The requirements presented in this document cover the design factors which might cause any part of an electrically motor driven fuel pump assembly to act as an ignition source for explosive fuel vapors within the airplane tank. Purpose This Aerospace Recommended Practice (ARP) provides fuel booster pump design considerations commensurate with industry requirements for prevention of ignition of explosive fuel vapors and the confinement of spark-initiated explosions by means of mechanical design features@ including flame-suppressing devices. Guidelines are presented for proper design of fuel pumps and systems to meet the intent of 14CFR 25.981 and FAA AC 25.981-1C for in-tank ignition sources and the general safety requirements of MIL-STD-882. In addition@ recommendations are presented for proper testing algorithms to determine safe fuel pump design that prevents excessive external surface temperature.