CENTRAL WARNING SYSTEMS 1. GENERAL This section describes the Central Warning Systems which consists of a Crew Alerting System (CAS) and related sensors and switches. A. Crew Alerting System Aircraft annunciations and alerts are displayed in the Crew Alerting System (CAS) window located to the right of the altimeter and VSI. Aircraft annunciations are grouped by criticality and sorted by order of appearance with the most recent message on top. The color of the message text is based on its urgency and required action: Warning (red) Immediate crew awareness and action required. Caution (yellow) Immediate crew awareness and future corrective action required. Advisory (white) Crew awareness required and subsequent action may be required. In combination with the CAS window, the system issues an audio alert when specific system conditions are met and an expanded description of the condition is displayed in the Alerts Window located in the lower RH corner of the PFD. For additional Crew Alerting System information for the Perspective + Integrated Avionics System refer to the latest revision of Cirrus Perspective + Line Maintenance Manual. (Refer to 05-00) Refer to the following Figures for detailed descriptions of CAS messages. (See Figure 1) (See Figure 2) (See Figure 3) (See Figure 4) (See Figure 5) (See Figure 6) Page 1
2. TROUBLESHOOTING A. Warnings CAS Warning Text Alerts Window Text Definition AUTO DESCENT Aircraft descent to 14,000 feet in 60 seconds. Emergency descent warning. AUTO DESCENT Aircraft descent to 14,000 feet. Emergency descent in progress (initial descent) AUTO DESCENT Aircraft descent to 12,500 feet. Emergency descent in progress (secondary descent) BRAKE TEMP Brake temperature is high. Brake temperature > 293 F. CHT CO LVL HIGH Cylinder head temperature is high. Carbon monoxide level is too high. Temperature of one or more cylinder heads > 500 F. Carbon monoxide level is too high. ESS BUS Check essential power bus voltage. Voltage output for Alternator 1 or Alternator 2 < 24.5v for more than 20 seconds or > 32.0v. This is usually associated with an Alternator 1 or Alternator 2 failure and will be displayed in combination with a M BUS 1 or M BUS 2 voltage annunciation for the corresponding Alternator. FUEL FLOW Check fuel flow. Fuel flow > 30 GPH. FUEL QTY Check fuel tank levels. Fuel Totalizer quantity < 9 gallons. M BUS 1 M BUS 2 Check main power bus 1 voltage. Check main power bus 2 voltage. Alternator voltage output > 32.0v. This is usually associated with an alternator failure Alternator voltage output > 32.0v. This is usually associated with an alternator failure OIL PRESSURE Oil pressure is out of range. Oil pressure < 25 psi or > 115 psi. If low oil pressure is low, the engine has probably lost a significant amount of its oil and engine failure may be imminent. If low oil pressure is accompanied by normal oil temperature, it is possible that the oil pressure sensor, gage, or relief valve is malfunctioning. OIL TEMP Oil temperature is high. Oil temperature > 245 F. RPM Check engine RPM. Engine speed is between 2710 RPM and 2730 RPM for 10 seconds or more, OR engine speed > 2730 RPM for 5 seconds or more. Figure 1 CAS Warning Messages Page 2
CAS Warning Text Alerts Window Text Definition STALL Stall warning. Impending stall. START ENGAGED Starter is engaged. Starter stuck engaged. MCU detects 24 VDC to Starter 30 seconds after initial engagement. UNDERSPEED PROTECT ACTIVE B. Cautions None Figure 1 CAS Warning Messages (Continued) Underspeed Protection (USP) is active. CAS Caution Text Alerts Window Text Definition ALT 1 Check alternator 1 current. Illumination of ALT 1 indicates that the ampere output < 2 amps for 20 seconds or more. ALT 2 Check alternator 2 current. Illumination of ALT 2 indicates that the ampere output < 2 amps for 20 seconds or more. ALT AIR OPEN Alternate air door is open. Alternate air door is open. AP MISCOMPARE Autopilot miscompare, autopilot is not available. Autopilot miscompare, autopilot is not available. AP/PFD DIF ADC AP/PFD DIF AHRS Autopilot and PFD are using different ADCs. Autopilot and PFD are using different AHRSs. Autopilot and PFD are using different ADCs (ADAHRS). Autopilot and PFD are using different AHRSs (ADAHRS). AVIONICS OFF AVIONICS switch is off. AVIONICS switch is off. BATT 1 Check battery 1 current. Battery 1 current is discharging at a rate > 4 amps for 30 seconds or more. BRAKE TEMP Brake temperature is high. Brake temperature is between 270 F and 293 F for more than 5 seconds. CHT FLAP OVERSPEED Cylinder head temperature is high. Flaps are extended beyond airspeed limitations. Temperature of one or more cylinder heads has exceeded 435 F. Flaps at 100%, airspeed > 115 KIAS for 5 seconds or more, OR Flaps at 50%, airspeed > 155 KIAS for 5 seconds or more. FUEL QTY Check fuel tank levels. Check fuel tank levels. M BUS 1 Check main power bus 1. Illumination of M BUS 1 indicates that the alternator voltage output < 24.5v. This is usually associated with an alternator failure. Figure 2 CAS Caution Messages Page 3
CAS Caution Text Alerts Window Text Definition M BUS 2 Check main power bus 2. Illumination of M BUS 2 indicates that the alternator voltage output < 24.5v. This is usually associated with an alternator failure. NO ADC MODES NO VERT MODES Autopilot air data modes are not available. Autopilot vertical modes are not available. Autopilot air data modes are not available. Autopilot vertical modes are not available. OIL PRESSURE Oil pressure is out of range. Oil pressure between 25 psi and 55 psi at or above 1000 RPM. This message will appear prior to engine start and should clear after engine start. OIL TEMP Oil temperature is high. Oil temperature is > 240 F. PARK BRAKE Parking break is set. Parking break is set. PITOT HEAT FAIL Pitot heat failure. Pitot heat failure. Displayed when Pitot heat switch is ON and Pitot heat current is not detected. PITOT HEAT REQD Pitot heat is required. Displayed 20 seconds after system detects OAT < 41 F (5 C) and Pitot Heat Switch is OFF. START ENGAGED Starter is engaged. Starter stuck engaged. MCU detects 24 VDC to Starter 15 seconds after initial engagement. C. Advisories Figure 2 CAS Caution Messages (Continued) CAS Advisory Text Alerts Window Text Definition ALTITUDE SEL ALTITUDE SEL Climbing away from selected altitude. Descending away from selected altitude. Climbing away from selected altitude for more than 5 seconds. Descending away from selected altitude for more than 5 seconds. ARE YOU ALERT? Are you alert? No pilot interaction within a reasonable time period. COURSE SEL Current track will not intercept selected course. Current track will not intercept selected course. L FUEL QTY Check left fuel tank level. Left fuel quantity < 18 gallons. R FUEL QTY Check right fuel tank level. Right fuel quantity < 18 gallons. Figure 3 CAS Advisory Messages Page 4
D. Comparator Window Messages Comparator Window Text ALT MISCOMP IAS MISCOMP HDG MISCOMP PIT MISCOMP ROL MISCOMP ALT NO COMP IAS NO COMP HDG NO COMP PIT NO COMP ROL NO COMP Difference in altitude sensors > 200 ft. If both airspeed sensors detect < 35 knots, this is inhibited. If either airspeed sensor detects > 35 knots, and the difference in sensors > 10 kts. If either airspeed sensor detects > 80 knots, and the difference in sensors > 7 knots. Difference in heading sensors > 6 degrees. Difference in pitch sensors > 5 degrees. Difference in roll sensors > 6 degrees. No data from one or both altitude sensors. No data from one or both airspeed sensors. No data from one or both heading sensors. No data from one or both pitch sensors. No data from one or both roll sensors. E. Reversionary Sensor Messages Figure 4 CAS Comparator Window Messages Reversionary Sensor Window Text USING ADC2 The PFD is displaying ADC data from ADAHRS 2. USING AHRS2 The PFD is displaying AHRS data from ADAHRS 2. F. Alert Messages Figure 5 CAS Reversionary Sensor Messages Alerts Window Message CO DET FAIL The carbon monoxide detector is inoperative. Carbon monoxide detector fault. CO DET SRVC The carbon monoxide detector needs service. ESP CONFIG ESP config error. Config service required. Carbon monoxide detector fault. ENABLE / unlock mis-match for ESP. Software for ESP option was not installed as specified in Service Bulletin 2X-22-07. Figure 6 CAS Alerts Messages Page 5
Alerts Window Message ESP FAIL ESP is inoperative. ESP OFF ESP selected off. ESP DEGRADE ESP IAS mode is inoperative. FAILED PATH An autopilot servo data path has failed. MFD FAN FAIL The cooling fan for the MFD is inoperative. PFD FAN FAIL The cooling fan for PFD is inoperative. GFC 700 is unavailable. Pilot DISABLED ESP. ADC failure, limited GFC availability. Servo or servo wiring fault. Cooling fan fault. Cooling fan fault. Figure 6 CAS Alerts Messages (Continued) Page 6