Federal Aviation Administration, DOT

Section 23.2430

certificate in accordance with a standard accepted by the FAA that contains
airworthiness criteria the Administrator has found appropriate and applicable to the specific design and intended use of the engine or propeller
and provides a level of safety acceptable to the FAA.
(c) The applicant must construct and
arrange each powerplant installation
to account for - 
(1) Likely operating conditions, including foreign object threats;
(2) Sufficient clearance of moving
parts to other airplane parts and their
surroundings;
(3) Likely hazards in operation including hazards to ground personnel;
and
(4) Vibration and fatigue.
(d) Hazardous accumulations of
fluids, vapors, or gases must be isolated from the airplane and personnel
compartments, and be safely contained
or discharged.
(e) Powerplant components must
comply with their component limitations and installation instructions or
be shown not to create a hazard.

spaschal on DSK3GDR082PROD with CFR

Section 23.2405 Automatic power or thrust
control systems.
(a) An automatic power or thrust
control system intended for in-flight
use must be designed so no unsafe condition will result during normal operation of the system.
(b) Any single failure or likely combination of failures of an automatic
power or thrust control system must
not prevent continued safe flight and
landing of the airplane.
(c) Inadvertent operation of an automatic power or thrust control system
by the flightcrew must be prevented, or
if not prevented, must not result in an
unsafe condition.
(d) Unless the failure of an automatic
power or thrust control system is extremely remote, the system must - 
(1) Provide a means for the flightcrew
to verify the system is in an operating
condition;
(2) Provide a means for the flightcrew
to override the automatic function;
and
(3) Prevent inadvertent deactivation
of the system.

Section 23.2410 Powerplant installation hazard assessment.
The applicant must assess each powerplant separately and in relation to
other airplane systems and installations to show that any hazard resulting
from the likely failure of any powerplant system, component, or accessory
will not - 
(a) Prevent continued safe flight and
landing or, if continued safe flight and
landing cannot be ensured, the hazard
has been minimized;
(b) Cause serious injury that may be
avoided; and
(c) Require immediate action by any
crewmember for continued operation of
any remaining powerplant system.
Section 23.2415 Powerplant ice protection.
(a) The airplane design, including the
induction and inlet system, must prevent foreseeable accumulation of ice or
snow that adversely affects powerplant
operation.
(b) The powerplant installation design must prevent any accumulation of
ice or snow that adversely affects powerplant operation, in those icing conditions for which certification is requested.
Section 23.2420 Reversing systems.
Each reversing system must be designed so that - 
(a) No unsafe condition will result
during normal operation of the system;
and
(b) The airplane is capable of continued safe flight and landing after any
single failure, likely combination of
failures, or malfunction of the reversing system.
Section 23.2425 Powerplant operational characteristics.
(a) The installed powerplant must operate without any hazardous characteristics during normal and emergency operation within the range of operating
limitations for the airplane and the engine.
(b) The pilot must have the capability to stop the powerplant in flight
and restart the powerplant within an
established operational envelope.
Section 23.2430 Fuel systems.
(a) Each fuel system must - 

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