(1)
Overspeedruns mustbe alternated with stabilizing runs offrom1 to5 minutes duration each at60 to80percent of maximum continuous speed.
(2)
[ Acceleration and deceleration must be accomplished in a period not longer than10 seconds(except where maximum engine accelerationrate will require more than10 seconds), and the timefor changing speeds may notbededucted from the speci.ed time for the overspeed runs.]
(3)
Overspeed runs must be made with the rotors in the .attest pitch for smooth operation.
(e)
Thetestsprescribedinparagraphs(b) and(d) ofthis section mustbe conducted on the rotorcraft and the torque must be absorbed by the rotors to be installed, exceptthatotherground or .ighttestfacilitieswith otherappropriatemethodsof torque absorption may be used if the conditions of support and vibration closely simulate the conditions that would exist during a test on the rotorcraft.
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Elodie Roux. Septembre 2003
Subpart E : Powerplant
(f) [Each test prescribed bythis section must be conducted without intervening disas-sembly and, exceptfor thelubrication systemfailure test requiredbyparagraph(c) of this section, eachpart tested mustbein a serviceable condition at the conclusion of the test.]
Amdt. 29-26, E.. 10/3/88
FAR 29.931 : Shafting critical speed.
(a)
[The critical speeds of any shafting must be determined by demonstration except that analytical methods may be used if reliable methods of analysis are available for the particular design.
(b)
If any critical speedlies within, or close to, the operating rangesforidling,power-on, and autorotative conditions, the stresses occurring at that speed must be within safe limits. This must be shown by tests.
If analytical methods are used and show that no critical speedlies within thepermissible operating ranges, the margins between the calculated critical speeds and the limits of the allowable operating ranges must be adequate to allowforpossible variationsbetween the computed and actual values.] Amdt. 29-12, E.. 2/1/77
FAR29.935 :Shaftingjoints.
Eachuniversaljoint, slipjoint, and other shaftingjoints whoselubricationis necessary for operation must have provision for lubrication.
FAR 29.939 : Turbine engine operating characteristics.
(a)
Turbine engine operating characteristics must be investigated in .ight to determine thatnoadversecharacteristics(suchasstall,surge,or .ameout) arepresent,to a hazardous degree, during normal and emergency operation within the range of operating limitations of the rotorcraft and of the engine.
(b)
The turbine engine air inlet system may not, as a result of air.ow distortion during normal operation, cause vibration harmful to the engine.
(c)
[For governor-controlledengines, it must be shown that there exists no hazardous torsional instability of the drive system associated with critical combinations of power, rotational speed, and control displacement.]
Amdt. 29-12, E.. 2/1/77
75.3 Fuel System
FAR 29.951 : General.
(a)
[Eachfuelsystemmustbeconstructed and arrangedtoensurea .owoffuel at arate andpressure establishedforproper engine and auxiliarypower unitfunctioning un-deranylikely operating conditions,including the maneuversforwhich certi.cation is requested and during which the engine or auxiliary power unit is permitted to be in operation.]
(b)
Each fuel system must be arranged so that–
(1)
No engine orfuelpump candrawfuelfrom morethan onetank at atime; or
(2)
There are means to prevent introducing air into the system.
(c) Each fuel system for a turbine engine must be capable of sustained operation throu-ghoutits .owandpressurerangewithfuelinitially saturated with waterat80'F. and having 0.75 cc. of free water per gallon added and cooled to the most critical condition for icing likely to be encountered in operation.
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本文链接地址：FAA规章 美国联邦航空规章 Federal Aviation Regulations 5(64)
