•  Troubleshooting and repairing broken circuits in  landing light wiring circuits •  Replacing bulbs, reflectors, and lenses of position and  landing lights •  Replacing wheels for which no weight and balance  computation is involved •  Replacing any cowling not requiring removal of the  propeller or disconnection of flight controls •  Replacing or cleaning spark plugs and setting spark  plug gap clearance •  Replacing any hose connection, except hydraulic  connections •  Replacing prefabricated fuel lines •  Cleaning or replacing fuel and oil strainers or filter  elements •  Replacing and servicing batteries •  Replacing or adjusting nonstructural standard  fasteners incidental to operations  •  Removing, checking, and replacing magnetic chip  detectors 6-9