ENR 1.4  ATS AIRSPACE CLASSIFICATION

1  Classification of Airspace

1.1 The airspace within Hong Kong FIR is subdivided into three classifications (A, C and G) according to ICAO specifications. The requirements for the flights within each class of airspace are shown in the following table.
Class (Note 3) Type of Flight Separation Provided Service Provided Speed Limitation Radio Communication Requirement Subject to an ATC Clearance
A IFR only All Aircraft Air Traffic Control Service Not Applicable
(Note 1)		 Continuous two-way Yes
C IFR IFR from IFR
IFR from VFR		 Air Traffic Control Service Not Applicable
(Note 1)		 Continuous two-way Yes
VFR VFR from IFR 1) Air Traffic Control Service for separation from IFR;
2) VFR/VFR traffic information (and traffic avoidance advice on request)		 250 KIAS below
10 000 ft AMSL		 Continuous two-way Yes
G IFR Nil Flight Information Service 250 KIAS below
10 000 ft AMSL		 Continuous two-way No
VFR Nil Flight Information Service 250 KIAS below
10 000 ft AMSL		 Continuous two-way
(Note 2)		 No 
Note 1: Speed restriction applies to flights departing from and arriving to Hong Kong International Airport and Macao International Airport, pilot shall refer to ENR 1.5, respective AIP AD sections, SID, STAR and Instrument Approach Charts for details.
Note 2: Two-way communication is required in Class G Airspace within 50 NM of BIGEX, beneath Hong Kong TMA and in UCARAs. Two-way communication is not required in Class G Airspace south of Hong Kong TMA.
Note 3: Classes of airspace B, D, E and F are not used in Hong Kong FIR.

2  ATS Airspace Description

Airspace Levels Classification
Within 50 NM of BIGEX
(excluding airspace within and above Hong Kong CTR
and UCARAs)		 UNL
8 000 ft		 A
8 000 ft
2 000 ft		 C
2 000 ft
SFC		 G
(See Note 1)
Exceeding 50 NM from BIGEX but within Hong Kong
TMA		 UNL
8 000 ft		 A
Exceeding 50 NM from BIGEX and beneath Hong
Kong TMA		 8 000 ft
SFC		 G
(See Note 1)
Above Hong Kong CTR UNL
9 000 ft		 A
Hong Kong CTR 9 000 ft
SFC		 C
Above UCARAs UNL
9 000 ft		 A
9 000 ft
Upper limit of UCARAs		 C
UCARAs Upper limit of UCARAs
SFC		 G
(See Note 1)
Airspace south of Hong Kong TMA UNL
8 000 ft		 A
8 000 ft
SFC		 G
(See Note 2) 
Note 1: 2-way communication required
Note 2: 2-way communication not required South of Hong Kong TMA
Note 3: See ENR 2.1 for lateral limits of airspace.