Wx and Dispatch Flashcards
Destination inflight
At ETA landing minima.
To proceed required weather at detonation above landing minima or destination alternate above planning minima.
Preflight:
Destination alternate.
ERA 3%.
Takeoff alternate
ETA +- 1hr Planing minima Cat II or III — cat I Cat I — non precision Non precision — +200ft + 1000m Circling — circling Wind limitation apply (gust do not apply)
Inflight:
Destination alternate.
ERA 3%.
Takeoff alternate
At ETA Planing minima Cat II or III — cat I Cat I — non precision Non precision — +200ft + 1000m Circling — circling Wind limitation apply (gust do not apply) To proceed required weather at detonation above landing minima or destination alternate above planning minima.
Destination alternate not required - preflight and in flight
Max 6hr At ETA 2 separate runways 2000ft 5000m or 2500 for circling app. Pre-flight - by company notam In-flight all destinations airports
Destination below minima (closed destination) - preflight.
1+- hr
2 destination alternate above planning minima.
Destination below minima (closed destination) - inflight.
To proceed required weather at detonation above landing minima or destination alternate above planning minima.
Use of weather radar
Below 20,000ft Lateral separation of 10nm
Above 20,000ft Lateral separation of 20nm
At least 5000 above
NOSIG
no significant changes in reportable weather elements are expected during the 2 hours following the reported observation.
CAVOK
no significant weather, the visibility is 10 km or greater, and no clouds below 5,000 ft or MSA.
NSW
weather or obscuration listed in the previous group is no longer expected to occur.
Cross wind: Landing
Dry
Braking action good (any precipitation)
Medium
Dry 40 Good 40 Medium to Good 35 Medium 25 Dry runway, side slip only is not recommended with crosswind above 20 knots - landing using flaps 30.
Runway decoding
R99
///99//
R88//////
R99-Valid report is not available previous report will be repeated.
//99/// nonoperational due to runway clearance in progress.
R88/ all runways contaminated reports not available
Cross wind: Takeoff
Dry 34
Good 25
Medium to Good 22
Medium 20
Cold weather sources
OMA 8.3.10, De-Icing 8.2.5
FCOM supplementary 3&16
Ice, what is aloud
Lower wing:
no ice or frost on leading edges or control surfaces
• Ambient air temperature is at or above +4°C, +39°F
• There is no precipitation or visible moisture
• Tank fuel temperature is at or above -16°C
Or if conditions are not met 3mm.
Upper wing:
• The CSFF on the wing tank upper surfaces is only within the
lines defining the permissible CSFF area with no ice or frost on
the leading edges or control surfaces
• Ambient air temperature is at or above +4°C
• There is no precipitation or visible moisture
• Tank fuel temperature is at or above -16°C,