Date: 201507
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Light: Daylight
Aircraft: EMB ERJ 145 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Hydraulic System Lines; Connectors; Fittings
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; General Maintenance Action
Contributing factors: Aircraft; Procedure
Primary problem: Aircraft

Narrative: An EICAS Message; HYD 1 QTY LO indication during cruise alerted us to the HYD 1 pump leak ENG 1. We monitored the indications and advised Dispatch and Maintenance via ACARS. The HYD SYS 1 quantity dropped notably for the remainder of the fight. Looking thru the logbook revealed a recent history regarding the hydraulic pump and frequent servicing. A hydraulic fitting had been replaced the day before. After consideration the First Officer (FO) and I decided to continue on to destination. We advised ATC of the problem and asked for priority handling and short cuts to the airport. We were taken off the arrival in order to get priority handling and short cuts. With the HYD 1 SYS QTY extremely low and HYD SYS 1 failure imminent; we wanted to get to the airport as soon as possible; slow the aircraft down and get the gear down early to avoid any landing gear extension issues. We followed ATC instructions; HDG; ALT etc. to an ILS approach and landing. Ground crews followed us to the gate without incident. HYD SYS 1 leak; could have resulted in a HYD SYS 1 Failure; and subsequent manual gear extension procedures.


Second narrative: Hydraulic 1 Quantity low Indication on the EICAS appeared in cruise. Monitored Quantity for duration of flight. Quantity dropped notably for remainder of flight. Contacted Maintenance via ACARS as well as Dispatch and notified them of issue. Reviewed log book for history of Hydraulic Sys 1 service and maintenance record. Noted that engine driven pump fitting was replaced recently and service to system frequent within past few days. Conferred with Maintenance and Dispatch and pilot flying for decision to continue to destination airport while monitoring Hydraulic System 1 quantity.ATC was advised at that time that we would prefer a short cut to reduce distance to the airport and that there was not an emergency at that time; but priority would be appreciated if able; and they agreed. They then took us off the arrival for traffic; while on the heading off the arrival if we did not want to go to the back of the line of aircraft in trail. We complied; after discussing the options as we found our situation to be time critical due to the Hydraulic System 1 quantity level still reducing in value.We then accepted ATC headings to a normal downwind and landing. Emergency Services met us on the ground and followed us to the gate. In the future; Logbook trends should be noted with a higher scrutiny.


Synopsis: EMB145 flight crew experienced an EICAS message for Hydraulic 1 quantity low in cruise. The crew is able to land at destination before the system fails and taxi to the gate. Post flight revealed that the aircraft had a history of servicing the Number 1 Hydraulic system; with a fitting replaced.