JAR 27.999 Fuel system drains
(a) There must be at least one accessible
drain at the lowest point in each fuel system to
completely drain the system with the rotorcraft
in any ground attitude to be expected in service.
(b) Each drain required by sub-paragraph
(a) of this paragraph must –
(1) Discharge clear of all parts of the
rotorcraft;
(2) Have manual or automatic means
to assure positive closure in the off position;
and
(3) Have a drain valve –
(i) That is readily accessible
and which can be easily opened and
closed; and
(ii) That is either located or
protected to prevent fuel spillage in the
event of a landing with landing gear
retracted.
OIL SYSTEM
JAR 27.1011 Engines: general
(a) Each engine must have an independent
oil system that can supply it with an appropriate
quantity of oil at a temperature not above that
safe for continuous operation.
(b) The usable oil capacity of each system
may not be less than the product of the
endurance of the rotorcraft under critical
operating conditions and the maximum oil
consumption of the engine under the same
conditions, plus a suitable margin to ensure
adequate circulation and cooling. Instead of a
rational analysis of endurance and consumption,
a usable oil capacity of 3.8 litres (0.83 Imperial
gallon /l US gallon) for each 151.4 litres (33.3
Imperial gallons/40 US gallons) of usable fuel
may be used.
(c) The oil cooling provisions for each
engine must be able to maintain the oil inlet
temperature to that engine at or below the
maximum established value. This must be
shown by flight tests.
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