Originally Posted by
A0283
737 Driver the image you posted has only one of the smaller strakes ... so when was the second strake introduced ... my guess based on Takwis answer and PEI's post is the -600 to -900 ... so you would expect a reason for that... do you know what 737-model that KLM plane was?
737 Driver in the image that I posted I indicated the difference between the 'trapdoor' and the 'leading edge' ...IIRC the trapdoor opens down and forward and is as far as I could see not a part of the moveable leading edge/slats ... it would require a detailed picture of a MAX to clear that up I guess (would be nice to see one),
The picture was found online by Takwis, and there was no explanation of its context. I was merely assisting him with posting it. As far as your other queries, I have reached the extent of my expertise in these matters except to say that apparently someone thought these devices were necessary to accommodate the changes in airflow around the new engines.