TB 9-4931-537-24
c. When equivalent standards are used in lieu of those listed in table 1, the
organizational chief will develop a cross-check similar to the one specified for the standard
being replaced. This locally developed cross-check will be included in the cross-check record
files.
a. The ranges and parameters listed in table 1 have been determined to be adequate to
provide a reasonable check of the standards while at the same time causing a minimum loss
of productive calibration/repair time. The limits assigned are the square root of the sum of
the squares. The tolerances used for each standard were obtained from the technical
bulletin for the standard.
b. Table 1 has sufficient space for five consecutive cross-checks. Enter data legibly, in
blue or black ink, and show all significant digits of the required reading.
c. If a specific standard fails a cross-check, the organizational chief will determine the
action to be taken and document the decision. The action taken must ensure that all
TMDE calibrated with the failed standard are operating in accordance with the approved
calibration procedure. When re-calibration of the TMDE is the course of action, the TMDE
owner will be notified and will determine whether or not re-calibration is actually necessary
(based on usage of the instrument). If re-calibration is necessary, a mutually agreeable
schedule will be established to recalibrate the affected TMDE.
d. Documentation of corrective actions taken will be recorded when a standard fails a
cross-check. Documentation may be in the form of notations and explanations in the cross-
check table, where possible, or on separate pages attached to the table. Documentation
must be in sufficient detail so that an audit trail can confirm that no TMDE had been
adversely affected.
e. When a standard fails a cross-check and is determined to be unserviceable, the
cross-check readings must be recorded in appropriate table. The only exception permitted
is when the standard is inoperative. In such cases the designator INOP will be placed in
the space provided for the cross-check readings, and an explanation noted at the foot or
back of cross-check table.
f. When a standard fails between required cross-checks, an entry will be made in the
next available column of the table, with the date of failure discovery and actions taken in
accordance with d and e above.
g. At the completion of the calibration loop the organizational chief will ensure that all
cross-check records are reviewed and any required corrective action is accomplished. Cross-
check records must be retained for at least 2 years and then may be destroyed. Upon
request, a copy of the records will be forwarded to USATA.
10. Reports. Cross-check tables will be reproduced locally. All results of cross-checks
must be recorded in appropriate table and signed as listed in table. Inclusive dates may be
annotated on a single line if a cross-check takes more than 1 day.