Program Profile - OpTempo

The Operational Tempo sub-sector allows flying-related data to be specified for each environment. There are two alternative input modes available to specify aircraft flying hours, either as average flying hours per aircraft per month or as the number of hours flown per year in each environment. The Average Flying Hours and Environment Flying Hours radio buttons are used to switch between input modes.

Average Flying Hours

The Average Flying Hours option allows flying hours to be specified as an average per aircraft; the flying hours in a year for the environment will vary with the number of aircraft that have been allocated to the environment. This is the same as the approach used in OSCAM Air v3, except that a maximum flying hours input has been added that provides an upper limit on the number of hours that an aircraft can fly in a month.

OpTempo - Average Flying Hours option

Program Profile OpTempo tan showing the Average Flying Hours option

The average number of flying hours per month is specified in the right-hand panel for deployed and non-deployed aircraft in each environment. A maximum flying hours per month is also specified. There is an option for aircraft to fly more than the average number of hours to make up for a shortfall in aircraft; the maximum flying hours limit ensures that the aircraft never fly above that limit in any month. If the Avg Flying Hours input is set to be higher than the Max Flying Hours input then the Max Flying Hours input will be highlighted in red to indicate that this limit will be hit even if there is no aircraft shortfall.

The table on the left allows the percentage split between deployed and non-deployed aircraft to be specified for each year. The table also has a column that shows the number of aircraft allocated to the environment as an average over the year. This average takes account of any changes in allocation over the year due to aircraft being introduced into service or retirements from service. The graph on the upper right-hand side shows the number of deployed and non-deployed aircraft specified for the environment each year.

There are radio buttons that define how shortfalls in available aircraft will be dealt with. These will be used if the number of aircraft available is less than the number of aircraft allocated. Different rules can be specified for each environment.

Allocation of Deployed Aircraft has options to Meet Planned Deployed Number or Maintain Percentage Split. This selects whether any shortfall in available aircraft is only removed from the non-deployed allocation or whether it is applied to both deployed and non-deployed.

Deployed Aircraft Flying Hours has options to Meet Planned Flying Hours or Maintain Flying Hours per Aircraft. The first option determines the number of hours that would be flown if all allocated deployed aircraft were available and then increases the flying hours for each aircraft to make up for any shortfall, up to the maximum aircraft flying hours limit. The second option keeps to the specified average flying hours per aircraft, and so a shortfall in aircraft would mean fewer hours being flown for the environment.

The Non-Deployed Flying Hours option works in the same way as for deployed aircraft but gives the option of using different rules for deployed and non-deployed aircraft.

These options can have a major impact on the number of hours flown in a year if there are aircraft shortfalls. An interactive explanation of the switch settings can be viewed from OSCAM Air by clicking on the Example button underneath the switches on the OpTempo form.

Environment Flying Hours

The Environment Flying Hours option allows deployed and non-deployed flying hours targets to be set on an annual basis for each environment. The allocated aircraft will fly the required number of flying hours to meet the environment targets. This representation is a new feature of OSCAM Air v4 and allows a flying hours plan to be entered for each environment.

OpTempo - Environment Flying Hours option

OpTempo tab with Environment Flying Hours option selected

The table on the left allows the percentage split for deployed aircraft to be specified along with the targets for deployed and non-deployed flying hours. The table also has a column that shows the number of aircraft allocated to the environment as an average over the year. This average takes account of any changes in allocation over the year due to aircraft being introduced into service or retirements from service. The graph on the right shows the average monthly flying hours that would be required per aircraft to meet the deployed and non-deployed flying hours targets. The maximum monthly flying hours are also shown on the graph.

The Max Flying Hours inputs show the maximum monthly flying hours per aircraft. If the graph shows that the required average flying hours per aircraft are above the maximum for any years then the target flying hours for the environment will not be met, even if all allocated aircraft are available. The data in the table for those years will be displayed in red to highlight where the problems are.

When the simulation is run, aircraft may be temporarily unavailable due to PDMs, emergency repair and modernization or may leave service early due to attrition, flying hours related retirement or early retirement due to emergency repair. The diagnostic chart on the input form does not take account of these potential causes of aircraft shortfall, so that it is possible that not all of the flying hours can be achieved in the simulation run even if there is no red text in the table. The OSCAM results screen has a set of outputs related to environment flying hours shortfall that can be used to determine whether or not the targets are being met. The summary bar above the results table also highlights if there are any flying hours shortfalls.

Results screen non-cost outputs showing environment flying hours shortfalls

Non-cost results showing Environment flying hours shortfalls