ED Decision 2005/006/R
(a) Each APU 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 may not be less than the product of the endurance of the aeroplane and the maximum allowable oil consumption of the APU plus a suitable margin to ensure system circulation.
[Amdt 25/1]
CS 25A1017 Oil lines and fittings
ED Decision 2005/006/R
(a) Each oil line must meet the requirements of CS 25J993 and each oil line and fitting in any designated fire zone must meet the requirements of CS 25J1183.
(b) Breather lines must be arranged so that:
(1) Condensed water vapour that might freeze and obstruct the line cannot accumulate at any point;
(2) The breather discharge does not constitute a fire hazard;
(3) The breather does not discharge into the APU air intake system.
[Amdt 25/1]
ED Decision 2005/006/R
Where there is a filter in the APU lubrication system through which all the oil flows, it must be constructed and installed so that oil may flow at an acceptable rate through the rest of the system with the filter element completely blocked. An impending filter by-pass indication is required.
[Amdt 25/1]
ED Decision 2005/006/R
A drain (or drains) must be provided to allow safe drainage of the oil system. Each drain must:
(a) Be accessible; and
(b) Have manual or automatic means for positive locking in the closed position.
[Amdt 25/1]
ED Decision 2005/006/R
Each oil radiator must be able to withstand, without failure, any vibration, inertia, and oil pressure load to which it would be subjected in operation.
[Amdt 25/1]
ED Decision 2005/006/R
(a) Each oil shut-off must meet the requirements of CS 25J1189.
(b) Each oil valve must have positive stops or suitable index provisions in the "on'' and "off'' positions and must be supported so that no loads resulting from its operation or from accelerated flight conditions are transmitted to the lines attached to the valve, unless adequate strength margins under all loading conditions are provided in the lines and connections.
[Amdt 25/1]