Modification/Repair (Minor) inspection limits and intervals
Modification/Repair (Minor) inspection limits and intervals
(OP)
I am required to develop a procedure on how to develop the inspection limits and intervals for modifications/repair (minor).
Are there any references that I can refer to? Our current practice is 'ON CONDITION' for the intervals unless there is an instruction from the equipment manual to comply to such interval. E.g The battery of an ELT shall be replaced every 12 months and inspected every 5 months.
Please advice. Thank you.
Are there any references that I can refer to? Our current practice is 'ON CONDITION' for the intervals unless there is an instruction from the equipment manual to comply to such interval. E.g The battery of an ELT shall be replaced every 12 months and inspected every 5 months.
Please advice. Thank you.
RE: Modification/Repair (Minor) inspection limits and intervals
B.E.
You are judged not by what you know, but by what you can do.
RE: Modification/Repair (Minor) inspection limits and intervals
The authority asked us to develop a general (Part 23, 25, 27 & 29) procedure on how to develop the inspection limits and intervals for modification/repair (minor).
For an example: installation of an antenna on the fuselage (part 27) of the rotorcraft. We put 'on condition' for the visual inspection of the antenna. Or we might put perform visual inspection of the installation as per AMM which the manual stated to perform it annually (example). But they refused to accept this saying that the Para on the AMM is for without the modification.
Another example:
Part 25 Appendix H
(a) The Instructions for Continued Airworthiness must contain a section titled Airworthiness Limitations that is segregated and clearly distinguishable from the rest of the document. This section must set forth--
(1) [Each mandatory modification time, replacement time, structural inspection interval, and related structural inspection procedure approved under § 25.571.
For minor modification usually it does not requires to comply with FAR 25.571. Does this means that for minor modification it is not necessary to have detail inspection interval, as 'On Condition' is sufficient?
RE: Modification/Repair (Minor) inspection limits and intervals
If you've done a DTA of your installation and shown no inspections are required then why do you need a section in the ICA ? ACtually it sort of makes sense, to give visibility to the fact that analysis was completed and no inspections are required (rather than to have people wonder).
another day in paradise, or is paradise one day closer ?
RE: Modification/Repair (Minor) inspection limits and intervals
The General FAA/DOD guidance to ensure that structural mods allow for ease of interior and exterior inspections... that will ensure incipient damage [cracking, loose/missing fasteners, distortion, etc] is readily apparent is a wise-way-to design the mod.
Also...
One thing I discovered about mods like this... especially involving small electronic stuff that may be grounded-to/poking-thru the fuselage skin... is poor attention to corrosion-protective finishes that eventually cause structural corrosion... or worse... electrical grounding-point corrosion. A well designed structural mod [repair, retrofit, replacement, etc] with poor integration of corrosion protection is why many structures problems begin... or become aggravated.
Regards, Wil Taylor
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