# Maintenance ration question

Couple of maintenance questions:

1.

Does the maintenance ratio depend only on the time flown (departure-arrival block time), or is the number of segments (takeoffs/landings) also taken into consideration?

In other words, would 3 x 1 hour flights have the same maintenance ratio as 2 x 1.5 hour flights? (excluding turnaround time) ?

2.

Does the maintenance cost depend on time flown / segments flown? In other words, does idle aircraft and flying aircraft have the same maintenance cost? If maintenance is only calculated on flying aircraft, does it depend on time flown, segments flown, or combination of the two?

3.

I know there is a 15% penalty for the 4th maintenance category. Not that I am getting the 4th one (or even the 3rd one) anytime soon, but it's good to know:

Does the 15% come out of the TOTAL maintenance package, or just the 15% is added on top of the maintenance package of the 4th feel type aircrafts? If I get the 5th type, is that additional 15%. Is those 15% calculated on the base of the basic amount, or the total amount (e.g. 100 + 15 + 15) or is it (115 + 17.25*)? --- 17.25 is 15% of the 115, which is the basic + 15% of the 4th type.

1. It's a combination of time flown and sectors flown ....

2. AS system calculates for each flight so called damage points...... a long range flight of 8 hrs will get less damage points then if you do 4x1 hrs sectors in the mean time. Which is logical .... each take off has a big impact on engine life and each landing is stress for brakes, airframe and landing gear ..... so if you have a maintanance stop coming up your maintanance Provider will get the damage points back to 0 if you have a normal 4-5 hrs break for example.  How much damage points you will accumulate during a flight and how quickly they are reduced depends on the speed and quality of your provider. Parked aircraft will be brought back to 100% before the next flight but otherwise will not cost you additionally as far as I know.

3. The 15% will be added on the TOTAL maintanance costs!

Thank you, Benjamin.

Some clarification though:

It doesn't matter where exactly the maintenance window is put in the schedule (e.g. mid-day vs end-of-day), as long as the maintenance ratio is above 100.1%, correct?

Is the 15% also for each additional fleet type, e.g. 5th fleet type would be another 15%? And if yes, would it be 15% of the 115% or would it be calculated of the base 100%

Let me explain:

FL. # - Maintenance Cost

1 - 100%

2 - 100%

3 - 100%

4 - 115%

5 - 115% or 130% or 132.25% ???? (132.25 is calculated as 15% of 115 in line 4).

Thank you, Benjamin.

Some clarification though:

It doesn't matter where exactly the maintenance window is put in the schedule (e.g. mid-day vs end-of-day), as long as the maintenance ratio is above 100.1%, correct?

It is possible to cancel flights with mx ratios over 100% if you have the plane fly all day for 6 days and then expect all mx to be performed on sunday. If you have equal regular mx blocks every day you'll have no problem.

at best you will give your aircraft about 5 hrs ground time ...... you can split it into 2x2,5 or one time 5 or you as you like to stay above 100% ...... but if you decide to give only every secod or 3rd day maintanance you will of course need more ground time to go back to 100%. If the Condition of the plane falls below 50% the plane will land at the nearest Airport enroute and will get maintanance back to 100%.

for the second part i am not 100% sure since i haven't tried but I would think that if you have 6 categories you would pay aditionally 45% of the Total costs ....

The penalty is additive.  The total cost goes 100, 100, 100, 115, 130, etc.

From the Wiki: IMPORTANT: Your first three maintenance categories are "free", meaning you pay a flat fee of 100% base maintenance costs. The fourth category raises maintenance costs by 15%, the sixth adds another 15% to 130%, and so on. This figure refers to all your planes.

The penalty is additive.  It goes 100, 100, 100, 115, 130, etc.

From the Wiki: IMPORTANT: Your first three maintenance categories are "free", meaning you pay a flat fee of 100% base maintenance costs. The fourth category raises maintenance costs by 15%, the sixth adds another 15% to 130%, and so on. This figure refers to all your planes.

From what I understand I think that if you have three classes you will pay 100% for each (100% 100% 100%).

But if you add a fourth class you will have to pay 115 for each class (115% 115% 115% 115%)

Edited mine, but the English is still awkward.

Maintenance Cost = Actual Cost * (1+0.15*[N-3]) for N>3 where N is the number of maintenance categories.

4 categories is 1.15

5 categories is 1.30

6 categories is 1.45

The wiki is confusing (not that I will be at 6 categories anytime soon)

the sixth adds another 15% to 130%, and so on

Is it 115% (3rd, 4th) + 15% (5th) = 130% [ the sixth adds another 15% to result in 130%]

or is it 130% (4th)  + 15% = 145% [the sixth adds 15% on top of 130%]

Depends how the writer meant it ... can be interpreted both ways. Case #1, the forth and fifth fleet would share 115% increase.

Hi,

if I am correct, every extra maintenance family (above three) adds 15% to your total, normal maintenance costs.

3 maintenance families = normal maintenance cost (100%)

4 maintenance faimlies = 115%

5 maintenance families = 130%

and so on.

And I don't think this is a case of compound interest (I mean you don't add 15% to 115% for the fifth category, but 30% to 100  ;-)

Jan

if I am correct, every extra maintenance family (above three) adds 15% to your total, normal maintenance costs

You are ;)