With a large number of aircraft due to be reactivated from storage programs in 2022 it will be important for the technical teams to evaluate the work performed during the storage, review the Airworthiness Directives (AD’s) for compliance, the Hard Time (HT) component lists and the Last-Done-Next-Due (LDND).
On a typical review of a LDND report the technical personnel will perform a line-by-line review of each task to see when they were last done and when they are next due.
The report will contain the following;
*Operator Specific Maintenance Tasks
*System Maintenance Tasks
*Zonal Maintenance Tasks
*Structure Maintenance Tasks
*Certification Maintenance Requirements
*Soft Life Items Listing
*Optionally – Structural repairs requiring repeat inspections
Other areas of consideration that need to be taken into account during the LDND review are;
1. OOPS – Out of Phase requirement, this is when a task that does not fall into a scheduled maintenance activity (an A Check/HMV/C Check).
2. SRT – Single Running Tasks are also commonly included within the LDND and similar to OOP’s they can also be provided in a separate document depending on the operator records.
3. SSI’s – Supplemental Structural Inspections; they are as their name suggests supplemental and typically exist for older aircraft or “aging aircraft”, SSIs are important for continued operation of an aircraft as they are designed to detect in a timely manner any potential issues such as fatigue at certain locations on the aircraft where there may not have been any issues yet.
4. CMR – Certificate of Maintenance Requirement, the task is a requirement from the design certification of the airplane as an operating limitation of the type certificate. On the review you will compare the CMR intervals and thresholds from the provided report to ensure they are correct.
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