Rory Salisbury – Dispatcher/Dispatch Trainer Mesa Airlines Rory Salisbury – Dispatcher/Dispatch Trainer

Mesa Airlines First of all, we at Mesa Airlines would like to extend a warm thank you to the National Weather Service.

Mesa Airlines Approx. 200 aircraft in our fleet Category one airline Group 1 and group 2 aircraft

Mesa Airlines Approx. 80 % of a dispatchers job is centered around weather and weather products.

Mesa Airlines The FAA towers / centers along with other FAA programs will try to follow the NWS forecasts. The AADC are based on forecast and traffic.

Mesa Airlines FAR 121.619 – Alternate airport for destination (1) The ceiling will be at least 2,000 feet above the airport elevation; and (2) Visibility will be at least 3 miles.

Mesa Airlines 121.617 – Alternate Airport for Departure Must meet alternate weather minimums

Mesa Airlines FAR 121.625 – Alternate Airport weather Minimums FAA mandates that all part 121 carriers create alternate weather minimums based on a method that is approved in the certificate holders Operations Specifications (Ops. Specs)

Mesa Airlines Mesa Airlines is authorized to derive alternate weather minimums via the 1 navaid, 2 navaid rule.

Mesa Airlines One navaid rules state that for airports with only one navigational aid and or one runway authorized for our operations, Mesa Airlines will add 400’ to the HAT and 1sm to the lowest authorized category 1 landing minimums for the airport in use.

Mesa Airlines The two navaid rule states that if there are two separate operational navaids with two different frequencies and two separate runways suitable for our type operations, then we will add 200’ to the HAT and ½ sm to the lowest suitable category one landing minimums for the airport in use.

Mesa Airlines Whenever a circling maneuver is required one navaid rule will be used.

Mesa Airlines For example KPSP minimums for speed category C and D is 1936’ & 3sm. So for the sake of an alternate with only a circle to land approach the weather min’s would be 2400’ and 4sm

Mesa Airlines FAR 121.599 – States that no aircraft will be dispatched unless the dispatcher for that flight is thoroughly familiar with all weather conditions that are being reported or forecasted for the entire route of flight to be dispatched.

Mesa Airlines Mesa Airlines lowest category one landing minimums are ½ sm and 200’ HAT

Mesa Airlines Examples of go or no go decisions based on weather forecast alone

Mesa Airlines Exemption 3585 100% landing minimums must be forecast for the time of arrival in the main body of the forecast. If 50% of landing minimums are forecasted in a tempo or conditional statement then we may depart for destination under exemption 3585

Mesa Airlines Below is an example of a “go” situation with standard alternate arrival time of 2120z; TAF KDFW 051125Z 051212 18007KT P6SM FM1700 18015KT 1SM OVC020 FM0100 18009KT P6SM SCT300

Mesa Airlines Below is an example of a “no” go forecast with arrival time of 0801z Updated 1355 UTC 05 Dec TAF KEUG 050555Z 050606 VRB03KT P6SM FM0800 00000KT 1/4SM FG BKN001

Mesa Airlines Below is an example of a “go” situation based on exemption 3585 arrival time1830z; TAF KBWI 061724Z 161818 15014G20KT 3SM -SHRA BR SCT012 OVC025 TEMPO 1821 VRB03KT 1/4SM -RA BR BKN012 FM2100 17014G28KT 4SM -SHRA BKN025 OVC035

Mesa Airlines Under exemption 3585 two alternates will be given. Both alternates must meet alternate weather minimums.

Mesa Airlines Area forecasts It is common for a dispatcher to have an aircraft with inoperative de-ice or anti-ice equipment, area forecasts help determine “go” or “no-go” situations

Mesa Airlines We at Mesa Airlines would like to, again thank the National Weather Service for allowing us the time to speak here today.

Mesa Airlines Rory Salisbury rory.salisbury@mesa-air.com 623-326-6865