civil aviation bureau of japan ministry of land infrastructure and transport japan civil aviation...
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CIVIL AVIATION BUREAU OF JAPANCIVIL AVIATION BUREAU OF JAPANMinistry of Land Infrastructure and Transport
Japan Civil Aviation Bureau
IPACG/40IPACG/40
September, 2014September, 2014
Significant delaySignificant delay in AIDC transaction in AIDC transaction
Systems Development, Evaluation Systems Development, Evaluation and Contingency management Centerand Contingency management Center
(SDECC)(SDECC)
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
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
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (February 2014)
0
10
20
30
40
50
60
70
80
1-Fe
b
2-Fe
b
3-Fe
b
4-Fe
b
5-Fe
b
6-Fe
b
7-Fe
b
8-Fe
b
9-Fe
b
10-F
eb
11-F
eb
12-F
eb
13-F
eb
14-F
eb
15-F
eb
16-F
eb
17-F
eb
18-F
eb
19-F
eb
20-F
eb
21-F
eb
22-F
eb
23-F
eb
24-F
eb
25-F
eb
26-F
eb
27-F
eb
28-F
eb
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (February 2014)
4
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
0
10
20
30
40
50
60
70
80
1-M
ar2-
Mar
3-M
ar4-
Mar
5-M
ar6-
Mar
7-M
ar8-
Mar
9-M
ar10
-Mar
11-M
ar12
-Mar
13-M
ar14
-Mar
15-M
ar16
-Mar
17-M
ar18
-Mar
19-M
ar20
-Mar
21-M
ar22
-Mar
23-M
ar24
-Mar
25-M
ar26
-Mar
27-M
ar28
-Mar
29-M
ar30
-Mar
31-M
ar
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (March 2014)
Number of timeouts (March 2014)
AIDC transaction timeouts occurred 77 times.AIDC
transaction timeouts occurred 23 times.
5
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (April 2014)
0
10
20
30
40
50
60
70
80
1-Ap
r2-
Apr
3-Ap
r4-
Apr
5-Ap
r6-
Apr
7-Ap
r8-
Apr
9-Ap
r10
-Apr
11-A
pr12
-Apr
13-A
pr14
-Apr
15-A
pr16
-Apr
17-A
pr18
-Apr
19-A
pr20
-Apr
21-A
pr22
-Apr
23-A
pr24
-Apr
25-A
pr26
-Apr
27-A
pr28
-Apr
29-A
pr30
-Apr
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (April 2014)
AIDC transaction timeouts occurred 20 times.
6
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (May 2014)
0
10
20
30
40
50
60
70
80
1-M
ay2-
May
3-M
ay4-
May
5-M
ay6-
May
7-M
ay8-
May
9-M
ay10
-May
11-M
ay12
-May
13-M
ay14
-May
15-M
ay16
-May
17-M
ay18
-May
19-M
ay20
-May
21-M
ay22
-May
23-M
ay24
-May
25-M
ay26
-May
27-M
ay28
-May
29-M
ay30
-May
31-M
ay
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (May 2014)
AIDC transaction timeouts occurred 39 times.AIDC
transaction timeouts occurred 19 times.
7
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (June 2014)
8
0
10
20
30
40
50
60
70
80
1-Ju
n
2-Ju
n
3-Ju
n
4-Ju
n
5-Ju
n
6-Ju
n
7-Ju
n
8-Ju
n
9-Ju
n
10-J
un
11-J
un
12-J
un
13-J
un
14-J
un
15-J
un
16-J
un
17-J
un
18-J
un
19-J
un
20-J
un
21-J
un
22-J
un
23-J
un
24-J
un
25-J
un
26-J
un
27-J
un
28-J
un
29-J
un
30-J
un
PAZN RJJJ-PAZN over 180 sec
PAZN RJJJ-PAZN over 60 sec
KZCE RJJJ-KZOA over 180 sec
KZCE RJJJ-KZOA over 60 sec
PAZN RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (June 2014)
AIDC transaction timeouts occurred 20 times.
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (July 2014)
9
0
10
20
30
40
50
60
70
80
90
1-Ja
n
2-Ja
n
3-Ja
n
4-Ja
n
5-Ja
n
6-Ja
n
7-Ja
n
8-Ja
n
9-Ja
n
10-J
an
11-J
an
12-J
an
13-J
an
14-J
an
15-J
an
16-J
an
17-J
an
18-J
an
19-J
an
20-J
an
21-J
an
22-J
an
23-J
an
24-J
an
25-J
an
26-J
an
27-J
an
28-J
an
29-J
an
30-J
an
31-J
an
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (July 2014)
AIDC transaction timeouts occurred 85 times.
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Number of timeouts (August 2014)
10
0
10
20
30
40
50
60
70
80
1-Au
g
2-Au
g
3-Au
g
4-Au
g
5-Au
g
6-Au
g
7-Au
g
8-Au
g
9-Au
g
10-A
ug
11-A
ug
12-A
ug
13-A
ug
14-A
ug
15-A
ug
16-A
ug
17-A
ug
18-A
ug
19-A
ug
20-A
ug
21-A
ug
22-A
ug
23-A
ug
24-A
ug
25-A
ug
26-A
ug
27-A
ug
28-A
ug
29-A
ug
30-A
ug
31-A
ug
RJJJ-PAZN over 180 sec
RJJJ-PAZN over 60 sec
RJJJ-KZOA over 180 sec
RJJJ-KZOA over 60 sec
RJJJ-PAZN/KZOA over 180 sec
AIDC transaction time between RJJJ and PAZN/KZOA (August 2014)
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
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
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
RJJJ
Other ATSU
Cause of AIDC transaction delay
FIMSAMHSserver
AIDCserver
AFTNstation
AFTNstation
DELAY
A transmission delay will occur when FIMS receives over 100 ATS messages per minute from AMHS and AFTN.
AMHS link
AFTNstation
13
Japan Civil Aviation Bureau
Systems Development, Evaluation and Contingency management Center
Alternate routing of AFTN line
14
RJJJKSLC
A
B E
C
D
Z AFTN station Ordinary routing
Alternate routing
AFTN line trouble
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