# Casc Long March 3b
*launch services*

## Specifications
- **merge suggestions**: [{"slug":"casc-long-march-3a","name":"Casc Long March 3a","score":0.9444444444444444,"matchedOn":"slug","matchedValue":"casc-long-march-3a"},{"slug":"casc-long-march-2d","name":"Casc Long March 2d","score":0.8888888888888888,"matchedOn":"slug","matchedValue":"casc-long-march-2d"},{"slug":"casc-long-march-4c","name":"Casc Long March 4c","score":0.8888888888888888,"matchedOn":"slug","matchedValue":"casc-long-march-4c"}]
- **entity type**: launch_service
- **last verified date**: 2026-06-16
- **verified by**: operator
- **claim status**: unclaimed
- **attributes**: {"merge_suggestions":"[{\"slug\":\"casc-long-march-3a\",\"name\":\"Casc Long March 3a\",\"score\":0.9444444444444444,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-3a\"},{\"slug\":\"casc-long-march-2d\",\"name\":\"Casc Long March 2d\",\"score\":0.8888888888888888,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-2d\"},{\"slug\":\"casc-long-march-4c\",\"name\":\"Casc Long March 4c\",\"score\":0.8888888888888888,\"matchedOn\":\"slug\",\"matchedValue\":\"casc-long-march-4c\"}]"}

## Editorial
Long March 3B is a boosted Long March 3A-derived heavy GTO launch vehicle.[^cgwic-lm3b] It adds four liquid boosters to the Long March 3A architecture; the Long March 3B/E enhanced version uses enlarged core-stage and booster structures.[^cgwic-lm3b] Published GTO capacity is 5,100 kg for Long March 3B and 5,500 kg for Long March 3B/E.[^cgwic-lm3b] The vehicle remained active as of 2026-06-16, with successful Long March-3B launches in 2025, but buyer evaluation should also account for the Shijian-32 Long March-3B launch failure on 2026-01-17.[^xinhua-lm3b-2025][^xinhua-lm3b-failure-2026]

## Sources
- [cgwic-lm3b] | LM-3B, CGWIC | https://www.cgwic.com/Launchservice/LM3B.html | tier=operator-datasheet | accessed=2026-06-16
- [xinhua-lm3b-2025] | China successfully launches new satellite, Xinhua | https://english.news.cn/20251026/92a736adb4e7463f9a465b893c438b02/c.html | tier=third-party | accessed=2026-06-16 | published=2025-10-26
- [xinhua-lm3b-failure-2026] | China's Shijian-32 satellite launch mission fails, Xinhua | https://english.news.cn/20260117/46b59c2f4859420cadfd2e1a40ec5c94/c.html | tier=third-party | accessed=2026-06-16 | published=2026-01-17
- [cgwic-launch-record] | Launch Record, CGWIC | https://www.cgwic.com/Launchservice/LaunchRecord.html | tier=operator-datasheet | accessed=2026-06-16

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Source: https://eo-atlas.org/launch_services/casc-long-march-3b
Maintainer: SpectraWorks B.V. (CC-BY 4.0)