Narrative:

40 mi out of tvl on oct/xa/99. We received a single chime, master caution 'hydraulic' light on our cap panel. This alerted us to look up and identify the problem. The green hydraulic system 'low level' light was illuminated. The green system controls the landing gear and normal brakes. We followed the QRH procedures for the 'low level' checklist. The first officer was flying, so I briefed him on the situation. I told him that I was going to contact dispatch and maintenance control and give them the heads up. I told him to call ZMP and have them call tvl and have the crash fire rescue equipment standing by. No emergency declaration was made. I then told him that I was off radio #1, ZMP, and would be on #2 radio with company. I discussed the options with company and decided to proceed to tvl with sufficient runway available as determined by the QRH procedures. I told dispatch to call the contract maintenance to get them going. I reported back on with the first officer and advised him what company said, and he advised me of our flight conditions. We were cleared for the visual approach and we manually extended the gear. We landed without event and slowed using reverse and the emergency brake. We proceeded clear of the runway, and crash fire rescue equipment followed us to the gate area which was slightly modified for our arrival given our situation. Upon postflt inspection, we noticed the hydraulic reservoir needed servicing as it was below the refill line. It appeared that upon parking brake setting, the remainder of the fluid had leaked onto the tarmac. No further events noted. Due to the quickness of the situation, neither the first officer nor I had declared an emergency, even though we had crash fire rescue equipment standing by. Maintenance tightened a loose nut and svced the fluid and we were on our way back to ord.

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Original NASA ASRS Text

Title: AT 42 CREW HAD GREEN SYS HYD FAILURE.

Narrative: 40 MI OUT OF TVL ON OCT/XA/99. WE RECEIVED A SINGLE CHIME, MASTER CAUTION 'HYD' LIGHT ON OUR CAP PANEL. THIS ALERTED US TO LOOK UP AND IDENT THE PROB. THE GREEN HYD SYS 'LOW LEVEL' LIGHT WAS ILLUMINATED. THE GREEN SYS CTLS THE LNDG GEAR AND NORMAL BRAKES. WE FOLLOWED THE QRH PROCS FOR THE 'LOW LEVEL' CHKLIST. THE FO WAS FLYING, SO I BRIEFED HIM ON THE SIT. I TOLD HIM THAT I WAS GOING TO CONTACT DISPATCH AND MAINT CTL AND GIVE THEM THE HEADS UP. I TOLD HIM TO CALL ZMP AND HAVE THEM CALL TVL AND HAVE THE CFR STANDING BY. NO EMER DECLARATION WAS MADE. I THEN TOLD HIM THAT I WAS OFF RADIO #1, ZMP, AND WOULD BE ON #2 RADIO WITH COMPANY. I DISCUSSED THE OPTIONS WITH COMPANY AND DECIDED TO PROCEED TO TVL WITH SUFFICIENT RWY AVAILABLE AS DETERMINED BY THE QRH PROCS. I TOLD DISPATCH TO CALL THE CONTRACT MAINT TO GET THEM GOING. I RPTED BACK ON WITH THE FO AND ADVISED HIM WHAT COMPANY SAID, AND HE ADVISED ME OF OUR FLT CONDITIONS. WE WERE CLRED FOR THE VISUAL APCH AND WE MANUALLY EXTENDED THE GEAR. WE LANDED WITHOUT EVENT AND SLOWED USING REVERSE AND THE EMER BRAKE. WE PROCEEDED CLR OF THE RWY, AND CFR FOLLOWED US TO THE GATE AREA WHICH WAS SLIGHTLY MODIFIED FOR OUR ARR GIVEN OUR SIT. UPON POSTFLT INSPECTION, WE NOTICED THE HYD RESERVOIR NEEDED SVCING AS IT WAS BELOW THE REFILL LINE. IT APPEARED THAT UPON PARKING BRAKE SETTING, THE REMAINDER OF THE FLUID HAD LEAKED ONTO THE TARMAC. NO FURTHER EVENTS NOTED. DUE TO THE QUICKNESS OF THE SIT, NEITHER THE FO NOR I HAD DECLARED AN EMER, EVEN THOUGH WE HAD CFR STANDING BY. MAINT TIGHTENED A LOOSE NUT AND SVCED THE FLUID AND WE WERE ON OUR WAY BACK TO ORD.

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.