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To: Maurice Winn who wrote (282)1/20/1998 5:33:00 AM
From: brian h  Respond to of 29986
 
Maurice and all,

BOEING NOTES OSCILLATION DURING SKYNET LAUNCH
posted on 1/19/98 at 16:44 UTC by Keith Stein

During a post-launch review of data recorded during Boeing's launch of Skynet-4D, a military communications satellite for the U.K., engineers noticed a "slight abnormal oscillation" during the second stage engine burn, according to Boeing Communications.

During the engine burn, performed before deployment, data showed an abnormal "shock transient" causing a "temporary oscillation" in the second stage.

Skynet was deployed with no problems, and is currently in its planned orbit with no impact to its mission.

A second, and more dramatic "oscillation" event, occurred after payload deployment when the second stage performed its depletion burn to empty its fuel tanks.

This caused the stage to start tumbling at a very fast abnormal rate.

Skynet-4D, built by Matra Marconi, was launched January 9th from the Cape Canaveral Air Station, Florida.

Currently there is no impact to the Delta launch schedule with five Iridiums at the end of this month, and four Globalstar payloads the first week of February, according to Christine Nelson, Boeing Communications.

Dream! Dream! Dream!

Brian H.