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Flight crew of an air taxi flight in the western atlantic requested a higher altitude and was given clearance through the automatic dependent surveillance contract (ads-C) system. The ads-C read out clearance consisted of four pages and due to formatting confused the crew into climbing early.
| Attributes | |
| ACN | 1383253 |
| Time | |
| Date | 201608 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZWY.ARTCC |
| State Reference | NY |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Data Transmission and Automatic Calling |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
We were cruising at FL360 and requested FL430 via automatic dependent surveillance contract (ads-C). We were given clearance via ads-C communications to climb to and maintain FL430. The message was four pages in the FMS ATC communication menu. We accepted the clearance and we started the climb. On page two of the clearance; the top left of the screen showed what we believed to be a time stamp of the message. Preceding that page was the phrase '/at'. That phrase meant to start the climb at xa:29Z.the result was that we had already completed the climb prior to the required start of climb. The message was poorly formatted and resulted in a premature climb. There was no traffic observed during the climb and the flight continued to our destination without delay.
Original NASA ASRS Text
Title: Flight crew of an air taxi flight in the Western Atlantic requested a higher altitude and was given clearance through the Automatic Dependent Surveillance Contract (ADS-C) system. The ADS-C read out clearance consisted of four pages and due to formatting confused the crew into climbing early.
Narrative: We were cruising at FL360 and requested FL430 via Automatic Dependent Surveillance Contract (ADS-C). We were given clearance via ADS-C communications to climb to and maintain FL430. The message was four pages in the FMS ATC COM menu. We accepted the clearance and we started the climb. On page two of the clearance; the top left of the screen showed what we believed to be a time stamp of the message. Preceding that page was the phrase '/AT'. That phrase meant to start the climb at XA:29Z.The result was that we had already completed the climb prior to the required start of climb. The message was poorly formatted and resulted in a premature climb. There was no traffic observed during the climb and the flight continued to our destination without delay.
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.