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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 Notice' A! j8 z! N2 S/ a( Y' o
- o0 a3 B' M% [" s! S: ] c8 bOngoing oversight activities by the FAA include:
1 J0 N, W6 A, z8 W! p- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
0 }2 k" P9 O, d9 F- O) G' M v1 E: Kprocedures associated with required pilot memory items. The FAA anticipates mandating these
' A% f$ B: {3 r/ x) I' n7 Edesign changes by AD no later than April 2019.
" B: Q; z6 [& y$ v$ _3 D- Design changes include:
E9 L# ?& P" x MCAS Activation Enhancements
- Z0 [9 x( _" R; G3 d. h( W MCAS AOA Signal Enhancements
- ~3 Z) m* O0 Z+ R MCAS Maximum Command Limit) W1 U* i3 n" D) c" m+ `- ]; ?4 |
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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
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- o" c& p; w9 L( PMaximum 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)( N' Y# b9 @; y o7 u
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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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