Underside of fuselage: 
 
 
  •         -fuel sump drain -check for leakage
  •         -cabin fresh air intake duct (P-51 scoop) - check clear
  • -check all visible drains for leakage and antennas for condition and security
  • Drains:    (from aft moving forward)
    • Front Cockpit Evaporator drain     (rubber hose)
    • Pitot line drain                                 (silver metal bulb)
    • Hydraulic Fluid Scupper drain       (small metal nipple)
    • Firewall Fuel drain                          (small metal nipple)
  • -check oil cooler exaust duct for FOD (engine wash connector located up inside duct)

 
 (allowable leakage: some fuel leakage from ram fuel vent is acceptable on hot days, none from any other drain.
purpose of fin on ram fuel vent= creates an airstream to carry any fuel drops away from the underside of fuselage, preventing pilots from smelling fuel fumes)