Hello everybody. I have a problem with the sample MEP1 exercise printed on page 5.23 of Flight Planning section. The exercise asks to find the minimum ramp fuel for a trip.

No problem in finding taxi, climb, descent and 45' reserve fuel: I checked that my calculations are correct (according to the sample solution).

I found a little difference (17lbs total) in trip and contingency fuel.

The problem is related to TAS: according to the CAP697 graph (MEP1 section, page 6), flying at 65% power at a PA of 8500ft and OAT +8°C (+10°ISA) gives a TAS=174KT. The sample solution actually states that TAS should be 169KT.

I can't understand from where that 169KT comes out!

According to the graph, my only explanation is that 169KT is the correct value for flying at 65% power at 8500ft, with OAT=-13°C (like in the graph example).

Please help me!

Many thanks

No problem in finding taxi, climb, descent and 45' reserve fuel: I checked that my calculations are correct (according to the sample solution).

I found a little difference (17lbs total) in trip and contingency fuel.

The problem is related to TAS: according to the CAP697 graph (MEP1 section, page 6), flying at 65% power at a PA of 8500ft and OAT +8°C (+10°ISA) gives a TAS=174KT. The sample solution actually states that TAS should be 169KT.

I can't understand from where that 169KT comes out!

According to the graph, my only explanation is that 169KT is the correct value for flying at 65% power at 8500ft, with OAT=-13°C (like in the graph example).

Please help me!

Many thanks

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