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more specific set of definitions to use when an engine occurrence has taken place.
Contact point for all CICTT work:
CICTT@intlaviationstandards.org
Page Revised 9/2008 Page 2
CASE BURNTHROUGH (SCF–PP–CB)
A local case penetration that initiates from local overtemperature of the case external wall
due to an internal engine malfunction (e.g., fuel nozzle leakage, internal bearing
compartment fires, titanium fires).
Usage Notes:
• Burnthroughs are distinguished from ruptures by their lack of an explosive release of high
pressure gas.
• Events involving accessory component cases also contribute to this category; for example,
sump fires that propagate internally and result in burnthrough of piping or that initiate
gearbox fires.
• The key aspect, whether in the primary gas path or accessories, is that fire initiates from an
internal malfunction and proceeds to burn through a case, tube, or gearbox to reach external
regions.
NOTE: A common cause of case burnthrough is localized penetration due to fuel
nozzle malfunction.
CASE RUPTURE (SCF–PP–CR)
The sudden rupture of a high-pressure vessel or case with the resultant release of
high-pressure gases into the under-cowl cavity.
Usage Notes:
• Case ruptures resulting from uncontained release of debris from a rotating component
malfunction are excluded.
• Case ruptures include those events that propagate from fatigue-type cracks as well as
ruptures related to secondary malfunctions (e.g., flame impingement).
COMPARTMENT OVERHEAT/AIR LEAK (SCF–PP–COAL)
High-pressure or temperature air leaks due to casing or high-pressure /temperature air
duct system malfunctions within the nacelle or in the pylon.
Usage Notes:
• None at this time.
Page Revised 9/2008 Page 3
COWL SEPARATION (SCF–PP–CS)
Separation of nacelle components such as inlets, cowls, thrust reversers, exhaust nozzles,
tail plugs, etc.
Usage Notes:
• Events resulting from ground contact are excluded.
ENGINE FAILURE RECOGNITION AND RESPONSE (SCF–PP–EFRR)
An event initiating from a single propulsion system (including propeller system)
malfunction, which, by itself, does not hazard the aircraft, but is compounded by
sub-optimal response (i.e., crew did not execute checklist/normal flying duties).
Usage Notes:
• Not counted are cases of gross error or negligence (such as deciding to take off with an
engine known to be inoperative).
NOTE: An example is an IFSD followed by crew failure to maintain airspeed that leads to stall
and loss of control.
ENGINE OVERSPEED (SCF–PP–EOS)
Acceleration of engine rotating components to a speed above that sanctioned in the
type-certificate datasheet.
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SYSTEM/COMPONENT FAILURE OR MALFUNCTION (POWERPLANT) (SCF–PP) SUB-CATEGORY DEFINITIONS AND USAGE NOTES(3)
