على أساس عدم المخاطر الصحية و عدم توفر اعتمادات الصيانة

http://www.humaware.com/hum-credits.php
In aerospace any process improvement in maintenance has to be certified by the regulator as being safe. These process improvements are known as Maintenance Credits.
Since the inception of Condition Based Maintenance technology and the HUM systems on aircraft very few Maintenance Credits have been obtained; most HUM data is treated as advisory and the systems are certified on a no hazard - no credit basis.
If HUM data can be used to alleviate the need for costly maintenance that results in unnecessary down time then the HUM data needs to be credit worthy, even more so if aircraft are going to be maintained on condition.
With 30 years of experience in HUM systems technology, we assist your engineering teams in developing HUM and related asset management systems and processes to support the generation and implementation of Maintenance Credits.
Humaware has supported a number of bids for Maintenance Credits and has a knowledge base to give you the assurance to successfully navigate round the pitfalls of the Maintenance Credit Process. Humaware currently supports both military and civil regulators in programmes that are developing the processes and technical requirements for Maintenance Credits for HUM systems certification.
For HUMS - No credit equals no benefit in reducing maintenance costs.
Our HUMS technology profile can be found on our legacy web site.
Contact Humaware to find out how we can support your organisation through the Maintenance Credits process

http://www.skybrary.aero/bookshelf/books/382.pdf
The system was originally certificated for use on a ‘No Hazard, No Credit’basis. This meant that the system was not certified against any functional health monitoring requirements or objectives. No warnings are provided to the flightcrew (with the exception of Flight Manual exceedences) from which a decision about the airworthiness could be made in-flight

http://www.helitavia.com/docs/CAP562_CAIPS_09_elec_eqpt.pdf
The approval is therefore based upon a ‘no hazard, no credit’ assessment in that theequipment is assessed purely on the basis that it introduces no hazard to the aircraftor occupants, but that no credit is given to its functionality .