Hello Fellow Pilots ;
Some time ago I mentioned about a project and it is about to come to end and make a decision, maybe the first airplane is going to be P2008. I am trying to calculate every grain of the salt . Couple of hours ago I received an email from a CAMO in my country. I cut names and the other stuff. I want to attach the final and the most eye opening page of the proposal. I made my plans to spare 15 Euros for maintenance and 15 Euros for Engine ( plus 5 Euros safety margin, with spare parts and oil etc . included). However when I check the numbers the bottom line , I had a little shock. I would like to hear about your opinions and suggestions about this offer. Every sentence is important for me. Thanks for your valuable contributions.
Saat : Hours
If my calculation is correct :
50 hours : 40 * 320 : 12800
100 hours : 10*1520 : 15200
200 hours : 6*1880 : 11280
600 hours : 2*2580 : 5160
1000 hours: 2*2090 : 5180
1200 hours : 1*3280 : 3280
2000 hours : 1*3650: 3650
Total : 56550 USD / 2000 : 29 USD per hour
SkyWagon wrote:
Couple of hours ago I received an email from a CAMO in my country.
You mean maintenance facility? Or perhaps combined with CAMO?
Are the figures in Euros? I calculate €7:70 / flight hour over 2000 hours. That seems cheap to me.
Airborne_Again wrote:
You mean maintenance facility? Or perhaps combined with CAMO?
It is combined with CAMO. Please , check my calculation. 
SkyWagon wrote:
50 hours : 40 * 320 : 12800
100 hours : 10*1520 : 15200
200 hours : 6*1880 : 11280
600 hours : 2*2580 : 5160
1000 hours: 2*2090 : 5180
1200 hours : 1*3280 : 3280
2000 hours : 1*3650: 3650
That’s not how I understand it. A 100 hours check includes a 50 hours check, so over a 2000h flight period you will do only 20 times a 50h check, not 40 times. Similarly a 1200h check includes a 600h check, so at 1200h you do a 1200h, not a 1200h check plus 600h check. So, flying 2000 hours, I count:
50h: 20 (at k*100+50 hours, where k is an integer)
100h: 10 (at (2*k+1)*100 hours)
200h: 5 (at 200h, 400h, 800h, 1400h and 1600h)
600h: 2 (at 600h and 1800h)
1000h: 1 (at 1000h)
1200h: 1 (at 1200h)
2000h: 1 (at 2000h)
Another (easier) way to compute is by row instead of by column. You should get the same result:
40*(airframe A + engine 50)
20*(airframe B + engine 100 + lubrication 100)
10*(engine 200)
3*(airframe C + lubrication 600)
2*(engine 1000)
1*(airframe D)
1*(airframe E)
Also, if you don’t fly a lot, the most cost will not come from “I have to do an inspection because of hours flown”, but “I have to do an inspection because of time elapsed”. E.g. your plane may need a 200h-check at least every year, even if it has flown only 45h over the whole year, and at least a 1200h every five years, even it has flown only 200h in these five years. You need to account for that in your computations, based on your estimated average/median yearly flight time.
Also, if you want the “true average long-term cost”, you should do that over 6000h, because that’s the smallest common multiple of all the intervals. Or just take fractions, to compute a per-hour cost as:
(airframe A + engine 50)/50 + (airframe B + engine 100 + lubrication 100)/100 + (engine 200)/200 + (airframe C + lubrication 600)/600 + (engine 1000)/1000 + (airframe D) / 1200 + (airframe E)/2000.
And all that is only labour, but you already knew that. The parts will cost extra.
SkyWagon wrote:
Please , check my calculation.
We were both wrong. lionel is right. If I’ve entered the figures right this makes about 22:50 of whatever the currency is (USD?). To me that sounds not cheap but reasonable.
@lionel thanks a lot for the detailed explanation. I will definitely re calculate my maintenance cost again. Airplane is planned to fly around 700- 800
hours per year.
@Airborne_Again sorry for the currency. It is in USD. When I make the comparison between Tecnam data sheet and the offer, the data sheet gives around 14 Euros/hr for 2000 hours.
