737NG方向舵自由度检查,是定检项目,MPD 27-064-00,当前的手册工卡英文描述存在歧义,容易导致误解:
参考手册:
AMM TASK 27-21-00-700-814-001/002
Rudder Hinge Bearing and PCU Bearing Freeplay
很多人估计在定检中做过这个项目。这里这句话容易导致误解:
Make sure the difference between the left and right positions is not more than 0.05 in.(1.3 mm).
比如向左自由度为A,向右自由度为B,很容易理解为是A-B不超过0.05英寸,实际上这里应该是A+B不超过0.05英寸。
对比其他的舵面自由度检查,手册描述很好理解,就是两个方向的自由度之和不超过限制值,没有这里这样的问题:
升降舵(MPD 27-098-01)
AMM TASK 27-31-32-200-804,Elevator Output Torque Tube Buss Linkage Freeplay - Check
副翼(MPD 27-035-00)
AMM TASK 27-09-91-200-801
副翼调整片(MPD 27-033-00)
AMM TASK 27-09-91-200-806,Aileron Balance Tab Freeplay - Inspection
厂家计划在15-OCT-2022改版手册:
现有的Make sure the difference between the left and right positions is not more than 0.05 in. (1.3 mm).
将会修改为:Make sure that the total left and right freeplay of the rudder is not more than 0.05 in. (1.3 mm).
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