Planning and Preparation

   Planning is critical to human factors in that it should aim to ensure that there are adequate appropriately qualified and alert personnel, tools, equipment, material, maintenance data and facilities at the right place, at the right time, for the scheduled and unscheduled tasks. 

      CAR 145 states that an organisation may only maintain an aircraft /component when all necessary facilities, equipment, tooling, material, maintenance data and certifying staff are available. It is not the purpose  to tell planners how to do their jobs but, rather, to highlight some of the human factors issues which they should be taking into account in the planning process, such as human performance limitations when working shifts and long hours.                                                 Depending on the amount and complexity of work generally performed by the maintenance organisation, the planning system may range from a very simple procedure to a complex organisational set-up including a dedicated planning function in support of the production function.                                                           The production planning function includes two complimentary elements: 

• scheduling the maintenance work ahead, to ensure that it will not adversely interfere with other maintenance work as regards the availability of all necessary personnel, tools, equipment, material, maintenance data and facilities.

 • during maintenance work, organising maintenance teams and shifts and provide all necessary support to ensure the completion of maintenance without undue time pressure. When establishing the production planning procedure, AMC-145.A.47(a)(3) states that consideration should be given to the following:

  • logistics; 
  • inventory control; • 
  • square meters of accommodation; • 
  • hangar availability; • man-hours estimation; • 
  • man-hours availability; • 
  • preparation of work; • 
  • co-ordination with internal and external suppliers, etc.; • 
  • scheduling of safety-critical tasks during periods when staff are likely to be most alert, and avoiding periods when alertness is likely to be very low, such as early mornings on night shifts.                                                                                                    CAR145 requires an organisation to have a maintenance man-hour plan showing that the organisation has sufficient staff to plan, perform, supervise, inspect and quality monitor the organisation. In addition, the organisation must have a procedure toreassess work intended to be carried out when actual staff availability is less than the planned level for any particular work shift or period. It is important that planners attend human factors training, in order to better appreciate how good or bad planning can potentially affect human performance and, ultimately, safety and airworthiness.

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