MIL-DTL-24784/7C(NAVY)
3.9.2 Chapter 2 - examination, tests, and corrective actions. This chapter shall include maintenance
requirements and associated actions, and shall include the following information.
3.9.2.1 Pre-overhaul and repair maintenance inspection. Examinations and inspections required prior to and
during repair and refurbishment to determine the need for work in addition to that prescribed by planned overhaul or
repair maintenance (see 6.4.6), commensurate with prescribed levels of maintenance shall be specified. The method
of examination of inspection shall be described and acceptance and rejection criteria specified. Examples of items
and examination and inspection criteria are in 3.9.2.5.
3.9.2.2 Pre-overhaul and repair performance or other evaluation tests. Performance or other evaluation tests
necessary for item failure diagnosis and for the determination of requirements for corrective maintenance in addition
to that prescribed by planned overhaul or repair maintenance shall be specified. Testing and evaluation
requirements shall be scaled to the activity level of maintenance and shall specify the detailed steps for test
accomplishment.
3.9.2.3 Corrective maintenance actions. Corrective maintenance actions appropriate to the level of
maintenance which are acceptable to correct deficiencies found during pre-overhaul and repair performance tests
and examinations and inspections shall be specified (see 6.2). Corrective actions include replacement, repair, or
refurbishment. Where corrective actions must be accomplished and certified in accordance with a specific
procedure, the TRS shall invoke the applicable procedure.
3.9.2.4 Recording results. Methods for recording inspection and examination results, and corrective actions
taken shall be specified. Distribution requirements for reports shall be identified.
3.9.2.5 Inspection and acceptance criteria. Inspection and acceptance criteria shall include the following (see
a.
Items that are subject to wear, corrosion, erosion, and aging shall be examined and tested to see whether
such wear or other deterioration would ultimately result in failure to meet performance specifications.
Specific acceptance criteria shall be furnished in the TRS for each such item. The criteria shall be based on
actual wear, corrosion, erosion, and aging data when such data are available. These criteria shall be based
on ensuring satisfactory performance for the planned period of service between refurbishments for the
particular item. The criteria, in many instances, are a matter of engineering judgment when wear or
deterioration rates have not been established for shipboard operating conditions.
b.
Where specific parts are mentioned, the part number (NSN, national item identification number,
manufacturers or Government part number as applicable), and applicable reference document shall be
written in the TRS text to minimize the possibility of misunderstanding.
c.
When the technical manual includes charts of clearances and tolerances, this information may be used as a
starting point in specifying allowable wear. The following list illustrates typical examples of items and
applicable criteria of acceptability:
(1) Bushings or bearings and mating shafts. Clearances or dimensions.
(2) Pump wear rings or rotors. Clearances or dimensions.
(3) Thrust bearings. End play.
(4) Gear trains. Backlash, contact pattern, and alignment.
(5) Pressure containing parts. Wall thickness (thinnest area, erosion path, or both), and leakage rate.
(6) Couplings and shafts. Alignment and clearance.
(7) Piping, valves, fittings. Thickness and leakage rate.
(8) Operating mechanisms. Backlash or play.
(9) Cylinders and pistons. Clearances, diameters, and leakage rate.
(10) Valves, disks, and seats. Dimensions for important parts, seat angles, seat rings, ball diameters.
(11) Electrical wire. Insulation resistance.
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