Commuter aircraft has hydraulic warning light activate during initial climb.

Attributes
ACN	300425
Time
Date	199503
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	arrival other departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 4700 flight time type : 275
ASRS Report	300425
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After takeoff from mia upon initial climb out the master caution (yellow light) came on. The first officer who was PNF idented the caution light as a hydraulic blue pump low pressure. After identify I directed the first officer to complete the normal checklist and then to complete the proper checklist for the hydraulic blue pump low pressure. While the first officer attended to his duties I (PF and the captain) continued to fly the aircraft and communicate with ATC. I made the decision to return to mia international airport. We were vectored back around for an ILS to runway 9R and landed uneventfully. The WX was approximately 1500-1800 ft broken to overcast, visibility between 5-6 mi and it was at night. The problem was written up in the logbook prior to me accepting the aircraft. The maintenance people had ground checked the aircraft and could not duplicate the problem and cleared it. When I took the aircraft I checked the log and saw the writeup and that it was cleared. So I accepted the aircraft. The problem then reoccurred. Crew interaction and cockpit resource management ran smoothly and all checklists and procedures were complied with.

Original NASA ASRS Text

Title: COMMUTER ACFT HAS HYD WARNING LIGHT ACTIVATE DURING INITIAL CLB.

Narrative: AFTER TKOF FROM MIA UPON INITIAL CLB OUT THE MASTER CAUTION (YELLOW LIGHT) CAME ON. THE FO WHO WAS PNF IDENTED THE CAUTION LIGHT AS A HYD BLUE PUMP LOW PRESSURE. AFTER IDENT I DIRECTED THE FO TO COMPLETE THE NORMAL CHKLIST AND THEN TO COMPLETE THE PROPER CHKLIST FOR THE HYD BLUE PUMP LOW PRESSURE. WHILE THE FO ATTENDED TO HIS DUTIES I (PF AND THE CAPT) CONTINUED TO FLY THE ACFT AND COMMUNICATE WITH ATC. I MADE THE DECISION TO RETURN TO MIA INTL ARPT. WE WERE VECTORED BACK AROUND FOR AN ILS TO RWY 9R AND LANDED UNEVENTFULLY. THE WX WAS APPROX 1500-1800 FT BROKEN TO OVCST, VISIBILITY BTWN 5-6 MI AND IT WAS AT NIGHT. THE PROB WAS WRITTEN UP IN THE LOGBOOK PRIOR TO ME ACCEPTING THE ACFT. THE MAINT PEOPLE HAD GND CHKED THE ACFT AND COULD NOT DUPLICATE THE PROB AND CLRED IT. WHEN I TOOK THE ACFT I CHKED THE LOG AND SAW THE WRITEUP AND THAT IT WAS CLRED. SO I ACCEPTED THE ACFT. THE PROB THEN REOCCURRED. CREW INTERACTION AND COCKPIT RESOURCE MGMNT RAN SMOOTHLY AND ALL CHKLISTS AND PROCS WERE COMPLIED WITH.

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.