||July 5, 2007
|LA-2, XSLC||3B||ChinaSat 6B||GTO||Success|
|10||June 9, 2008
|LA-2, XSLC||3B||ChinaSat 9||GTO||Success|
|11||October 29, 2008
|12||August 31, 2009
|LA-2, XSLC||3B||Palapa-D||GTO||Partial Failure|
|13||September 4, 2010
|LA-2, XSLC||3B/E||SinoSat 6||GTO||Success|
|14||June 20, 2011
|LA-2, XSLC||3B/E||ChinaSat 10||GTO||Success|
|15||August 11, 2011
|16||September 18, 2011
|LA-2, XSLC||3B/E||ChinaSat 1A||GTO||Success|
|17||October 7, 2011
|LA-2, XSLC||3B/E||Eutelsat W3C||GTO||Success|
|18||December 19, 2011
|19||March 31, 2012
|LA-2, XSLC||3B/E||APStar 7||GTO||Success|
|20||April 29, 2012
|21||May 26, 2012
|LA-2, XSLC||3B/E||ChinaSat 2A||GTO||Success|
|22||September 18, 2012
|23||November 27, 2012
|LA-2, XSLC||3B/E||ChinaSat 12||GTO||Success|
|24||May 1, 2013
|LA-2, XSLC||3B/E||ChinaSat 11||GTO||Success|
|25||December 1, 2013
|LA-2, XSLC||3B/E||Chang'e 3||LTO||Success|
|26||December 20, 2013
|LA-2, XSLC||3B/E||Túpac Katari 1||GTO||Success|
|27||July 25, 2015
|LA-2, XSLC||3B/E + YZ-1||BDS M1-S
|28||September 12, 2015
|29||September 29, 2015
|LA-3, XSLC||3B/E||BDS I2-S||GTO||Success|
|30||October 16, 2015
|LA-2, XSLC||3B/E||APStar 9||GTO||Success|
|31||November 3, 2015
|LA-3, XSLC||3B/E||ChinaSat 2C||GTO||Success|
|32||November 20, 2015
|33||December 9, 2015
|LA-3, XSLC||3B/E||ChinaSat 1C||GTO||Success|
|34||December 28, 2015
|LA-2, XSLC||3B/E||Gaofen 4||GTO||Success|
|35||January 15, 2016
|36||August 5, 2016
|37||December 10, 2016
|38||January 5, 2017
|39||April 12, 2017
|LA-2, XSLC||3B/E||Shijian 13||GTO||Success|
|40||June 19, 2017
|LA-2, XSLC||3B/E||Chinasat 9A||GTO||Partial Failure|
On February 14, 1996, the launch of the first Long March 3B with Intelsat 708 failed just after liftoff when the launch vehicle veered off course and exploded when it hit the ground at T+23 seconds. At least 6 people on the ground were killed by the explosion. The cause of the accident was traced to short-circuiting of the vehicle's guidance platform at liftoff.
On August 31, 2009, during the launch of Palapa-D, the third stage engine under-performed and placed the satellite into a lower than planned orbit. The satellite was able to make up the performance shortfall using its own engine and reach geosynchronous orbit, but with its lifetime shortened to 10.5 years. Investigation found that the engine's gas generator suffered a burn-through due to ice blockage in the engine's liquid-hydrogen injectors.
On June 19th, 2017,a Long March 3B/E mission carrying ChinaSat-9A ended in partial failure. Officials refused to release details regarding the status of the mission until about 13 hours after liftoff. Officials then confirmed that the mission had been anomalous and that an anomaly had been detected in the performance of the vehicle's upper stage due to which the intended orbit had not been attained, while analyzing the vehicle's telemetry. Investigation found a failure in third stages Rolling Control Thruster during the glide phase left payload in a lower than intended orbit, the payload spent two weeks reaching its intended orbit under its own power.