Compliance
In forceCompliance
Compliance Compliance
Installed filters: At next inspection of the engine air inlet filter element or within 25 hours time in service from the effective date of this directive, whichever occurs first, and thereafter at intervals not to exceed 25 hours time in service.
Spare filters: Prior to installation in a engine.
This Airworthiness Directive becomes effective on 9 September 1999.
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