[FPSPACE] China reveals deadly threat to first flight

[Sven Grahn]

As someone has already pointed out - to rely on ground commands for a 
safe landing sounds like a strange idea. Reporters must have 
misunderstood and/or embellished a tracking/communications problem....

Sven

----Ursprungligt meddelande----
Från: ljk4 at msn.com
Datum: Aug 15, 2007 3:43:59 PM
Till: fpspace at friends-partners.org
Ärende: [FPSPACE] China reveals deadly threat to first flight

China reveals deadly threat to first flight

Yang in orbit October 2003.

by Staff Writers

Beijing (AFP) Aug 13, 2007

China's historic first manned space mission narrowly averted disaster 
when 
ground control lost contact with the returning space capsule, China 
revealed 
for the first time Monday, four years later.
The communication blackout as the capsule re-entered the Earth's 
atmosphere 
threatened a safe landing by astronaut Yang Liwei and forced ground 
control 
to use backup systems, Xinhua news agency reported.

"Yang lost every means to contact with the ground command and control 
headquarters as soon as he entered (the atmosphere), which fell in the 
worst 
case scenario prepared by the space mission team," Xinhua quoted Dong 
Deyi, 
head of China's control centre, as saying.

Yang's short mission aboard the Shenzhou V in October 2003 was hailed 
as a 
huge success for China's fledgling space programme, making the country 
the 
third to place a man in space after the former Soviet Union and the 
United 
States.

Some communication obstructions are normal during re-entry but Dong 
said 
none of China's radar could pick up a signal from the capsule.

Even after communications were re-established, signals remained weak 
enough 
to leave Yang at risk of "lethal impact" upon landing, he said.

"The echo signals from the spaceship were still volatile, which 
sufficiently 
threatened the safe landing of astronaut Yang," Dong was quoted as 
saying.

China's space command in the northern city of Xi'an ordered 
implementation 
of an optical guiding and tracking system instead of communications-
guided 
landing control, he said.

This allowed headquarters to "properly control the slow-down 
parachute, 
which was vital to a soft landing," Dong said.

Two years after Yang's mission, the Shenzhou VI carried two astronauts 
into 
space on a five-day mission.

China has since announced plans for its first lunar probe this year 
and has 
targeted putting a man on the moon within 15 years.

http://www.spacedaily.com/reports/070813074340.8oicmtly.html


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Sven Grahn
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