This is so you can quickly jettison fuel tanks if needed
The F.E.N.C.E. Check
F - Firepower! (Master Arm, Master Mode, Weapons)
E - Electronic Countermeasures (ECM)
N - Navigation (HUD, HSI, Bullseye)
C - Chaff/Flare & Communications
E - Emitters (Radar, Lights, TACAN, radios, RADALT)