ED Decision 2003/18/RM
(a) There must be at least one drain to allow safe drainage of the entire fuel system with the aeroplane in its normal ground attitude.
(b) Each drain required by sub-paragraph (a) of this paragraph and CS-VLA 971 must -
(1) Discharge clear of all parts of the aeroplane;
(2) Have manual or automatic means for positive locking in the closed 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.
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