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B737NG captain reported executing a go-around after receiving a 'too low terrain' alert on short final at rjaa.
| Attributes | |
| ACN | 1421962 |
| Time | |
| Date | 201702 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | RJAA.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 3005.9 |
| Events | |
| Anomaly | Deviation - Speed All Types Inflight Event / Encounter Unstabilized Approach Inflight Event / Encounter Weather / Turbulence |
Narrative:
On approach to rjaa for ILS 34L; ATIS reported surface winds (approximately) 310/24g28. Earlier; aircraft on both 34L and 34R had reported wind shear with +/-10 and +/-15 knots; respectively. This information was also on the arrival ATIS. We had an approach speed for flap 30 of 147 with a wind correction of +15 for a reference speed of 162. Passing approximately 500 AGL; a performance increasing wind shear occurred with the IAS noted at 175; right at the flap limit speed for flaps 30. Throttle were reduced to correct the deviation; but at no time was idle thrust selected. By 300 feet AGL; speed was approximately 165-170 and fluctuating. Passing 200 feet AGL; we were on ILS GS with PAPI showing one white and three red. We were within speed parameters for a stabilized approach and in a safe position to land. At this time the ground proximity warning system (GPWS) gave several warnings of 'too low terrain'. At this time; we verified our configuration and noted the flaps indicated 25 degrees; but the handle was in the 30 degree detent. Without delay; we executed a go around.the following approach had similar conditions; but reactions to the expected performance-increasing wind shear resulted in airspeed deviation of no greater than 10 IAS. The resulting approach and landing were uneventful.I would have expected 'too low flaps' for this condition. I am not sure why we got 'too low terrain'. Either warning would have given the same result; but we would have had more clarity on our issue with the more appropriate warning.
Original NASA ASRS Text
Title: B737NG Captain reported executing a go-around after receiving a 'Too low terrain' alert on short final at RJAA.
Narrative: On approach to RJAA for ILS 34L; ATIS reported surface winds (approximately) 310/24G28. Earlier; aircraft on both 34L and 34R had reported wind shear with +/-10 and +/-15 knots; respectively. This information was also on the arrival ATIS. We had an approach speed for Flap 30 of 147 with a wind correction of +15 for a reference speed of 162. Passing approximately 500 AGL; a performance increasing wind shear occurred with the IAS noted at 175; right at the flap limit speed for Flaps 30. Throttle were reduced to correct the deviation; but at no time was idle thrust selected. By 300 feet AGL; speed was approximately 165-170 and fluctuating. Passing 200 feet AGL; we were on ILS GS with PAPI showing one white and three red. We were within speed parameters for a stabilized approach and in a safe position to land. At this time the Ground Proximity Warning System (GPWS) gave several warnings of 'Too low terrain'. At this time; we verified our configuration and noted the Flaps indicated 25 degrees; but the handle was in the 30 degree detent. Without delay; we executed a go around.The following approach had similar conditions; but reactions to the expected performance-increasing wind shear resulted in airspeed deviation of no greater than 10 IAS. The resulting approach and landing were uneventful.I would have expected 'Too low Flaps' for this condition. I am not sure why we got 'Too low terrain'. Either warning would have given the same result; but we would have had more clarity on our issue with the more appropriate warning.
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.