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03:44:45 (Note: Extracted from ANSP system data recording time stamp)
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13. Operational Message Round trip time (from sending uplink (#8) to receipt of
operational response (#9) in seconds e.g. 80
14. Downlink Response Transit time in seconds (#12-#11) e.g. 30
15. Uplink Message Elements (all uplink message element numbers preceded by U
encapsulated between quotation marks with a space between each element) e.g.
“U118 U80” (Note: Extracted from the decoded operational uplink that initiated the
transaction)
16. Downlink Message Elements (all downlink message elements encapsulated between
quotation marks with a space between each element if required) e.g. “D0” (Note:
Extracted from the decoded operational downlink)
17. ACTP (Actual communication technical performance in seconds) e.g 35 (Note:
truncated to whole seconds)
18. ACP (Actual communications performance in seconds measured as the difference
between time uplink sent (#8) to operational response received (#12)) e.g 80
19. PORT (the operational response is received before the MAS as per Figure 2 above
Pilot Operational Response Time = ACP (#18) - ACTP(#17) e.g. 45 (Note:
Implementers should allow for negative values where.
20. Transaction Completion Indicator – “S” for successful, “F” for failed. The
transaction is considered successful if TRN <= 1800 and items 1-19 can be
determined. If a transaction fails, all of the data that can be determined should be
included in the record.
The data record for each CPDLC transaction
To enable regional analysis and aggregation of data CPDLC transaction data as described
above is sent to the regional CRA at agreed intervals (usually monthly) as a comma delimited
text file. The format for each record will at minimum contain the 20 data points specified in
the previous paragraph. Using the example in the previous paragraph the data record for the
transaction described above in comma delimited text file format is:
NZZO,N104UA,B744,UAL,20081114,POR1,AKL1,03:43:25, 03:43:55,10,03:44:15,03:44:45,80,30,”U118 U80”,”D0”,35,80,45,S
Recording the ADS-C data points for each ADS-C downlink.
The following data points are recommended as the minimum set that should be extracted
from ANSP datalink system recordings to enable an analysis of ADS-C latency and provide
sufficient information for problem analysis. This does not preclude individual ANSP from
extracting additional data points for their own analysis. To obtain all of these data points
ANSP should note that they will require additional database information to enable the
Aircraft Type and Airline to be obtained by correlation to the Tail Number extracted from the
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datalink recordings. All of the other data points are extracted from either the ACARS header
or the ADS application message.
1. ANSP - the four letter ICAO designator for the FIR of the reporting ANSP e.g.
NZZO.
2. Tail Number – the aircraft tail number in ICAO Doc 4444 Format (no hyphens,
packing dots etc) e.g N104UA (Note: Extracted from ACARS header)
3. Aircraft Type Designator – the ICAO type designator e.g B744 (Note: extracted from
ANSP database using Tail Number as key)
4. Airline Designator – the IATA designator for the airline. e.g UAL (Note: extracted
from ANSP database using Tail Number as key)
5. Date – in YYYYMMDD format. e.g 20081114 (Note: Extracted from ANSP system
data recording time stamp)
6. RGS - Designator of the RGS that ADS downlink was received from e.g. POR1
(Note: This is a 3 or 4 letter designator extracted from the ACARS header DT line)
7. Report Type – The type of ADS report e.g PER (Note: Extracted from the Basic ADS
group report tag where tag value 7=PER, 9=EMG, 10=LDE, 18=VRE, 19=ARE,
20=WCE)
8. Latitude – The current latitude decoded from the Basic ADS group. The format is
“+” for North or “-“ for South followed by a decimal number of degrees e.g. -
33.456732
9. Longitude – The current longitude decoded from the Basic ADS group. The format is
“+” for East or “-“ for West followed by a decimal number of degrees e.g.
+173.276554
10. Aircraft Time - The time the ADS message was sent from the aircraft in HH:MM:SS
e.g 03:44:15. (Note: Decoded from the Basic ADS group timestamp extracted as
seconds since the most recent hour. (See RTCA DO-258A section 4.5.1.4))
11. Received Time - The ANSP timestamp on the receipt of the ADS Message in
HH:MM:SS e.g. 03:44:45 (Note: Extracted from ANSP system data recording time
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