Work through the graphs a
section at a time – make sure you use a sharp HB pencil!!
Start with Fig 4.7.3
First of all, use of
reference lines - always go to the ref line first, then adjust to the condition .....
So Enter at 650nm .... to the wind REF LINE
.... adjust to 20kt Head wind - make a pencil mark.
Now go up to 16000ft
Pressure Alt (interpolate between 18 and 14) - make a pencil mark.
Now horizontally to the
WEIGHT ref line.
Now we need to adjust to
the 57000 kg condition. - There are 2 adjustment curves - 6000ft and 26000ft -
you need to interpolate 'mid way' .... (the ques altitude is 16000ft). So
at the CONDITION (570000) ... go across to the scale - we actually get 4850 kgs.
For the time, go up to
the second set of PRESSURE ALTITUDE curves, then across to the ISA ref line (at
this point I am at 2.1 hrs).
Now adjust to ISA +15 .... and read the scale .... 2.050hrs, 2hrs 3mins.