PPRuNe Forums Flight Planning *issues*

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 1st Apr 2004, 21:36 #2 (permalink) Join Date: Dec 2003 Location: Derby Age: 34 Posts: 339 Eh Did you forget to interpolate between the FL levels as well as the temp difference? Temp is +11 at 7000 feet. It should be -1, since it's not then it's a total difference of 12 degrees. Using values for the ISA 8000 and 6000 you find the GPH AT 7000' to be >10.65 ISA+20 at 8000 and 6000 the GPH AT 7000 is >10.35 Interpolation between the two figures gives you a GPH of 10.47 GPH (10.65-10.35 = .30/20 = 0.015 0.015 x 12 degrees = 0.18 subract .18 from 10.65 and you get 10.47) Using time to destination and Fflow I find that I need 33.5 Gallons. 33.5 x 6 is 201 and 30% of 201 is 60.3 that makes it 261.3 pounds. Now I have to add the 6 pounds and the 10 pounds and that makes it 277.3. The answer is between 286 and 268 and so I'd probably go for answer A. I think there's a hitch to the question though.
 1st Apr 2004, 22:17 #3 (permalink) Join Date: Dec 1998 Location: Escapee from Ultima Thule Posts: 3,701 Unless the JAR exam provides climb fuel, or expects you to use cruise rates, have you considered the fuel used in the climb? 500' dept AD elevation would then be a factor in your climb fuel.
 2nd Apr 2004, 08:12 #4 (permalink) Join Date: Mar 1999 Location: UK Posts: 609 My interpolation concurs with yours, 1/60... I got 11C and 63lb/h (so, call it 10.5GPH). However my figures are: (in lb) Start up & taxi = 10 Trip = 3.2 x 63 = 201.6 Climb = 3 mins @ 63lb/h = 3.2; + 1USG (=6.5lb) = 9.7 Reserve - 30% of trip = 0.3 x 201.6 = 60.5 Descent = 10 mins x 63 = 10.5 So total = 292.3lb. This is closest to (A) 286lb... which is marked as the correct one. But my answer being that far off suggests that there is something amiss in my calculations. Tinstaafl.... climb fuel is not provided. Neither is distance ADEP - ADES. Which is why I am lost! This feedback is from a school that's an anagram of "Oxdorf".
 3rd Apr 2004, 19:57 #6 (permalink) Join Date: Dec 2003 Location: Derby Age: 34 Posts: 339 I've seen this question in the Abacus question bank but I wouldn't worry about it. This question is pretty elusive and has probably been rewritten or taken out of the bank.

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