PPRuNe Forums - what is one step down planning

PPRuNe Forums (https://www.pprune.org/)

- Flight/Ground Ops, Crewing and Dispatch (https://www.pprune.org/flight-ground-ops-crewing-dispatch-39/)

- - what is one step down planning (https://www.pprune.org/flight-ground-ops-crewing-dispatch/257911-what-one-step-down-planning.html)

what is one step down planning

Hello guys, today I heard, that you have to plan an alternate in case of destination wx is below minimum at the eta with the one step down or one step below or one step under method. It shall mean, if there is at the alternate an precision apch (ils) and an e.g. vor apch you have to assure that the wx at eta (altn) is sufficient for an apch that is (with respect to precision) one step under the "best precision apch". is that correct? where can you read more about it? is it a law??

yours lusthansa!

check the operations manual of your company or jar ops 1.255...
:}
cheers
ralle
http://www.fct.ccoo.es/aereo/pdf/leg...s/jar-ops1.pdf

To expand this topic further:

JAR-OPS 1.295 Selection of aerodromes states:
"(d) An operator must select two destination alternates when:
(1) The appropriate weather reports or forecasts for the destination, or any combination thereof, indicate that during a period commencing 1 hour before and ending 1 hour after the estimated time of arrival, the weather conditions will be below the applicable planning minima; or
(2) No meteorological information is available."
While JAR-OPS 1.297 Planning minima for IFRflights says:
"(b) Planning minima for destination and destination alternate aerodromes. An operator shall only select the destination aerodrome and/or destination alternate aerodrome(s) when the appropriate weather reports or forecasts, or any combination thereof, indicate that, during a period commencing 1 hour before and ending 1 hour after the estimated time of arrival at the aerodrome, the weather conditions will be at or above the applicable

planning minima as follows:...

So, I read this many times and I still do not understand :{ if we have to have fuel for new (provisional) destination where the weather is good + alternates for provisional destination or fuel for original destination (with bad wx) + 2 alternates.

If anybody could clear this for me I would appreciate it very much

To expand this topic further:

JAR-OPS 1.295 Selection of aerodromes states:
"(d) An operator must select two destination alternates when:
(1) The appropriate weather reports or forecasts for the destination, or any combination thereof, indicate that during a period commencing 1 hour before and ending 1 hour after the estimated time of arrival, the weather conditions will be below the applicable planning minima; or
(2) No meteorological information is available."
While JAR-OPS 1.297 Planning minima for IFRflights says:
"(b) Planning minima for destination and destination alternate aerodromes. An operator shall only select the destination aerodrome and/or destination alternate aerodrome(s) when the appropriate weather reports or fore-casts, or any combination thereof, indicate that, during a period commen-cing 1 hour before and ending 1 hour after the estimated time of arrival at the aerodrome, the weather conditions will be at or above the applicable

planning minima as follows:...

If anybody could clear this for me I would appreciate it very much

JAR-OPS 1 Subpart D,

JAR-OPS 1.297(b)(2) (continued)

Table 1 Planning minima – En-route and destination alternates

Type of approach........................Planning Minima

Cat II and III..............................Cat I (Note 1)

Cat I.........................................Non-precision (Notes 1 & 2)

Non-precision.............................Non-precision (Notes 1 & 2) plus 200 ft/1 000m

Circling......................................Circling

Page 1-D-8 in my copy.