Originally Posted by
Good memories
Question if I may. Does the manual trim wheel adjust the HS by means of cables?
Yes, the manual trim wheels use cables to adjust the HS. This is why either wheel can be held by a crew member to stop any undesired trimming.
The trim wheels have a retractable handle to make life easier when using the wheels to trim. Anyone who doesn't remember to put the handle back after use in the sim, certainly remembers the next time to do so...!
I am informed from a post on R&N, (
DaveReidUK), that the full trimmable range for the HS takes "250" turns of the wheel. Since the full range is 17°, (AMM ATA27 for the -400), each turn of the wheel yields a 0.07° change in trim and to change the trim 1°, it takes approximately 14.7 turns of the wheel.
Earlier in this thread, with regard to stalling a highly-loaded HS drive system, a DC8 accident out of Montreal, (Dorval) airport was mentioned;
https://en.wikipedia.org/wiki/Trans-...nes_Flight_831 . Link to the final report:
https://reports.aviation-safety.net/...0%20CF-TJN.pdf
A few months later, and Eastern Airlines DC8 appeared to have suffered the same issue:
https://en.wikipedia.org/wiki/Easter...nes_Flight_304
PJ2