EMB-145 flight crew reported a low hydraulic quantity message and associated system engine hydraulic pump failure during descent to destination. Hydraulic system was still indicating pressurized and in consult with dispatch crew elected to return to departure airport where total system pressure failed when gear was extended for landing.
Synopsis
EMB-145 flight crew reported a low hydraulic quantity message and associated system engine hydraulic pump failure during descent to destination. Hydraulic system was still indicating pressurized and in consult with dispatch crew elected to return to departure airport where total system pressure failed when gear was extended for landing.
Narrative
Upon descending into ZZZ airport we presented with HYD 1 LOW QTY Advisory message. After a few minutes the E1 HYD PUMP FAIL advisory also presented itself. The hydraulic 1 system was noted as pressurized. Upon relaying this to dispatch it was requested to divert back to ZZZ1 airport for the longer runway and support staff; which we agreed upon. We stopped our descent at 11;000; prepped long range cruise; and started our diversion to ZZZ1 airport. We advised ATC and were given runway XXC. The QRH listed both advisory messages as crew awareness but we briefed on the consequences of losing HYD 1 in the event that we did have a complete failure. During long range cruise direct to ZZZ1 airport we observed the E1 HYD PUMP FAIL message disappear at one point and made note of it. The message returned about 5-10 minutes later. We both agreed it would be a precautionary landing. We ran numbers for a flaps 45 landing on runway XXC and dispatch relayed our unfactored landing distance to us via ACARS. When the gear was lowered; the HYD 1 system lost all pressure; but gear was extended successfully. HYD 1 FAIL; AIL SYS 1 FAIL; and RUDDER SYS 1 INOP presented at about 700 ft. We knew the consequences of these and continued for a successful landing. The aircraft was controlled on centerline with heavy braking applied by the CA and stopped short of the Taxiway 1 intersection. We coordinated with tower and ground crews for an aircraft inspection and when all was deemed clear we communicated with MX (Maintenance) personal and ground personal to bus the PAX (Passenger) to the terminal due to the APU being INOP and the tow team unwilling to tow with engines running.Suggestion: E1 HYD PUMP FAIL advisory message should not be crew awareness and should instead direct the QRH reader to the HYD SYS 1 FAIL checklist in the QRH or suggest LAND at nearest suitable.
Second reporter narrative
We were descending into ZZZ airport when we got the E1 low quantity message and after a couple of minutes; we got the E1 HYD PUMP FAIL EICAS message. I messaged dispatch and they asked us to divert back to ZZZ1 airport. We stopped our descent at 11;000 ft and pulled power back to long range cruise to conserve fuel. We advised ATC and was given runway XXC to land into ZZZ1 airport. We opted to land flaps 45 just in case we lost hydraulic system 1 completely. After we dropped the gear (normal operation) our pressure decreased and about 700 ft; we got the HYD SYS 1 FAIL eicas message. After we landed; we came to a complete stop and coordinated with tower and ground crew to asses the gear and buss the people to the terminal since we had the APU MELed and couldn't tow with both engines running. I have attached pics of the EICAS and MFD (Multi-Fuction Flight Display) HYD page to the bottom to show what we got once we were stopped on the runway.After the event; I forgot to write in the maintenance log book about the hydraulic system 1 failure. Dispatch called me and asked about it and I was transferred to maintenance control to put in the log book what had happened.Suggestion: As soon as you see both of those EICAS messages; start the diversion to the longest runway you can get to. Slow down and remember what needs to be completed prior to stepping off the aircraft.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.