In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. COUNT 5
QSN1 When was the fourth satellite for the BeiDou-1 system launched? ANS1 February 2007 QSN2 What is the name of the fourth BeiDou-1 satellite? ANS2 BeiDou-1D QSN3 What is the BeiDou-1D satellite sometimes called? ANS3 BeiDou-2A QSN4 What is the purpose of the BeiDou-1D satellite? ANS4 serving as a backup satellite QSN5 What happened to the BeiDou-1D satellite that needed to be repaired? ANS5 a control system malfunction