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ADs updated daily at www.Tdata.com
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| 2022-09-14 |
GENERAL ELECTRIC COMPANY: Amendment 39-22034; Docket No. FAA-2021-1167; Project Identifier AD-2021-00823-E. |
(a) EFFECTIVE DATE
This airworthiness directive (AD) is effective June 24, 2022.
(b) AFFECTED ADS
This AD replaces AD 2019-22-05, Amendment 39-19784 (84 FR 63569,
November 18, 2019).
(c) APPLICABILITY
This AD applies to General Electric Company (GE) CF34-8C1, CF34-8C5,
CF34-8C5A1, CF34-8C5B1, CF34-8C5A2, CF34-8C5A3, CF34-8E2, CF34-8E2A1,
CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E6 and CF34-8E6A1 model turbo-
fan engines.
(d) SUBJECT
Joint Aircraft System Component (JASC) Code 7532, Compressor Bleed
Valve.
(e) UNSAFE CONDITION
This AD was prompted by multiple reports of fuel leaks, some leading
to engine fires, which have occurred as a result of malfunctions
related to the operability bleed valve (OBV). The FAA is issuing this
AD to prevent failure of the OBV. The unsafe condition, if not
addressed, could result in an engine fire and damage to the airplane.
(f) COMPLIANCE
Comply with this AD within the compliance times specified, unless al-
ready done.
(g) REQUIRED ACTIONS
(1) For CF34-8C1, CF34-8C5, CF34-8C5A1, and CF34-8C5B1 model turbofan
engines with serial numbers (S/Ns): 965101 through 965670 inclusive;
194101 through 194999 inclusive; and 195101 through 195653 inclusive:
(i) Within 880 flight hours (FHs) since the previous inspection, 500 FHs
after December 23, 2019 (the effective date of AD 2019-22-05) or 6,880
FHs since new, whichever occurs later, inspect the OBV bleed air mani-
fold link rod assemblies, the OBV fuel fittings, and the OBV fuel
tubes.
(ii) Thereafter, within every 880 FHs since the previous inspection, per-
form additional repeat inspections of the OBV bleed air manifold link
rod assemblies, the OBV fuel fittings, and the OBV fuel tubes.
(iii) Use the Accomplishment Instructions, paragraph 3.B., of GE CF34-8C
Service Bulletin (SB) 75-0020 R04, dated May 10, 2019 (GE SB 75-
0020), to perform inspections required by paragraphs (g)(1)(i) and
(ii) of this AD and, per the inspection criteria in paragraph 3.B.,
of GE SB 75-0020 (the inspection criteria), do the following:
(A) Before further flight, if fuel leakage is observed at the OBV fuel
fittings or the OBV fuel fittings are loose, replace the OBV with a
part eligible for installation.
(B) Before further flight, if any OBV fuel tube clamp is found to be out-
side the inspection criteria, re-torque the OBV fuel tube clamp or re-
place the OBV fuel tube clamp.
(C) Within 50 flight cycles (FCs) after the inspections required by para-
graphs (g)(1)(i) and (ii) of this AD, replace any link rod hardware
found to be outside the inspection criteria. Until the worn link rod
hardware is replaced, the OBV fuel fittings must be inspected before
the first flight of each day for leakage and looseness in accordance
with the inspection criteria. If the OBV fuel fittings fail to meet
the inspection criteria, before further flight, replace the OBV and
worn link rod hardware.
(2) For CF34-8C5B1 model turbofan engines with S/Ns not listed in para-
graph (g)(1) of this AD and for all CF34-8C5A2 and CF34-8C5A3 model
turbofan engines, perform the following:
(i) Within 880 FHs after the effective date of this AD or prior to accumu-
lating 6,880 FHs since new, whichever occurs later, perform an initial
inspection of the OBV bleed air manifold link rod assemblies, OBV fuel
fittings, and OBV fuel tubes.
(ii) Thereafter, within every 880 FHs since the last inspection, repeat
the inspection of the OBV bleed air manifold link rod assemblies, OBV
fuel fittings, and OBV fuel tubes.
(iii) Use the Accomplishment Instructions, paragraph 3.B., of GE SB 75-
0020, to perform the inspections in paragraph (g)(2)(i) and (ii) of
this AD and, per the inspection criteria in paragraph 3.B., of GE SB
75-0020, do the following:
(A) Before further flight, if fuel leakage is observed at the OBV fuel
fittings or the OBV fuel fittings are loose, replace the OBV with a
part eligible for installation.
(B) Before further flight, if any OBV fuel tube clamp is found to be out-
side the inspection criteria, re-torque the OBV fuel tube clamp or re-
place the OBV fuel tube clamp.
(C) Within 50 FCs after the inspections required by paragraphs (g)(2)(i)
and (ii) of this AD, replace any link rod hardware found to be outside
the inspection criteria. Until the worn link rod hardware is replaced,
the OBV fuel fittings must be inspected before the first flight of
each day for leakage and looseness in accordance with the inspection
criteria. If the OBV fuel fittings fail to meet the inspection
criteria, before further flight, replace the OBV and worn link rod
hardware.
(3) For all affected engines with an installed OBV, VIN 5000728-104 part
number (P/N) (P/N 4123T71P02), VIN 5000728-106 (P/N 4123T71P03) or VIN
5080046-101 (P/N 4123T71P04), having an OBV S/N listed in Appendix A,
paragraph 4., of GE CF34-8C SB 75-0025 R01 dated August 1, 2019 (GE SB
75-0025), or Appendix A, paragraph 4., of GE CF34-8E SB 75-0019 R01,
dated August 1, 2019 (GE SB 75-0019), respectively, within 180 days
after the effective date of this AD, remove the OBV and replace with a
part eligible for installation.
(4) For all affected engines with an installed OBV, VIN 5000728-104 (P/N
4123T71P02), VIN 5000728-106 (P/N 4123T71P03), or VIN 5080046-101 (P/N
4123T71P04), having an OBV S/N not listed in Appendix A, paragraph 4.,
of GE SB 75-0025 or Appendix A, paragraph 4., of GE SB 75-0019, re-
spectively, remove the OBV and replace with a part eligible for in-
stallation within the following compliance times:
(i) For an OBV that has accumulated more than 25,000 FHs since new as of
the effective date of this AD, remove and replace the OBV within 16
months of the effective date of this AD.
(ii) For an OBV that has accumulated between 12,500 to 25,000 FHs since
new, inclusive, as of the effective date of this AD, remove and re-
place the OBV within 32 months of the effective date of this AD.
(iii) For an OBV with fewer than 12,500 FHs since new as of the effective
date of this AD, remove and replace the OBV within 48 months of the
effective date of this AD.
(5) For all affected engines with an installed OBV, VIN 5080046-102 (P/N
4123T71P05), before the OBV accumulates 25,000 FHs since new or within
10 years of the effective date of this AD, whichever occurs first, re-
move the OBV and replace with a part eligible for installation.
(6) For all affected engines with an installed OBV, if the accumulated FHs
since new of the OBV is unknown, use the FHs since new of the engine.
(7) If the OBV was upgraded or the OBV cap was replaced using the service
information identified in paragraph 1., Planning Information, para-
graph C., Compliance, of GE CF34-8E SB 75-0021 R00, dated February 21,
2020, the accumulated FHs since the OBV was upgraded or accumulated
FHs since the OBV cap was replaced, as applicable, may be used instead
of accumulated FHs since new of the OBV.
(h) TERMINATING ACTION
Installation of an OBV that meets the definition of a part eligible
for installation in paragraph (i) of this AD constitutes terminating
action for the inspections required by paragraphs (g)(1) and (2) of
this AD.
(i) DEFINITION
For the purpose of this AD, a "part eligible for installation" is an
OBV VIN 5080046-103 (P/N 4123T71P06) or an OBV reworked to VIN 5080046
-103 (P/N 4123T71P06).
(j) NO REPORTING REQUIREMENT
The reporting instructions specified in GE SB 75-0020 are not required
by this AD.
(k) CREDIT FOR PREVIOUS ACTIONS
You may take credit for the initial inspection required by paragraph
(g)(1)(i) or (2)(i) of this AD if you performed this initial inspec-
tion before the effective of this AD using GE CF34-8C SB 75-0019 R01,
dated October 24, 2017, or R00, dated August 4, 2017; or GE CF34-8C-AL
S/B 75-0020, Revision 03, dated December 14, 2018, as applicable.
(l) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)
(1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for
this AD, if requested using the procedures found in 14 CFR 39.19. In
accordance with 14 CFR 39.19, send your request to your principal
inspector or local Flight Standards District Office, as appropriate.
If sending information directly to the manager of the ECO Branch, send
it to the attention of the person identified in paragraph (m) of this
AD and email to: ANE-AD-AMOC@faa.gov.
(2) Before using any approved AMOC, notify your appropriate principal in-
spector, or lacking a principal inspector, the manager of the local
flight standards district office/certificate holding district office.
(m) RELATED INFORMATION
For more information about this AD, contact Scott Stevenson, Aviation
Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA
01803; phone: (781) 238-7132; fax: (781) 238-7199; email: Scott.M.
Stevenson@faa.gov.
(n) MATERIAL INCORPORATED BY REFERENCE
(1) The Director of the Federal Register approved the incorporation by
reference (IBR) of the service information listed in this paragraph
under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do the actions
required by this AD, unless the AD specifies otherwise.
(3) The following service information was approved for IBR on June 24,
2022.
(i) GE CF34-8C Service Bulletin (SB) 75-0025 R01, dated August 1, 2019.
(ii) GE CF34-8E SB 75-0019 R01, dated August 1, 2019.
(4) The following service information was approved for IBR on December 23,
2019 (84 FR 63569, November 18, 2019).
(i) GE CF34-8C SB 75-0020 R04, dated May 10, 2019.
(ii) [Reserved]
(5) For service information identified in this AD, contact General Elec-
tric Company, 1 Neumann Way, Cincinnati, OH 45215; phone: (513) 552-
3272; email aviation.fleetsupport@ge.com; website: https://www.ge.com.
(6) You may view this service information at FAA, Airworthiness Products
Section, Operational Safety Branch, 1200 District Avenue, Burlington,
MA 01803. For information on the availability of this material at the
FAA, call (817) 222-5110.
(7) You may view this service information that is incorporated by refer-
ence at the National Archives and Records Administration (NARA). For
information on the availability of this material at NARA, email: fr.
inspection@nara.gov, or go to: https://www.archives.gov/federal-
register/cfr/ibr-locations.html.
Issued on May 16, 2022. Gaetano A Sciortino, Deputy Director for Strategic
Initiatives, Compliance & Airworthiness Division, Aircraft Certification
Service.
FOR FURTHER INFORMATION CONTACT: Scott Stevenson, Aviation Safety Engineer
ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781)
238-7132; fax: (781) 238-7199; email: Scott.M.Stevenson@faa.gov.
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