SB SPACE @ ARL $ARLS026 ARLS026 September Phase 3D Launch Doubtful ZCZC AS26 QST de W1AW Space Bulletin 026 ARLS026 From ARRL Headquarters Newington, CT July 30, 1997 To all radio amateurs SB SPACE ARL ARLS026 ARLS026 September Phase 3D Launch Doubtful The September 30 launch of the Phase 3D Amateur Radio satellite was put in grave doubt this week. It appears extremely unlikely that Phase 3D will be able to meet revised mechanical specifications in time to fly on schedule aboard the Ariane 502 rocket. AMSAT officials are holding out a glimmer of hope that the Ariane 502's schedule will slip just enough to let Phase 3D catch up again, but those chances are considered very slim. In a statement, AMSAT called the turn of events ''very bad news.'' AMSAT-NA President Bill Tynan, W3XO, confirmed that, in order to include Phase 3D, the Ariane 502's overall launch schedule would have to slip a month or two. But, he said, ''if it goes on schedule, we won't go on '502.'' The latest setback for the next-generation Amateur Radio satellite came when the European Space Agency (ESA) significantly increased its estimate of vibration levels the Phase 3D payload would be exposed to aboard the Ariane 502. The revised estimates mean AMSAT will have to move fast to make structural changes in the Phase 3D spaceframe in order to withstand the anticipated rougher ride. Phase 3D Project Leader Karl Meinzer, DJ4ZC, told ESA in mid-July that the work required by the agency's new information would prevent AMSAT from delivering the spacecraft to Kourou, French Guiana, by the specified August 10 date. AMSAT brought in an independent structural engineer to review the spacecraft's design and construction. Since his report, AMSAT said that ''substantial effort has been taking place at the Phase 3D Integration Lab in Orlando, Florida'' to make and install the recommended structural reinforcements. That work continues. If the Phase 3D payload is not going to be available on time, AMSAT must supply a ''mass simulator'' representing the Phase 3D spacecraft by September 5. Tynan was philosophical about the latest complication for the Phase 3D program. ''This is the way engineering works sometimes. It's trade-offs and give-and-take with other people.'' He said it was too early to speculate on future launch possibilities. NNNN /EX