Downloaded from https://www.everyspec.com MIL-STD-3001-4(AS) 5.3.9.5 Critical clearances work package critclwp >. This work package shall illustrate the specific critical clearance areas and identify the minimum allowable measurement that is required to ensure sufficient clearance exists in those areas (see figure 10). 5.3.10 Sequence control chart (engines only) . When specified by the requiring activity, a sequence control chart (SCC) shall be prepared. The SCC shall be a graphic presentation that will program the accomplishment of complete engine repair (CER) in a logical order.
The presentation shall contain the major CER tasks and their required sequence, oriented to actual work time and manpower utilization. Refer to MIL-HDBK-3001 for SCC presentation. 5.3.10.1 Upper portion SCC. The upper portion of the SCC shall contain the following: a. A table including identification of crew members, their rating (RTG), Military Occupational Specialty (MOS), and applicable WPs. (1) Crew member no. - Number assigned to each specialist (no. 1 is normally the crew leader). (2) RTG/MOS - The type of rating and MOS shall be determined in accordance with NAVPERS 18068 and MCO P1200.7. (3) Applicable WPs - The WP numbers of tasks assigned to each specialist.
The WPs are in the engine intermediate maintenance manual. b. Work Area Chart - An illustration of the engine with a breakdown of work areas numbered and identified in a legend. c. Title block with notation that chart is to be used with applicable work packages (WPs) in engine intermediate maintenance manual and other applicable technical manuals (corresponding MRCs and the applicable manuals containing tubing, piping and clamping maintenance). d. A table with blocks for job numbers, times and dates for four engines. e. A publication number, date and supersedure notice, when applicable. 5.3.10.2 Middle portion of SCC.
Blocks in the middle portion of the SCC shall be arranged to identify specific tasks in the logical sequence of accomplishment. The block width shall be lined up with the time brackets in the lower portion. The task title and number shall be the same as the intermediate maintenance manual. The WP number shall be placed in the upper right-hand corner of each block. The work area number(s) shall be located in the lower right-hand corner. WPs which contain major engine inspection requirements shall be identified by placing an asterisk before the WP number. Task assignments to specific crew members shall be shown at the left. Identification of the major engine inspection asterisk shall be shown.
5.3.10.3 Lower portion SCC. A graph coordinate for TIME shall be divided into equal vertical increments of one hour, and each hourly increment should be subdivided in six equal parts rated at ten minutes each. The graph shall display the total clock hours required to process the engine and individual tasks. In addition, the time allowed each crew member to accomplish specific tasks will permit a computation of manhours per task. If task time is excessive and could cause the length of the SCC to exceed 52 inches, a reduction of areas used to reflect time should be made by grouping large individual time lapses of more than two hours into smaller increments.
The tasks shall be listed by WP number in parentheses with the left parenthesis located at the time the task will begin and the right parenthesis at the 17