 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737 captain reported simultaneously receiving an egpws 'caution obstacle' alert and an ATC low altitude warning while on approach into dca.
| Attributes | |
| ACN | 1556512 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | DCA.Airport |
| State Reference | DC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Other RNAV RNP Runway 19 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Unstabilized Approach |
Narrative:
On the RNAV (rnp) runway 19 arrival; after completing the checklist; fully configured at greyz; somewhere between I believe jubol and wirso we received an egpws 'caution obstacle' alert. Simultaneously the tower called and said we were low on our altitude. The first officer tried to respond to the tower but mistakenly pushed the autopilot disconnect button creating a confusion for me as the flying pilot as to what just happened. At that point; I started to hand fly the aircraft back onto the proper course and altitude for the remainder of the approach. As I was climbing; the aircraft back to a higher altitude we got slow and had to add power. With the nose up attitude; there was a momentary disorientation as to where the runway was located. Found the approach lights and VASI; corrected for being high and made a normal landing. Neither the first officer nor I can understand how the aircraft got into this situation. We had pre briefed the approach and checked all the points. Everything seemed normal from greyz and setoc points on the approach. This is obviously not acceptable and I would greatly appreciate it if someone would look into this so I can find out if it was human error or FMC error.
Original NASA ASRS Text
Title: B737 Captain reported simultaneously receiving an EGPWS 'Caution Obstacle' alert and an ATC low altitude warning while on approach into DCA.
Narrative: On the RNAV (RNP) Runway 19 arrival; after completing the checklist; fully configured at GREYZ; somewhere between I believe JUBOL and WIRSO we received an EGPWS 'Caution Obstacle' alert. Simultaneously the tower called and said we were low on our altitude. The First Officer tried to respond to the tower but mistakenly pushed the autopilot disconnect button creating a confusion for me as the flying pilot as to what just happened. At that point; I started to hand fly the aircraft back onto the proper course and altitude for the remainder of the approach. As I was climbing; the aircraft back to a higher altitude we got slow and had to add power. With the nose up attitude; there was a momentary disorientation as to where the runway was located. Found the approach lights and VASI; corrected for being high and made a normal landing. Neither the First Officer nor I can understand how the aircraft got into this situation. We had pre briefed the approach and checked all the points. Everything seemed normal from GREYZ and SETOC points on the approach. This is obviously not acceptable and I would greatly appreciate it if someone would look into this so I can find out if it was human error or FMC error.
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.