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1.2  The CAA must be satisfied that the unit maintains sufficient qualified controllers to provide safe air traffic control services. Consideration will be given to the regularity of the Air Traffic Control Service in determining whether a service is safe. There must be no possibility that users will be confused as to which service they are receiving because the type of service changes from day to day or hour to hour. Careful consideration will also be given to the provision of more than one service simultaneously before approving a unit.
1.3  Although conditions at different units may vary an approximation for the calculation of
the minimum number of controllers required is given using the following formula: ND
Total number of valid controllers, C = ----------------------- rounded up to whole number
365 – R
Where N =  Number of controllers required to attend for duties, including a relief to give breaks, each day. This will depend on the number of operational positions and the period for which they are scheduled to open.
D = Number of days the unit provides services in a year.
R = Number of days a controller is not available for duty,
i.e. rest days annual leave public holidays in lieu allowance for sickness training etc.
Example 1
A unit comprising Aerodrome Control and a combined Approach and Approach Radar Control open seven days a week between 0600 hrs and 2200 hrs. Both positions manned at all times.
N = 6 (i.e. 2 early duties
2 late duties
2 relief duties)

D = 365
R = 120 (i.e.rest days – 3x 2. x 12 = 90
leave = 21
public holidays = 9)

6365
.
Therefore C =-------------------------- = (8.9) 9 controllers
365 – 120
Example 2
A small unit without radar able to provide a combined Aerodrome and Approach Control service at certain times of the day. Open 6. days a week between 0600 hrs and 2200 hrs for 6 days and 0800 hrs to 1600 hrs on the half day.
N =4 (i.e. 1 early duties 1 late duties 1 duty to split positions (max 10 hrs) 1 relief duties)
D = 338
R = 120 (as example 1 above)
4338
.
Therefore C = --------------------------= (5.5) 6 controllers
365 – 120
Certain assumptions have been made in the calculation of 'N' in the examples above. There are many ways of deploying staff and managers may use other criteria in arriving at 'N'. Whatever method is used, the critical factor will be the regulation of hours scheme.
1.4  In neither example has any allowance been made for sickness or other duties. If a controller at the unit in the first example became ill and was absent for any length of time this could result in controllers breaching the hours limitations. As this might require some restriction to the operation of the unit it might be prudent to make such allowance.
1.5  There is scope in the second example for sickness, training etc. If an allowance of 10 days per controller is assumed, 'R' is increased to 130 and 'C' becomes 5.75. The rounded up figure is still 6 controllers.
2  Watch Rosters
2.1  Providers shall meet the rostering limitations specified in the Scheme for the Regulation of Air Traffic Controllers' Hours set out in Section 2.
2.2  Providers shall notify the CAA of formal rostering arrangements of a repetitive nature only once. However, details of the roster actually worked showing variations due to unforeseen circumstances may be required at the discretion of the CAA, Air Traffic Standards Division (ATSD), particularly where there is a slight shortfall of staff and overtime is likely.
2.3  Providers who are unable to set a regular pattern of attendance for Air Traffic Control Officers shall supply to the CAA a copy of the prepared roster at least 30 days before it is due to come into force together with details of each month’s, or each four week period’s, roster actually worked.
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(112)