MOP = DR
Internal Fluid-carrying Passages Filled with Preservativele
PRESERVE BY METHOD 30 AS FOLLOWS: EACH UNIT SHALL HAVE ALL INTERNAL FLUID-CARRYING PASSAGES, WHICH ARE NOT PRELUBRICATED, FILLED WITH THE SPECIFIED PRESERVATIVE, ALLOWING SPACE FOR INTERNAL THERMAL EXPANSION. IF FILLING IS NOT PRACTICAL, THE UNIT SHALL BE INTERNALLY FOG-SPRAYED OR FLUSHED, THEN DRAINED TO THE DRIP POINT. ALL PORTS, FITTINGS, OPENINGS, ETC., SHALL BE CAPPED OR PLUGGED WITH NON-CORROSIVE (NON-INTERACTING) METAL CAPS OR PLUGS CONFORMING TO NAS 847 OR EQUIVALENT. ALL HYDRAULIC PRESERVATIVE OPERATING FLUID USED SHALL BE FILTERED THROUGH A 3 MICRON ABSOLUTE FILTER PRIOR TO BEING USED AS SPECIFIED ABOVE. EXTERIOR BARE METAL SURFACES, SUBJECT TO CORROSION, SHALL BE COATED WITH COMPOUND CONFORMING TO MIL-PRF-16173, GRADE 2 OR MIL-C-11796, CLASS 3. UNIT SHALL BE WRAPPED WITH A GREASEPROOF WRAP CONFORMING TO MIL-PRF-121 OR EQUIVALENT; SEAL SEAMS WITH ASTM-D5486 TAPE TO EFFECT A MEASURE OF WATERPROOFNESS AND PREVENT UNWRAPPING. THE UNIT MUST BE ADEQUATELY CUSHIONED WITH MATERIAL SPECIFIED AND PLACED IN A GRADE V3C CONTAINER FABRICATED IN ACCORDANCE WITH ASTM-D5118 (AS A MINIMUM), STYLE FOL OR CSSC. ALL SEAMS, CORNERS, AND MANUFACTURER'S JOINT SHALL BE TAPE-SEALED WITH TWO INCH TAPE CONFORMING TO ASTM-D5486, TYPE III OR IV.
| Field | MOP — Method of Preservation |
|---|---|
| Code | DR |
| Meaning | Internal Fluid-carrying Passages Filled with Preservativele |
Last updated 2026-05-26. Published by DAITK™ against the U.S. Defense Logistics Agency (DLA) FLIS code dictionary, governed by DoD 4100.39-M — the authoritative U.S. Government cataloging reference. Authorized reference data, reproduced with attribution, not scraped.