PPRuNe Forums - 1000 mb

PPRuNe Forums (https://www.pprune.org/)

- ATC Issues (https://www.pprune.org/atc-issues-18/)

- - 1000 mb (https://www.pprune.org/atc-issues/437364-1000-mb.html)

Have I missed a rule change or have I been wrong for a long time?

I've been saying "wun tousand" ("millibars" optional) but have noticed in the last few months that my local ATSU is saying "wun zero zero zero".

CAP493, but I count find it in CAP413

3.4.2 When transmitting messages containing the following information, each digit shall be transmitted separately:
• Aircraft callsigns;
• Altimeter settings;
• Flight levels (with the exception of FL100, 200, 300 etc. which are expressed as 'Flight Level (number) HUN DRED');
• Headings; • Wind direction and speed; • Pressure settings; • Frequencies; • Transponder codes; • Aircraft speeds.
:8

It'll probably become 'hectopascals' with the next '413 amendment. Don't know why; doesn't 'slip off the tongue' like 'millibars' does it?

L-AB

You have probably been incorrect for quite a while, let's say. It's been a few years since the UK adopted the ICAO procedure, as highlighted above. I must say that it's one that I think unwise, with the potential confusion with 1010, but that's ICAO for you - run by international committees of many people without English as a first language. However, you will notice European pilots being meticulous with their readbacks of "1-0-0-0" - perhaps because of the confusion potential!

UK - hectothingies - probably the next but one amendment to CAP413 - November-ish 2011.

2 s

Quote:

with the exception of FL100, 200, 300 etc. which are expressed as 'Flight Level (number) HUN DRED'

:confused:. Must be a local difference. I thought Flight Level One Zero Zero was the standard.

...shame you can't use "One Bar"...

PS; if it's any help the CAP413 reference is at 1.4.2:

Quote:

1.4.2 All numbers, except those contained in paragraph 1.4.2 b) shall be transmitted by
pronouncing each digit separately as follows:

a) When transmitting messages containing aircraft callsigns, altimeter settings, flight
levels (with the exception of FL100, 200, 300 etc. which are expressed as ‘Flight
Level (number) HUN DRED’), headings, wind speeds/directions, pressure settings,
airspeed, transponder codes and frequencies, each digit shall be transmitted
separately; examples of this convention are as follows:

[...]

b) All numbers used in the transmission of altitude, height, cloud height, visibility and
runway visual range information which contain whole hundreds and whole
thousands shall be transmitted by pronouncing each digit in the number of
hundreds or thousands followed by the word HUNDRED or TOUSAND as
appropriate. Combinations of thousands and whole hundreds shall be transmitted
by pronouncing each digit in the number of thousands followed by the word
TOUSAND and the number of hundreds followed by the word HUNDRED;
examples of this convention are as follows:

I think that it changed in the early part of 2009 (that's when I rememberseeing it in the MATS)

Understand mb will be replaced with Hector Pascall later in 2011 in UK aviation