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B90L pilot reported receiving a terrain warning and a climb clearance from ATC after he misunderstood his clearance and descended early.
| Attributes | |
| ACN | 1388732 |
| Time | |
| Date | 201609 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | GSP.TRACON |
| State Reference | SC |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | King Air C90 E90 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Single Pilot Pilot Flying |
| Qualification | Flight Crew Commercial Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 6000 Flight Crew Type 20 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
Descending en-route to ceu. Previous altitude clearance had been descend and maintain 7000 feet. Next clearance was copied as 'cleared direct tuzko and the RNAV (GPS) runway 7 approach'. Descent was initiated. Upon reaching 6000 feet ATC advised that clearance to maintain 7000 feet was still in effect and that I should climb immediately for terrain avoidance. Upon reaching 7000 feet I asked ATC to repeat my last clearance. ATC read 'cleared direct tuzko for the RNAV (GPS) runway 7 approach'. With communication difficulties I understood and read back cleared for the approach. Being approximately 10 NM from tuzko; I intended to cross tuzko at 4700 feet as published.the root cause can be described as miscommunication. The importance of using standard phraseology cannot be overstated. Possibly changes in communication protocols should be considered including exact read backs and restating altitude clearances.
Original NASA ASRS Text
Title: B90L Pilot reported receiving a terrain warning and a climb clearance from ATC after he misunderstood his clearance and descended early.
Narrative: Descending en-route to CEU. Previous altitude clearance had been descend and maintain 7000 feet. Next clearance was copied as 'cleared direct TUZKO and the RNAV (GPS) RWY 7 Approach'. Descent was initiated. Upon reaching 6000 feet ATC advised that clearance to maintain 7000 feet was still in effect and that I should climb immediately for terrain avoidance. Upon reaching 7000 feet I asked ATC to repeat my last clearance. ATC read 'cleared direct TUZKO for the RNAV (GPS) RWY 7 Approach'. With communication difficulties I understood and read back cleared for the approach. Being approximately 10 NM from TUZKO; I intended to cross TUZKO at 4700 feet as published.The root cause can be described as miscommunication. The importance of using standard phraseology cannot be overstated. Possibly changes in communication protocols should be considered including exact read backs and restating altitude clearances.
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.