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Air carrier large transport in-flight fire warning shortly after takeoff from den. Reduced thrust caused fire warning to extinguish. Return land with engine operating at reduced thrust to keep hydraulic/gen working.
| Attributes | |
| ACN | 191905 |
| Time | |
| Date | 199110 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 7500 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : den |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : initial climbout : takeoff climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 300 |
| ASRS Report | 191905 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Airport |
Narrative:
On takeoff after 3 mins a fire warning on #1 engine illuminated. After retarding throttle to idle fire indication extinguished. Thought there may be a bleed leak on the engine. Maintenance found several hot air bleed leaks due to the wrong clamps being installed allowing leaks of hot air to contact the fire warning wiring causing the fire illumination. Mechanic found the associated clamps on engine #3 to be the wrong clamps also. Found insufficient information in maintenance books to determine which clamps to use. Suspect whole fleet of large transport may potentially have hot air leaks causing engine fire indications. We returned to den and completed an uneventful landing. We shut down the affected engine after clearing the runway. Crew elected not to shut down engine while returning to land to keep aircraft systems (ie, hydraulic/generators) operating.
Original NASA ASRS Text
Title: ACR LGT INFLT FIRE WARNING SHORTLY AFTER TKOF FROM DEN. REDUCED THRUST CAUSED FIRE WARNING TO EXTINGUISH. RETURN LAND WITH ENG OPERATING AT REDUCED THRUST TO KEEP HYD/GEN WORKING.
Narrative: ON TKOF AFTER 3 MINS A FIRE WARNING ON #1 ENG ILLUMINATED. AFTER RETARDING THROTTLE TO IDLE FIRE INDICATION EXTINGUISHED. THOUGHT THERE MAY BE A BLEED LEAK ON THE ENG. MAINT FOUND SEVERAL HOT AIR BLEED LEAKS DUE TO THE WRONG CLAMPS BEING INSTALLED ALLOWING LEAKS OF HOT AIR TO CONTACT THE FIRE WARNING WIRING CAUSING THE FIRE ILLUMINATION. MECH FOUND THE ASSOCIATED CLAMPS ON ENG #3 TO BE THE WRONG CLAMPS ALSO. FOUND INSUFFICIENT INFO IN MAINT BOOKS TO DETERMINE WHICH CLAMPS TO USE. SUSPECT WHOLE FLEET OF LGT MAY POTENTIALLY HAVE HOT AIR LEAKS CAUSING ENG FIRE INDICATIONS. WE RETURNED TO DEN AND COMPLETED AN UNEVENTFUL LNDG. WE SHUT DOWN THE AFFECTED ENG AFTER CLRING THE RWY. CREW ELECTED NOT TO SHUT DOWN ENG WHILE RETURNING TO LAND TO KEEP ACFT SYSTEMS (IE, HYD/GENERATORS) OPERATING.
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.