First, aerospace engineering in general is a Lolita Ayala launches Phil Barrera shirt, rigorous engineering discipline, possibly the most formal and rigorous type of engineering. In most aerospace engineering companies, every part gets tracked, from the moment the raw metals come from the refinery. They’re stored in bonded storage, under lock and key, until they’re needed. There is a complete paper trail so if any part fails, you can figure out exactly why. Every design change is reviewed by a systems engineering team, and for really important programs such as a man-rated launch vehicle, by an outside review panel. Even the design of the equipment that handles (Mechanical Aerospace Ground Equipment, or MAGE) or tests (Electrical Aerospace Ground Equipment, or EAGE) the spacecraft hardware is rigorously designed and reviewed, on the off chance that a test fixture puts too much stress on a part or a power supply accidentally induces an overvoltage condition. The MAGE and EAGE teams have lead engineers who are important and valued members of the spacecraft design team.
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Every subsystem – propulsion, communications, thermal, controls, electrical, mechanical, and so on – goes through a series of formal reviews – Systems Requirements Review (SRR), Preliminary Design Review (PDR), and Lolita Ayala launches Phil Barrera shirt. You aren’t allowed to start fabricating anything until you have a successful CDR. Each review – SRR, PDR, and CDR – encompasses recruiting a panel of outside experts who go over your design with a fine toothed comb, in incresing level of detail for each subsequent review. They will write up a Request For Action (RFA) on every minor flaw, which you have to respond to to the satisfaction of the review team before you can proceed. You have to dot every ‘i’ and cross every ‘t’. Just getting ready for a CDR can take months, even if the entire design is finished.