Performance Safety Factors
Thread Starter
Joined: Nov 2016
Aviation Qualifications: ATPL
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From: Madeira
Performance Safety Factors
Can someone give a good place or a good explanation about the performance factors?
I am struggling to understand when I should use them or not and when should I multiply or divide them.
Kind regards
I am struggling to understand when I should use them or not and when should I multiply or divide them.
Kind regards
Joined: Jan 2011
Posts: 660
Likes: 20
From: England
Performance Planning is all about minimising risk. This could be described as avoiding disappointment. S o a good general approach might be stated as, Be pessimistic and you will avoid disappointment.
If we start our planning by looking at the distances available (TORA, ASDA, TODA) we reduce them by dividing by the safety factors.
If we start by assuming a perfectly flat, dry paved runway, we go through the performance charts to find out how much distance we will need. We then increase this by multiplying by the safety factors, and we then use these pesimistic figures to calculate our maximum take-off mass.
If we start our planning by looking at the distances available (TORA, ASDA, TODA) we reduce them by dividing by the safety factors.
If we start by assuming a perfectly flat, dry paved runway, we go through the performance charts to find out how much distance we will need. We then increase this by multiplying by the safety factors, and we then use these pesimistic figures to calculate our maximum take-off mass.
Joined: Nov 2000
Posts: 4,328
Likes: 74
From: White Waltham, Prestwick & Calgary
The safety factors (i.e. not using more than a certain portion of what is available) are there to ensure that, when you get to your screen height (based on a double decker bus, BTW) there is still, say, 25% of the runway to go, based on the remote probability (10 -6) that one day you might need it.
Joined: Apr 2003
Aviation Qualifications: CPL
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