ENR 1.6 - ATS Surveillance Services and Procedures

Question 1

What is an HTZ?

What are the dimensions of an HTZ?

Answer 1

• A Helicopter Traffic Zone, an area established as notification of helicopters engaged in platform approaches, departures and extensive unco-ordinated inter-platform transit flying
• HTZs consist of the airspace from sea level to 2000ft vertically, 1.5 nm radius laterally around each individual platform helideck. Neighbouring HTZ’s are joined by tangential lines where these do not exceed 5nm in length

Question 2

What are HMRs?

Answer 2

Helicopter Main Routes. Routes typically and routinely flown by helicopters operating to and from off-shore destinations, promulgated for the purpose of signposting concentrations of helicopter traffic to other airspace users.

Question 3

What class of airspace are HMRs?

Answer 3

HMRs have no airspace status and assume the background airspace classification within which they lie

Question 4

What are the lateral dimensions of HMRs?

Answer 4

HMRs have no lateral dimensions

Question 5

What are the vertical dimensions of HMRs over the Northern North Sea?

Answer 5

1500ft altitude to FL85

Question 6

What is the ‘master/prime’ HMR?

Which direction does it flow?

Where does it terminate?

Answer 6

• 029 HMR
• Outbound
• Lima Gate

Question 7

What is the spacing between adjacent HMRs?

How do they alternate?

Answer 7

• 3°
• HMRs alternate so that no two adjacent HMRs flow in the same direction

Question 8

List the HMRs with direction of flow to each ESB Gate

Answer 8

• HMR 023 - Golf Gate - outbound
• HMR 026 - Juliet Gate - inbound
• HMR 029 - Lima Gate - outbound
• HMR 032 - November - inbound
• HMR 035 - Oscar - outbound

Question 9

Which HMR is not used and why?

Answer 9

HMR 038. It is the boundary between the Sumburgh Radar and Rebros sectors.