- Mon Dec 17, 2018 10:47 pm
Alex Seeberger 1129791 wrote:Regardless of the required visibility to initiate or continue an approach, at minimums the pilot must be reasonable sure the visibility is within limits, in their opinion to continue to landing. How many runway lights are required if the minimums are 550 meters? Can you reliably count that at 150 knots during a night approach:)
You're comparing apples and oranges.
The visual references required at DH on approach are, of course, very different to those required for an LVTO and clearly defined (at least in EASA land -- I assume also in the AIM). For a CAT I approach, that would basically be 'something' (at least one of the runway, runway threshold markings, runway edge lights, elements of the approach lighting system, PAPIs, touchdown zone markings/lights etc). For CAT II, at least three consecutive lights including a lateral element are required, CAT IIIA requires three lights, IIIB with a DH requires one light, and IIIB no DH no visual references at all are required before touchdown. I believe the USA is similar in this regard.
For takeoff, legally (EASA):
(b) for an LVTO with an RVR below 150 m but not less than 125 m:
(1) high intensity runway centre line lights spaced 15 m or less apart and high
intensity edge lights spaced 60 m or less apart that are in operation;
(2) a 90 m visual segment that is available from the flight crew compartment at
the start of the take-off run; and
(3) the required RVR value is achieved for all of the relevant RVR reporting
Without counting lights, how can you ensure requirement (2) above is satisfied as it is specific to the aircraft?
I'm not sure what the FAA rules are regarding takeoff minima as I can't find a reference in the AIM and I don't know my around the FARs but presumably there must be some sort of visual reference requirement?