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All fuel delivery systems, including portable systems, will be fitted with filtration of the water block-ing (Go-No-Go) type meeting the specifications of API 1583, which locks fuel flow when water is present.
Fuel filter canisters should be clearly marked with the next date of change or inspection cycle, and data recorded in an appropriate inspection record.
All filters should be replaced at nominated pressure differentials as annotated on the filter housing or as recommended by the manufacturer, but as a minimum will be replaced annually.
All fuel storage supplies, including drums, should be allowed to settle 1 hour for each 1 foot of fuel depth after the tanks have been resupplied or barrels moved to vertical, before samples are taken and fuel is approved for use. Fuel tanks should have a sign placed on the tank during settling, indicating the time at which the tank can be used (settling is complete). If the fuel system is serviced by only one tank, the fuel dispensing unit will also have a sign with wording as noted for the bulk tank.
All steel tanks should be lined with an approved epoxy liner unless the tanks are constructed of stainless steel.
All fuel supply tanks should be installed with a slope and have a sump drain at the tank low point for sampling purposes and should have a fuel quantity sight gauge.
The preferred plumbing for fuel systems is stainless steel and connections welded. If common steel is used it must be lined with an approved epoxy.
Only personnel who have received formal documented initial and recurrent training should be used for refuelling aircraft. Aviation services can be of assistance in providing a sample training programme.
All fuel system static grounds should have continuity checks performed periodically, annually as a minimum.
It is recommended that frangible “witness” seals be used on tank openings, especially transport tanks, after filling to allow verification that contents are untampered.
7.4.2 Aircraft fuel system sampling guidelines
All required fuel samples as noted in the paragraphs below should be retained until flights are com-pleted for that day. At remote locations, when refuelled by a commercial fuel vendor, it may not be practicable to retain fuel samples.
The following should be sampled daily, with a minimum individual sample size as noted below into a clear jar with a screw top, each tested for water, and marked with the sample source:
a) Aircraft fuel tank sumps drained and sampled into one container prior to the first flight of each day (. litre minimum sample size, unless specified differently by the airframe or water detection device manufacturer).
b) Each fuel tank sump (2.0 litres).
c) Each fuel filter and monitor (2.0 litres).
d) Each fuel nozzle, prior to first refuelling of the day (2.0 litres).
It is also recommended that the water test capsule results be retained with the samples.
Transport fuel tanks: Fuel going into the fuel transport tanks from fuel trucks/bulk systems must be “certified” (see paragraph 7.4.3.e below) fuel, before filling the tanks a clear/bright and water test should be completed, and results noted on the tank records. If the fuel does not pass these tests or is not from a “certified” source, then it should be rejected.
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飞机管理指导方针 Aircraft management guidelines(38)
