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737 Stab Trim Setting Indicator

smartt1982 From United Kingdom, joined Nov 2007, 212 posts, RR: 0
Posted (7 months 1 week 5 days 2 hours ago) and read 1788 times:

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On the stab trim indicator on the 737. Is there one side which is going to be more accurate than the other. Should there be a difference between them and if so, how much of a difference? On our procedures we set the stab trim according to the captains side because it is he or she who will check it as part of their take off/departure brief to check it is set correctly. Other than that, I cannot think of a reason why we set it according to one side over another, I thought they should be the same both sides?

4 replies: All unread, jump to last

yeelep From United States of America, joined Apr 2011, 526 posts, RR: 0
Reply 1, posted (7 months 1 week 5 days 1 hour ago) and read 1771 times:

On the NG's (classic's are probably the same) when the indicators are checked against the physical location of the jackscrew/stab, each indicator must be +-0.5 unit from the target and within 0.5 unit from each other. Neither target is considered the master, so either one could be the most accurate.

[Edited 2012-10-09 13:16:34]

tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81
Reply 2, posted (7 months 1 week 4 days 20 hours ago) and read 1722 times:

Quoting smartt1982 (Thread starter):
I thought they should be the same both sides?

They're on a common shaft so the offset should be constant but, thanks to tolerance stackup in both the shaft and the indicators, you're never going to get perfect agreement between the two sides.

Tom.

mandala499 From Indonesia, joined Aug 2001, 6175 posts, RR: 74
Reply 3, posted (7 months 1 week 4 days 15 hours ago) and read 1695 times:

Do the cheat... select the Stab-Trim according to the FMC readout first... (forgot which page)... then cross check with whichever StabTrim indicator your SOP tells you to!

When losing situational awareness, pray Cumulus Granitus isn't nearby !

yeelep From United States of America, joined Apr 2011, 526 posts, RR: 0
Reply 4, posted (7 months 1 week 4 days 6 hours ago) and read 1652 times:

Quoting yeelep (Reply 1):
Neither target is considered the master, so either one could be the most accurate.

Whoops, target should have read indicator.

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