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这个问题其实在机务在线上也有人问到过：
https://www.airacm.com/read/375806/
正常形态着陆数据很全，但所有的非正常形态着陆，都没有自动刹车选3 的 着陆距离数据，请问什么原因？
查了下，公司也有人问到过。
Q1) Non-normal configuration landing distance in PI section of QRH, why does QRH provide autobrake 2 for dry runway, braking action good, good to medium, while autobrake 3 for medium, medium to poor, poor?
A1) In the Flight Crew Training Manual (FCTM), page 6.37, the following information is presented for "Automatic Brakes:"
Use of the autobrake system is recommended whenever the runway is limited, when using higher than normal approach speeds, landing on slippery runways, or landing in a crosswind.
For normal operation of the autobrake system select a deceleration setting.
- MAX: Used when minimum stopping distance is required. Deceleration rate is less than that produced by full manual braking.
- 3: Should be used for wet or slippery runways or when landing rollout distance is limited. If adequate rollout distance is available, autobrake setting 2 may be appropriate.
- 1 or 2: These settings provide a moderate deceleration suitable for all routine operations.
Based on this information, which is in agreement with discussions with Boeing Technical Pilots, it was indicated an Autobrake 1 setting would not be used in non-normal situations. As a result, Autobrake 2 was selected as a "lower bound" for the use of autobrakes and it was decided to use Autobrake 2 for Dry Runway and Good Reported Braking Action, and to use Autobrake 3 for Medium and Poor Reported Braking Action. With the introduction of the intermediate braking actions with TALPA, Good-to-Medium follows the Good, and Medium-to-Poor uses the Medium and Poor information.
参考机组训练手册(FCTM), page 6.37关于自动刹车的信息：
基于这一信息，以及波音技术飞行员讨论一致认为，自动刹车设置1将不在非正常情况下使用。因此，选择自动刹车设置 2作为使用自动刹车的“下限”，并决定将自动刹车 2用于干跑道和报告的刹车效应好的自动刹车，将自动刹车 3用于中等和较差刹车效应报告的自动刹车。随着TALPA中间级刹车措施的推行，好到中等遵循好，中等到差使用中等和差的信息。
TALPA：起飞和着陆性能评估航空规则协会
个人认为应该是厂家在提供非正常构型自动刹车着陆距离数据时，应该是只给出了上限（MAX）和下限（刹车效应好：2；刹车效应中-差：3），这样简化了操作和提高了裕度。
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A320驾驶舱面板指南【03】
发表于 2022-3-4 13:07:11