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B737-800 first officer reported an airspeed deviation during approach that resulted in a go-around.
| Attributes | |
| ACN | 1451127 |
| Time | |
| Date | 201705 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flap/Slat Indication |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Speed All Types Inflight Event / Encounter Unstabilized Approach |
Narrative:
While configuring on final; the captain (ca) selected gear down and flaps 15 about one and a half miles outside the ILS marker. Speed was 170; autopilot was off; autothrottes on. Vref was set at 144 knots. As the aircraft continued to slow; the ca called for flaps 25. I then noticed both the amber min maneuver bar and red min airspeed bar were rising close to our current speed. I asked the ca if he wanted flaps 30. He set his bug speed back to 150 knots. I had set flaps to 25. At that point; the red bar rose above our indicated speed of 150. I looked at the speed window and saw 'a150'. We simultaneously got the 'airspeed low; airspeed low' callout; and the throttles were advancing. We executed a go-around uneventfully. On the subsequent approach; we configured early and slowly looking for reoccurrence; but approach and landing were normal.we suspect a flap indication malfunction.closely checking the position of the red bar for reasonableness throughout configuration; and be ready to execute go around with conflicting indications.
Original NASA ASRS Text
Title: B737-800 First Officer reported an airspeed deviation during approach that resulted in a go-around.
Narrative: While configuring on final; the Captain (CA) selected gear down and flaps 15 about one and a half miles outside the ILS marker. Speed was 170; autopilot was off; autothrottes on. Vref was set at 144 knots. As the aircraft continued to slow; the CA called for flaps 25. I then noticed both the amber min maneuver bar and red min airspeed bar were rising close to our current speed. I asked the CA if he wanted flaps 30. He set his bug speed back to 150 knots. I had set flaps to 25. At that point; the red bar rose above our indicated speed of 150. I looked at the speed window and saw 'a150'. We simultaneously got the 'airspeed low; airspeed low' callout; and the throttles were advancing. We executed a go-around uneventfully. On the subsequent approach; we configured early and slowly looking for reoccurrence; but approach and landing were normal.We suspect a flap indication malfunction.Closely checking the position of the red bar for reasonableness throughout configuration; and be ready to execute go around with conflicting indications.
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.