RWY condition Assessment Matrix For Ldg

[che ci dò che ci dò!]

On A320 FCOM, the new runway condition assessment Matrix For Landing shows a column with the Related Landing Performance. The right part of the column shows the relevant "Level" (read braking Action), the left part of the column a code from 6 to 1. Does any of you know what does that code mean?

[gAMbl3]

Those are runway condition codes given on basis of friction coefficient of the runway.

[South Prince]

Hi gamble3, you might be correct but where is the reference to your statement in the FCOM ? Can't find it! But I might be temporarily blind.

[safetypee]

I assume the question refers to the matrix below:

http://i39.tinypic.com/20gnpy.jpg

The numbers (1-5) relate to the ICAO code for expressing the friction characteristics of wet and precipitation covered runways. (ICAO Annex 14. ATT A, para 6). Code 6 is used for dry.
The codes relate to the estimated braking action (PIREP / ESF) and the observations on deceleration; however, the Airbus observations differ slightly from some other texts, and might represent industry's recent thoughts on runway condition reporting – Operational Landing Distances (OLD) and TALPA.

The code / runway descriptions should not be based on measured friction as it may be unreliable. Similarly PIREPS should only be used for downgrading a code due to their inherent subjectivity and dependence on aircraft type and pilot experience.

Refs
http://www.ukfsc.co.uk/files/Safety%20Briefings%20_%20Presentations/Airbus%20Safety%20First%20Mag%20-%20August%202010.pdf and Safety First 12 (http://www.scribd.com/doc/62707861/Safety-First-12)

[South Prince]

Thanks for reminding the safety booklet. Another number for lawyers and examiners. anyway after many years they made it a bit more clear but still there is no legend that says what that number is.

[Fly3]

In the airlines I am involved with the matrix as above is included in the In Flight Performance section of their QRH's.

[safetypee]

South Prince. This has nothing to do with lawyers or examiners; it’s about personal responsibilities for safety and professional knowledge.
The code – MONTE code, is defined by ICAO and used in SNOWTAMS; it may also be used by ATC in reporting the estimated braking action, with or instead of the normal ‘good’, ‘medium’, etc.
Individuals, Operators, and National Authorities are expected to know this.

Read the Airbus information again (refs #4), it lists the codes under runway condition with descriptions of what might be expected; this is the legend.
Note that this matrix refers to the TALPA proposals but appears to be similar to the FCOM/QRH version.
Also note the text:-
The information to be transmitted to the flight crew includes:
The runway code for each third of the runway
The type and depth of the contaminant and percentage of coverage in 25% increments
PiREPS when available.

Another view of OLD and the codes - https://www.vnv.nl/commissiepub/4450

[South Prince]

May I then suggest Airbus to add a little note stating what "Code" means? So as to avoid any misunderstanding.