0. AIDC Implementation in Hong Kong, China
APAC/NAT AIDC TF/2 - AIDC Seminar
Stanley Lau
Ag. Senior Electronics Engineer
Civil Aviation Department
Hong Kong, China
23 July 2013

1. Background
Hong Kong, China has put AIDC into operational use between HK and Sanya since Feb 2007.
Standalone system use real-time data from ATM System.
Further AIDC technical tests have been conducted with other ACCs such as Guangzhou, Zhangjiang, Taibei
HK and Taibei AIDC operation commenced on 16 Nov 2012.
Success in reduction of ATM personnel workload and elimination of human errors arising from voice communications via Inter Area Speech Circuit (IASC).

2. Operation Efficiency
Using subset of core messages, namely, EST, ACP, LAM, LRM as well as TOC and AOC with Sanya recently (28 Mar 2013) out of the 13 core messages as agreed with counterparts in accordance with APAC AIDC ICD and ICAO ASBU B0-25.
Efficiency gained by utilizing AIDC is significant. e.g. in Dec 2012, about 29,000 transactions (HK-Sanya and HK-Taibei) were completed, representing the equivalent number of IASC calls were saved. Less than 6% of transactions reverted to voice, including missing flight plans, late/fail AFTN transmissions as well as operation needs.
Expecting more extensive AIDC usage in new ATMS.

3. Implementation Issues
Different versions of AIDC messages and Cyclic Redundancy Check (CRC) initial values (Xmodem, Kermit, 0xffff and 0x1d0f) being utilized, AIDC partners require to indicate which ICD version and CRC initial values during technical testing.
LRM and error code/messages feedback from counterparts needed to be captured in the Problem Message Queue (PMQ) of the ATM System and require prompt response to the counterparts e.g. voice coordination.
AFTN and subsequent ATN network with inherent network latency, circuit diversion/re-route or system maintenance of the network that will affect the timeliness of AIDC messages, which are considered as time- and mission-critical.

4. Main Screen of CAD AIDC system
Blue = Arrival
Yellow = Departure
Pink = Over Flight
Same colour code as the ATM system paper strip

5. Civil Aviation Department Hong Kong, China
Dialogue Boxes for [EST] message (top left) and [ACP] message (bottom right)
The AIDC system would check the incoming [EST] with the existing flight plan information. No [ACP] dialogue would be pop-up automatically if inconsistency found.

6. Thank You
Reference: APAC ATNICG/8 – WP17 (