2269.On B757 the external power of electrical system is checked by BPCU before supplied to its electrical network.If the EXT PWR is checked normal,the contactor is closed.

A. Make sure that the pressure in the cabin is almost zero.

B. Verify that the cabin pressure is not above zero.

C. Ensure that the pressure in the cabin is completely zero.

A. 在《持续适航维修大纲》检验编号中的章节编号的两位数字中,第一位数字由 GAMA规范 2 号编号系统确定,第二位数字由制造商依次确定。

B. 在《持续适航维修大纲》检查编号的两位数字中,第一位数字由 GAMA 2 号规范编号系统决定,第二位数字由制造商按顺序决定。

C. 在《持续适航维修大纲》检查文件编号中代表节号的两位数字里,第一位数字应遵守

D. C. 在《持续适航维修大纲》检查文件编号中代表节号的两位数字里,第一位数字应遵守

E. GAMA 2 号规范的编号体系,第二位数字由制造商按相应的顺序确定。

A. Record the results if the frequency changes.

B. Alter the phase and record the results.

C. Change the frequency and record the results.

A. 这些断流开关操作断流活门,断流活门是安定面配平控制模块的一部分,隔离到尾部的安定面配平组件的液压动力。

B. 这些切断活门由切断电门操作,切断电门是安定面配平控制模块的一部分,将液压动力隔离到尾部的安定面配平组件。

C. 这些由关闭电门操作的切断阀门可以作为稳定器配平控制模块的一部分,隔离流到尾部的稳定器配平组件的液压动力。

A. Clean the surface to make sure that the sealing is satisfactory.

B. Clean surfaces to ensurethe bonding as required.

C. Clean the surface to make sure that the bond is satisfactory.

A. Briefly describe and explain principle of operation of any new kinds of flight instruments.

B. Briefly introduce the operation principal ofany new kinds of flight apparatus."

C. Briefly describe and explain the operation principle ofany new kinds of flight displays."

A. The turbines are used to extract energy from the exhaust gases and are coupled to the crankshaft.

B. The turbines can drive energy to exhaust gas and connects crankshaft.

C. The turbines can extract energy from the exhaust gases and drive the crankshaft.

A. Three computers collect data and put them together on the data link to the display unit.

B. Three computers collect data and put them together on the data upload to the display unit.

C. Three computers collect data and put them together on the data conveyed to the display unit.

A. CAP 不改变或替代任何规定,而是作为飞机维修手册或服务信函的一部分。

B. 建立 CAP 的意图并不是要改变或取代适用的飞机维修手册或服务信函的任何部分。

C. CAP 对任何不适用于飞机维修的手册或服务信函部分做更改或替代。

A. Visual difference is acceptable between the previous surface and the new surface.

B. There should be no visual difference between the initial surface finish and the new surface finish.

C. It is forbidden to have acoustic difference between the former surface finish and the new surface finish.