Destination Alternates Flashcards
What are the derived weather minimums required for an alternate?
For airports with at least one operational navigational facility providing a straight-in non-precision approach procedure; or CAT I precision approach; or, when applicable, a circling maneuver from an IAP.
•Add 400 ft. to MDA(H) or DA(H), as applicable
•Add 1 SM (1,600 m) to the landing minimum
For airports with at least two operational navigational facilities providing a straight-in approach procedure to different suitable runways.
•Add 200 ft. to higher DA(H) or MDA(H) of the two approaches used
•Add ½ SM (800 m) to the higher authorized landing minimum/ of the two approaches used
No flight may continue to an airport to which it has been dispatched unless the weather conditions at an alternate airport specified in the Dispatch Release are forecast to be at or above the alternate minimums specified.
When are two alternates required?
When the weather conditions forecast for both the destination and the alternate airport are less than 600 ft. ceiling and less than 2 miles visibility (defined as “marginal” weather), at least one additional alternate must be designated, dispatched using exemption 3585 or dispatched using NGRVR.
What distance and flight profile does Dispatch use to calculate fuel required for the alternate?
A distance to the alternate based on a great circle route plus a minimum distance bias of 30 NM. The fuel burn is based on forecast winds aloft and is calculated using the aircraft weight at the arrival airport; it includes sufficient fuel for climbing to altitude, LRC to the alternate, a normal profile descent, and landing.
Regarding domestic flights, how much flight time does FAR RESERVE fuel provide at the alternate?
45 min of endurance time at the planned destination or a planned alternate after a diversion. Based on LRC at the TOD altitude.
What resource can be used to determine fuel requirements for an international flight?
IFOM Flight Planning
What value does PWB auto-populate into the RESERVES block (4L) on the FMC PERF INIT page?
Defaults to 4.4 (4,400 lb). Populates with the sum of FAR RESERVE and ALTERNATE fuel as listed on the Dispatch Release. The RESERVES value is never less than 4
You are filed on a domestic flight from MDW to ALB. The weather in ALB is forecast to be 0000KT P6SM BKN015 for 1 hour prior to and after your ETA.
Do you need a destination alternate?
Yes, unless dispatched under Exemption 15466 (1-1-2 or 1-1-3 Rules).
You are filed on a domestic flight from MDW to ALB. The weather in ALB is forecast to be 0000KT P6SM BKN015 for 1 hour prior to and after your ETA.
If RW 1/19 is NOTAM closed is an alternate required?
Yes, since RW 10/28 does not have a CAT I ILS Exemption 15466 (1-1-3 Rule) cannot be used.
