Aviation Policy Update

Did you know?
The millibar (mb) is changing name to the hectopascal (hPa).

When?
From 17th November 2011 the millibar will be replaced by hectopascal.

What is the relationship between hectopascal and millibar?
The units are directly equivalent; it is just the name that is changing in order to bring the UK in line with a change in civilian usage recommended by ICAO.

How will it affect me?
In RT transmissions, “millibar” should be appended to the pressure setting. This will continue, but with “hectopascal” replacing “millibar”. You can also expect to see the change in Met reports from 17th November 2011.

Further info?
Please see 2011DIN03-021 for further information.

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