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Applicability
(c) This AD applies to CFM International CFM56-5 and -5B series turbofan engines:
(1) With an exhaust gas temperature (EGT) upper harness part number (P/N) CA170-00, with a
serial number (SN):
(i) Listed in Table 1, Table 4, or Table 5 of CFM56 Service Bulletin (SB) No. CFM56-5B S/B
77-0008, Revision 3, dated April 4, 2005, or
(ii) Listed in Table 1 or Table 4 of CFM56 SB No. CFM56-5 S/B 77-0020, Revision 3, dated
April 4, 2005.
(2) With an EGT lower harness P/N CA171-00, with a SN:
(i) Listed in Table 2, Table 4, or Table 5 of CFM56 SB No. CFM56-5B S/B 77-0008, Revision
3, dated April 4, 2005; or
(ii) Listed in Table 2 or Table 4 of CFM56 SB No. CFM56-5 S/B 77-0020, Revision 3, dated
April 4, 2005.
(3) With an EGT coupling P/N CA172-02 with a SN:
(i) Listed in Table 3, Table 4, or Table 5 of CFM56 Service Bulletin (SB) No. CFM56-5B S/B
77-0008, Revision 3, dated April 4, 2005, or
(ii) Listed in Table 3 or Table 4 of CFM56 SB No. CFM56-5 S/B 77-0020, Revision 3, dated
April 4, 2005.
(4) These engines are installed on, but not limited to Airbus Industrie A318, A319, A320, and
A321 airplanes.
Unsafe Condition
(d) This AD results from CFM International adding subsequently certified engine models,
CFM56-5B3/P1, CFM56-5B3/2P1, CFM56-5B4/P1, and CFM56-5B4/2P1, to the list of engines that
could have affected harnesses installed, and increasing the population of affected EGT harnesses. We
are issuing this AD to prevent unexpected deterioration of critical rotating engine parts due to higher
than desired engine operating EGTs.
2007-03-15 2
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Compliance
(e) You are responsible for having the actions required by this AD performed within the
compliance times specified unless the actions have already been done.
(f) If an EGT harness or EGT coupling has a serial number that is followed by the letter “W”, no
further action is required for that part.
(g) For affected EGT harnesses and EGT couplings identified using paragraph (c) of this AD,
with fewer than 3,000 engine flight hours-since-installation, do the following:
(1) Replace affected EGT harnesses and EGT couplings, not being trend monitored, with
serviceable parts within 500 flight hours after the effective date of this AD; or
(2) After the effective date of this AD:
(i) Review the smooth data EGT trend via the System for Analysis of Gas Turbine Engines
(SAGE), or equivalent, since the affected components were first installed on the current engine.
(ii) Continue this trend monitoring for the affected EGT harnesses and EGT couplings to ensure
that the system does not show a minimum of 30 [deg]C downward (i.e. cooler) indication, or more,
without a corresponding change in other associated engine parameters such as N1 (LPT rotor speed),
N2 (HPT rotor speed), and fuel flow.
(iii) Provided that there is sufficient, actual EGT margin to do so, replace the EGT harnesses and
EGT couplings within 100 flight hours after they have been determined to be defective.
(iv) Continue to monitor the EGT indications for 3,000 engine flight hours since the first
installation on the current engine.
Terminating Action
(h) Any of the following three conditions is terminating action for the trend monitoring
requirements specified in paragraphs (g)(2)(i) through (g)(2)(iv) of this AD:
(1) Replacing an EGT harness and EGT coupling with a serviceable part, or
(2) Replacing an EGT harness and EGT coupling with an EGT harness and EGT coupling that
has a letter “W” following the SN, or
(3) Accumulating 3,000 engine flight hours on an EGT harness and EGT coupling.
Alternative Methods of Compliance
(i) The Manager, Engine Certification Office, has the authority to approve alternative methods of
compliance for this AD if requested using the procedures found in 14 CFR 39.19.
Related Information
(j) Airworthiness directive No. F-2003-001 R2, dated June 8, 2005, which is from the Direction
Generale de L'Aviation Civile airworthiness authority for France, also addresses the subject of this
AD.
(k) Contact James Rosa, Aerospace Engineer, Engine Certification Office, FAA, Engine and
Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238-
7152; fax (781) 238-7199; e-mail: james.rosa@faa.gov for more information about this AD.
2007-03-15 3
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Material Incorporated by Reference
(l) You must use the CFM56 Service Bulletin Tables specified in the compliance of this AD, to
determine applicability to this AD. The following Table 1 lists the Service Bulletins. The Director of
the Federal Register approved the incorporation by reference of the documents listed in Table 1 of
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