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Advisory
Circular
Soojed?ESIGN CONSIDERATIONS FOR
MINIMIZING HAZARDS CAUSED BY
UNCONTAINED TURBINE ENGINE AND
AUXILIARY POWER UNTTROTOR
FAILURE
Dale: 3/25197
Ini'illed by: ANM- 110
AC NofO-
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I. PURPOSE. This advisory circular (AC) sets forth a method of compliance with the
requirements of
SS
23.90I(f), 23.903(b){1), 25.90I(d) and 25.903(d)(I) of the Federal Aviation
Regulations (FAR) pertaining to design precautions taken to minimize the hazards to an airplane
in the event of uncontained engine or auxiliary pOWerunit (APU) rotor failures. The guidance
provided within this AC is harmonized with that of the European Joint Aviation Authorities
(JAA) and is intended to provide a method of compliance that has been found acceptable. As
with all AC material, it is not mandatory and does not constitute a regulation.
2. CANCELLATION. Advisory Circular 20-128, "Design Considerations for Minimizing
Hazards Caused by Uncontained Turbine Engine and Auxiliary Power Unit Rotor and Fan Blade
Failures," dated March 9, 1988, is canceled.
3. APPLICABILITY This AC applies to part 23 and part 25 airplanes (and airplanes type-
certificated under predecessor parts 3 and 4b of the Civil Air Regulations) for which a new,
amended, or supplemental type certificate isY.quested.
4. RELATED DOCUMENTS. Sections 23.903, and 25.903 of the FAR, as amended
through Amendments 23-43 and 25-73 respectively, and other sections relating to uncontained
engine failures.
NOTE: APPENDIX I provides additional guidance for completion of the numerical analysis
requested in Paragraph 10of this AC.
a. Related Federal Aviation RelP'latjons. Sections which prescribe requirements for
the design, substantiation and certification relating to uncontained engine debris include:
S
23.863, 25.863
S
25.365
S
25.571
Flammable fluid fire protection
Pressurized compartment loads
Damage-tolerance and fatigue evaluation of
structure
FAA Form 1320-15
(4-82)
Supersedes
WA Form 1320-2
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