Simbrief plans an even level until ATRUP then switches to an odd level despite the same direction of flight on OKUNO → VATRUP and VATRUP → VAPUP. That’s regardless of the takeoff runway and selected departure procedure, as far as I can tell.
When you plan a low-level flight (OKUNO L5 VAPUP) an odd flight level is used throughout.
I am not sure which ENR document or other chart specifies the Flight Level Orientation System for the UIRs in question but I am confused as to why it would differ between LIRR and LIBB given they are both in Italy?
Flight level selection is also a bit confusing if I mix and match airways and directs:
Hi Tim, specific airways can have their own altitude rules that differ from the containing FIR.
As far as I can tell, eastbound traffic on L5 between OKUNO and VAPUP must use odd altitudes. However the LIRR and LIBB FIR use a north-south rule which results in the opposite structure (northbound flights should be even).
So if you alternate between the airway and DCT, it’ll switch from odd to even altitudes each time you do so.
Actually I don’t get the odd/even change if I e.g. set a specific ZFW, it doesn’t make much sense
https://dispatch.simbrief.com/options/custom?airline=&fltnum=&orig=LIRF&dest=LDSP&altn=LDZA&date=27%20Jan%202025%20-%2002%3A45&basetype=A319&ac_order=registration&type=16458_1724110720469&climb=250%2F300%2F78&cruisemode=CI&cruisesub=0&descent=78%2F300%2F250&fuelfactor=1&callsign=®=3A-MAA&fin=789&selcal=&planformat=ber£s=0&maps=0.5&taxiout=20&taxiin=10&flightrules=i&flighttype=s&altncount=1&navlog=1&etops=1&stepclimbs=1&tlr=0¬ams=0&firnot=0&stehour=3600&stemin=600&origrwy=25&destrwy=23&fl=&pax=0&cargo=&manualpayload=&manualzfw=&contpct=0.03%2F5&resvrule=auto&taxifuel=0.2&minfob=0&minfob_units=wgt&minfod=0&minfod_units=wgt&melfuel=&melfuel_units=min&atcfuel=&atcfuel_units=min&wxxfuel=&wxxfuel_units=min&addedfuel_label=extra&addedfuel=&addedfuel_units=min&tankering=&tankering_units=min&pid=16458&cpt=Tim%20W&fo=C%20SULLENBERGER&dxname=TIM%20W&manualrmk=&route=OKU6A%20OKUNO%20ATRUP%20VAPUP%20VAPU1Y&route_type=&targetfl=28000&targettas=466&disable_tracks=1&force_track=&avoid_airways=&include_fixes=&altnsadv_number=1&altnsadv_radius=150&altnsadv_cig=600&altnsadv_units_vis=m&altnsadv_vis=3000&altnsadv_units_rwy=m&altnsadv_rwy=1600&altnsadv_exclude=&altnsadv_tsfgfz=1&altn_1_id=LDZA&altn_1_rwy=22&altn_1_fl=&altn_1_route=SIRM1V%20SIRMI%20M725%20RUDIK%20RUDI2Y&altn_2_id=&altn_2_rwy=auto&altn_2_fl=&altn_2_route=&altn_3_id=&altn_3_rwy=auto&altn_3_fl=&altn_3_route=&altn_4_id=&altn_4_rwy=auto&altn_4_fl=&altn_4_route=&toaltn_id=&eualtn_id=&etopsthreshold=60&etopsruleselector=&etops_exclude=&etopsentry=&etopsexit=&etopsaltn1=&etopsaltn2=&etopsaltn3=&etopsaltn4=&etopsaltn5=&etopsaltn6=&asp4_snapshot=disabled&debug_zerowind=0&static_id=&manual_acdata=
vs
https://dispatch.simbrief.com/options/custom?airline=&fltnum=&orig=LIRF&dest=LDSP&altn=LDZA&date=27%20Jan%202025%20-%2002%3A45&basetype=A319&ac_order=registration&type=16458_1724110720469&climb=250%2F300%2F78&cruisemode=CI&cruisesub=0&descent=78%2F300%2F250&fuelfactor=1&callsign=®=3A-MAA&fin=789&selcal=&planformat=ber£s=0&maps=0.5&taxiout=20&taxiin=10&flightrules=i&flighttype=s&altncount=1&navlog=1&etops=1&stepclimbs=1&tlr=0¬ams=0&firnot=0&stehour=3600&stemin=600&origrwy=25&destrwy=23&fl=&pax=0&cargo=&manualpayload=&manualzfw=50&contpct=0.03%2F5&resvrule=auto&taxifuel=0.2&minfob=0&minfob_units=wgt&minfod=0&minfod_units=wgt&melfuel=&melfuel_units=min&atcfuel=&atcfuel_units=min&wxxfuel=&wxxfuel_units=min&addedfuel_label=extra&addedfuel=&addedfuel_units=min&tankering=&tankering_units=min&pid=16458&cpt=Tim%20W&fo=C%20SULLENBERGER&dxname=TIM%20W&manualrmk=&route=OKU6A%20OKUNO%20ATRUP%20VAPUP%20VAPU1Y&route_type=&targetfl=28000&targettas=466&disable_tracks=1&force_track=&avoid_airways=&include_fixes=&altnsadv_number=1&altnsadv_radius=150&altnsadv_cig=600&altnsadv_units_vis=m&altnsadv_vis=3000&altnsadv_units_rwy=m&altnsadv_rwy=1600&altnsadv_exclude=&altnsadv_tsfgfz=1&altn_1_id=LDZA&altn_1_rwy=22&altn_1_fl=&altn_1_route=SIRM1V%20SIRMI%20M725%20RUDIK%20RUDI2Y&altn_2_id=&altn_2_rwy=auto&altn_2_fl=&altn_2_route=&altn_3_id=&altn_3_rwy=auto&altn_3_fl=&altn_3_route=&altn_4_id=&altn_4_rwy=auto&altn_4_fl=&altn_4_route=&toaltn_id=&eualtn_id=&etopsthreshold=60&etopsruleselector=&etops_exclude=&etopsentry=&etopsexit=&etopsaltn1=&etopsaltn2=&etopsaltn3=&etopsaltn4=&etopsaltn5=&etopsaltn6=&asp4_snapshot=disabled&debug_zerowind=0&static_id=&manual_acdata=
…note that I am using a custom airframe with an altitude offset (IIRC -2000), not that it should matter in theory.