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A crj-700 captain reported that btr tower issued a low altitude alert during his approach on the RNAV GPS runway 31.
| Attributes | |
| ACN | 614966 |
| Time | |
| Date | 200404 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : btr.airport |
| State Reference | LA |
| Altitude | msl single value : 600 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : btr.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 700 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument non precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 50 flight time total : 4000 flight time type : 2000 |
| ASRS Report | 614966 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | atc equipment : msaw atc equipment other atc equipment : radar other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Environmental Factor Aircraft |
| Primary Problem | Environmental Factor |
Narrative:
On the RNAV (GPS) runway 31 approach to baton rouge, we reached the FAF and began our descent to the minimum descent altitude of 520 ft MSL (450 ft AGL). In accordance with our company procedures, we set our altitude bug ag 600 ft MSL, 80 ft above the published MDA. Our radar altimeter was fluctuating between 520 ft and 530 ft AGL. We received a call from baton rouge tower saying, 'altitude alert, unsafe altitude,' or something along those lines -- I can't remember the exact phraseology. We doublechked our altimeter settings, barometric altimeters, radar altimeters, and GPS position and reported that we showed 600 ft MSL, just above the published MDA. The controller replied that he was just reporting what he showed on his screen. We had the runway lights in sight prior to the vdp and landed uneventfully.
Original NASA ASRS Text
Title: A CRJ-700 CAPT RPTED THAT BTR TWR ISSUED A LOW ALT ALERT DURING HIS APCH ON THE RNAV GPS RWY 31.
Narrative: ON THE RNAV (GPS) RWY 31 APCH TO BATON ROUGE, WE REACHED THE FAF AND BEGAN OUR DSCNT TO THE MINIMUM DSCNT ALT OF 520 FT MSL (450 FT AGL). IN ACCORDANCE WITH OUR COMPANY PROCS, WE SET OUR ALT BUG AG 600 FT MSL, 80 FT ABOVE THE PUBLISHED MDA. OUR RADAR ALTIMETER WAS FLUCTUATING BTWN 520 FT AND 530 FT AGL. WE RECEIVED A CALL FROM BATON ROUGE TWR SAYING, 'ALT ALERT, UNSAFE ALT,' OR SOMETHING ALONG THOSE LINES -- I CAN'T REMEMBER THE EXACT PHRASEOLOGY. WE DOUBLECHKED OUR ALTIMETER SETTINGS, BAROMETRIC ALTIMETERS, RADAR ALTIMETERS, AND GPS POS AND RPTED THAT WE SHOWED 600 FT MSL, JUST ABOVE THE PUBLISHED MDA. THE CTLR REPLIED THAT HE WAS JUST RPTING WHAT HE SHOWED ON HIS SCREEN. WE HAD THE RWY LIGHTS IN SIGHT PRIOR TO THE VDP AND LANDED UNEVENTFULLY.
Data retrieved from NASA's ASRS site as of July 2007 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.