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本帖最后由 holycow 于 2019-3-14 16:19 编辑 , P# v1 v6 u8 D8 G# N1 d
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这是FAA几天前发的Continued Airworthiness Notice4 x/ b: c+ b- L6 r/ K _9 Q$ V
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Ongoing oversight activities by the FAA include:8 x, a2 K7 t8 }( Q
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
. I- R6 G8 g: J1 D' mprocedures associated with required pilot memory items. The FAA anticipates mandating these
9 v$ ~' |% O |- S6 @design changes by AD no later than April 2019.
( E) G. i6 g1 B: h* V- Design changes include:( b: Y6 P; O' z( z/ r
MCAS Activation Enhancements
. R) w a) ?5 ]: _ MCAS AOA Signal Enhancements f3 t3 }/ \- o- Z0 a$ |- W \
MCAS Maximum Command Limit/ K8 Y4 t0 s$ E, {
4 y3 e! S8 @3 V0 W/ h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MCAS4 z9 a- E) n( Z' G9 j- P
$ I1 ?% D" \4 `. m; B7 IMaximum 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)8 m5 m, Q* F( B# ]0 \! n3 b7 V
1 U( i& R: u$ N2 N8 u% B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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