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本帖最后由 holycow 于 2019-3-14 16:19 编辑 . k' `) y" H( |( `1 k
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这是FAA几天前发的Continued Airworthiness Notice# N( j' T+ Y/ q. r7 D; r- c) k! K
. u; F' k" e# A' j% n& ]5 AOngoing oversight activities by the FAA include:, \9 d1 q y1 l( @- V" D" S
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
6 Y; C+ ~- a5 w; ^8 aprocedures associated with required pilot memory items. The FAA anticipates mandating these" @0 b( z0 ] p2 H, Y* X4 w% |6 c
design changes by AD no later than April 2019.
6 j2 d6 s/ }( H3 R- Design changes include:$ ?1 O' L! u6 h- U5 l. ? T
MCAS Activation Enhancements
% L4 t1 A) p9 a0 `* ]/ U MCAS AOA Signal Enhancements
! |1 l+ K+ l. ?7 K( { MCAS Maximum Command Limit5 k+ J5 D4 N; A& {5 P' C
- X/ ]8 K; W1 }# H$ p, P1 ^; x, [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MCAS
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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)
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4 D& N; L4 ?/ B- }2 f( k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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