ils cat1
hello every one,
airport authorities announces in due time(via atc &/or notam):" ils backup power source unavail, ils uncategorised "& weather does not cooperate, e.g. 7km, 200ft ovc.
what, as pilot, do you do?
1) look up your sops:jar-ops1 manual part A chapter 8: minimas & tables with inop ground equipement. it says: no ils(cat 1/2/3) allowed with back up power source inop.
2)considering fuel options & before deciding a diversion, what can you do to stay legal, make your life more easy & try an appraoch?
question: do i have the wx minimas to start/continue the non precision approach(npa)?
answer: yes, with 7km vis you can suppose you are above min required rvr.
ceiling? ceiling is only a legal consideration at the flight planning stage for a npa(so, if your are in the briefing room, you are below minima & you need a second alternate enroute or at destination with upgraded minimas in order to depart to your destination).
but to continue our case, suppose the notam is promulgated when you are already airborne & you are informed in due time by atc or atis of the situation.
3) so you start your set up & brief + double brief(ryr pilots will understand)+monitored approach(f/o flies the approach with the autopilot/capt lands the aircraft)
technical set up e.g. for b737ng:
autopilot mode lnav & vertical speed( vnav not allowed, only 1 fms)
minimas: mda for npa.
radio aids: the ils of course, but only as an information source. we also suppose the ils front course & npa inbound course are aligned with the landing rwy.
4)conclusions: the wisdom to do all above, is at pilots discretion, because with a solid ovc at 200ft agl & npa mdh's of circa 500ft agl, there is a great possibility of a missed approach. i only tried to explain the legal/technical/practical implications for this example.
a last thing: operators define minimas according to jar ops rules & must at all times be equal or higher than state minima's.