Lister,
In this example, AirQuiz is incorrect.
However, the Safety Sense leaflet is also incorrect.
Safety Sense Leaflet 7 can be found in
LASORS 2006 - click on the link and scroll to page 417 of the PDF file.
The table of safety factors is on page 7 of the leaflet, which is page 423 of the PDF file.
This table gives, for short grass, an increase in take-off distance of 20%, a factor of 1.2. But the question asks about
landing distance. And the increase in landing distance given is 15%, or a factor of 1.15, which is answer B.
(There is also a note that, in some aircraft such as those without brakes, grass can decrease landing distance, but you should factor the increase unless you are very conversant on type. Not relevant to the question, but interesting nonetheless!)
However, on the previous page, in the section labelled "Safety Factors" (which starts on page 5 and runs on to page 6), it gives an example of a take-off calculation, and it says: "The same aeroplane in still air from a dry, short- grass strip (factor of 1.2)". This is a direct contradiction of the following page.
So, to try to resolve the problem, I had a look at the place where the Safety Sense Leaflet information comes from:
AIC 67/2002 (Pink 36). (Registration to the AIS website is required.) The answer is found on page 3, paragraph 7.6:
Guide line factors: for dry grass (under 8 inches) the landing distance will be increase by 20% (a factor of x 1.20).
Hope that clears that one up!
FFF
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