Environmental Engineering Reference
In-Depth Information
Table 12.3 Provisions for
the design and construction of
Auxiliary Power Units
Requirement
Contents
CS-APU 210
Safety analysis
CS-APU 220
Fire prevention
CS-APU 230
Air intake
CS-APU 240
Lubrication system
CS-APU 250
Fuel system
CS-APU 260
Exhaust system
CS-APU 270
Cooling
CS-APU 280
Over-speed safety devices
CS-APU 290
Rotor containment
CS-APU 300
Vibration
CS-APU 310
Life limitations
CS-APU 320
Bleed air contamination
CS-APU 330
Continued rotation
• Subpart D: Turbine engines, design, and construction;
• Subpart E: Turbine engines, type substantiation; and
• Subpart F: Turbine engines, environmental, and operational design requirements.
Fuel venting (CS-E 1010) and engine emissions (CS-E 1020) belong to Subpart F.
For Self Diagnosis, the CS-E 1020 has a decisive character. It must be dem-
onstrated that the engine type design complies with the emission specification of
CS 34.2 in effect at date of engine certification.
12.2.4 Certification of Auxiliary Power Units
The Joint Aviation Requirements for Auxiliary Power Units (JAR-APU) are based
on the FAA's Technical Standard Order TSO-C77a [
27
]. Subpart A provides the
airworthiness requirements for the issue of Joint Technical Standard Order (JTSO)
authorizations for turbine powered APUs used on an aircraft [
28
].
The relevant EASA, Subpart B design and construction regulations for all types
are contained in Table
12.3
[
29
].
APU 250 and 260 deal with fuel consumption and emissions. In accordance
with these requirements the exhaust gas systems must be designed and constructed
to prevent leakage of exhaust gases into the aircraft. The exhaust piping has to be
constructed of fireproof and corrosion resistant materials.
The relevant EASA regulations of Subpart C for all APU type substantiations
are shown in Table
12.4
.
Subpart D contains the additional requirements (see Table
12.5
).
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