spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Pt. 25, App. K

(ii) Maximum duration flights with maximum duration diversions.
(iii) Maximum duration engine-inoperative
diversions distributed among the engines installed on the airplanes used for the airplane
demonstration flight test program. At least
two one-engine-inoperative diversions must
be conducted at maximum continuous thrust
or power using the same engine.
(iv) Flights under non-normal conditions
to demonstrate the flightcrew-s ability to
safely conduct an ETOPS diversion with
worst-case ETOPS significant system failures or malfunctions that could occur in
service.
(v) Diversions to airports that represent
airports of the types used for ETOPS diversions.
(vi) Repeated exposure to humid and inclement weather on the ground followed by a
long-duration flight at normal cruise altitude.
(2) The airplane demonstration flight test
program must validate the adequacy of the
airplane-s flying qualities and performance,
and the flightcrew-s ability to safely conduct
an ETOPS diversion under the conditions
specified in section K25.2.2(g)(1) of this appendix.
(3) During the airplane demonstration
flight test program, each test airplane must
be operated and maintained using the applicant-s recommended operating and maintenance procedures.
(4) At the completion of the airplane demonstration flight test program, each ETOPS
significant system must undergo an on-wing
inspection or test in accordance with the
tasks defined in the proposed Instructions

for Continued Airworthiness to establish its
condition for continued safe operation. Each
engine must also undergo a gas path inspection. These inspections must be conducted in
a manner to identify abnormal conditions
that could result in an IFSD or diversion.
The applicant must identify, track and resolve any abnormal conditions in accordance
with the problem tracking and resolution
system specified in section K25.2.2(h) of this
appendix.
(h) Problem tracking and resolution system.
(1) The applicant must establish and maintain a problem tracking and resolution system. The system must:
(i) Contain a process for prompt reporting
to the FAA office responsible for the design
approval of each occurrence reportable under
Section 21.4(a)(6) encountered during the phases of
airplane and engine development used to assess Early ETOPS eligibility.
(ii) Contain a process for notifying the
FAA office responsible for the design approval of each proposed corrective action
that the applicant determines necessary for
each problem identified from the occurrences
reported under section K25.2.2. (h)(1)(i) of
this appendix. The timing of the notification
must permit appropriate FAA review before
taking the proposed corrective action.
(2) If the applicant is seeking ETOPS type
design approval of a change to an airplaneengine combination previously approved for
ETOPS, the problem tracking and resolution
system need only address those problems
specified in the following table, provided the
applicant obtains prior authorization from
the FAA:

If the change does not require a new airplane type certificiate
and . . .

Then the Problem Tracking and Resolution System must address . . .

(i) Requires a new engine type certificate ..................................

(ii) Does not require a new engine type certificate .....................

All problems applicable to the new engine installation, and for
the remainder of the airplane, problems in changed systems
only.
Problems in changed systems only.

(i) Acceptance criteria. The type and frequency of failures and malfunctions on
ETOPS significant systems that occur during the airplane flight test program and the
airplane demonstration flight test program
specified in section K25.2.2(g) of this appendix must be consistent with the type and frequency of failures and malfunctions that
would be expected to occur on currently certificated airplanes approved for ETOPS.
K25.2.3. Combined service experience and
Early ETOPS method.
An applicant for ETOPS type design approval using the combined service experience
and Early ETOPS method must comply with
the following requirements.
(a) A service experience requirement of not
less than 15,000 engine-hours for the world

fleet of the candidate airplane-engine combination.
(b) The Early ETOPS requirements of
K25.2.2, except for the airplane demonstration specified in section K25.2.2(g) of this appendix; and
(c) The flight test requirement of section
K25.2.1(e) of this appendix.
K25.3. Airplanes with more than two engines.
An applicant for ETOPS type design approval of an airplane with more than two engines must use one of the methods described
in section K25.3.1, K25.3.2, or K25.3.3 of this
appendix.
K25.3.1 Service experience method.
An applicant for ETOPS type design approval using the service experience method
must comply with section K25.3.1(a) of this

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