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A DC9-30 on descent at 12000 ft declared an emergency due to #1 engine loss of oil pressure and quantity caused by a bolt backing out of an oil system component.
| Attributes | |
| ACN | 434414 |
| Time | |
| Date | 199904 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : cri.vor |
| State Reference | MI |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d21.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : mizar arrival |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 2000 |
| ASRS Report | 434414 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 12500 flight time type : 10000 |
| ASRS Report | 434087 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : engine indications other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed in emergency condition flight crew : declared emergency |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During descent at 12000 ft on mizar arrival to dtw from atl, left engine oil pressure began fluctuating between 35-40 psi, oil quantity dropped to zero, then pressure to below 20 psi. Cockpit operating manual procedures were followed with precautionary shutdown. Emergency was declared. Single engine approach and landing was uneventful. Emergency canceled after clearing runway 21R at dtw. Callback conversation with reporter revealed the following information: the reporter stated the aircraft had 2 P&west JT8D-9 engines and the loss of oil was due to a bolt backing out of an oil system component. The reporter said that when the aircraft was on the ground and maintenance opened the engine the reporter went back to see what had failed. The reporter stated maintenance pointed out a bolt that backed out of an oil system component resulting in the oil loss. The reporter said maintenance named the component involved but does not remember the name or its function.
Original NASA ASRS Text
Title: A DC9-30 ON DSCNT AT 12000 FT DECLARED AN EMER DUE TO #1 ENG LOSS OF OIL PRESSURE AND QUANTITY CAUSED BY A BOLT BACKING OUT OF AN OIL SYS COMPONENT.
Narrative: DURING DSCNT AT 12000 FT ON MIZAR ARR TO DTW FROM ATL, L ENG OIL PRESSURE BEGAN FLUCTUATING BTWN 35-40 PSI, OIL QUANTITY DROPPED TO ZERO, THEN PRESSURE TO BELOW 20 PSI. COCKPIT OPERATING MANUAL PROCS WERE FOLLOWED WITH PRECAUTIONARY SHUTDOWN. EMER WAS DECLARED. SINGLE ENG APCH AND LNDG WAS UNEVENTFUL. EMER CANCELED AFTER CLRING RWY 21R AT DTW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT HAD 2 P&W JT8D-9 ENGS AND THE LOSS OF OIL WAS DUE TO A BOLT BACKING OUT OF AN OIL SYS COMPONENT. THE RPTR SAID THAT WHEN THE ACFT WAS ON THE GND AND MAINT OPENED THE ENG THE RPTR WENT BACK TO SEE WHAT HAD FAILED. THE RPTR STATED MAINT POINTED OUT A BOLT THAT BACKED OUT OF AN OIL SYS COMPONENT RESULTING IN THE OIL LOSS. THE RPTR SAID MAINT NAMED THE COMPONENT INVOLVED BUT DOES NOT REMEMBER THE NAME OR ITS FUNCTION.
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.