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MD11 flight crew encounters icing conditions during approach to landing. All anti-icing and deicing system activated. Engine 'vibration indicator' showed excessive vibration indicating possible ice ingestion.
| Attributes | |
| ACN | 689047 |
| Time | |
| Date | 200602 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : anc.airport |
| State Reference | AK |
| Altitude | msl bound lower : 0 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Ice Snow |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 800 |
| ASRS Report | 689047 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : weather inflight encounter other other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor Aircraft |
| Primary Problem | Environmental Factor |
Narrative:
All preflight WX indicated destination and alternate would be well above minimums at arrival approach was CAT 1 ILS runway 7L. Ignition override; engine and airframe anti-icing system all turned on passing 10000 ft MSL. Entered clouds at 5000 ft MSL. Upon entering clouds #1 and #3 engine vibration indicators began to display amber intermittently. Engine RPM was increased as we suspected fan blade icing. First approach was terminated due to aircraft on runway and directed by ATC. After vectors around the pattern at 2000 ft MSL; attempted another ILS runway 7L and successfully landed. Runway was snowy; but plowed. Captain wrote up possible ice ingestion upon landing. Notified by company all 3 engines sustained ice damage.
Original NASA ASRS Text
Title: MD11 FLT CREW ENCOUNTERS ICING CONDITIONS DURING APCH TO LNDG. ALL ANTI-ICING AND DEICING SYS ACTIVATED. ENG 'VIBRATION INDICATOR' SHOWED EXCESSIVE VIBRATION INDICATING POSSIBLE ICE INGESTION.
Narrative: ALL PREFLT WX INDICATED DEST AND ALTERNATE WOULD BE WELL ABOVE MINIMUMS AT ARR APCH WAS CAT 1 ILS RWY 7L. IGNITION OVERRIDE; ENG AND AIRFRAME ANTI-ICING SYS ALL TURNED ON PASSING 10000 FT MSL. ENTERED CLOUDS AT 5000 FT MSL. UPON ENTERING CLOUDS #1 AND #3 ENG VIBRATION INDICATORS BEGAN TO DISPLAY AMBER INTERMITTENTLY. ENG RPM WAS INCREASED AS WE SUSPECTED FAN BLADE ICING. FIRST APCH WAS TERMINATED DUE TO ACFT ON RWY AND DIRECTED BY ATC. AFTER VECTORS AROUND THE PATTERN AT 2000 FT MSL; ATTEMPTED ANOTHER ILS RWY 7L AND SUCCESSFULLY LANDED. RWY WAS SNOWY; BUT PLOWED. CAPT WROTE UP POSSIBLE ICE INGESTION UPON LNDG. NOTIFIED BY COMPANY ALL 3 ENGS SUSTAINED ICE DAMAGE.
Data retrieved from NASA's ASRS site as of January 2009 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.