[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR34.62]

[Page 773]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 34--FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES--Table of Contents
 
    Subpart G--Test Procedures for Engine Exhaust Gaseous Emissions 
               (Aircraft and Aircraft Gas Turbine Engines)
 
Sec. 34.62  Test procedure (propulsion engines).

    (a)(1) The engine shall be tested in each of the following engine 
operating modes which simulate aircraft operation to determine its mass 
emission rates. The actual power setting, when corrected to standard day 
conditions, should correspond to the following percentages of rated 
output. Analytical correction for variations from reference day 
conditions and minor variations in actual power setting should be 
specified and/or approved by the Administrator:

------------------------------------------------------------------------
                                                     Class
                Mode                 -----------------------------------
                                          TP      TF, T3, T8      TSS
------------------------------------------------------------------------
Taxi/idle...........................         (*)         (*)         (*)
Takeoff.............................         100         100         100
Climbout............................          90          85          65
Descent.............................          NA          NA          15
Approach............................          30          30          34
------------------------------------------------------------------------
*See paragraph (a) of this section.

    (2) The taxi/idle operating modes shall be carried out at a power 
setting of 7% rated thrust unless the Administrator determines that the 
unique characteristics of an engine model undergoing certification 
testing at 7% would result in substantially different HC and CO 
emissions than if the engine model were tested at the manufacturers 
recommended idle power setting. In such cases the Administrator shall 
specify an alternative test condition.
    (3) The times in mode (TIM) shall be as specified below:

------------------------------------------------------------------------
                                                     Class
                Mode                 -----------------------------------
                                          TP      TF, T3, T8      TSS
------------------------------------------------------------------------
Taxi/idle...........................   26.0 Min.   26.0 Min.   26.0 Min.
Takeoff.............................         0.5         0.7         1.2
Climbout............................         2.5         2.2         2.0
Descent.............................         N/A         N/A         1.2
Approach............................         4.5         4.0         2.3
------------------------------------------------------------------------

    (b) Emissions testing shall be conducted on warmed-up engines which 
have achieved a steady operating temperature.

[Doc. No. 25613, 55 FR 32861, Aug. 10, 1990; 55 FR 37287, Sept. 10, 
1990, as amended by Amdt. 34-3, 64 FR 5559, Feb. 3, 1999]