Regional Jet 200 ER/LR (CRJ200)
Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Training / Qualification; Confusion; Troubleshooting; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Chart Or Publication; Human Factors; MEL; Manuals
I opened an MEL 73-31-3 for a Fuel Pressure Indication System. I thought that the switch was at fault based on the Fault Isolation Manual (FIM) task for the 'FUEL LO PRESS' caution message. My Supervisor informed me today that the Standy Fuel Check Valve could also cause the problem. My Supervisor informed me that we need to do more troubleshooting to find root cause of problem. Based on the information that I had at the time; I believed that the pressure switch was reading incorrectly. We scheduled Maintenance to look at problem. [Recommend] creating a flow chart for this particular message.
A Maintenance Controller reports he deferred a fuel pressure switch on a CRJ-200 aircraft based on their Fault Isolation Manual (FIM) procedures for a 'FUEL LO PRESS' caution message. He was later informed that a Standby Fuel Check Valve could have been the problem and the importance of better troubleshooting to find root causes.