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example of station number

In the figure we can see the station line even though it is not clear. I'am using that picture just for an example to make the question clearer.

Main question

  • What is the station number for wingtip on a Boeing 747? (fuselage station and water lines)(If possible the butt lines too)

I tried searching the internet for the station number and couldn't find what I'm looking for. Or am I looking at the wrong place to find it? Where to find the number if you don't have access to the aircraft maintenance manual?

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For the wing tip station , just divide the wingspan by two and multiply by 12. The stations are in inches. For a 747 with a 195' 8" wing span, the tip station is 195.66 divided by 2, times 12 = 1173.96, so the tip will be Station 1174.

For X and Z you need to know where the datum point is longitudinally and for the X axis, and what the waterline is that defines the Z axis. Waterline is often the cabin floor. X datum on a jet is often the forward pressure bulkhead surface.

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  • $\begingroup$ can you give an example position for the water lines and butt lines $\endgroup$ – cat Apr 18 '18 at 23:24
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    $\begingroup$ Look up the SE post What Is The Coordinate System Used On Aircraft, from about 3 years ago. $\endgroup$ – John K Apr 20 '18 at 1:28
  • $\begingroup$ Strictly speaking, wouldn't Station 1174 be one twenty-fifth of an inch beyond the wingtip? $\endgroup$ – Sean Mar 23 at 3:02
  • $\begingroup$ This is incorrect as wing station on a swept wing aircraft generally follows a line parallel to the sweep on the leading edge starting at BL0. $\endgroup$ – Carlo Felicione Mar 23 at 6:52
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I wish I had the chart of this from Boeing’s MDF on the 747, but a good estimate might be as follows.

A Boeing 747 has a wingspan of 195 ft 8 in and a LE sweep of 37.5°.

Therefore:

Span (in): 2348 in So wingtip lies on BL 1174.

The wing station uses a different coordinate system for swept wing aircraft which is parallel to the wing LE or similar datum. Using the wing LE as a datum, this gives:

1174/cos(37.5°) = 1479.79

So the wingtip would be at WS 1479.79

NOTE: this is a reasonable estimate and not to be taken

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