For those of you that are Boeing virgins...
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The nš 1 tank, in all previous Boeing airplanes, has been the tank where the fuel temperature probe was located... in the 707, the 720, the 727, your 737, and in 747... I would expect it to be in nš 1 tank as well,, in the 757, the 767, the 777 and the 787... Shall we inquire about the 797... ?
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Those of you "superior" 737 NG pilots (NG, is it "no good" ?) ... even your sliding cockpit windows are the same as... 707, 720 and 727. I would even guess that your "ESSential PWR" items list is the same as... my 727 that are now retired in the deserts...
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When you go from one type of Boeing, to another type of Boeing, you notice that many things remain "same"... I went from the 727 to the 707 in my early days, and if I had to study hard initially, for the 727, I found to be quite easy when I went to the 707... it was a "repeat" of acquired knowledge... Even for the 747, the airplane is just a big 707 with the 727 accessories...
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So when you ask yourselves "why" in the 737, just ask yourselves "how" the other Boeings were.
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And I had a few years on DC-8s... could not sleep in the classroom.
All was different from Boeings...!
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Happy contrails