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Unusual sequence of events as checklists for loss of hydraulic fluid pressure was completed and no green gear lights observed when gear was extended.
| Attributes | |
| ACN | 125395 |
| Time | |
| Date | 198910 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : stl |
| State Reference | MO |
| Altitude | msl bound lower : 542 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc tracon : stl tower : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other landing other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7800 flight time type : 103 |
| ASRS Report | 125395 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 18000 |
| ASRS Report | 125397 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
About T:30 to :40 mins out of stl I noticed a loss of hydraulic system fluid on right side. Told captain and we executed the loss of hydraulic fluid and loss of one hydraulic system checklist. As we did this the hydraulic fluid returned to where it was on preflight. We then decided we had a hydraulic pressure loss because when we turned on the right pump we had no pressure. Now with quantity and no pressure we used the hydraulic pressure low checklist and when auxiliary pump was turned on we had 3000 psi and normal quantity. Descent and approach was initiated. Flap and slats were extended normally, but when gear was lowered we didn't get 3 green lights and had no other indication that the gear was not down and locked. A go-around was accomplished, flap up to 15 degree and attempted to raise gear. It didn't come up. Gear handle was placed down again. Captain then switched to company and I was flying the plane and talking to approach control. The tower was asked to confirm the gear was down. Approach asked if we wanted to go and hold. I asked the captain when he wasn't talking to company and he said no he was satisfied the gear was down and locked. All the way around normal 3000 psi and normal hydraulic quantity was indicated, normal approach and landing were made. After landing green gear light came on, taxied in and parked aircraft. Callback conversation with reporter revealed the following: reporter stated that he felt he would have gone out and held while he contacted maintenance for further troubleshooting techniques. He was concerned with the green gear lights not being illuminated. No explanation came fourth from maintenance after their inspection and gear retraction extension test. No fault was found.
Original NASA ASRS Text
Title: UNUSUAL SEQUENCE OF EVENTS AS CHECKLISTS FOR LOSS OF HYDRAULIC FLUID PRESSURE WAS COMPLETED AND NO GREEN GEAR LIGHTS OBSERVED WHEN GEAR WAS EXTENDED.
Narrative: ABOUT T:30 TO :40 MINS OUT OF STL I NOTICED A LOSS OF HYDRAULIC SYSTEM FLUID ON RIGHT SIDE. TOLD CAPT AND WE EXECUTED THE LOSS OF HYDRAULIC FLUID AND LOSS OF ONE HYDRAULIC SYSTEM CHECKLIST. AS WE DID THIS THE HYDRAULIC FLUID RETURNED TO WHERE IT WAS ON PREFLT. WE THEN DECIDED WE HAD A HYDRAULIC PRESSURE LOSS BECAUSE WHEN WE TURNED ON THE RIGHT PUMP WE HAD NO PRESSURE. NOW WITH QUANTITY AND NO PRESSURE WE USED THE HYDRAULIC PRESSURE LOW CHECKLIST AND WHEN AUX PUMP WAS TURNED ON WE HAD 3000 PSI AND NORMAL QUANTITY. DSCNT AND APCH WAS INITIATED. FLAP AND SLATS WERE EXTENDED NORMALLY, BUT WHEN GEAR WAS LOWERED WE DIDN'T GET 3 GREEN LIGHTS AND HAD NO OTHER INDICATION THAT THE GEAR WAS NOT DOWN AND LOCKED. A GO-AROUND WAS ACCOMPLISHED, FLAP UP TO 15 DEG AND ATTEMPTED TO RAISE GEAR. IT DIDN'T COME UP. GEAR HANDLE WAS PLACED DOWN AGAIN. CAPT THEN SWITCHED TO COMPANY AND I WAS FLYING THE PLANE AND TALKING TO APCH CTL. THE TWR WAS ASKED TO CONFIRM THE GEAR WAS DOWN. APCH ASKED IF WE WANTED TO GO AND HOLD. I ASKED THE CAPT WHEN HE WASN'T TALKING TO COMPANY AND HE SAID NO HE WAS SATISFIED THE GEAR WAS DOWN AND LOCKED. ALL THE WAY AROUND NORMAL 3000 PSI AND NORMAL HYDRAULIC QUANTITY WAS INDICATED, NORMAL APCH AND LNDG WERE MADE. AFTER LNDG GREEN GEAR LIGHT CAME ON, TAXIED IN AND PARKED ACFT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: REPORTER STATED THAT HE FELT HE WOULD HAVE GONE OUT AND HELD WHILE HE CONTACTED MAINT FOR FURTHER TROUBLESHOOTING TECHNIQUES. HE WAS CONCERNED WITH THE GREEN GEAR LIGHTS NOT BEING ILLUMINATED. NO EXPLANATION CAME FOURTH FROM MAINT AFTER THEIR INSPECTION AND GEAR RETRACTION EXTENSION TEST. NO FAULT WAS FOUND.
Data retrieved from NASA's ASRS site as of August 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.