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737 Stab Trim Setting Indicator  
User currently offlinesmartt1982 From United Kingdom, joined Nov 2007, 225 posts, RR: 0
Posted (1 year 9 months 3 weeks 3 days 4 hours ago) and read 2824 times:

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
 
User currently offlineyeelep From United States of America, joined Apr 2011, 649 posts, RR: 0
Reply 1, posted (1 year 9 months 3 weeks 3 days 3 hours ago) and read 2808 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]

User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (1 year 9 months 3 weeks 2 days 22 hours ago) and read 2759 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.


User currently offlinemandala499 From Indonesia, joined Aug 2001, 6769 posts, RR: 76
Reply 3, posted (1 year 9 months 3 weeks 2 days 17 hours ago) and read 2732 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 !
User currently offlineyeelep From United States of America, joined Apr 2011, 649 posts, RR: 0
Reply 4, posted (1 year 9 months 3 weeks 2 days 8 hours ago) and read 2689 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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