> For the complete documentation index, see [llms.txt](https://docs.flightsim-studio.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flightsim-studio.com/e-jet-series/systems-guide/main-panel/eicas/crew-alerting-system-cas.md).
# CREW ALERTING SYSTEM (CAS)
CAS window operation and simulated EICAS crew alerting messages in the aircraft model.
### CREW ALERTING SYSTEM (CAS) WINDOW
* Four message priority levels:
* WARNING (red): Indicates an emergency or airplane system condition that requires immediate corrective or compensatory crew action.
* CAUTION (amber): Indicates an abnormal operational or airplane system conditions that require immediate crew awareness and should require a subsequent corrective or compensatory action.
* ADVISORY (cyan): Indicates operational or airplane conditions that require crew awareness. Subsequent or future crew action may be required.
* STATUS (white): Indicates information/ status messages.
* STATUS LINE
* Selected by using the CCD. Turning the active CCD scroll knobs scrolls the alert message stack list under the CAS window.
* Indicates the number and type of messages out of the CAS window, and if they are located above or below.
* Warning messages are not scrolled out of the window.
***
### ROOT EICAS MESSAGES
* EICAS messages which may generate more messages with them are called Root EICAS messages and they are highlighted by a preceding chevron `>`.
***
### EICAS MESSAGE INHIBITION
* Some EICAS messages are inhibited on takeoff or approach and landing to prevent it from being a nuisance.
***
## Simulated CAS messages
The full EICAS catalog lists many more annunciations. This section covers messages currently driven by the aircraft WASM model. Use the priority tabs, then open a system group to read when each message appears.
{% hint style="info" %}
Takeoff-dataset cautions (REF ECS, REF A/I, NO TAKEOFF DATA) are under **Cautions → Engines & takeoff dataset**. See also TRS – Thrust Rating System.
{% endhint %}
{% tabs %}
{% tab title="Warnings" %}
Doors & emergency lights (6)
**DOOR CRG AFT OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
**DOOR CRG FWD OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
**DOOR PAX AFT OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
**DOOR PAX FWD OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
**DOOR SERV AFT OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
**DOOR SERV FWD OPEN**
Shown when the indicated door is open while an engine is running or the aircraft is airborne.
Fire protection (5)
**APU FIRE**
Shown from the fire test panel or fire detection logic.
**CARGO AFT SMOKE**
Shown from the fire test panel or fire detection logic.
**CARGO FWD SMOKE**
Shown from the fire test panel or fire detection logic.
**ENG 1 FIRE**
Shown from the fire test panel or fire detection logic.
**ENG 2 FIRE**
Shown from the fire test panel or fire detection logic.
Electrical (3)
**BATT 1-2 OFF**
Warning when both main batteries are switched off while the aircraft needs electrical power.
**BATT DISCHARGING**
Shown when the indicated battery is discharging.
**ELEC EMERGENCY**
Shown when the electrical system is in emergency configuration.
Air conditioning & pressurization (1)
**CABIN ALTITUDE HI**
Warning when cabin altitude exceeds the CPCS high-altitude threshold.
Fuel (1)
**FUEL 2 LO LEVEL**
Shown when fuel quantity in the indicated tank is low.
{% endtab %}
{% tab title="Cautions" %}
Doors & emergency lights (2)
**EMER LT NOT ARMED**
Shown when the simulator detects: emer lt not armed.
**EMER LT ON**
Shown when the simulator detects: emer lt on.
Electrical (19)
**AC BUS 1 OFF**
Shown when ac bus 1 off is detected by the monitored system.
**AC BUS 2 OFF**
Shown when ac bus 2 off is detected by the monitored system.
**BATT 1 DISCHARGING**
Shown when the indicated battery is discharging.
**BATT 1 OFF**
Shown when batt 1 off is detected by the monitored system.
**BATT 2 DISCHARGING**
Shown when the indicated battery is discharging.
**BATT 2 OFF**
Shown when batt 2 off is detected by the monitored system.
**DC BUS 1 OFF**
Shown when dc bus 1 off is detected by the monitored system.
**DC BUS 2 OFF**
Shown when dc bus 2 off is detected by the monitored system.
**DC ESS BUS 1 OFF**
Shown when dc ess bus 1 off is detected by the monitored system.
**DC ESS BUS 2 OFF**
Shown when dc ess bus 2 off is detected by the monitored system.
**DC ESS BUS 3 OFF**
Shown when dc ess bus 3 off is detected by the monitored system.
**GPU CONNECTED**
Shown when external GPU power is connected to the aircraft.
**IDG 1 OFF BUS**
Shown when idg 1 off bus is detected by the monitored system.
**IDG 1 OIL**
Shown when the simulator detects: idg 1 oil.
**IDG 2 OFF BUS**
Shown when idg 2 off bus is detected by the monitored system.
**IDG 2 OIL**
Shown when the simulator detects: idg 2 oil.
**TRU 1 FAIL**
Shown when tru 1 fail is detected.
**TRU 2 FAIL**
Shown when tru 2 fail is detected.
**TRU ESS FAIL**
Shown when tru ess fail is detected.
Engines & takeoff dataset (6)
**ENG 1 OIL LO LEVEL**
Shown when engine oil quantity is below about 2 quarts.
**ENG 2 OIL LO LEVEL**
Shown when engine oil quantity is below about 2 quarts.
**ENG NO TAKEOFF DATA**
Caution on the ground when takeoff data is incomplete or inconsistent: V-speeds, flap setting, thrust rating, temperature, flex data, or FADEC/MCDU dataset agreement. Suppressed during takeoff (80 kt to 400 ft AGL) and for 120 s after landing. Also suppressed when flaps are up.
**ENG REF A-I DISAG**
Caution when REF A/I in the T/O DATASET MENU does not match the overhead ice protection configuration (OFF, ENG, or ALL) while below 1,700 ft RA and not in landing mode. Clears above 1,700 ft RA or 120 s after takeoff.
**ENG REF ECS DISAG**
Caution when REF ECS in the MCDU T/O DATASET MENU (TRS → TO DATASET) does not match the actual bleed configuration used for FADEC takeoff N1. The MCDU setting is ON or OFF; the aircraft is treated as ECS ON only when both packs are on, both engine bleeds are open, no APU bleed is supplying the manifold, and Pack 1 is not held off by the emergency ram air valve built-in test. Active below 1,700 ft radio altitude, not in landing mode, with both engines running. Clears when the mismatch ends or 120 s after takeoff.
First flight of the day (ERAV BIT): on the first engine start of each UTC flight day the emergency ram air valve runs a \~90 s built-in test and holds Pack 1 off. With REF ECS ON, this caution can appear until the test completes. Spawn in turnaround mode in EFB Settings → Aircraft skips the ERAV BIT on that spawn.
Engines on + APU bleed on: with both engines running and APU bleed open, bleed air comes from the APU (FADEC ECS OFF) even if packs stay on. REF ECS ON then disagrees. Close APU bleed or set REF ECS OFF. REF ECS does not command the packs; it is the takeoff N1 assumption. See AIR COND / PNEUMATIC and SYSTEMS/ECS (MFD).
**ENG TLA NOT TOGA**
Caution when thrust levers are not in the TOGA detent by 60 kt during takeoff.
Air conditioning & pressurization (1)
**CABIN DIFF PRESS FAIL**
Caution when cabin differential pressure exceeds the CPCS limit.
APU (3)
**APU ALTITUDE EXCEED**
Shown when the simulator detects: apu altitude exceed.
**APU FAULT**
Shown when apu fault is detected.
**APU GEN OFF BUS**
Shown when apu gen off bus is detected by the monitored system.
Fuel (1)
**FUEL IMBALANCE**
Caution when fuel quantity imbalance between wing tanks exceeds the monitored limit.
Hydraulics (3)
**HYD 1 LO PRESS**
Shown for low hydraulic pressure or quantity in the indicated system.
**HYD 2 LO PRESS**
Shown for low hydraulic pressure or quantity in the indicated system.
**HYD 3 LO PRESS**
Shown for low hydraulic pressure or quantity in the indicated system.
Ice & rain protection (1)
**A-I LO CAPACITY**
Shown for anti-ice valve or mode: a-i lo capacity.
Flight controls & autoflight (1)
**FLT CTRL BIT EXPIRED**
Caution when the flight control built-in test has expired; cycle power to reset.
Flight instruments & surveillance (1)
**XPDR 1 IN STBY**
Shown when the simulator detects: xpdr 1 in stby.
{% endtab %}
{% tab title="Advisories" %}
Air conditioning & pressurization (6)
**BLEED 1 OFF**
Shown when bleed 1 off is detected by the monitored system.
**BLEED 2 OFF**
Shown when bleed 2 off is detected by the monitored system.
**LAND FIELD ELEV**
Advisory when the landing field elevation entered in pressurization does not match the destination elevation in the FMS.
**PACK 1 OFF**
Shown when pack 1 off is detected by the monitored system.
**PACK 2 OFF**
Shown when pack 2 off is detected by the monitored system.
**XBLEED SW OFF**
Shown when xbleed sw off is detected by the monitored system.
Fuel (1)
**FUEL EQUAL XFEED OPEN**
Shown when the simulator detects: fuel equal xfeed open.
Hydraulics (6)
**HYD 1 LO QTY**
Shown for low hydraulic pressure or quantity in the indicated system.
**HYD 2 LO QTY**
Shown for low hydraulic pressure or quantity in the indicated system.
**HYD 3 LO QTY**
Shown for low hydraulic pressure or quantity in the indicated system.
**HYD 3 PUMP A NOT ON**
Shown when hyd 3 pump a not on.
**HYD PTU NOT AUTO**
Shown when hyd ptu not auto.
**HYD PUMP NOT AUTO**
Shown when hyd pump not auto.
Ice & rain protection (4)
**A-I MODE NOT AUTO**
Shown when a-i mode not auto.
**A-I SWITCH OFF**
Shown when a-i switch off is detected by the monitored system.
**ICE CONDITION**
Shown for ice protection: ice condition.
**STALL PROT ICE SPEED**
Shown for ice protection: stall prot ice speed.
Flight controls & autoflight (4)
**SHAKER 1 FAIL**
Shown when shaker 1 fail is detected.
**SHAKER 2 FAIL**
Shown when shaker 2 fail is detected.
**SPDBRK LEVER DISAG**
Advisory when the speedbrake lever position disagrees with the commanded speedbrake surface position.
**YD OFF**
Shown when yd off is detected by the monitored system.
Landing gear & brakes (2)
**BRK LH FAULT**
Shown when brk lh fault is detected.
**BRK RH FAULT**
Shown when brk rh fault is detected.
Flight instruments & surveillance (1)
**IRS ALIGNING**
Advisory while the IRS is aligning after power-up.
Oxygen (1)
**PAX OXY SW NOT AUTO**
Shown when pax oxy sw not auto.
{% endtab %}
{% tab title="Status" %}
Engines & takeoff dataset (4)
**ENG 1 TLA NOT IDLE**
Status when engine 1 start or shutdown is attempted while the left thrust lever is not at idle.
**ENG 2 TLA NOT IDLE**
Status when engine 2 start or shutdown is attempted while the right thrust lever is not at idle.
**ENG TDS REF A-I ALL**
Status reminder that REF A/I in the takeoff dataset is ALL (wing and nacelle anti-ice).
**ENG TDS REF A-I ENG**
Status reminder that REF A/I in the takeoff dataset is ENG (nacelle anti-ice only).
Air conditioning & pressurization (1)
**BLEED APU VLV OPEN**
Status when the APU is running, APU bleed is selected on the overhead, and the APU bleed valve is open.
APU (1)
**APU SHUTTING DOWN**
Shown when the simulator detects: apu shutting down.
Hydraulics (2)
**HYD 1 SOV CLOSED**
Shown when the simulator detects: hyd 1 sov closed.
**HYD 2 SOV CLOSED**
Shown when the simulator detects: hyd 2 sov closed.
Ice & rain protection (3)
**A-I ENG 1 VLV OPEN**
Shown for anti-ice valve or mode: a-i eng 1 vlv open.
**A-I ENG 2 VLV OPEN**
Shown for anti-ice valve or mode: a-i eng 2 vlv open.
**A-I WING VLV OPEN**
Shown for anti-ice valve or mode: a-i wing vlv open.
Flight controls & autoflight (1)
**FLT CTRL TEST IN PROG**
Status while the flight control built-in test is running (about three minutes).
Landing gear & brakes (1)
**STEER OFF**
Shown when steer off is detected by the monitored system.
{% endtab %}
{% endtabs %}