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maintenance intervals

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maintenance intervals

Old 16th Oct 2021, 09:28
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maintenance intervals

Hi all,

getting a little lost in translation!

part ML.A.302 states: A MIP shall contain the following inspection intervals: (a) for aeroplanes, touring motor gliders (‘TMGs’) and balloons, every annual or 100- h interval, whichever comes first, to which a tolerance of 1 month or 10 h may be applied. The next interval shall be calculated as from the time the inspection takes place;

This text suggest to me that if a 100hr inspection was due at 2000 hr but performed at 2010, the next inspection should be done at 2110. That seems illogical though!
that way you get a 10hr credit and you could apply that to each 100hr inspection. Logic dictates that the next inspection should take place at 2100hr. But that to me doesn't make sense with the sentence: the next interval should be calculated as from the time the inspection TAKES place.

Who knows the answer?

thanks in advance
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Old 16th Oct 2021, 16:26
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The general interpretation of that extension is that if you use your month or ten hours, you then deduct that from the next inspection interval. So if your aircraft was due its annual on January 1st at 2000 hours, but the check wasn't started until January 15th and 2007 hours, then your next check would still be due on January 1st the next year and at 2100 hours. In other words, you have the opportunity to extend the commencement of the check, but to benefit from it.
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Old 17th Oct 2021, 09:24
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This is not that complicated. Inspections to be performed by date (Annual) are just that and so the total airframe/engine hours are irrelevant. Each time the inspection date applies the one month extension may be used. The hours are the hours and so the 100 hour inspection is always due 100 hours from the last inspection but the +10 hours may be exploited. The 100 hour may be from the annual or the last 100 hours inspection, as applicable, because all elements of the 100 hour will also be part of the annual inspection.

There is no accumulated benefit in either case even if the extensions are always exploited. There is not a date or flight hour when an inspection must be "started" but flight is prohibited when an inspection is due (plus extensions) until the inspection is completed and signed off.

Last edited by Fl1ingfrog; 17th Oct 2021 at 12:44.
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Old 25th Oct 2021, 20:48
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Remember though although the inspection periods are now 100 Hrs, your engine oil changes are 50 hrs or less, if you value your engine I would still be doing that,

In the U.K. we always operated a 10% extension period prior to this, and as said it’s 100 hrs from when the check is done, the extension is more an aid to allow you to deliver the aircraft and plan the maintenance rather than a carte blanche 110 hrs.
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