French term (edited): dérogation/s interne/s

'The question you are about to answer is not among your general fields of expertise, is this intentional?' - I disagree with that ProZ classification.

L'allongement des arrêts nécessite des dérogations internes : extension of the stoppages will call for internal opt-outs (of the company Protocol).

Reducing the frequency... ?

'Internal concession' in the first ProZ weblinked answer suggests such benefits as UK company luncheon vouchers.

If you use phrases like 'opt-outs' or 'exceptions', you have to say what from. For that reason, I think this is a better suggestion.

I'm not a fan of 'internal', and neither that nor 'in-house' comes up in relation to 'dispensation'.

So I'm stuck with 'managerial' (as opposed to 'administrative', i.e. governmental, etc.) dispensation.

"Dispensation for Non-Standard Operational and/or Maintenance Procedures
During the operational life of a field, there may arise situations where it is not possible to maintain the measurement station to the previously-agreed standards without resorting to potentially very expensive intervention, up to and including a full process shutdown. In such cases, the need to maintain measurement integrity must be balanced against the cost of the required intervention. Deviations from the agreed standards of operation and/or maintenance are managed by DECC via a system of dispensations."
https://assets.publishing.service.gov.uk/media/5a78ae0440f0b...

"Can CAA provide any dispensation if we are unable to carry out scheduled maintenance tests such as foam testing?
A The principal objective should be to continue to maintain and test vehicles and equipment as planned. However, where there are difficulties in arranging for such testing to be carried out, and where a suitable ongoing maintenance and testing schedule has provided evidence that RFFS vehicles and equipment are safe and operating at their optimum performance, we consider it reasonable to delay any testing that falls due during the challenging times currently being faced. If you take this course of action you must consider the length of the extension and its impact on safety, and you must put in place plans to return to normal when government advise [sic] supports it."
https://www.afoa.org.uk/wp-content/uploads/2020/10/20201009R...

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Note added at 15 hrs (2024-02-17 11:38:58 GMT)
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https://twitter.com/GarethDennis/status/973847573126578177

Departing from the TSIs, Euronorms or Railway Group Standards requires a deviation, in the latter case through @RSSB_rail. If a departure is only being sought from NR standards (and not in a way that contradicts the others), then only an internal derogation is needed.

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Note added at 15 hrs (2024-02-17 11:40:04 GMT)
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https://whattheythink.com/news/102405-markem-imaje-joins-eup...

Grey: Substances with lawful restriction, normative and/or from customers. Use over the internal limit is forbidden except under internal derogation

I'd be very much inclined to rephrase the whole thing in English engineering-speak. For example:

L'allongement des arrêts nécessite des dérogations internes ...
-->
Any increase (in the intervals between stoppages for planned maintenance) requires (or 'is subject to') the prior issue of a (senior) management directive to that effect ...

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Note added at 17 hrs (2024-02-17 13:27:57 GMT)
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Basically, the ST is saying that someone in a position of authority within the company that manages the maintenance schedule (and related protocols) must assume formal responsibility for the eventual problems that might be caused by prolonging the intervals between scheduled maintenance stoppages.

Derogation is a legal term of art,[1][2] which allows for part or all of a provision in a legal measure to be applied differently, or not at all, in certain cases.[3]
https://en.wikipedia.org/wiki/Derogation#cite_note-ef-3

Guidance on technical derogation requests
Overview:
This document sets out our guidance on the process for requesting a derogation from an obligation to comply with a technical requirement.
https://www.ofgem.gov.uk/sites/default/files/docs/2017/09/de...

Term: durée de maintenance preventive
Definition: the part of the maintenance time during which preventive maintenance is performed on an item, including technical delays and logistic delays inherent in preventive maintenance
Term: preventive maintenance time
https://iate.europa.eu/entry/result/1614215/fr-en

(a) Copies of the procedures related to the competent authority’s management system, and their amendments to be made available to the Agency for the purpose of standardisation should provide at least the following information: …
(4) Principles of managing exemptions and derogations.
https://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

“All defects or incomplete work that renders the track unsafe for operation will be fixed immediately, extending the time of the event if necessary.
https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/reg...

To extend the maintenance time of the 1000T unit, internal derogation policies with an operating log are required.

French term (edited): [l'allongement des arrêts] nécessite des dérogations internes

or
[...] requires obtaining exceptions to internal rules

Never mind what "l'allongement des arrêts" is supposed to mean exactly in this ST.

Not that it would change anything regarding "dérogations internes", but there is something not quite right in your ST (or your interpretation of the ST?).

Y’a quelque chose qui tourne pas rond dans cette affaire.

Unless the source text was clumsily worded "l'allongement des arrêts" would mean that the time these machines are taken off production is getting longer that expected / planned.

"to reduce the frequency of planned maintenance of machinery" would be "l'allongement des intervals entre les arrêts", leading to exactly the opposite result of the one you would get from "l'allongement des arrêts".

Both "l'allongement des intervals entre les arrêts" and "l'allongement des arrêts" would require "making exceptions to internal rules" - but for different reasons.

"longer maintenance intervals" are a potential safety risk, while "longer off production times" are guaranteed loss of revenues. The way most companies operate it's for "longer off production times" that some kind of "dérogations internes" would be required.

Key point: "une dérogation" is not a permanent change of rules, but an exception to the usual/general rule. In this ST it would be most likely a "temporary exception" on a case by case basis.

https://www.google.co.uk/search?q=la dérogation waiver&lr=la...

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Note added at 2 jours 21 heures (2024-02-19 17:41:23 GMT)
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https://www.jjkellersafety.com/resources/articles/2021/under...

Lockout exceptions

OSHA provides some exceptions that allow for equipment service or maintenance without using lockout procedures.

The first is for “cord and plug” equipment. If a tool or machine can simply be unplugged, and the worker performing the service remains in control of the plug, then lockout procedures aren’t necessary.

The second exception is for minor service. Minor tool changes, adjustments, or routine tasks that are integral to production might not require lockout procedures. However, if a worker must bypass a guard or place any part of the body in a danger zone, the minor service exception won’t apply. Workers must use other procedures that provide protection, such as using a long tool to reach into a machine rather than reaching their hands into the machine.

this supports my agree for Mpoma