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I took this picture of of Orbis's McDonnell Douglas MD-10-30. Tail: N330AU.

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What purpose do the 0 and 2 degree markers serve?

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This tells the maintenance mechanics what trim state the elevator is in without having to run the pitch trim motor back and forth from the cockpit.

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    $\begingroup$ I think you meant stabilizer not elevator. Also I don't follow the logic: let's assume there are no markings, how does running the motor/actuator back and forth help? $\endgroup$
    – ymb1
    Jul 31 at 11:26
  • $\begingroup$ OK, call it the stabilizer. mechanic doesn't know the status of pitch trim. climbs into the cockpit, runs the pitch trim to the nose up limit, goes back, measures the pitch angle, runs back to cockpit, runs the pitch trim to its nose down limit, goes back and measures the pitch angle. Or (s)he looks at the index mark on the fuselage. $\endgroup$ Aug 1 at 2:32

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