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.