This controller is applicable to all systems. Thus, it can also control thermal oil heaters.

A. The positive pressure relief valves are fail safe devices. If the aft outflow valve cann’t be closed, these positive pressure relief valves bleed fuselage pressure overboard.

B. The positive pressure relief valves are fail safe devices. If the positive pressure relief valves fails closed, these aft outflow valve bleed fuselage pressure overboard.

C. The positive pressure relief valves are fail safe devices. If the aft outflow valve fails closed, these positive pressure relief valves bleed fuselage pressure overboard.

A. Remove the smooth areas with cotton cloth if you find them.

B. If you find alligatored areas, remove them with cotton cloth.

C. If there are rough areas, remove them with emery cloth.

A. 使用符号代表电磁活门，显示该活门是否是弹簧加载到开位或关位。

B. 应针对电磁活门标明注意事项，说明该活门应该弹簧加载到开位还是关位。

C. 电磁活门应标有符号，表明该活门是弹簧加载到开位还是关位。

A. The wheel chocks must be put forward of the wheels while the aircraft is on the ramp.

B. If the aircraft must be parked on the apron, put the wooden blocks in front of the wheels.

C. If you must park the aircraft on a slope, make sure that wheel chocks are in front of the wheels.

A. The reserved 45 minutes for use in aircraft cruising power shall be calculated. Chart should provide information of the calculation method for the reserve.

B. To reserve 45 minutes for the flight at cruising power is calculated. The calculation method of reserves should provide additional diagrams and related instructions.

C. Reserve shall be computed as 45 minutes at the cruise power to be used for the flight. The explanation information presented with the chart should explain how the reserve was computed.

A. Independent, self-contained, gas reservoir assembly offers 7-9 seconds of pressure for operating after actuation.

B. Divided, self-contained, gas reservoir assembly stores the operating energy within 7-9 seconds prior actuation.

C. Single, self-contained, gas reservoir assembly provides the operating pressure within 7-9 seconds after actuation.

A. Using a locally made tool to do the test is also accepted.

B. You can also make a local tool to do this test.

C. You can also make a tool to do this test locally.

A. 用彩笔涂颜料。

B. 用刷子搅拌油漆。

C. 用刷子涂油漆。

A. 然而“紧急情况”反而总是排除需要立即快速反应的故障，例如整个动力装置故障、火灾或烟雾或机舱快速减压。

B. 然而“紧急情况”几乎总是包括需要立即快速反应的故障，例如整个动力装置故障、火灾或烟雾或机舱快速减压。

C. 然而“紧急情况”几乎总是排除需要立即快速反应的故障，例如整个动力装置故障、火灾或烟雾或机舱快速减压。

A. 当需要了解膜片时，使用箭头指示方向。

B. 必要时应使用箭头表示流向来理解原理图。

C. 利用箭头指示的方向来理解线路施工图。