Fuel sampling procedure
PTP Cessna 172 B1 LOC FOT SGH R/I MEL TS B2 LOC FOT SGH R/I MEL TS This fuel sampling procedure is required to be carried out before preflight. With the airplane in the normal ground attitude and starting at the highest drain location, check all drain locations for contaminants before every flight, whether or not refueling has occurred. Have fuel sample disposal provisions, proper lighting, and a small ladder at your disposal to properly check for fuel tank system contamination. Drain at least one cup of fuel (using a clear sampler cup) from each drain location. Drain the fuel strainer as required to completely flush its contents in each of the fuel selector positions. Check for water, clarity, cloudiness, haze, proper fuel type/grade (i.e.; 100LL is light blue in tint, jet fuel is clear or ye...