Re: encore un Wingspar AD sur PA28 en preparation...

greg06 a écrit:Leon Robin a écrit:...que l'usage de nos avions (privé ou école) fait que N = 0 selon la réglementation américaine...
J'ai relu le 91.409 "Inspections" et le SB1372 et je ne comprend pas en quoi la pratique de l'aviation prive ou ecole en Europe/ATO nous dispense de compter le nombre de 100hr dans le calcul du CSH. Peux tu m’éclairer?
Parce que c'est spécifié dans ce qui suit (les citations sont extraites directement du SB, les mises en forme de caractères - - gras et soulignements - sont de moi)
Piper SB1372 page 2 of 19 a écrit:WARNING: THE INSPECTION INTERVALS, MODIFICATION, AND REPLACEMENT EVENTS IN TABLE 1 ON PAGE 3 ARE BASED ON AIRPLANES OPERATING UNDER NORMAL USAGE, WHICH IS DEFINED AS PERSONAL OR FLIGHT INSTRUCTION.
AIRPLANES THAT OPERATE OUTSIDE OF NORMAL USAGE AND/OR OPERATE IN MORE SEVERE ENVIRONMENT DO SO AT THE RISK OF REDUCING THE LONGEVITY OF THE WING SPARS AND AIRPLANE, MAY REQUIRE MORE FREQUENT INSPECTIONS AT REDUCED
CSH INTERVALS (WHICH IS NOT DEFINED IN THIS SERVICE BULLETIN), AND AN INCREASED RISK TO THE LIVES ONBOARD THE AIRPLANE.
... et illustré dans l'exemple suivant
Piper SB1372 page 6 of 19 a écrit:Initial Calculation
An airplane in Group 1 with unmodified wing spars is performing the initial compliance with Part I and has no 100-hour inspections (that is, § 91.409(b) is not applicable to any flight time):
The airplane maintenance records show that each wing spar installed on the airplane have a total of 12,100 hours TIS, only annual inspections have been done, and none of the annual inspections were
done for purposes of compliance with § 91.409(b). Both main wing spars are original factory installed.
Using these values in the formula, as shown below, results in 6,050 CSH. In this example, the initial inspection would be required within the next 100 hours TIS as the wing spars have exceeded
the 5,000 CSH threshold for initial inspection. The wing spars are now within Tier A with an interval of 1,750 CSH and next inspection would be required at 7,800 CSH (6,050 + 1,750 = 7,800).
If the number of 100-hour inspections required by § 91.409(b) is 0, the total hours TIS of the airplane is 12,100 hours, then the formula and resulting CSH would be:
12,100 + (0 × 100) / 2 = 6,050 Calculated Service Hours
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