Forgive me but I couldn't find this in a search on A.net. Got 3 questions about the unique 727 LE flaps:
1. Why were LE Kreuger flaps installed inboard and conventional LE slats outboard (same can be said for the 737)?
2. What's the purpose of the "fence" on the inboard-most LE slats?
3. Why did only two (on each wing) LE slats extend at the lowest flap setting, followed by all the rest on the next setting, versus all coming down at once like most other jetliners? The 32x, MD-80 and DC-10, for example, have LE slats that extend together, and at higher flap settings they extend even further, but still together.
Thanks in advance for any insight. As many of us know, the 727 was groundbreaking in its time, with its triple-slotted TE flaps designed to allow the 727 to operate from shorter runways...so surely the LE flap design, as diverse as it was, was designed with the same purpose in mind.