EICAS STATUS MESSAGES
None
PLACARD
As appropriate.
MAINTENANCE (M)
NOTE: Bottle charge can be verified two ways: electrically per step 1) or by weighing the bottle per step 2). If the electrical check passes, the airplane may be dispatched. If the electrical check fails, the failure may be in the pressure switch, and the system may still be acceptable for dispatch if the bottle
charge is verified by weighing. Operators can, if desired, bypass the electrical check and just perform the bottle weighing procedure.
1. Check that pressure switch operates normally and that bottle is charged:
NOTE: Perform the following procedure for the bottle associated with the inoperative pressure indicating system.
A. Disconnect electrical connector from pressure switch at bottle with inoperative light circuit.
B. Connect ohmmeter between pin sockets 2 and 3 of bottle receptacle.
1) Check for open circuit indication. Open circuit indicates pressurized bottle.
2) Press test switch on end of pressure switch or turn hex key 1/4 turn counterclockwise and check for closed circuit indication.
3) Release test switch or hex key and check for open circuit indication.
C. Reconnect electrical connector to bottle receptacle.
2. Optional Bottle Weighing Procedure:
A. Remove the bottle per the following Maintenance Manual Procedure:
CARGO: AMM 26-23-02
B. Weigh bottle and compare to the service weight stamped on the fire bottle side (+ 0.1 pound).
C. Replace serviceable bottle per the Maintenance Manual.
D. Cap and stow the affected bottle’s Pressure Switch Connector.
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