 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of medium large transport air carrier aircraft made a missed approach during an autoplt coupled ILS approach after the autoplt malfunctioned causing the aircraft to go below min safe terrain altitude.
| Attributes | |
| ACN | 211247 |
| Time | |
| Date | 199205 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 1800 msl bound upper : 1800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach landing : missed approach other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 15000 flight time type : 400 |
| ASRS Report | 211247 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 3500 flight time type : 1500 |
| ASRS Report | 211556 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude |
| Independent Detector | atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Autoplt coupled approach. Everything normal. At about 1800 ft AGL noted slight GS deviation autoplt tried to correct but overloaded then went into up and down gyrations exceeding 1000 FPM. Executed manual missed approach and diverted to alternate airport. Tower controller advised us of low altitude alert as we were starting the missed approach. Old style manufacturer model autoplt.
Original NASA ASRS Text
Title: FLC OF MLG ACR ACFT MADE A MISSED APCH DURING AN AUTOPLT COUPLED ILS APCH AFTER THE AUTOPLT MALFUNCTIONED CAUSING THE ACFT TO GO BELOW MIN SAFE TERRAIN ALT.
Narrative: AUTOPLT COUPLED APCH. EVERYTHING NORMAL. AT ABOUT 1800 FT AGL NOTED SLIGHT GS DEV AUTOPLT TRIED TO CORRECT BUT OVERLOADED THEN WENT INTO UP AND DOWN GYRATIONS EXCEEDING 1000 FPM. EXECUTED MANUAL MISSED APCH AND DIVERTED TO ALTERNATE ARPT. TWR CTLR ADVISED US OF LOW ALT ALERT AS WE WERE STARTING THE MISSED APCH. OLD STYLE MANUFACTURER MODEL AUTOPLT.
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.