During normal operation, pneumatic manifold pressure rises above 52 pounds per square inch but remains below 67 pounds per square inch. What should the Nitrogen Generation System do?, The Nitrogen Generation System Controller closes both the Nitrogen Generation System Shutoff Valve and the Overtemperature Shutoff Valve immediately., The Nitrogen Generation System Shutoff Valve modulates to regulate downstream pressure to approximately 52 pounds per square inch., The Ram Air Valve opens fully to reduce system pressure through the heat exchanger., During climb, the aircraft passes 15,000 feet and the Nitrogen Generation System enters high-flow mode. Why is high flow initially maintained for approximately 10 minutes?, To pressurize the center fuel tank sufficiently before the aircraft reaches cruise altitude., To remove residual oxygen from the center fuel tank before low-flow operation begins., To warm and stabilize the Air Separation Module before the oxygen-sensor Built-In Test is performed., The Air Separation Module inlet temperature reaches 195 degrees Fahrenheit and remains there for more than 20 seconds, then continues at that temperature for another five seconds. What system response should occur at that point?, The Nitrogen Generation System changes to low-flow mode and records a latched fault., The Nitrogen Generation System Shutoff Valve and Overtemperature Shutoff Valve immediately close., No system reconfiguration occurs until 195 degrees Fahrenheit has been maintained for more than 120 seconds., The Ram Air Valve loses control pressure while the Nitrogen Generation System remains pneumatically supplied. What is the valve’s natural fail position and its effect on heat-exchanger cooling?, The valve remains fixed at its last commanded position., The valve moves closed, reducing ram-air flow to protect against thermal shock., The valve moves open under spring force, increasing ram-air flow through the heat exchanger., The Nitrogen Generation System filter differential-pressure switch changes state at approximately 1.2 pounds per square inch differential. What maintenance significance does this have?, The Air Separation Module has exceeded its maximum permitted oxygen concentration., The filter has developed sufficient restriction that replacement is required., The High Flow Valve has failed to achieve the commanded high-flow position., The Nitrogen Generation System Controller commands the Overtemperature Shutoff Valve open. How is the valve physically driven to the open position?, Energizing the solenoid vents chamber A to ambient, allowing pressure in chamber B to overcome spring force and drive the poppet open., The solenoid mechanically pulls the poppet against spring force without using pneumatic pressure., Energizing the solenoid increases pressure equally in chambers A and B and hydraulic balance moves the poppet open., Why is the Oxygen Sensor not used continuously to monitor the nitrogen-enriched-air oxygen concentration throughout the flight?, Continuous monitoring would cause excessive electrical loading on the Nitrogen Generation System Controller., Continuous sensor operation would reduce the required service life of the Oxygen Sensor., The Oxygen Sensor cannot operate in low-flow mode., During descent, why does the Nitrogen Generation System command the High Flow Valve open rather than remaining in the normal cruise low-flow configuration?, To provide sufficient cooling airflow to the Air Separation Module before landing., To increase nitrogen-enriched-air flow and pressurize the center fuel tank, reducing the amount of ambient air entering the tank., To perform the mandatory filter differential-pressure test before the aircraft reaches the ground., What is the combined purpose of the dielectric hose and flame arrestor installed in the Nitrogen Enriched Air distribution path through the left main wheel well?, They provide protection against electrostatic discharge, lightning effects and ignition propagation toward the center fuel tank., They regulate Nitrogen Enriched Air flow pressure before the air enters the center fuel tank., They prevent liquid fuel from travelling from the center tank back toward the Air Separation Module., The Nitrogen Generation System Operability Indicator shows the amber INOPERATIVE light. What action is required before releasing the aircraft?, No maintenance action is required provided the fault is recorded and the system remains in low-flow mode., The Nitrogen Generation System Shutoff Valve must be manually closed and locked, and the fault must be recorded., The Nitrogen Generation System must pass only the Built-In Test Equipment display test before release.

ATA 47

by
Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?