TA的每日心情 | 奋斗 5 天前 |
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本帖最后由 holycow 于 2019-3-14 16:19 编辑
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' P& F9 v& b m F5 H* h+ Z这是FAA几天前发的Continued Airworthiness Notice0 W a/ u% }/ b% h7 `$ [( l
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Ongoing oversight activities by the FAA include:
: e7 i* f2 P5 m' m' J2 v7 V- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
7 A0 P: q6 k; F' gprocedures associated with required pilot memory items. The FAA anticipates mandating these; p+ A9 \% ~+ I1 C2 }1 T9 ]
design changes by AD no later than April 2019.6 A5 d* b ~( s% I$ H
- Design changes include:
$ U$ U0 c! |/ g5 g S6 M2 R/ H( {9 J MCAS Activation Enhancements8 \" R( t! o, _" v( e# U
MCAS AOA Signal Enhancements
6 J2 u/ x6 N/ v" }7 v MCAS Maximum Command Limit, z* |% x& ]7 D m( H% T2 n
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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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( n# T' _7 Q6 a: CMaximum 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)& d# o" N: o: l; p H- J
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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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