Approach ban & Flex/Derated Thrust
 

Un paio di domande per chi ha voglia e tempo di rispondere:

1. Che significa “Approach ban” ?

2. Che differenza c’è tra FLEX THRUST e DERATED THRUST take off (su Airbus)?
Flex Thrust is not allowed with runway contaminated but operators, to save the engine life, can use Derated Thrust. The main difference between FLEX and DERATED is that in the case of flexible thrust it is allowed to recover maximum thrust (TOGA), whereas it is not allowed to recover maximum thrust at low speeds (as long as the a/c is below flaps retraction speed) in case of Derated thrust.

Ok, ma in termini pratici, come faccio ad effettuare un decollo in derated thrust su Airbus?

Ste

Approach Ban:

A commander may commence an instrument approach regardless of the reported
RVR or visibility but the approach shall not be continued beyond the Outer
Marker, or equivalent position, if the reported RVR or visibility, as applicable, is
less than the published minima.
Where no outer marker or equivalent position exists, the pilot-in-command shall
make the decision to continue or abandon the approach before descending below
1000 ft above the airfield on the final approach segment.
If, after passing the outer marker or equivalent position, the reported
RVR/visibility falls below the applicable minimum, the pilot-in-command may
continue the approach to DA or MDA and the landing may be completed
provided that the required visual reference is established.

Derated Thrust:

Se ad esempio il tuo airbus e' rated a 27k lo si puo' "deratare" chesso' a 24k (e' come se ritoccassi la centralina della tua macchina e ne limitassi i giri del motore) e per quella data condizione (contaminated RWY) avrai comunque la massima potenza disponibile per il rating specifico (sempre schiacciando l'acceleratore al massimo per rimanere in ambito automobilistico).
Per quanto riguarda il Flex (o Assumed temperature thrust come dice Boeing) e' come se tu non schiacciassi a fondo l'acceleratore riservandoti pero' di farlo in caso di bisogno,procedura pero' non permessa su RWY contaminate.

Se ad esempio il tuo airbus..
 

Se ad esempio il tuo airbus A330 o A340... la possibilità di Derated Thrust non è presente nella famiglia A320:ok:

Assumed temperature (=FLEX) and Derated
 

An assumed/ flex temp is a performance calculation technique used to find the takeoff EPR/N1 setting for aircraft's take off weight .
Assumed /flex temp takeoff thrust is limited to a 25% reduction (you can used only in certain condition eg. not with rwy contaminated)of takeoff thrust or selected climb thrust whichever is the greater value .
Derated value or D-TO is a fixed percentage ,usually 90% or 80% of takeoff available what you can obtain in certain airplane type selecting
D-TO 1 or D-TO 2 .
There are two two main reasons for using a reduced or assumed/flex takeoff thrust:
1 To protect engine life and improve engine reliability
2 to reduce the noise generated by the aircraft
BY:ok:

grazie mille ragazzi!!