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For what it's worth, I sum the following parameters in costing out my bid prices for my aerial survey contracts:
Fuel: Estimated burn/hour on the mission x estimated fuel price I'll
be paying. (I include an escalator clause in my contracts for
price increases outside of a set range)
Maintenance Allowance: $100/hour
Engine/Propeller (overhaul) Reserve: $40/hour
Pilot salaries: Whatever yours would be on a per hour basis.
Hangar Rent: Monthly cost.
Ancillary Costs: Anything directly attributable to operating the
airplane, e.g. in my case the cost of my flight tracking
system.
Strictly regarding maintenance, after a sizable up front investment prepping the airplane, I budget $8-12K for annuals depending on what I think might be needed. Based on flying approx. 200-250 hours/year, the $100/hour works out about right (so far) for an annual and 100 hour plus random unplanned maintenance - with the caveat that I do a lot of the work myself under the supervision of my IA.
On top of those costs, of course, I add what I think is a reasonable profit margin.
Joe
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