FIREX BTL 1 LOW
(Advisory)

The cyan 'FIREX BTL 1 LOW' advisory CAS message indicates the FIREX CU has sensed low pressure in the respective extinguishing bottle.

• Each bottle has a pressure alarm gauge, A "C" shaped bourdon tube operates a spring-loaded normally open internal switch. The switch closing pressure is 250 ±25 psig sending a ground to the FIREX CU to display low pressure indications on the EICAS and PBAs.
• The switch opening pressure is 450 psig max.

• None

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Interrogate the MDC as follows:

   1. On the cursor control panel, ensure the toggle switch is to the right and select Anti-Ice, ECS and Fuel buttons simultaneously. The MDC main menu should now be displayed on Display Unit #3.
   2. Using the joystick, select Current Faults (if the fault is active) or Aircraft History to research stored faults. From Aircraft History you can then select Fault Message History and locate the fault. Going into advanced diagnostics will provide an equation id for the fault identified.
   3. Select the MDC fault or equation from the drop down below to provide additional information to assist in troubleshooting.
      Select an MDC Fault Code/Message:B3-006747 - INTERNAL FAULT [FIREX CTRL UNIT]B3-008136 - LOW PRESSURE DETECTED [FIREX BOTTLE 1]