Page 67 - Communication IFR_Neat

Braking Action Code
From data collected from operations on compacted snow and ice, an assessment

table has been produced to relate to a measured braking co-efficient to an

estimated braking action and hence to a simple code for braking action. It must
be borne in mind that the description “good” is a comparative value and is

intended to mean that aeroplanes should not experience directional control or

braking difficulties when landing, but conditions would not be as good as on a
clean, dry, runway.

The measured co-efficient may be reported as a 2 digit code without the decimal.

Measured Co-efficient Estimated Code

Braking Action
0.40 and above Good 5
0.39 - 0.36 Medium to good 4

0.35 - 0.30 Medium 3
0.29 - 0.26 Medium to poor 2
0.25 and below Poor 1

Tilbage til indholdsfortegnelse

7. FAILURES AND EMERGENCIES

As with any field of human endeavour flight operations do not always go according
to plan. In the worst case we may have to apply procedures designed to gain

assistance in difficult situations. In this chapter we will consider communications

failure and emergency procedures.

7.1 COMMUNICATIONS FAILURE

Breakdown of communications
Occasionally (rarely) communication between aircraft and ground stations can

break down. It could be that either party has a partial failure (receiver failed,

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