Elon Emails

Second Falcon 1 attempt scrubbed: fuel tank sucked inward

From:
Elon Musk
Date:
December 19, 2005 (Statement issued December 19, 2005 (Spaceflight Now logged it at 2045 GMT); a follow-up on the cause came later that day.)
To:
SpaceX update mailing list

Partial text. Only these passages were published; [...] marks a gap.

Launch is scrubbed until early next year, as there is a structural issue with the 1st stage fuel tank that will require repair. I will provide further comment as soon as this has been carefully analyzed. Consistent with our policy, we must be 100% green for launch with no outstanding concerns whatsoever. It is not just a matter of repairing the damage, but also understanding at a fundamental level how to ensure it never happens again. We will also do another full review of all the vehicle systems, including propulsion, structures, avionics, software and ground support systems. Therefore, I expect that the earliest that launch would occur is late January. Third time's the charm. [...] Due to high winds, we placed the countdown on hold and began draining the fuel tank. As we drained fuel from the 1st stage tank, a faulty pressurization valve caused a vacuum condition in the tank. This caused a fuel tank barrel section to deform and suck slightly inward. It is important to note that the root cause is an electrical fault with a valve, not structural design. At this point, it appears that no other damage was sustained to the vehicle or the satellite. The rocket will be lowered down this afternoon and placed in its hangar for further inspection.

About this email

Musk calls off the second Falcon 1 launch attempt until early 2006 after the first stage fuel tank was damaged. A follow-up explains that a faulty pressurization valve created a vacuum while fuel was being drained during a wind hold, and the tank barrel deformed inward.

Notes

Two statements from the same day joined at [...]. The first is the statement Spaceflight Now printed as issued by Musk (wording identical in NASASpaceFlight's quotation, whose paragraph breaks are used). The second is the follow-up explanation as quoted by NASASpaceFlight; Spaceflight Now says it came from 'a company status report'. How the two were laid out on spacex.com was not verified. NBC and Space.com quote an earlier wording of the first line: 'Launch is scrubbed for the year. We noticed a structural issue with the first stage fuel tank that will require repair.' SpaceRef's copy ('Falcon 1 Launch Scrubbed') now returns HTTP 410. Text was retrieved through a page reader, so punctuation and paragraph breaks may differ slightly from the original page.

Where it came from

Published by Musk; attribution widely reported.

SpaceX, newsletter. Tags: spacex-update, falcon-1, kwajalein, launch-scrub, maiden-flight