Pista contaminata

[libero]

Buonasera a tutti, vorrei chiedere un vostro parere in merito all'atterraggio su piste contaminate.
La fattorizzazione da applicare su piste asciutte e' del 60%( 1,67) e in caso di wet 60% ldr + 15% (1,92).
Il manuale dell'aereo in considerazione, nn riporta nessun "numero" da fattorizzare in caso di contaminazione ma solo il classico grafico per atterraggio su piste contaminate da interpolare per arrivare alla distanza di atterraggio.
Ma la distanza ottenuta secondo voi e' gia' fattorizzata o ha bisogno cmq di un ulteriore margine di sicurezza??
Un collega mi ha detto di aggiungere il 15% ma nn ho trovato nessun riferimento per poterlo prendere per vero.
Cosa ne pensate??

[Volorovescio]

Che se il grafico dove interpoli i dati indica contaminated runways i valori dovrebbero essere già fatorizzati.

[Henry VIII]

Di solito i manuali dei costruttori NON sono fattorizzati, e questo è anche riportato in calce alle tabelle.
Per il motivo che la fattorizzazione con i coefficienti esposti (1.67 e 1.92) sono dei requirement che ogni compagnia potrebbe incrementare a proprio giudizio.

[sleepypilot]

Io guarderei al titolo del grafico o tabella.

Distance: distanza di certificazione (zero incrementi, senza reverse)
Lenght: Distance + incrementi.

[I-2021]

Ciao,

di che aereo parli? Comunque, come dicono i precedenti post, dipende dall'intestazione della tabella ed eventualmente da altre note adiacenti.

Saluti.

[89polaris]

ciao libero, se parli del beech 400 ..........guarda qui :

JAR-OPS 1.515. Landing - Dry Runways (See AMC OPS 1.510 and 1.515)
(a) An operator shall ensure that the landing mass of the aeroplane determined in accordance with JAR-OPS 1.475(a) for the estimated time of landing allows a full stop landing from 50 ft above the threshold:
(1) Within 60% of the landing distance available at the destination aerodrome and at any alternate aerodrome for turbojet powered aeroplanes; or
(2) Within 70% of the landing distance available at the destination aerodrome and at any alternate aerodrome for turbo-propeller powered aeroplane, except that;
(3) For Steep Approach procedures the Authority may approve the use of landing distance Data factored in accordance with sub-paragraphs (a)(l) and (a)(2) above as appropriate. based on a screen height of less than 50 ft. but not less than 35 ft. (See Appendix 1 to JAR-OPS 1.515(a)(3).)

(b) When showing compliance with sub-paragraph (a) above, an operator must take account of the following:
(1) The altitude at the aerodrome;
(2) Not more than 50% of the head-wind component or nor less than 150% of the tailwind component; and
(3) The runway slope in the direction of landing if greater than +/-2%

(c) When showing compliance with sub-paragraph (a) above, it must 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 and the ground handling characteristics of the aeroplane, and considering other conditions such as landing aids and terrain. (See IEM OPS 1.515(c).)

(d) If an operator is unable to comply with sub-paragraph (c)(l) above for a destination aerodrome having a single runway where a landing depends upon a specified wind component, an aeroplane may be despatched if 2 alternate aerodromes are designated which permit full compliance with sub-paragraphs (a), (b) and (c). Before commencing an approach to land at the destination aerodrome the commander must satisfy himself that a landing can be made in full compliance with JAR-OPS 1.510 and sub-paragraphs (a) and (b) above .

(e) If an operator is unable to comply with sub-paragraph (c)(2) above for the destination aerodrome, the aeroplane may be despatched if an alternate aerodrome is designated which permits full compliance with sub-paragraphs (a), (b) and (c).

JAR-OPS 1.520. Landing - Wet and contaminated runways
(a) An operator shall ensure that when the appropriate weather reports or forecasts, or a combination thereof, indicate that the runway at the estimated time of arrival may be wet, the landing distance available is at least 115% of the required landing distance, determined in accordance with JAR-OPS 1.515.

(b) An operator shall ensure that when the appropriate weather reports or forecasts, or a combination thereof. indicate that the runway at the estimated time of arrival may be contaminated, the landing distance available must be at least the landing distance determined in accordance with sub-paragraph (a) above or at least 115% of the landing distance determined in accordance with approved contaminated landing distance data or equivalent, accepted by the Authority, whichever is greater.

(c) A landing distance on a wet runway shorter than that required by sub-paragraph (a) above, but not less than that required by JAR-OPS 1.515(a), may; be used if the Aeroplane Flight Manual includes specific additional information about landing distances on wet runways.

(d) A landing distance on a specially prepared contaminated runway shorter than that required by sub-paragraph (b) above, but not less than that required by JAR-OPS 1515(a). may be used if the Aeroplane Flight Manual includes specific additional information about landing distances on contaminated runways.


(e) When showing compliance with sub-paragraphs (b). (c) and (d) above. the criteria of JAR-OPS 1.515 shall be applied accordingly except that JAR-OPS 1.515(a)(l) and (2) shall not be applied to sub-paragraph (b) above.

comunque non ho avuto risposte.....

buon "simulatore"

[libero]

Grazie Polaris, hai capito perfettamente il problema, ti ringrazio!!!!
Trattasi proprio del be400 e hai centrato in pieno il problema.
Buona giornata e grazie cmq a tutti.
Ciao