Reader Kenneth Madl spoke eloquently of “Lockheed’s Earlier ‘Magic,’” (AW&ST July 21, p. 8). But I would like to offer one small correction: The Direct Lift Control on Lockheed L-1011s used the spoilers, not the slats, to vary the lift on the wing on landing approach. If landing flaps of 33 or 42 deg. were selected, the spoilers would deploy approximately 25% and modulate up or down, depending on yoke or autopilot pitch input. As an aside, Delta Air Lines, ...

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