Warning Systems

Warning Systems

Visual Warning Systems

• Warning systems gets inputs from GPWS, TCAS, Engine and Aircraft systems
• Alerts the crew to danger levels in the order of their priority
• Level A are red lights and require immediate attention
• Level B are amber lights requiring crew alertness and possible action
• Level C are in other colours requiring crew alertness without any action

Types of Visual Warning Systems

• Warnings are displayed as warning flags or danger lights
• Electronic Flight Information System may display warnings as symbols
• Master warning lights are attention getters which bring crew to attentive mode
• Red or amber warning signals trigger master warning lights

Audible Warnings

• Audible and sensory warnings are high levels of danger
• Pilot should immediately take positive control of aeroplane
• Audible warning includes warning sounds like in fire warning
• Synthetic voice warnings are generated by GPWS

Sensory Warnings

• Sensory warnings constitute high level warnings like stick shakers
• Stall warning devices are examples of sensory warning
• Stall protection system cannot be overridden by crew
• Elevator input is restricted and thrust automatically increased

Altitude and Speed Alerts

• Altitude alert warns of deviation from selected altitude
• Inputs from ADC or Radio altimeter go to altitude alert system
• Single sound is heard at 900 feet to go and stops at 300 feet to go
• Over speed warnings sound if speed exceeds maximum operating speed
• Inputs from ADC and Flight warning system go to over speed warning

Stall Warning System

• Stall warning activates near stall speed and angle of attack beyond limits
• AoA sensor, flap position, air speed and power are inputs to stall warning
• Weight on wheels switch avoid trigger of stall warning on ground

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