Scheduled maintenance for smoke detectors (ATA26)
We would like to remind that a scheduled cleaning of smoke detectors is actually a major factor to ensure a good reliability and safety on board. Indeed, the contamination by dust, textile fibers, in fact any particles in suspension in the air is a well known issue for smoke detectors. There are two possible impacts of a heavy contamination:
1/ a significant decrease of the smoke sensitivity and, in a worst case, a complete loss of the fire detection, especially when there is no redundancy. An example of a critical contamination is illustrated in the page 3 appendix.
2/ an increase of the smoke sensitivity. In this case, the safety is not affected but the probability of spurious warnings is increased as the smoke detector immunity is reduced.
Above mentioned situations mean that, either safety can be badly affected and/or that normal operations can be disturbed if a preventive maintenance is not performed. Therefore, based on our significant field experience, we highly recommend to apply a scheduled cleaning every 6,000 FH for ionization types and 9,000 FH for photoelectrical types (latest generation). These preventive task intervals could be reduced when detectors are operating in unusual dirtying conditions.
The cleaning of our smoke detectors must fulfill good practices and must be compliant with our OEM proven process that can only be guaranteed by our repair shop and/or by any of our approved repair stations. Our customer support network, shown hereafter, is ready to serve you to again enhance the safety on board and dispatch performances of your airliners.
Reliabilty and Safety on board your aircraft are our major concerns.
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