Crew Alerting System Flashcards
What does the CCAS provide?
- Warnings
- Malfunctions
- Abnormal situations
- Flight envelope deviations
What is the design principle?
Lights out
Where will an MFC failure be indicated?
On the CAP
How will crew get alerts in case of an MFC failure?
Crew will have to monitor for local alerts
What systems are only associated with CAP alerts?
- parking brake
- GPWS fault
- maintenance panel
Can only be extinguished by corrective action
What is the alerting process?
1 - fault is detected by MFC and crew are notified by aural and visual alerts
2 - crew checks CAP to check which systems are affected
3 - crew finds pb for faulted system and takes appropriate action
What alerts are not processed by the MFC?
- engine fire
- excess cabin differential pressure
- excess cabin altitude
- nacelle 2 overheat
- smoke
local alerts only
What is a Level 0 alert?
Notify crew of situations not abnormal but of temporary nature
Blue, green or white lights
What is a Level 1 alert?
Take place without CCAS activation
Signal the degradation of a system or a loss of redundancy
Local amber alert without chime
What is a Level 2 alert?
Cautions
Yellow master caution
Single chime aural alert
Amber alert on CAP
Does not require immediate action (QRH)
What is a Level 3 alert?
Warnings
Red master warning
CRC
Red light on CAP
Immediate corrective action required
How are the CAP bulbs tested?
Two bulbs each
Tested with the annunciator light test switch during pre-flight
What does the RCL button do?
Bring back any existing faults that were previously cleared with CLR button
Performed during descent and app phase
What does the CLR button do?
Extinguish any amber CAP lights and reset MFC for that system
If CAP not cleared after a fault, crew will not be alerted to a subsequent fault of that system
What does the TO INHI button do?
Inhibits CCAS alerts for non emergency conditions during take off roll
What Level 3 warnings are inhibited by the TO INHI?
Smoke warnings and engine oil
When is the to inhibit cancelled?
- when landing gear unlocks for retraction
- recall button pressed
How are nuisance alerts cancelled?
The emergency cancel toggle switch
Affected system will not provide another warning unless:
- MFC reset by cycling aircraft power
- MFC 1B/2B is reset
- Recall pb is pressed
- To config test
Excluded warnings from emergency cancel?
- landing gear not down CRC
- Vmo/Vfe/Vle overspeed clacker
- stall warning cricket
- pitch trim whooler
- ap disengaged
Excluded warnings from emergency cancel?
- landing gear not down CRC
- Vmo/Vfe/Vle overspeed clacker
- stall warning cricket
- pitch trim whooler
- ap disengaged
What does the to config test?
- flaps in to position
- pitch trim in the green arc
- aileron lock is disengaged
- pwr mgt is in to position
- travel limiting unit is in the LO SPD config
What will happen if to config test is incorrect?
- master warning will flash
- CRC
- CONFIG will illuminate on the CAP
- FLT CTL will illuminate if pitch, trim or flap are not correctly positioned or if AIL LOCK is illuminated
- ENG will illuminate if the pwr mgt knob is not in take off position
What alerts will you get if MFC 1B and 2B fail?
- Master caution lights will illuminate with no aural warnings
- MFC annunciated on CAP
- MFC 1B and 2B fault lights on overhead panel
What alerts will you NOT get with MFC 1B and 2B failure?
- All level 2 alerts
- Level 3 - configuration, eng oil, prop brk,
- Rest of level 3s will only be processed by the CAP (no master warning or CRC)
What triggers an altitude alert?
When ac approaches 1000ft of the target altitude selected on ADU
Signals entering 250ft capture zone
When do you get an overspeed alert Vle?
180 kt
When will you get an overspeed alert Vfe?
Flaps 15 - 180kt
Flaps 30 - 145kt
When will you get the pitch trim alert?
When the pitch trim is in motion for more than 1 sec
How are stall warnings detected?
By AoA probes
CCAS will produce aural alert and MFC will activate the stick shaker
MFC will activate stick pusher - operational as long as any two MFCs are working
When is normal stall warning?
10.9 degrees AoA in non icing
When is stall warning in icing conditions?
Between 7.7 and 8.4 degrees AoA in Cruise depending on flap position
8.4 degrees within ten minutes of take off or until flaps are retracted
When are the stall alarm and stick pusher inhibited?
When the aircraft is on the ground
When does stick pusher triggering occur?
Between 10.6 and 14.3 degrees, depending on power setting, flaps and horn anti ice selection
When is stick pusher activation inhibited?
During first 10 seconds after lift off and within 500 ft of the ground (provided RA working)
