CS 25J961 Fuel system hot weather operation
ED Decision 2005/006/R
For essential APUs:
(a) The fuel supply of an APU must perform
satisfactorily in hot weather operation. It must be shown that the fuel system
from the tank outlet to the APU is pressurised under all intended operations
so as to prevent vapour formation. Alternatively, it must be shown that there
is no evidence of vapour lock or other malfunctioning during a climb from the
altitude of the airport selected by the applicant to the maximum altitude
established as an operating limitation under CS
25J1527, with the APU
operating at the most critical conditions for vapour formation but not
exceeding the maximum essential load conditions. If the fuel supply is
dependant on the same fuel pumps or fuel supply as the main engines, the main
engines must be operated at maximum continuous power. The fuel temperature
must be at least 43°C at the start of the climb.
(b) The
test prescribed in sub-paragraph (a) of this paragraph may be performed in
flight or on the ground under closely simulated flight conditions. If a flight
test is performed in weather cold enough to interfere with the proper conduct
of the test, the fuel tank surfaces, fuel lines, and other fuel system parts
subject to cold air must be insulated to simulate, insofar as practicable,
flight in hot weather.
[Amdt 25/1]
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