Landing Dispatch runway wet/ contaminated/ cat III
when runway is wet, contaminated or when CAT III is forecast (or a combination of the above) select WET/CONTAM/CAT III option for an additional 15 % of runway required.
OPT wind calculation factors
OPT will calculate the takeoff performances using 150% of the entered tail wind and 50% of the entered head wind.
OPT will display a warning if winds exceeds 65 knots as per company policy. For cross wind policy refer to Ops Info.
Optimum flaps selection
Flaps which maximize the thrust reduction
OPT
Windshear selection RTG window
Selecting WINDSHEAR will calculate full power (No Derate, No Assumed)
OPT
EFP No emer turn
after takeoff the pilot should maintain runway heading. For straight out departure, the flight-path will be analyzed for obstacles until 30nm from the airport.
OPT
SK-R is shown
SK-R” to the left of V1 results denotes that a credit was taken for grooved runway.
Better braking action
OPT
Landing Enroute extra runway Normal Config
Enroute Landing Distances includes 15% safety margin for Normal configuration (As per EL AL Policy)
OPT line up factors
90/180
Accl go/ Accl stop
90
ACC. Go Distance: 35’
ACC. Stop Distance: 86’
180°
ACC. Go Distance: 64’
ACC. Stop Distance:115’
OPT runway adjustments letters
A- runway length
K- crane
T- temporary
Opt takeoff calculates:
- Tire speed limit weight
- Brake energy limit weight
- Structural (certified) Limit weight
- Field Length is the greatest of the following values:
A. Accl go for 1 engine, to be above the runway 35״ for dry, 15” for wet/ contaminated.
B. Accl stop from rto at v1. Rev for wet/ contaminated, single reverser.
C. 115% net takeoff path 2 engines - Climb gradient- all segments 2.4% for 2nd, see table in OpT manual
- Obstacle limit- clear obstacles 0.8% net path 15 nm or 30 if needed
OPT Landing DISPATCH calculations
Required Climb Gradient.
- Landing Climb Gradient (gear and flaps down, all engines operating) should be at least 3.2%
- Approach Climb Gradient (One engine inoperative, landing gear up) should be at least
– For 2 eng. A/C 2.1%
Select the most restrictive of both climb gradient limitations.
- Calculation is automatically performed for the selected runway with entered wind, temp and pressure and for the longest runway available at the airport with standard conditions. The most restrictive result is displayed.
build-in factor of 67% is taken into account, with an additional 15% for wet or contaminated runway and an additional 15% for autoland.
OPT Landing ENROUTE calculations
Climb gradient: The OPT does not limit calculation for in-flight climb gradient. However if the planned landing weight exceeds the approach or landing climb limits during Landing Enroute calculations a warning message will appear. Note, this warning is only advisory information and should be assessed accordingly by the crew.
- Required Landing Distance: 1500’ flare distance (From 50’ to touchdown).
- Normal configuration - 15% will be added
- Non-normal configuration - no factor is required.
- CAT III and Autoland: Regulations do not specify any additional runway length for CAT III or Autoland. It is EL AL’s policy to add approximately 500 feet to the flare distance any time autoland is selected.
Takeoff thrust limitation
10 minutes
OPT
V speeds FMC Vs. OPT
Fmc uses balanced plus and opt optimum field length.
Fmc all is equal: balanced V1, lineup equal, stopway & clearway equal, checks v1 & vmcg only, no winds, no contamination, no slope.
See opt Manual
OPT/ Landing performance calculations are required when:
- The landing performance is in doubt; or
- Conditions are significantly less favourable than those presumed at time of dispatch ( ); or
- The runway is contaminated; or
- LDA is less than 8,000 ft.
8.3.20.2.8
