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B737 flight crew reported airframe oscillations at similar airspeeds and configurations on multiple occasions.
| Attributes | |
| ACN | 1699204 |
| Time | |
| Date | 201911 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 170 Flight Crew Total 3549 Flight Crew Type 3549 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 204 Flight Crew Total 3576 Flight Crew Type 3576 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
For the second time for the day for flight ZZZ-ZZZ1; on climbout after flap retraction with the autopilot off accelerating through 225 knots the aircraft started to have mild oscillations for 10-15 seconds. Flight controls felt normal according to the captain who was the pilot flying. The only reason we discussed this occurrence was because this was our second flight of the day in this aircraft. Our previous flight was ZZZ-ZZZ1. While departing ZZZ on the zzzzz departure flying an ZZZZ1 departure profile; we were vectored off the departure by ATC early then given direct clearance to ZZZZZ1 intersection. This caused us to fly over terrain the sids normal track avoids but because of our altitude being that of which cleared the terrain; as usual ATC vectors us for a short cut. Around this time we were retracting flaps; accelerating through approximately 225 knots while I was hand flying the aircraft and it began mild oscillations that ended as we approached 250 knots and I thought were due to turbulence from the terrain we were safely above. The flight to ZZZ3 continued without any further anomalies. As we leveled off at our cruise altitude; we began to discuss the oscillations. We both assumed the first flights were terrain induced and never gave it a single thought. Once discussing the second occurrence; we pieced together the similar air speeds and configurations of the two occurrences. There is no flight manual procedure for this type of thing and came to the conclusion that this is something maintenance could address possibly; and the captain made the electronic logbook entry appropriately. Once reaching the gate and letting the passengers deplane; I was expecting to debrief maintenance about the occurrence to give them as much information as possible so they could properly diagnose the problem. Which is what happened. After discussion with the mechanic he informed us he would being filing the maintenance equivalent to a report; so I am filing this report as well.
Original NASA ASRS Text
Title: B737 flight crew reported airframe oscillations at similar airspeeds and configurations on multiple occasions.
Narrative: For the second time for the day for flight ZZZ-ZZZ1; on climbout after flap retraction with the autopilot off accelerating through 225 knots the aircraft started to have mild oscillations for 10-15 seconds. Flight controls felt normal according to the Captain who was the Pilot Flying. The only reason we discussed this occurrence was because this was our second flight of the day in this aircraft. Our previous flight was ZZZ-ZZZ1. While departing ZZZ on the ZZZZZ Departure flying an ZZZZ1 departure profile; we were vectored off the departure by ATC early then given direct clearance to ZZZZZ1 Intersection. This caused us to fly over terrain the SIDs normal track avoids but because of our altitude being that of which cleared the terrain; as usual ATC vectors us for a short cut. Around this time we were retracting flaps; accelerating through approximately 225 knots while I was hand flying the aircraft and it began mild oscillations that ended as we approached 250 knots and I thought were due to turbulence from the terrain we were safely above. The flight to ZZZ3 continued without any further anomalies. As we leveled off at our cruise altitude; we began to discuss the oscillations. We both assumed the first flights were terrain induced and never gave it a single thought. Once discussing the second occurrence; we pieced together the similar air speeds and configurations of the two occurrences. There is no Flight Manual procedure for this type of thing and came to the conclusion that this is something Maintenance could address possibly; and the captain made the Electronic Logbook entry appropriately. Once reaching the gate and letting the passengers deplane; I was expecting to debrief Maintenance about the occurrence to give them as much information as possible so they could properly diagnose the problem. Which is what happened. After discussion with the Mechanic he informed us he would being filing the Maintenance equivalent to a report; so I am filing this report as well.
Data retrieved from NASA's ASRS site 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.