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Federal Aviation Administration, DOT 

Pt. 25, App. K 

(ii) Maximum duration flights with max-

imum duration diversions. 

(iii) Maximum duration engine-inoperative 

diversions distributed among the engines in-
stalled 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 fail-
ures or malfunctions that could occur in 

(v) Diversions to airports that represent 

airports of the types used for ETOPS diver-

(vi) Repeated exposure to humid and in-

clement weather on the ground followed by a 
long-duration flight at normal cruise alti-

(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 ap-

(3) During the airplane demonstration 

flight test program, each test airplane must 
be operated and maintained using the appli-
cant’s recommended operating and mainte-
nance procedures. 

(4) At the completion of the airplane dem-

onstration 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 inspec-
tion. 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 re-
solve any abnormal conditions in accordance 
with the problem tracking and resolution 
system specified in section K25.2.2(h) of this 


Problem tracking and resolution system. 

(1) The applicant must establish and main-
tain a problem tracking and resolution sys-
tem. The system must: 

(i) Contain a process for prompt reporting 

to the FAA office responsible for the design 
approval of each occurrence reportable under 
§ 21.4(a)(6) encountered during the phases of 
airplane and engine development used to as-
sess Early ETOPS eligibility. 

(ii) Contain a process for notifying the 

FAA office responsible for the design ap-
proval 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 airplane- 
engine 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 ad-

dress . . . 

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

All problems applicable to the new engine installation, and for 

the remainder of the airplane, problems in changed systems 

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

Problems in changed systems only. 


Acceptance criteria. 

The type and fre-

quency of failures and malfunctions on 
ETOPS significant systems that occur dur-
ing the airplane flight test program and the 
airplane demonstration flight test program 
specified in section K25.2.2(g) of this appen-
dix must be consistent with the type and fre-
quency of failures and malfunctions that 
would be expected to occur on currently cer-
tificated airplanes approved for ETOPS. 


Combined service experience and 

Early ETOPS method. 

An applicant for ETOPS type design ap-

proval 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 com-

(b) The Early ETOPS requirements of 

K25.2.2, except for the airplane demonstra-
tion specified in section K25.2.2(g) of this ap-
pendix; and 

(c) The flight test requirement of section 

K25.2.1(e) of this appendix. 


Airplanes with more than two engines. 

An applicant for ETOPS type design ap-

proval of an airplane with more than two en-
gines must use one of the methods described 
in section K25.3.1, K25.3.2, or K25.3.3 of this 


Service experience method. 

An applicant for ETOPS type design ap-

proval using the service experience method 
must comply with section K25.3.1(a) of this 

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