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本帖最后由 holycow 于 2019-3-14 16:19 编辑
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这是FAA几天前发的Continued Airworthiness Notice2 [0 U# t; Z# e' D
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Ongoing oversight activities by the FAA include:8 q- U( b) I% Z$ r
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
# q' c- K9 o5 u3 y8 aprocedures associated with required pilot memory items. The FAA anticipates mandating these+ x1 W1 m1 b! P( S' |5 E! w% W
design changes by AD no later than April 2019.; g( M+ ~' D( \& G" H% T
- Design changes include:' X, n4 U/ \8 L4 r7 E, Q+ J5 y
MCAS Activation Enhancements
5 b" s/ V1 J, @2 \% ~* N0 W MCAS AOA Signal Enhancements
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3 A, r t, B+ Z6 d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MCAS6 [" o7 l5 l- Q
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Maximum 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)2 |$ i! X k( w) f; ]% p; X! S+ p; Y6 ^
' s* A, ]; V$ H. n/ |, D& u4 X( P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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