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Assignment 4-Cont. - 14020_304
Assignment 4-Cont. - 14020_306

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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4-47. Distribution of conditioned air to the cabin can be divided between air used for the cabin and air used for defogging the windshield. This distribution is accomplished by what action? 1. Selecting the appropriate position on the suit/cabin temperature control valve 2. Selecting the appropriate position on the air- conditioning system temperature/flow controller 3. Selecting the appropriate position on the windshield defogging switch 4. Selecting the appropriate position on the cabin defog plenum distribution valve with a control handle 4-48. Which of the following components provides the electrical signal that determines the position of the cabin add heat valve? 1. Cabin air overtemperature sensor 2. Cabin airflow\temperature sensor 3. Cabin/defog plenum distribution valve 4. Suit/cabin temperature control 4-49. Which of the following actions explains how air pressure and spring tension operate the cabin add heat valve? 1. Venting air pressure from the valve allows the valve to close against spring tension 2. Venting air pressure from the valve allows the valve to open under spring tension 3. Regulated air pressure to the valve and spring tension aid in opening the valve 4. Regulated air pressure to the valve overcomes spring tension opening the valve 4-50. When an overtemperature occurs in the cabin cooling system, the cabin air overtemperature sensor allows which of the following actions? 1. The cabin flow valve to open 2. The cabin/defog plenum distribution valve to close 3. The cabin add heat valve to close 4. The cabin ram air check valve to open 4-51. What component(s) in the cabin cooling and antifog system provide(s) for the automatic operation of the cabin flow valve? 1. Cabin/defog ram air solenoid only 2. Cabin/defog ram air solenoid and the cabin overtemperature sensor 3. Cabin airflow/temperature sensor only 4. Cabin airflow/temperature sensor and the air– conditioning system temperature/flow controller 4-52. Which of the following statements is correct regarding the automatic drain valve in the cabin cooling and antifog system? 1. It relieves excessive pressure 2. It regulates pressure in the system 3. It is open to drain moisture from the supply duct, it closes when pressure is applied 4. It drains the system of moisture when the switch on the air-conditioning system temperature/flow controller is turned on, and it closes automatically when pressure is applied to the system Learning Objective: Recognize the source for avionics cooling air and identify the components of the avionic cooling system and the function of each component. 27







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