EMB145 returned to departure station with #1 hydraulic problems.

Attributes
ACN	568220
Time
Date	200212
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zob.artcc
Altitude	msl single value : 16000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 2100 flight time type : 900
ASRS Report	568220
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : hyd qty indication other flight crewa
Resolutory Action	flight crew : landed in emergency condition flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

10-15 mins after departure, received indication 'hydraulic #1 low quantity.' decided to continue and have svced in sbn. 5 mins later, total failure of system #1 hydraulics. Captain and I decided to return while troubleshooting. We referenced the emergency procedures handbook and closely followed the checklist. We were able to bring the #1 system (hydraulic) back up, temporarily. 5 mins later, it failed again. At this point, we declared an emergency. The #2 hydraulic system was functioning normally. We landed with new calculated performance uneventfully. Maintenance met our aircraft. We deplaned passenger onto a bus and were towed back to the gate.

Original NASA ASRS Text

Title: EMB145 RETURNED TO DEP STATION WITH #1 HYD PROBS.

Narrative: 10-15 MINS AFTER DEP, RECEIVED INDICATION 'HYD #1 LOW QUANTITY.' DECIDED TO CONTINUE AND HAVE SVCED IN SBN. 5 MINS LATER, TOTAL FAILURE OF SYS #1 HYDS. CAPT AND I DECIDED TO RETURN WHILE TROUBLESHOOTING. WE REFED THE EMER PROCS HANDBOOK AND CLOSELY FOLLOWED THE CHKLIST. WE WERE ABLE TO BRING THE #1 SYS (HYD) BACK UP, TEMPORARILY. 5 MINS LATER, IT FAILED AGAIN. AT THIS POINT, WE DECLARED AN EMER. THE #2 HYD SYS WAS FUNCTIONING NORMALLY. WE LANDED WITH NEW CALCULATED PERFORMANCE UNEVENTFULLY. MAINT MET OUR ACFT. WE DEPLANED PAX ONTO A BUS AND WERE TOWED BACK TO THE GATE.

Data retrieved from NASA's ASRS site as of July 2007 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.