Firefly: Software caused failure of upper stage in December
According to the rocket startup Firefly, a software issue prevented the engine on the upper stage of its Alpha rocket from firing its final burn, leaving a Lockheed Martin satellite in the wrong orbit.
In a Feb. 20 statement, Firefly said an error with the guidance, navigation and control (GNC) software for the upper stage of the Alpha on the company’s “Fly the Lightning” mission Dec. 22 kept the upper stage from firing as planned to circularize its orbit. That left the upper stage and its payload, a Lockheed Martin technology demonstration satellite, in an orbit with a low perigee.
The investigation, which included the company’s own mishap team as well as an independent review, found that the error in the GNC software algorithm “prevented the system from sending the necessary pulse commands to the Reaction Control System (RCS) thrusters ahead of the stage two engine relight.” Firefly didn’t elaborate on the issue, but the RCS thrusters likely would have been used to ensure the stage was in the proper orientation and to settle its tanks so propellant would flow from them into the engine.
From this description it appears the attitude thrusters (RCS) had not worked correctly, and this made it impossible for the main engine to fire, either because the computer sensed it was in the wrong orientation, or its fuel could not flow properly to the engine.
The company says it has made corrections, and still expects to launch four times this year.
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According to the rocket startup Firefly, a software issue prevented the engine on the upper stage of its Alpha rocket from firing its final burn, leaving a Lockheed Martin satellite in the wrong orbit.
In a Feb. 20 statement, Firefly said an error with the guidance, navigation and control (GNC) software for the upper stage of the Alpha on the company’s “Fly the Lightning” mission Dec. 22 kept the upper stage from firing as planned to circularize its orbit. That left the upper stage and its payload, a Lockheed Martin technology demonstration satellite, in an orbit with a low perigee.
The investigation, which included the company’s own mishap team as well as an independent review, found that the error in the GNC software algorithm “prevented the system from sending the necessary pulse commands to the Reaction Control System (RCS) thrusters ahead of the stage two engine relight.” Firefly didn’t elaborate on the issue, but the RCS thrusters likely would have been used to ensure the stage was in the proper orientation and to settle its tanks so propellant would flow from them into the engine.
From this description it appears the attitude thrusters (RCS) had not worked correctly, and this made it impossible for the main engine to fire, either because the computer sensed it was in the wrong orientation, or its fuel could not flow properly to the engine.
The company says it has made corrections, and still expects to launch four times this year.
The support of my readers through the years has given me the freedom and ability to analyze objectively the ongoing renaissance in space, as well as the cultural changes -- for good or ill -- that are happening across America. Four years ago, just before the 2020 election I wrote that Joe Biden's mental health was suspect. Only in this year has the propaganda mainstream media decided to recognize that basic fact.
Fourteen years ago I wrote that SLS and Orion were a bad ideas, a waste of money, would be years behind schedule, and better replaced by commercial private enterprise. Even today NASA and Congress refuse to recognize this reality.
In 2020 when the world panicked over COVID I wrote that the panic was unnecessary, that the virus was apparently simply a variation of the flu, that masks were not simply pointless but if worn incorrectly were a health threat, that the lockdowns were a disaster and did nothing to stop the spread of COVID. Only in the past year have some of our so-called experts in the health field have begun to recognize these facts.
Your help allows me to do this kind of intelligent analysis. I take no advertising or sponsors, so my reporting isn't influenced by donations by established space or drug companies. Instead, I rely entirely on donations and subscriptions from my readers, which gives me the freedom to write what I think, unencumbered by outside influences.
Please consider supporting my work here at Behind the Black.
You can support me either by giving a one-time contribution or a regular subscription. There are five ways of doing so:
1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.
2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
3. A Paypal Donation:
5. Donate by check, payable to Robert Zimmerman and mailed to
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c/o Robert Zimmerman
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Cortaro, AZ 85652
You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above. And if you buy the books through the ebookit links, I get a larger cut and I get it sooner.
I wonder why they don’t fix their software problem and fire the engines when they get to apogee on any of the orbits? There must be deeper problems.
Barry,
I don’t know why they could not do remote operations and do as you suggested without a software fix, but I’m sure that they would have if it were practical and didn’t endanger the rest of the mission.
The SpaceNews article describes that Lockheed Martin accelerated its test schedule and accomplished many of the mission’s objectives. The satellite reentered a couple of weeks ago, so it is too late to rescue that mission even if they already have the solution ready to go. Since Firefly says it is still correcting the problem, I don’t think they have the updated software ready yet.
I don’t know whether the satellite can operate with the upper stage still attached. If they had to separate for the satellite to operate properly, then it would have been unable to make corrective actions even if the software was ready before reentry. I’m pretty sure that they made the best of a bad situation. Lemonade, anyone?