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本帖最后由 holycow 于 2019-3-14 16:19 编辑
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! S& a9 l9 | m, y" h6 d1 q这是FAA几天前发的Continued Airworthiness Notice
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6 y6 {5 R3 P8 f6 X9 u0 dOngoing oversight activities by the FAA include: w, S8 G5 R- K
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
3 ] W7 F0 @$ H( f: r1 q7 ? tprocedures associated with required pilot memory items. The FAA anticipates mandating these
7 {, ^+ R# ?( q4 p1 o% R" ldesign changes by AD no later than April 2019.# l0 J) q2 K3 z6 y, F! K6 G! j
- Design changes include:. m8 L/ s( j+ E& {4 j6 d, W0 c" j+ `
MCAS Activation Enhancements
! w6 Q* |% f9 c' i; E, {/ m: m MCAS AOA Signal Enhancements1 ?/ b* ^& s8 j S! y, A+ U7 L
MCAS Maximum Command Limit( W, h$ |& w! Y, g; N
2 m. \4 R! M" z/ 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MCAS2 O7 K' {7 {8 c5 n! Z
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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)" ^1 A0 r h, {/ D8 O- g. ?% M
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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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