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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An MD11 on approach at 8000 ft with engine N1 indications below 35%, throttles came forward with no engine response. Engines did not flame out.
| Attributes | |
| ACN | 617814 |
| Time | |
| Date | 200405 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : anc.tower tower : msy.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| 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 : 11895 flight time type : 350 |
| ASRS Report | 617814 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : engine n1 indicators other flight crewa other flight crewb |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : declared emergency flight crew : regained aircraft control flight crew : overrode automation |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Chart Or Publication Aircraft |
| Primary Problem | Aircraft |
Narrative:
At 8000 ft, throttles came forward, no engine response. N1 below 35%, all 3 engines. Oil pressure below 22 on #2, #1 and #3 oil pressure below 19 psi. Turned on engine ignition and all 3 engines came back to life. FMC showed engine out prompt and ead indications displayed mct. Declared an emergency and landed normally. Callback conversation with reporter revealed the following information: the reporter stated the engines never flamed out. The reporter said the throttles went forward as commanded by the FMS and it appeared as a longer than normal delay for engine acceleration. The reporter stated the normal limit that crews expect is no more than 8 seconds. The reporter said it was later discovered the FMS is programmed for 9.1 seconds to accelerate. The reporter stated while we are only talking seconds that 1.1 second delay seemed like 60 mins. The reporter said the company is sending out a bulletin to advise the flight crews of this conflict in time.
Original NASA ASRS Text
Title: AN MD11 ON APCH AT 8000 FT WITH ENG N1 INDICATIONS BELOW 35%, THROTTLES CAME FORWARD WITH NO ENG RESPONSE. ENGS DID NOT FLAME OUT.
Narrative: AT 8000 FT, THROTTLES CAME FORWARD, NO ENG RESPONSE. N1 BELOW 35%, ALL 3 ENGS. OIL PRESSURE BELOW 22 ON #2, #1 AND #3 OIL PRESSURE BELOW 19 PSI. TURNED ON ENG IGNITION AND ALL 3 ENGS CAME BACK TO LIFE. FMC SHOWED ENG OUT PROMPT AND EAD INDICATIONS DISPLAYED MCT. DECLARED AN EMER AND LANDED NORMALLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENGS NEVER FLAMED OUT. THE RPTR SAID THE THROTTLES WENT FORWARD AS COMMANDED BY THE FMS AND IT APPEARED AS A LONGER THAN NORMAL DELAY FOR ENG ACCELERATION. THE RPTR STATED THE NORMAL LIMIT THAT CREWS EXPECT IS NO MORE THAN 8 SECONDS. THE RPTR SAID IT WAS LATER DISCOVERED THE FMS IS PROGRAMMED FOR 9.1 SECONDS TO ACCELERATE. THE RPTR STATED WHILE WE ARE ONLY TALKING SECONDS THAT 1.1 SECOND DELAY SEEMED LIKE 60 MINS. THE RPTR SAID THE COMPANY IS SENDING OUT A BULLETIN TO ADVISE THE FLT CREWS OF THIS CONFLICT IN TIME.
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.