Shuttle Columbia STS-107 Message Board

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Pastimes : Shuttle Columbia STS-107

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To: scotty who wrote (289)	2/4/2003 2:44:26 PM
From: DWB	Read Replies (1) of 627

For the last freaking time.... "Question: I know during Project Apollo there was a four-minute blackout period in communications during re-entry of the Command Module. Does the shuttle have the same issue? Answer: The blackout period is caused by a sheath of ionized air, formed during the high-heating, high-deceleration phase of re-entry, through which radio waves cannot penetrate. The shuttle experienced the same effect during its early flights. However, after placing the second Tracking Data and Relay Satellite (TDRS) in orbit, the loss of data due to ionization no longer occurred. The reason is that the ionization sheath is open at the trailing end, providing a hole through which communication with the shuttle can be maintained with the favorably positioned TDRS. This second TDRS also allows communication during the other portions of entry that did not exist prior to its placement in 1988 (roughly from the time of the de-orbit OMS burn to an altitude of 200,000 feet for a landing at Edwards Air Force Base, barring passes over ground sites)." DWB

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