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B737-300 flight crew encounters apparent ice build-up and eventual shedding somewhere in the rotating sections of the left engine.
| Attributes | |
| ACN | 816805 |
| Time | |
| Date | 200812 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 131 |
| ASRS Report | 816805 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 196 flight time type : 1300 |
| ASRS Report | 816804 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : engine vibration indicator other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : took precautionary avoidance action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Weather Aircraft |
| Primary Problem | Aircraft |
Narrative:
50 miles west of ZZZ at FL290; the ride was moderate chop and FL270 was requested and granted. We had been encountering light rime ice throughout the climb and cruise and the engine anti-ice was on. Power was set at 78% mach due to MEL 27-4 and within minutes the #1 vibration gauge began to climb. I increased power to 82% and 2 bangs were heard with a slight fluctuation in the N1. The vibration gauge returned to a 1/2 unit reading and all other indications remained normal. FL190 was requested and granted and we departed the icing conditions at FL210. The combination of MEL 27-4 speed restriction and the rapid onset of moderate icing from light icing following the altitude change contributed to the icing of the #1 engine in a very short period of time. Supplemental information from acn 816804: the power setting was 78% and mach was .65 due to our compliance with MEL 27-4. We landed and wrote up the jet. It was subsequently taken out of service.
Original NASA ASRS Text
Title: B737-300 flight crew encounters apparent ice build-up and eventual shedding somewhere in the rotating sections of the left engine.
Narrative: 50 miles west of ZZZ at FL290; the ride was moderate chop and FL270 was requested and granted. We had been encountering light rime ice throughout the climb and cruise and the engine anti-ice was on. Power was set at 78% Mach due to MEL 27-4 and within minutes the #1 vibration gauge began to climb. I increased power to 82% and 2 bangs were heard with a slight fluctuation in the N1. The vibration gauge returned to a 1/2 unit reading and all other indications remained normal. FL190 was requested and granted and we departed the icing conditions at FL210. The combination of MEL 27-4 speed restriction and the rapid onset of moderate icing from light icing following the altitude change contributed to the icing of the #1 engine in a very short period of time. Supplemental information from ACN 816804: The power setting was 78% and Mach was .65 due to our compliance with MEL 27-4. We landed and wrote up the jet. It was subsequently taken out of service.
Data retrieved from NASA's ASRS site as of May 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.