DA-Decision Altitude. It is the lowest an aircraft can fly on an (precision) instrument approach. At that height the pilot must be able to see the runway or landing light system or else he has to initiate a missed approach
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DOW (Dry Operating Weight) in aviation refers to the weight of an aircraft when it is empty and without any fuel or payload. It includes the weight of the structure, systems, equipment, and furnishings of the aircraft. DOW is used to calculate the aircraft's performance, fuel calculations, and maximum payload capacity.
a = 2πr2 + 2πrh ∴da/dr = 4πr + 2π(h + r dh/dr)
A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
3 to 100 people has to march and put their leg out like this: "Da da da da da CHA!"
Yes, in computer slang 'da' stands for 'the'. For example, 'I went to da shop' would mean the same as 'I went to the shop'.