Per come la vedo io, se l'estimated landing weight è maggiore del landing field length limit weight senza vento, l'aereo può essere dispacciato (si dice così in italiano?CAT.POL.A.230 Landing — dry runways
a) The landing mass of the aeroplane determined in accordance with CAT.POL.A.105(a) for the estimated time of landing at the destination aerodrome and at any alternate aerodrome shall allow a full stop landing from 50 ft above the threshold:
1) for turbo-jet powered aeroplanes, within 60 % of the landing distance available (LDA); and
2) for turbo-propeller powered aeroplanes, within 70 % of the LDA.
b) For steep approach operations, the operator shall use the landing distance data factored in accordance with (a), based on a screen height of less than 60 ft, but not less than 35 ft, and shall comply with CAT.POL.A.245.
c) For short landing operations, the operator shall use the landing distance data factored in accordance with (a) and shall comply with CAT.POL.A.250.
d) When determining the landing mass, the operator shall take the following into account:
1) the altitude at the aerodrome;
2) not more than 50% of the headwind component or not less than 150 % of the tailwind component; and
3) the runway slope in the direction of landing if greater than ± 2 %.
e) For dispatching the aeroplane it shall be assumed that:
1) the aeroplane will land on the most favourable runway, in still air; and
2) the aeroplane will land on the runway most likely to be assigned, considering the probable wind speed and direction, the ground handling characteristics of the aeroplane and other conditions such as landing aids and terrain.
f) If the operator is unable to comply with (e)(1) for a destination aerodrome having a single runway where a landing depends upon a specified wind component, the aeroplane may be dispatched if two alternate aerodromes are designated that permit full compliance with (a) to (e). Before commencing an approach to land at the destination aerodrome, the commander shall check that a landing can be made in full compliance with (a) to (d) and CAT.POL.A.225.
g) If the operator is unable to comply with (e)(2) for the destination aerodrome, the aeroplane shall be only dispatched if an alternate aerodrome is designated that allows full compliance with (a) to (e).
) ammesso che i due alternati soddisfano i requisiti di dispaccio (60% della LDA) senza vento e che il componente di headwind permetta, in fase di planning, di atterrare entro il 60% della LDA all'aeroporto di destinazione. Ora, quello che davvero mi porta in confusione è la parte in grassetto. Dopo il decollo, facciamo a meno dei margini maggiori presenti in sede di planning e infatti la normativa fa riferimento a CAT.POL.A.105(a) che dice:
La mia interpretazione è che il PIC deve controllare di essere in grado di atterrare con il vento presente entro il 60% al momento poco prima di lasciare i blocchi. Una volta dopo il decollo, l'obbligo di applicare il margine del 60% decade e si fa riferimento soltanto ai dati enroute, che nel mio caso applicano anche un margine del 15% per configurazioni normali.(a)The mass of the aeroplane:
(1)at the start of the take-off; or
(2)in the event of in-flight replanning, at the point from which the revised operational flight plan applies,
shall not be greater than the mass at which the requirements of the appropriate chapter can be complied with for the flight to be undertaken. Allowance may be made for expected reductions in mass as the flight proceeds and for fuel jettisoning.
