Read the following passage regarding aviation maintenance protocols.
During the overhaul of the Class-IV aviation maintenance protocols, Directive 44-B explicitly replaced the older 30-day inspection cycle with a staggered 45-day cycle for rotor-hub assemblies. However, the transmission gearbox inspections, previously aligned with the 30-day cycle, were shifted to a 60-day interval under the new directive. Furthermore, while the hydraulic fluid replacement mandate remained fixed at 500 flight hours, the auxiliary power unit (APU) diagnostic checks were reduced from 120 flight hours to 90 flight hours to mitigate thermal stress. The directive strictly mandates that all Class-IV facilities fully implement these specific scheduling adjustments by the end of the third fiscal quarter.
Statement to evaluate: Under Directive 44-B, the 45-day inspection cycle is specifically applied to transmission gearboxes, while auxiliary power unit diagnostic checks are reduced to 90 flight hours.
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