RESEARCH DIRECTORATELT–RN–013
REVISION 2 / PUBLIC EDITION
LATTICE / Retirement note
Retirement of a working specimen
Panel L-22 still responds within its last measured envelope. It has been withdrawn from service.
Material Behavior / calibration custody
SOURCE DATE 2026.08.18 / RELEASE DATE ABOVE
01 / Reason for withdrawal
The reference assembly used to calibrate L-22 was damaged during an unrelated workshop move. Its most recent independent check cannot be recovered. The panel still responds to the six bench profiles recorded in its last run. Repeating those profiles against the same surviving reference would not restore the lost independence.
02 / Disposition
Remove L-22 from the active specimen register and retain it in a passive fixture. It may be used for destructive examination after Material Behavior approves a separate work order. Its learned response is not to be copied into an operational replacement with an intact-calibration label. The replacement must acquire its own evidence.
03 / Custody correction
The initial instruction called for the calibration packet to be destroyed on removal from the active register. The Records Office identified that packet as evidence needed for later examination. The instruction has been corrected to require transfer to inactive custody. The packet had not been destroyed; the correction changes the disposition, not the panel’s status.
Revision history / 2 retained entries
REVISION 1 / 2026.08.18 / Internal source issue
Original custody instruction, superseded before public release.
SUPERSEDED INSTRUCTION — RETAINED FOR THE RECORD
Destroy the calibration packet on removal from the active register.
REVISION 2 / 2026.09.19 / First public edition
Replaced destruction with transfer to inactive custody. Section 03 records the correction; no released experimental finding was changed.