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Finally saw the difference after swapping to lithium grease on flap jackscrews

I was having issues with those flap jackscrews binding up after about 50 hours on a 737. Old timer at the shop said try lithium grease instead of the general purpose stuff. After 3 months of using it, the wear marks are way lighter and the screws move smoother. Anyone else stick with one type of grease for certain parts?

2 comments

2 Comments

pat_hall871mo ago

Same here, that old timer probably forgot more than I'll ever know about grease." I was fighting with those jackscrews on an older 737 a while back, they'd start sticking and squeaking after a few trips. Swapped over to lithium grease and it was like night and day, they didn't gum up nearly as fast. The wear on the threads after a couple hundred hours was maybe half of what I was used to seeing. I still keep a tube of the cheap stuff for less fussy parts but that lithium is the only thing I trust for those flap screws now.

james6611mo ago

Lithium's the way to go for sure. Makes all the difference.