What is the key restriction on alternative maintenance actions compared to the applicable MIP?

Alternative maintenance actions shall not be less restrictive than those set out in the applicable MIP. This means the extent of maintenance to be covered by the deviating task cannot be less than the extent of the corresponding task in the MIP in terms of frequency and task type.

If the ICA task is 'Inspection XX 12 months interval' and the AMP proposes 'Inspection XX 24 months interval', while the MIP task is 'Inspection XX 12 months interval', is the alternative acceptable?

No, the alternative is not acceptable because the proposed 24-month interval is less frequent than the MIP's 12-month interval.

If the ICA task is 'Inspection XX 24 months interval' and the AMP proposes 'Inspection XX 36 months interval', while the MIP task is 'Inspection XX 12 months interval', what interval must be kept?

The 24-month interval must be kept, as the proposed 36-month interval is not acceptable.

If the ICA task is 'Functional test system XX' and the AMP proposes 'Operational test system XX' at the same interval, while the MIP task is 'Functional test system XX' at the same interval, is the alternative acceptable?

No, the alternative is not acceptable because a functional test is considered more restrictive than an operational test, so replacing a functional test with an operational test would be less restrictive than the MIP.

If the ICA task is 'Inspection XX 24 months interval' and the AMP proposes 'Inspection XX 36 months', while there is no relevant MIP task, is the alternative acceptable?

Yes, the alternative is acceptable because there is no relevant MIP task to constrain the interval.

If the ICA task is 'Functional test' and the AMP proposes 'General visual inspection' with no relevant MIP task, is the alternative acceptable?

Yes, the alternative is acceptable because there is no relevant MIP task to constrain the task type.

What is the applicability date of the rule that defines alternative maintenance actions?

The rule is dated *ED. Decision 2023/013/R*.

GM1 ML.A.302(c)(3) Aircraft maintenance programme

Q: What does the term 'maintenance actions alternative to those referred to in point (c)(2)(b)' mean in the context of developing an aircraft maintenance programme?

It refers to when the ICA issued by the DAH or the declarant of a declaration of design compliance are used as the basis for the AMP development, and the CAMO, CAO or owner (as applicable), when developing the AMP, decides to deviate from certain of these instructions, introducing, for example, a less frequent interval than or a different task type (inspection instead of check) from the one established by the ICA.

Q: If the ICA task is 'Operational test system XX' and the AMP proposes 'Functional test system XX' at the same interval, while the MIP task is 'Operational test system XX' at the same interval, is the alternative acceptable?

Yes, the alternative is acceptable because a functional test is considered more restrictive than an operational test, so the proposed task is more restrictive than the MIP requirement.

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GM1 ML.A.302(c)(3) Aircraft maintenance programme

ED Decision 2023/013/R

ALTERNATIVE MAINTENANCE ACTIONS

‘Maintenance actions alternative to those referred to in point (c)(2)(b)’ refer to when the ICA issued by the DAH or the declarant of a declaration of design compliance are used as the basis for the AMP development and the CAMO, CAO or owner (as applicable), when developing the AMP, decides to deviate from certain of these instructions issued by the DAH or the declarant of a declaration of design compliance, introducing, for example, a less frequent interval than or a different task type (inspection instead of check) from the one established by the ICA.

These alternative maintenance actions shall not be less restrictive than those set out in the applicable MIP. This means that the extent of the maintenance to be covered by the deviating task cannot be less than the extent of the corresponding task in the MIP in terms of frequency and task type.

Examples of alternative maintenance actions:

ICA task	AMP proposed alternative	MIP task	Alternative acceptable Yes/No
Inspection XX 6 months interval	Inspection XX 12 months interval	Inspection XX 12 months interval	Yes
Inspection XX 12 months interval	Inspection XX 24 months interval	Inspection XX 12 months interval	No
Inspection XX 24 months interval	Inspection XX 36 months interval	Inspection XX 12 months interval	No (24 months to be kept)
Functional test system XX	Operational test system XX (same interval) or general visual inspection system XX (same interval)	Functional test system XX (same interval)	No*
Operational test system XX	Functional test system XX (same interval)	Operational test system XX (same interval)	Yes*
Inspection XX 24 months interval	Inspection XX 36 months	None relevant	Yes
Functional test	General visual inspection	None relevant	Yes

*A functional test is considered more restrictive than an operational test.

Remark: the above does not apply to one-time interval extensions, for which ML.A.302(d)(1) provides 1-month or 10-h tolerance (i.e. permitted variation) for aeroplanes, touring motor gliders (TMGs) and balloons and 1-month tolerance for sailplanes and powered sailplanes other than TMGs.

Details

Source-Title: GM1 ML.A.302(c)(3) Aircraft maintenance programme View latest amendments

Erulesid: ERULES-1963177438-15973 Compare versions

Domain: Continuing airworthiness

Applicabilitydate: 21 October, 2023

Entryintoforcedate: 21 October, 2023

Regulatorysource: ED Decision 2023/013/R Navigate

Regulatorysubject: Part-ML

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: ML.A.302 Aircraft maintenance programme

Origin: EASA

Category: EAR