§29.1011 Engines: General

(a) Each engine must have an independent oil system t hat can suppl y i t wi th an appropriate quantity of oil at a temperature not above that safe for continuous operation. (b) The usable oil cap acity of each system may not be less than the product of t he endurance of the rotorcraft under critical operating conditions and the maximum al lowable oi l consum ption of the engine under the sam e conditions, plus a suitable margin to ensure adequat e circulation and cooling. Instead of a rat ional anal ysis of endurance and consum ption, a usabl e oi l capaci ty of 3.8 litres (0.83 Imperial gallon/1 US gallon) for each 151 litres (33.3 Im perial gallons/40 US gallons) of usabl e fuel m ay be used for reciprocating engine installations. (c) Oil-fuel ratios lower than those prescribed in sub-paragraph (b) m ay be used if they are substantiated by dat a on t he oi l consumption of the engine. (d) The ab ility o f th e en gine o il co oling provisions to maintain the o il tem perature at o r below t he m aximum est ablished value must be shown under the appl icable requi rements of C S 29.1041 to 29.1049.