Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Procedure; Human Factors
I swapped into this aircraft and I tested the oxygen mask in accordance with the Canadair SOPM; and coincident with actuation of the TEST/RESET lever the  CREW OXY LO PRESS caution message posted. The message disappeared when I released the TEST/RESET lever. Since the gauge indicated approximately 1500 psi; I contacted Line Maintenance to resolve this discrepancy. Line Maintenance discovered that the crew oxygen shut-off valve was in the closed position; meaning that no oxygen was  available to the crew masks. The valve was opened and we were returned to service.Failure of maintenance up-line to open the crew oxygen shut-off valve. Maintenance: Verify task completion. Flight Operations: Revise the Canadair Standard Operating Procedures Manual; to include verifying that the CREW OXY LO PRESS caution message is not presented during the oxygen mask test. Coincident with issuance of the temporary revision; issue a Flight Operations Alert Bulletin for pilot awareness.
CRJ-200 Captain reported discovering during preflight that the crew oxygen supply was turned off at the bottle.