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CIVIL AVIATION BUREAU OF JAPAN Ministry of Land Infrastructure and Transport Japan Civil Aviation Bureau IPACG/40 September, 2014 Significant delay in.

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Presentation on theme: "CIVIL AVIATION BUREAU OF JAPAN Ministry of Land Infrastructure and Transport Japan Civil Aviation Bureau IPACG/40 September, 2014 Significant delay in."— Presentation transcript:

1 CIVIL AVIATION BUREAU OF JAPAN Ministry of Land Infrastructure and Transport Japan Civil Aviation Bureau IPACG/40 September, 2014 Significant delay in AIDC transaction Systems Development, Evaluation and Contingency management Center (SDECC)

2 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Switchover of AIDC line  At IPACG/39, JCAB reported as follows: AIDC line between FAA and JCAB was switched over from leased line to AMHS on 9 July 2013. AIDC transaction time via AMHS was generally within 20 seconds, which was longer than via leased line, this was acceptable for AIDC operation. 2

3 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Increase of AIDC transaction timeouts  JCAB received information from FAA that the number of AIDC transaction timeouts was on the increase from January 2014.  On investigation, the following fact was found: Consecutive AIDC transaction timeouts occurred in a short time period; This time period came out irregularly by the frequency of once or twice a month. In this time period, it takes several minutes until FIMS (system handling ATS messages in JCAB) transmits an AIDC message to AIDC server after receiving it from AMHS. 3

4 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (February 2014) 4

5 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (March 2014) AIDC transaction timeouts occurred 77 times. AIDC transaction timeouts occurred 23 times. 5

6 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (April 2014) AIDC transaction timeouts occurred 20 times. 6

7 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (May 2014) AIDC transaction timeouts occurred 39 times. AIDC transaction timeouts occurred 19 times. 7

8 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (June 2014) 8 AIDC transaction timeouts occurred 20 times.

9 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (July 2014) 9 AIDC transaction timeouts occurred 85 times.

10 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Number of timeouts (August 2014) 10

11 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Cause of AIDC transaction timeouts  A transmission delay occurred in a data transmitting from FIMS to AIDC server, when a data congestion at FIMS occurred.  FIMS can process up to 100 ATS messages (include AIDC messages) which received from AMHS and AFTN lines, per minute.  When significant number of timeouts occurred, FIMS was receiving over 250 ATS messages per minute. 11

12 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Cause of AIDC transaction timeouts  These messages contained the ATS messages not passing through RJJJ in a usual condition.  It can be inferred that when AFTN alternate sub- network was established due to AFTN line trouble which had occurred somewhere in the world, ATS messages accumulated in AFTN network flowed into RJJJ. 12

13 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center RJJJ Other ATSU Cause of AIDC transaction delay FIMS AMHS server AIDC server AFTN station AFTN station DELAY A transmission delay will occur when FIMS receives over 100 ATS messages per minute from AMHS and AFTN. AMHS link AFTN station 13

14 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Alternate routing of AFTN line 14 RJJJ KSLC A B E C D Z AFTN station Ordinary routing Alternate routing AFTN line trouble

15 Japan Civil Aviation Bureau Systems Development, Evaluation and Contingency management Center Countermeasures for this issue  The measure to be taken for this problem is under consideration in JCAB. 15

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