(b)
[[Reserved.]

(c)
Where used with a reciprocating engine, it has an expansion space of not less than the greater of 10 percent of the tank capacity or 0.5 gallon, and where used with aturbine engine,ithas an expansion space of notlessthan10percent of thetank capacity.]

(d)
It is impossible to .ll the tank expansion space inadvertently with the rotorcraft in the normalground attitude;

(e)
Adequate venting is provided; and

(f)
There are means in the .ller opening to prevent oil over.ow from entering the oil tank compartment.

Amdt. 27-9, E.. 10/31/74
FAR27.1015 :[Oil tank tests.]
[Each oil tank must be designed and installed so that it can withstand, without leakage,aninternalpressureof5p.s.i., exceptthat eachpressurized oil tank used with a turbine engine must be designed and installed so that it can withstand, without leakage, an internal pressure of 5 p.s.i., plus the maximum operating pressure of the tank.] Amdt. 27-9, E.. 10-31-74
FAR 27.1017 : Oil lines and .ttings
(a)
Each oil line must be supported to prevent excessive vibration.

(b)
Each oil line connected to components of the rotorcraft between which relative mo-tioncould existmusthaveprovisionsfor .exibility.

(c)
Flexible hose must be approved.

(d)
Each oil line must have an inside diameter of not less than the inside diameter of the engine inlet or outlet. No line may have splices between connections.

FAR 27.1019 : Oil strainer or .lter

(a)
Each turbine engine installation must incorporate an oil strainer or .lter through which all of the engine oil .ows and which meets the following requirements :

(1)
Each oil strainer or .lter that has a bypass must be constructed and installed so that oil will .ow at the normal rate through the rest of the system with the strainer or .lter completely blocked.

(2)
The oil strainer or .lter must have the capacity (with respect to operating limitations established for the engine) to ensure that engine oil system func-tioningisnotimpaired whentheoiliscontaminated toadegree(with respect toparticle size anddensity) thatisgreaterthan that establishedfor the engine under Part 33 of this Chapter.

(3)
[The oil strainer or .lter, unless it is installed at an oil tank outlet, must incorporate a means to indicate contamination before it reaches the capacity establishedin accordance withparagraph(a)(2) of this section.]

(4)
The bypass of a strainer or .lter must be constructed and installed so that the release of collected contaminants is minimized by appropriate location of the bypasstoensurethatcollected contaminantsarenotinthebypass .owpath.

(5)
Anoil straineror .lterthathasnobypass,except onethatisinstalled at anoil tank outlet, must have a means to connect it to the warning system required in Sec. 27.1305(r).

(b) Each oil strainer or .lter in a powerplant installation using reciprocating engines must be constructed and installed so that oil will .ow at the normal rate through the rest of the system with the strainer or .lter element completely blocked.
Amdt. 27-23, E.. 10/3/88
FAR 27.1021 : Oil system drains
[Adrain(ordrains)mustbeprovided to allow safedrainage ofthe oil system.Each drain must–
(a)
Be accessible; and

(b)
Have manual or automatic means for positive locking in the closed position.] Amdt. 27-20, E.. 3/26/84

FAR 27.1027 : Transmissions and gearboxes : General

(a)
[Thelubricationsystemforcomponentsofthe rotordrivesystemthat requireconti-nuouslubrication mustbe su.cientlyindependent of thelubrication systems of the engine(s) to ensure lubrication during autorotation.]

(b)
Pressurelubrication systemsfortransmissionsandgearboxesmust comply with the engine oil system requirements ofSecs. 27.1013(exceptparagraph(d)),27.1015, 27.1017, 27.1021, and 27.1337(d).
　
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