I took this picture of of Orbis's McDonnell Douglas MD-10-30. Tail: N330AU.
What purpose do the 0 and 2 degree markers serve?
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6$\begingroup$ Does this answer your question? Why is the angle of the horizontal stabilizer marked on the fuselage? Not the most thorough answers, but since it's the same question, new answers should go there. $\endgroup$– user14897Jul 31, 2021 at 11:24
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$\begingroup$ It is there so the pilots can check the stab trim via the wingtip mirrors. $\endgroup$– Jpe61Aug 1, 2021 at 11:11
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1 Answer
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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.
answered Jul 31, 2021 at 6:26
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2$\begingroup$ 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? $\endgroup$– user14897Jul 31, 2021 at 11:26
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$\begingroup$ 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, 2021 at 2:32