目前机上各指示系统有两种件号的灯泡，387和MS25237-387AS15，MS25237-387AS15在IPC中用在737NG驾驶舱头顶板各指示系统，387件号的灯泡通常用在客舱，同时备用灯泡盒内有387和387AS15等件号，两种件号在功能上一致，只是亮度有所不同，因此为了核实各灯泡的互换性，SR咨询了波音并申请了NTO。
About lamp PN MS25237-387AS15 and PN 387
A1: The lamps with AS15 is one way interchangeable with ones that do not have AS15 after dash number; in other words, P/N MS25237-387AS15 can replace P/N MS25237-387, but P/N MS25237-387 cannot replace P/N MS25237-387AS15.
A2: Boeing has No Technical Objection (NTO) to use lamps without suffix AS15 as temporary replacement. Once lamps P/N MS25237-387 and P/N 387 are out of HNA’s current stock, P/N MS25237-387AS15, 387AS15, or M6363-8-7AS15 needs to be used on the LIGHT ASSY – PRESS TO TEST IND.
SR号：4-5419041222