VNAP Procedures

[mathy]

heavier effort

Just to check, the usual web reference is:

http://www.boeing.com/commercial/airports/acaps/737.pdf provided that no-one gives absolute verity to the info for real operations. It is very much a distillation for civil engineers but better than a poke in the eye with a sharp stick.

Despite the Boeing disclaimer in the above document I took a 150nm alternate, 30min hold, 6% reserves and no go around because that seemed to give the best match between my laptop and the Boeing -700 performance graph.

From the laptop long range cruise at FL360 is M0.774 and the climb schedule I took was 250/295/M0.75 with the crossover circa 28,000ft.

Distance in still air ISA is 2,100nm with 1,1670kg fuel of which 1,150kg is diversion, 1,150kg hold and 700kg for a nifty descent. This basically matches up to BOAC’s wish for a 70 tonne aircraft at brake release.

Then I hit <GO> on the BLT and it came up with 137nm climb in 21 minutes along with a lot of other stuff which I simplified. For example at the 1,500ft and 10,000ft acceleration points I took a round average of speed and tidied up the RoC figures. Using the formula for time increments given in my earlier answer I created this table, which is close enough I think. Therefore I hope this is helpful in trying to imagine where that 737-700 goes in terms of elevation, time and distance.

Elev ft RoC Time Inc GS Dist
AMSL fpm mins kts nm
35 2400 0 153 0.00
1500 2800 0.56 206 1.68
10000 2700 3.09 314 13.39
28000 1300 9.4 446 59.53
36000 600 8.84 430 64.53
Total 21.89 mins Total 139.13 nm