2691. If you do not install the rigging pin, the elevators will move down when there is no pressure in the system

After the system is pressurized, the elevators will drop down no matter where the rigging pin is installed.

Without the rigging pin, the elevators will go down when there is no pressure in the system.

The rigging pin can prevent the elevators from retracting and expanding when the system is de-energized.

正确答案：B

设备系统操作理论翻译

扫码进入小程序
随时随地练习

672. Maintenance information shall include General procedural instructions and application of protective treatments after inspection

671. Explain how to avoid and notice fuel contamination

670. Remove the remaining sealant from the floor covering

669. 抓住螺丝刀松开卡子

668. 确保传感器处无液压油渗漏

667. Each page shall bear the date of the original issue until revised and, when revised, that of the latest revision

666. 所有页面上必须有制造商的报头,出版物标题,飞机型号,发行或修订日期。

665. Approved adjectives are given in their basic form, with their comparative and superlative forms in parentheses where applicable

664. The manufacturer may establish procedures to provide feedback on unairworthy conditions that were discovered when complying

663. To give or send signals that adjust, operate, or keep something to a limit,or that cause something to operate