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本帖最后由 holycow 于 2019-3-14 16:19 编辑 / A6 m7 M3 d4 d& L( {. y" [
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! w' R# l7 P V* j这是FAA几天前发的Continued Airworthiness Notice0 z: z5 G% P: p
4 w$ P7 h) i# EOngoing oversight activities by the FAA include:
5 ^' d- I1 H9 G) e: U3 Y* a- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on" A; T. ]3 _% b9 e6 @0 L
procedures associated with required pilot memory items. The FAA anticipates mandating these
: N1 H+ c) P( N$ h1 B# k/ cdesign changes by AD no later than April 2019.3 i9 x; \. Y( z, }" s$ b/ O" V
- Design changes include:; n6 ] k+ w! q- G
MCAS Activation Enhancements% N+ _) c# s5 b* \) c! u9 \. g
MCAS AOA Signal Enhancements9 C5 O! O# C w5 P& \" k7 ?' u" j/ }
MCAS Maximum Command Limit( ^1 A6 G/ L+ J, o' T
# a9 t6 }# u1 u那两个bold items, signal那个我看到的解释是任何时候输入信号都只有一路,reset MCAS可以左右切换,但有左边没右边,有右边没左边。第三路信号是进standby display, 根本不进MCAS5 z' W4 M# P( F$ z) w: H" }- T
# |7 g9 I+ O3 L' [; bMaximum Command Limit,很简单,要求任何时候不能剥夺elevator的authority。反过来看,现在就是stab trim到一定位置就剥夺了elevator的authority(不加限制的必然结果)7 X/ V9 P- k% U- @2 x
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扰流片的问题,有人现在提出来MAX的spoiler从NG的机械控制改成FBW, 然后各种scenario, 那部分我还没有完全看明白 |
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