[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR33.39]

[Page 776]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 33_AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES--Table of Contents
 
    Subpart C_Design and Construction; Reciprocating Aircraft Engines
 
Sec.  33.39  Lubrication system.

    (a) The lubrication system of the engine must be designed and 
constructed so that it will function properly in all flight attitudes 
and atmospheric conditions in which the airplane is expected to operate. 
In wet sump engines, this requirement must be met when only one-half of 
the maximum lubricant supply is in the engine.
    (b) The lubrication system of the engine must be designed and 
constructed to allow installing a means of cooling the lubricant.
    (c) The crankcase must be vented to the atmosphere to preclude 
leakage of oil from excessive pressure in the crankcase.