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This document explains various definitions used throughout the Australian sector procedures.
In order to simplify notation for standing agreements airports have been grouped into Clutches. They are as follows:
| Brisbane FIR | YBBB_'X'_CTR - YB'XX"_CTR |
| Melbourne FIR | YMMM_'X'_CTR - YM'XX'_CTR |
Altitude restrictions and agreements are noted as follows:
FL100 |
Must not be used as an assigned cruise level. (AU Transisition Altitude) |
FL110 |
Must not be used as an assigned cruise level. (AU Transisition Level) |
MSL |
Minimum Stack Level (A090 - 9000ft). |
Bandboxing
Combining two or more sectors into one position (Upper Centers).
Designated sector
A sector listed in the table of contents with a unique identifier.
External agreement (in/out)
Standing agreements with international units. No co-ordination should be needed if traffic is offered at the levels and points specified but it is good practise to confirm that all agreements are valid when first connecting.
Internal agreement (in/out)
Standing agreements with other AU sectors. No co-ordination is needed if traffic is offered at the levels and points specified.
Position
Controlling station, can be one or more sectors if bandboxed.
YBBBO
Brisbane FIR (IvAc: YBBO_CTR)
YMMO
Melbourne FIR (IvAc: YMMO_CTR)
YBBB_N_CTR
Brisbane North Oceanic (IvAc: YBBB_N_CTR)
YBBB_N_CTR
Brisbane South Oceanic (IvAc: YBBB_S_CTR)
YMMM_N_CTR
Melbourne North Oceanic (IvAc: YMMM_N_CTR)
YMMM_S_CTR
Melbourne South Oceanic (IvAc: YMMM_S_CTR)
YBBN_CTR
Brisbane Center (IvAc: YBBN_CTR)
YMML_CTR
Melbourne Center (IvAc: YMML_CTR)