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B737-800 captain reported erroneous airspeed indications and stick shaker during takeoff.
| Attributes | |
| ACN | 1681672 |
| Time | |
| Date | 201909 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flap/Slat Indication |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 155 Flight Crew Type 3172 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On the departure; I was the flying pilot. At 300 feet AGL; we watched the airspeed tape go from normal takeoff speed indication to watch the red band rise from 140 to 190 kts. The pitch and power settings were the same as usual for the weight for this scenario as I've seen on a 737-800 many times before. We had the stick shaker go off but in a split decision due to proximity to ground and previous experience with the aircraft setting; I decided to hold the yoke; power as it was due to theory it was an erroneous indication. After a few seconds; the speed tape returned to normal and shaker stopped. The [maintenance document] had one other write up of the same situation [days earlier]. Once the first officer (first officer) and I agreed it was safe to proceed; I wrote the aircraft up in ZZZ1 as well as called [maintenance control] later in the day (red eye arrival to ZZZ1.) apparently the number 3 flap had a bad sensor and was taken out of service for 22 hours.
Original NASA ASRS Text
Title: B737-800 Captain reported erroneous airspeed indications and stick shaker during takeoff.
Narrative: On the departure; I was the flying pilot. At 300 feet AGL; we watched the airspeed tape go from normal takeoff speed indication to watch the red band rise from 140 to 190 kts. The pitch and power settings were the same as usual for the weight for this scenario as I've seen on a 737-800 many times before. We had the stick shaker go off but in a split decision due to proximity to ground and previous experience with the aircraft setting; I decided to hold the yoke; power as it was due to theory it was an erroneous indication. After a few seconds; the speed tape returned to normal and shaker stopped. The [Maintenance Document] had one other write up of the same situation [days earlier]. Once the FO (First officer) and I agreed it was safe to proceed; I wrote the aircraft up in ZZZ1 as well as called [Maintenance Control] later in the day (red eye arrival to ZZZ1.) Apparently the Number 3 flap had a bad sensor and was taken out of service for 22 hours.
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.