Check fuel level in as many ways as possible before taking off.
If there's any doubt about fuel on board, add fuel until you can
check the level visually.
Also called a transponder code, a four digit number broadcast by
the transponder in an aircraft to assist air traffic controllers in
traffic separation.
"That's one small step for 'a' man, one giant leap
for mankind."
Source: Neil Armstrong, upon first stepping on
the Moon July 20, 1969. An Australian computer expert has analyzed
the voice audio and concluded that Armstrong actually did say "a
man".
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