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Captain of air carrier medium large transport aircraft deviated from assigned altitude in response to a GPWS warning.
| Attributes | |
| ACN | 227580 |
| Time | |
| Date | 199212 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : hln |
| State Reference | MT |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zlc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 2500 |
| ASRS Report | 227580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 1200 |
| ASRS Report | 227571 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Air carrier flight number from gtf to hnl on V-21 centerline, cruise at 10000 (MEA) just switched from slc center to helena approach. I noticed a movement of the radio altimeter (at MEA altitudes, this is not unusual) but a few seconds later, the GPWS terrain warning sounding . Since I was IMC, I immediately disconnected the autoplt throttles and started a climb. The terrain warning stopped after approximately 400 ft and I chose to level at 12000 (actually went as high as 12300 before leveling) this information was immediately relayed to hnl. My concern is if hln relayed the reason for my climb -- GPWS warning.
Original NASA ASRS Text
Title: CAPT OF ACR MLG ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A GPWS WARNING.
Narrative: ACR FLT NUMBER FROM GTF TO HNL ON V-21 CTRLINE, CRUISE AT 10000 (MEA) JUST SWITCHED FROM SLC CTR TO HELENA APCH. I NOTICED A MOVEMENT OF THE RADIO ALTIMETER (AT MEA ALTS, THIS IS NOT UNUSUAL) BUT A FEW SECONDS LATER, THE GPWS TERRAIN WARNING SOUNDING . SINCE I WAS IMC, I IMMEDIATELY DISCONNECTED THE AUTOPLT THROTTLES AND STARTED A CLB. THE TERRAIN WARNING STOPPED AFTER APPROX 400 FT AND I CHOSE TO LEVEL AT 12000 (ACTUALLY WENT AS HIGH AS 12300 BEFORE LEVELING) THIS INFO WAS IMMEDIATELY RELAYED TO HNL. MY CONCERN IS IF HLN RELAYED THE REASON FOR MY CLB -- GPWS WARNING.
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.