Write For Us

Dramatic abort derails Delta 4 launch


© United Launch Alliance   120818-abort.jpg

By William Harwood, CBS News

An attempt to launch a classified National Reconnaissance Office spy satellite atop a heavy-lift Delta 4 rocket at Vandenberg Air Force Base northwest of Los Angeles was aborted at the T-minus 7.5-second mark Saturday evening when a problem was detected by computers orchestrating the terminal countdown.

Flares had already ignited at the base of the 23-story-tall rocket to burn away excess hydrogen gas, a routine safety precaution, when the abort was ordered. It came a half second before the first of the Delta 4 Heavy's three side-by-side Common Booster Core engines was scheduled to ignite and throttle up to full thrust, followed two seconds later by the center and left-side CBCs.

Instead, a flight controller called out "hold, hold, hold" as the countdown came to a halt. Flames from the hydrogen igniters rose from the base of the rocket as they continued to burn for a few moments, a somewhat scary sight given the 1.6-million-pound rocket was loaded with 465,000 gallons of liquid hydrogen and oxygen propellants.

But United Launch Alliance engineers quickly "safed" the vehicle and re-cycled the countdown to the T-minus 4-minute mark while they reviewed telemetry. A few minutes later, the flight was scrubbed for the day, and engineers begin off-loading the Delta's load of fuel.

ULA did not set a new launch date or provide any immediate details about what triggered the abort. As a result, it was not immediately known what sort of inspections or repairs might be needed before a second launch can be attempted.

This was set to be ULA's ninth launch of 2018 and the second in a row of the huge Delta 4 Heavy. The identity of the satellite payload, known as NROL-71, is classified, but independent analysts speculate it may be an advanced imaging reconnaissance spacecraft bound for an unusual near-polar orbit.


Note: If you think this story need more information or correction, feel free to comment below your opinion and reaction.
Like & Follow to Stay Updated ...


AI,3,Amazon,1,Apple,5,Emoji,1,Facebook,17,Games,35,Google,7,Instagram,6,Science,205,Security,4,Social Media,24,Tech,242,Technology,1396,Tesla,5,Twitter,4,
Technology - U.S. Daily News: Dramatic abort derails Delta 4 launch
Dramatic abort derails Delta 4 launch
Technology - U.S. Daily News
Loaded All Posts Not found any posts VIEW ALL Read More Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share. STEP 2: Click the link you shared to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy