A crj-200 with deferred system one quantity indicator had low pressure in hydraulic system one in cr...

Narrative:

The aircraft had an MEL deferring the hydraulic system one quantity indicators. We complied with the operational procedures with the MEL and I verified the quantity when I did my preflight. While in cruise we received a hydraulic 1 low pressure caution message. The pilot flying took over the radios and I complied with the QRH. The 1A pump was putting out 0 psi and; with the 1B pump operational; the pressure would fluctuate between 800-1;400 psi. As per the QRH we needed to land at nearest suitable airport. The pilot flying transferred flight controls and radios to me and I became the pilot flying. He received all appropriate weather and NOTAMS while I communicated with approach and flew the airplane to get in a position to land. No emergency was declared; however [tower] had rolled the fire trucks. The landing was made. It was uneventful and once deplaned we contacted maintenance. The threat was allowing the aircraft to operate under that MEL because once we were in flight we did not know the actual quantity in flight while running the QRH.

Original NASA ASRS Text

Title: A CRJ-200 with deferred system one quantity indicator had low pressure in hydraulic system one in cruise flight. Aircraft continued to destination where a normal landing was made with equipment standing by.

Narrative: The aircraft had an MEL deferring the hydraulic system one quantity indicators. We complied with the operational procedures with the MEL and I verified the quantity when I did my preflight. While in cruise we received a HYD 1 LOW PRESSURE caution message. The pilot flying took over the radios and I complied with the QRH. The 1A pump was putting out 0 PSI and; with the 1B pump operational; the pressure would fluctuate between 800-1;400 PSI. As per the QRH we needed to land at nearest suitable airport. The pilot flying transferred flight controls and radios to me and I became the pilot flying. He received all appropriate weather and NOTAMS while I communicated with Approach and flew the airplane to get in a position to land. No emergency was declared; however [Tower] had rolled the fire trucks. The landing was made. It was uneventful and once deplaned we contacted Maintenance. The threat was allowing the aircraft to operate under that MEL because once we were in flight we did not know the actual quantity in flight while running the QRH.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1032024
Time
Date	201208
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Hydraulic Main System
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Critical

A crj-200 with deferred system one quantity indicator had low pressure in hydraulic system one in cruise flight. Aircraft continued to destination where a normal landing was made with equipment standing by.