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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 Notice6 o" p* q9 d& a" f) T) J. N' [6 T
5 a) G4 |( o' m) U$ s0 ^Ongoing oversight activities by the FAA include:1 V. |" a( r5 O# V" d
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
/ `6 E+ W% J5 v3 Vprocedures associated with required pilot memory items. The FAA anticipates mandating these) T* K% F# M7 l5 o$ Q$ K; \# W
design changes by AD no later than April 2019.. _. D7 X" E @% \" F7 t
- Design changes include:
' _7 P$ E. P3 D& t" c4 M+ v, w MCAS Activation Enhancements
; J$ E m; B/ B9 G4 x' M( V MCAS AOA Signal Enhancements
4 M C t( b' K MCAS Maximum Command Limit+ {( N# J8 C1 k1 Y
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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! a% g, @" y( A# D+ k) u! z( F% S
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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)+ Q" H3 D; H5 M! s
, [1 a9 x: k. s, p0 {$ B6 e; q3 W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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