1209、Make sure that there is tension in the lockwire.

280、 Put a transparent sheet of plastic on the surface.

279、 He removed the access panel to see the corroded tube.

278、Engine Controls and Instruments include, definitions, descriptions or explanations of the following termsor components. The definitions, descriptions land explanations provided are examples. Those used in aparticular Handbook should be appropriate for that particular airplane of installation.

277 、 Airline operators are encouraged to evaluate their particular 737NG operating environment, accompanied with debris findings at time of leaning to identify and implemen（t 执行）the most effective andeconomic maintenance interval. 鼓励航空公司运营商评估其特定的 737NG 运行环境，并在倾斜时发现碎片，以确定和实施最有效和经济的维护间隔

276、Provide ventilation for lavatories and galleys.

275、Fill the space between the patch and the adjacent structure with sealant.

274、If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on therear of the display units.

273、The system design makes sure that two AC power sources can not supply power to the same transferbus at the same time.

272、This will be limited to the forward and aft edges of the windshield due to the bottom edge not beingvisible and the top edge having the bus bar in the way. 这将是有限的向前和尾部边缘的风挡玻璃由于底部边缘不可见和顶部边缘有母线在路上。

271、Airworthiness Directive is procedure that must be used when performing maintenance on an aircraft