CAUTION AND WARNING SYSTEM

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CAUTION AND WARNING SYSTEM

• SHUTTLE AND ISS

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Reason for Caution and Warning

• The caution and warning system (C/W) is used to
  alert crew members of any off-nominal conditions
  and crew safety hazards.

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Interfaces

• Auxiliary Power Units
• Data Processing System
• Guidance Navigation and Control
• Environmental Control and Life Support System
• Electrical Power System
• Hydraulics
• Payloads
• Orbital Maneuvering System
• Main Propulsion System

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C/W System Overview
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Classifications

• Class 1 Emergency
• Class 2 Caution and Warning
• Class 3 - Alert

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Class 1 Emergency

• Hardware monitored
• Smoke detection and fire suppression
• Rapid cabin depressurization (dP/dT)
• Smoke Detection
• Ionization detection
• Avionics bays
• Air ducts
• Flight deck
• Middeck

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Class 1 cont.

• Aural alarms
• Sent to speaker boxes and crew headsets
• Siren smoke detection
• Klaxon cabin depressurization
• Visual alarms
• 4 master alarms
• smoke detection light on panel L1
• C/W backup smoke alarm message
• dP/dT on SM SYS SUMM 1 display

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Class 2 C/W

• Primary System
• Hardware monitored
• 120 inputs with limits
• 39 appear on F7 panel
• Three modes of Operation
• Normal
• Ascent
• Acknowledge

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Class 2 cont.

• Backup system
• Software monitored
• 69 backup alarms
• Limits can be changed thru R13U panel
• The rest are produced by navigation and control
• Aural alarms
• Visual alarms
• 4 master alarms
• 40 light annunciator on panel F7
• Back up C/W alarm

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Class 3 Alert

• Alerts crew members of conditions leading to a
  Class 2 problem or may take a long procedure to
  correct them.
• Software run system
• Visual alarms
• Blue SM alert on panel F7
• Fault message readout

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R13U Panel

• Crews interface with the 120 parameters that the
  C/W system monitors
• Can set or check upper and lower limits for each
  parameter
• Readout is in volts

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R13U Panel
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Questions?