Downloaded from https://www.everyspec.com MIL-STD-3001-4(AS) o. Tolerances for electrical/electronic parts. Percentages or actual values or allowable tolerances for such items as nonmilitary standard resistors and capacitors shall be given as part of the description, expressed as plus and minus values. p. Undrilled or untrimmed parts. Parts that require drilling or trimming on installation shall be identified by a notation to that effect in the description. q. Make from instructions. Most parts source coded MO, MF, MH, or MG require manufacturing instructions in the maintenance WP.
These parts shall not have "Make From" information in the description column but will reference the maintenance WP. M-Series parts requiring only length, width or thickness and not requiring special manufacturing instructions shall include the raw bulk stock and final dimensions in the description. The list of raw (bulk) stock shall not be included for parts to be fabricated at depot level (SM&R coded MD). r. Items using liquid oxygen (LOX). Items using LOX shall be identified by the acronym LOX if hazardous conditions could result from lack of this information. The acronym shall be placed at the far right on the same line containing the nomenclature of the part. s.
Quick engine change assembly (QECA). (1) Repair parts, Government-furnished equipment and approved contractor-furnished accessories of an aircraft engine that also are included in the Quick Engine Change Assembly (QECA) shall be identified by the acronym "QEC" following the description of each repair part. The acronym shall appear at the far right on the same line containing the nomenclature of the part. (2) Following the breakdown of the quick engine change assembly, the part number and description of the Quick Engine Change Kit (QECK) shall be listed. All QECK parts shall be illustrated and indexed. (3) Basic aircraft engine parts shall not be identified with the acronym "QEC." t.
Magnetic control items (MAG). Parts requiring test for magnetic inclusion shall be identified by the acronym "MAG" to assist in the identification of such parts when malfunctions could result because of the lack of this information. The acronym shall appear at the far right on the same line containing the nomenclature of the part. u. Oversize and undersize parts (dimensional differences). When oversize or undersize parts are required and furnished and they are neither interchangeable with, nor within allowable production tolerances of the standard size part, they shall be listed by the part number specified in the contract drawing specification.
All dimensional differences shall be included in the description. v. Similar assemblies. (1) Peculiar parts notation. Parts peculiar to only one assembly shall be identified by a note in the description. (2) Different quantity notation. Identical parts that are used in different quantities on the assemblies shall be listed separately and identified by a note in the description. w. Matched parts (notation and parts listing). When two or more parts that would normally be procured as separate items have been machined to fit as a matched set or lapped assembly, or have been 25