The drain and vent system consists of lines collecting and carrying waste fluids and vapor overboard from the engine and nacelle accessories. Drains are provided to carry fluids from any point where lines and accessories may leak and where fluids may accumulate in a cavity. Fluid from forward and aft sumps, oil-fuel heat exchanger, VBV, and VSV are discharged overboard through drains. In addition, some drain lines serve as vents to carry air and vapor from the engine and accessory cavities.

A. Water above the kitchen floor can seep in through small holes in the floor surface, invisible to the naked eye.

B. Eyes cannot see the vapor which may penetrate through small holes of the floor surface in the galley.

C. Moisture above the galley floor can go through small holes in the floor surface area and stay out of view.

A. The manufacturer＇s marks, publication title, airplane model, and issue or revision date must shown on all pages.

B. The manufacturer＇s headline, publication title, airplane model, and issue or revision date must print on all pages.

C. The manufacturer＇s masthead, publication title, airplane model, and issue or revision date must appear on all pages.

A. Calibrated Airspeed means according to aircraft position, after correction instrument error, the aircraft display speed. Calibrated airspeed can be achieved when aircraft in flight in sea level standard atmosphere.

B. Calibrated Airspeed means the indicated speed of an aircraft, corrected for position and instrument error. Calibrated airspeed is equal to true airspeed in standard atmosphere at sea level.

C. Calibrated Airspeed is the speed of the aircraft shown on the instrument after error correction. The calibrated airspeed is the flight altitude and speed of a real aircraft under normal atmospheric pressure.

A. 相关警戒灯必须在30秒后熄灭。

B. 故障的警告灯必须在30秒后关闭。

C. 相关警告灯会在30秒后熄灭。

A. Write the instructions in the mandatory mode.

B. Write the instructions in the imperative form.

C. Write the instructions in the active mode.

A. Only number CAP pages that contain one chapter in sequence and identify the chapters.

B. Number the pages of CAPs containing only one section in sequence with section identification.

C. For the CAP pages that contain only a chapter in sequence, mark the chapters.

A. 所有射程距离应以海里为单位表示。

B. 所有航程值应以海里为单位。

C. 所有射程距离应以海里为单位。

A. 引擎多的飞机改出螺旋程序可由代理商分别编写。

B. 多发飞机的改出螺旋程序可由制造商选择。

C. 多台发动机的改出螺旋程序可以包含在飞机制造商的操作手册中。

A. Emergency Lighting is a independent subsystem used to provide illumination in case of primary electrical power failure.

B. Urgency Lights that supply the lights when the major electronic power fails is a separate subsystem.

C. Ambulance Lights is used to supply lights if the main electrical sources malfunctions as an independent subsystem.

A. 对退漆后的表面的修理必须是面积小于100平方英寸（645平方厘米），如果超过这一面积，则必须得到额外批准。

B. 对于分层的表面修理，面积不得超过100平方英寸（645平方厘米）。如果超出，你必须做部分更换。

C. 装饰面的修补面积必须小于100平方英寸（645平方厘米），如果超过这一面积，则必须更换该部件。