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B737-700 crew felt vibrations and heard loud noises emanating from the number 2 engine.
| Attributes | |
| ACN | 1076554 |
| Time | |
| Date | 201303 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Turbine Engine |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 205 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 247 Flight Crew Type 7450 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Bird / Animal |
Narrative:
Hit a small bird at 100 KTS followed by a normal takeoff. After the gear was raised; at approximately 500 ft AGL; three rapid loud 'booms' were felt followed by three more rapid loud 'booms.' slight aircraft yaw was felt followed by normal flight. Engine instruments were checked and rechecked with no abnormal indications. An emergency was declared and a return to land was coordinated with ATC asking for the equipment to standby. Flight attendants were informed and told to 'secure' the cabin. The passengers were informed; and ops was informed and asked to call and inform dispatch. The decision was made to utilize the number 2 engine as normal since we had no adverse readings. Normal landing was made right at max landing weight (128;000 pounds) followed by clearing the runway and having the equipment take a look at the aircraft and the engine. No noticeable damage was observed and the aircraft was taxied back to the gate. The aircraft was taken out of service and the passengers re-accommodated. I gave my apologies to the passengers and asked what they observed. Several sitting on the first officer's side abeam the number 2 engine saw flames coming out of the front and rear of the engine during the 'booms.'preventative measures: not really sure. I'd like to know if the possibility of having too much glycol (oil based) sprayed into the engines during the overnight deice could have been a contributing factor. Suspected compressor stalls.
Original NASA ASRS Text
Title: B737-700 crew felt vibrations and heard loud noises emanating from the Number 2 Engine.
Narrative: Hit a small bird at 100 KTS followed by a normal takeoff. After the gear was raised; at approximately 500 FT AGL; three rapid loud 'booms' were felt followed by three more rapid loud 'booms.' Slight aircraft yaw was felt followed by normal flight. Engine instruments were checked and rechecked with NO abnormal indications. An emergency was declared and a return to land was coordinated with ATC asking for the equipment to standby. Flight attendants were informed and told to 'secure' the cabin. The passengers were informed; and Ops was informed and asked to call and inform Dispatch. The decision was made to utilize the Number 2 Engine as normal since we had no adverse readings. Normal landing was made right at max landing weight (128;000 LBS) followed by clearing the runway and having the equipment take a look at the aircraft and the engine. No noticeable damage was observed and the aircraft was taxied back to the gate. The aircraft was taken out of service and the passengers re-accommodated. I gave my apologies to the passengers and asked what they observed. Several sitting on the First Officer's side abeam the Number 2 Engine saw flames coming out of the front and rear of the engine during the 'booms.'Preventative Measures: Not really sure. I'd like to know if the possibility of having too much Glycol (oil based) sprayed into the engines during the overnight deice could have been a contributing factor. Suspected compressor stalls.
Data retrieved from NASA's ASRS site as of July 2013 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.