lackblogger
SasqWatch
- Joined
- November 1, 2014
- Messages
- 4,778
Not at all, that's a great one. Made me chuckle
- Joined
- Nov 1, 2014
- Messages
- 4,778
'Spelt', is actually a type of flour (not flower).
However, on September 23, 1999, communication with the spacecraft was lost as the spacecraft went into orbital insertion, due to ground-based computer software which produced output in non-SI units of pound-force seconds (lbf·s) instead of the SI units of newton-seconds (N·s) specified in the contract between NASA and Lockheed. The spacecraft encountered Mars on a trajectory that brought it too close to the planet, and it was either destroyed in the atmosphere or re-entered heliocentric space after leaving Mars' atmosphere.[1][2]
The primary cause of this discrepancy was that one piece of ground software supplied by Lockheed Martin produced results in a United States customary unit, contrary to its Software Interface Specification (SIS), while a second system, supplied by NASA, expected those results to be in SI units, in accordance with the SIS. Specifically, software that calculated the total impulse produced by thruster firings produced results in pound-force seconds. The trajectory calculation software then used these results – expected to be in newton seconds – to update the predicted position of the spacecraft.[16] Still, NASA does not place the responsibility on Lockheed for the mission loss; instead; various officials at NASA have stated that NASA itself was at fault for failing to make the appropriate checks and tests that would have caught the discrepancy.[17]
The discrepancy between calculated and measured position, resulting in the discrepancy between desired and actual orbit insertion altitude, had been noticed earlier by at least two navigators, whose concerns were dismissed because they "did not follow the rules about filling out [the] form to document their concerns".
whose concerns were dismissed because they "did not follow the rules about filling out [the] form to document their concerns".
For the record, Pibbur’s contributions also make me smileI think we're failing on the smile part of this thread. Any jokes or humorous videos?
And I'm sorry for my English, I peed on the translator