[Federal Register Volume 68, Number 198 (Tuesday, October 14, 2003)]
[Rules and Regulations]
[Pages 59104-59106]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 03-25864]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2001-NE-21-AD; Amendment 39-13337; AD 2003-05-10R1]
RIN 2120-AA64


Airworthiness Directives; General Electric Company CF34-3A1, -3B, 
and -3B1 Turbofan Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment revises an existing airworthiness directive 
(AD), that applies to General Electric Company (GE) CF34-3A1, -3B, and 
-3B1 turbofan engines with scavenge screens part numbers (P/Ns) 
4047T95P01 and 5054T86G02 installed in the B-sump oil scavenge system. 
That AD currently requires initial and repetitive visual inspections 
and cleaning of the B-sump scavenge screens until a screenless fitting 
is installed. This amendment requires the same initial and repetitive 
visual inspections and cleaning of the B-sump scavenge screens until a 
screenless fitting is installed. This amendment also corrects a 
typographical error, and introduces a less restrictive terminating 
action schedule. This amendment is prompted by the need to correct a 
typographical error and by the need to introduce a less restrictive 
terminating action schedule. We are issuing this AD to prevent B-sump 
scavenge screen blockage due to coking which could result in ignition 
of B-sump oil in the secondary air system, fan drive shaft separation, 
and uncontained engine failure.

DATES: Effective November 18, 2003. The incorporation by reference of 
certain publications, listed in the regulations, was approved 
previously by the Director of the Federal Register as of April 2, 2003 
(68 FR 12806; March 18, 2003).

ADDRESSES: The service information referenced in this AD may be 
obtained from GE Aircraft Engines, 1000 Western

[[Page 59105]]

Avenue, Lynn, MA 01910; Attention: CF34 Product Support Engineering, 
Mail Zone: 34017; telephone (781) 594-6323; fax (781) 594-0600. This 
information may be examined, by appointment, at the Federal Aviation 
Administration (FAA), New England Region, Office of the Regional 
Counsel, 12 New England Executive Park, Burlington, MA; or at the 
Office of the Federal Register, 800 North Capitol Street, NW., suite 
700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Barbara Caufield, Aerospace Engineer, 
Engine Certification Office, FAA, Engine and Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803-5299; telephone (781) 
238-7146; fax (781) 238-7199.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) by revising AD 2003-05-10, 
Amendment 39-13086 (68 FR 12806, March 18, 2003), which applies to GE 
CF34-3A1, -3B, and -3B1 turbofan engines with scavenge screens P/Ns 
4047T95P01 and 5054T86G02 installed in the B-sump oil scavenge system 
was published in the Federal Register on July 8, 2003 (68 FR 40573). 
That action proposed to require the same initial and repetitive visual 
inspections and cleaning of the B-sump scavenge screens until a 
screenless fitting is installed as in AD 2003-05-10. That action also 
proposed to correct a typographical error, and introduces a less 
restrictive terminating action schedule in accordance with GE Alert 
Service Bulletin (ASB) CF34-AL S/B 79-A0014, Revision 3, dated January 
31, 2003; ASB CF34-BJ S/B 79-A0015, Revision 3, dated January 31, 2003; 
GE ASB CF34-AL S/B 79-A0016 and ASB CF34-BJ S/B 79-A0017, both dated 
June 17, 2002.

Comments

    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. No comments were received on the 
proposal or the FAA's determination of the cost to the public. The FAA 
has determined that air safety and the public interest require the 
adoption of the rule as proposed.

Regulatory Analysis

    This final rule does not have federalism implications, as defined 
in Executive Order 13132, because it would not have a substantial 
direct effect on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Accordingly, 
the FAA has not consulted with state authorities prior to publication 
of this final rule.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under the DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a 
significant economic impact, positive or negative, on a substantial 
number of small entities under the criteria of the Regulatory 
Flexibility Act. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it may be obtained 
by contacting the Rules Docket at the location provided under the 
caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. Section 39.13 is amended by removing Amendment 39-13086 (68 FR 
12806, March 18, 2003) and by adding a new airworthiness directive, 
Amendment 39-13337, to read as follows:

2003-05-10R1 General Electric Company: Amendment 39-13337. Docket 
No. 2001-NE-21-AD. Revises AD 2003-05-10, Amendment 39-13086.

Applicability

    This airworthiness directive (AD) applies to General Electric 
Company (GE) CF34-3A1, -3B, and -3B1 turbofan engines with scavenge 
screens part numbers (P/Ns) 4047T95P01 and 5054T86G02 installed in 
the B-sump oil scavenge system. These engines are installed on, but 
not limited to, Bombardier Inc. (Canadair) Model CL-600-2A12, CL-
600-2B16, and CL-600-2B19 airplanes.

    Note 1: This AD applies to each engine identified in the 
preceding applicability provision, regardless of whether it has been 
modified, altered, or repaired in the area subject to the 
requirements of this AD. For engines that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must request approval for an 
alternative method of compliance in accordance with paragraph (d) of 
this AD. The request should include an assessment of the effect of 
the modification, alteration, or repair on the unsafe condition 
addressed by this AD; and, if the unsafe condition has not been 
eliminated, the request should include specific proposed actions to 
address it.

Compliance

    Compliance with this AD is required as indicated, unless already 
done.
    To prevent B-sump scavenge screen blockage due to coking, which 
could result in ignition of B-sump oil in the secondary air system, 
fan drive shaft separation, and uncontained engine failure, do the 
following:

Initial Inspection and Cleaning of B-Sump Screens

    (a) Perform an initial visual inspection and cleaning of 
scavenge screens, P/Ns 4047T95P01 and 5054T86G02, installed in the 
B-sump oil scavenge system, in accordance with Paragraphs 3A through 
3B of the Accomplishment Instructions of GE Aircraft Engines (GE) 
Alert Service Bulletin (ASB) CF34-AL S/B 79-A0014, Revision 3, dated 
January 31, 2003; or ASB CF34-BJ S/B 79-A0015, Revision 3, dated 
January 31, 2003; and the following table:

                Initial Inspection and Cleaning Schedule
------------------------------------------------------------------------
Engine hours time-since-new (TSN) or time-
       since-last-shop-visit (TSLSV)              Inspect and clean
------------------------------------------------------------------------
(1) Fewer than 4,000 hours TSN or fewer     Before 4,000 hours TSN or
 than 4,000 hours TSLSV if it can be         TSLSV.
 confirmed that both the B-sump scavenge
 screens were cleaned and the B-sump and
 combustor frame (strut tubes) were
 removed from the engine and cleaned at
 that prior shop visit.
(2) Fewer than 1,000 hours TSLSV if it can  Before 1,000 hours TSLSV.
 NOT be confirmed that both the B-sump
 scavenge screens were cleaned and the B-
 sump and combustor frame (strut tubes)
 were removed from the engine and cleaned
 at that prior shop visit.

[[Page 59106]]

 
(3) 4,000 hours or greater TSN or 4,000     Within 500 hours time-in-
 hours or greater TSLSV if it can be         service (TIS) after the
 confirmed that both the B-sump scavenge     effective date of this AD.
 screens were cleaned and the B-sump and
 combustor frame (strut tubes) were
 removed from the engine and cleaned at
 that prior shop visit, or 1,000 hours or
 greater TSLSV if it can NOT be confirmed
 that both the B-sump and combustor frame
 (strut tubes) were removed from the
 engine and cleaned at that prior shop
 visit.
------------------------------------------------------------------------

Repetitive Inspections and Cleaning

    (b) Perform repetitive visual inspections and cleaning of 
scavenge screens, P/Ns 4047T95P01 and 5054T86G02, installed in the 
B-sump oil scavenge system, in accordance with Paragraphs 3A through 
3B of the Accomplishment Instructions of GE ASB CF34-AL S/B 79-
A0014, Revision 3, dated January 31, 2003; and ASB CF34-BJ S/B 79-
A0015, Revision 3, dated January 31, 2003; and the following:
    (1) At intervals not to exceed 200 hours time-since-last-
inspection (TSLI), if no coke is found in screens during initial or 
any prior inspections, or
    (2) At intervals not to exceed 100 hours TSLI, if coke is found 
in screens during initial or any prior inspections.

Terminating Actions

    (c) Install new screenless fittings or fittings that have been 
reworked to remove the screens, in the B-sump oil scavenge system, 
in accordance with GE ASB CF34-AL S/B 79-A0016, dated June 17, 2002; 
or ASB CF34-BJ S/B 79-A0017, dated June 17, 2002, and the following 
schedule:
    (1) For engines with more than 4,000 hours TSN, within 500 hours 
TIS after the effective date of this AD, or within 1,000 hours 
TSLSV, whichever occurs first.
    (2) For engines with less than or equal to 4,000 hours TSN, 
prior to 4,500 hours TSN.
    This constitutes terminating action to the inspections required 
in paragraph (b) of this AD.

Alternative Methods of Compliance

    (d) An alternative method of compliance or adjustment of the 
compliance time that provides an acceptable level of safety may be 
used if approved by the Manager, Engine Certification Office (ECO). 
Operators must submit their request through an appropriate FAA 
Principal Maintenance Inspector, who may add comments and then send 
it to the Manager, ECO.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this airworthiness directive, 
if any, may be obtained from the ECO.

Special Flight Permits

    (e) Special flight permits may be issued in accordance with 
Sec. Sec.  21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the airplane to a location where 
the requirements of this AD can be done.

Documents That Have Been Incorporated by Reference

    (f) The actions must be done in accordance with the following 
General Electric Company Alert Service Bulletins (ASB):

----------------------------------------------------------------------------------------------------------------
            Document No.                      Pages                 Revision                     Date
----------------------------------------------------------------------------------------------------------------
ASB CF34-AL S/B....................  All...................  3.....................  January 31, 2003.
79-A0014...........................
Total Pages: 10....................
ASB CF34-BJ S/B....................  All...................  3.....................  January 31, 2003.
79-A0015...........................
Total Pages: 9.....................
ASB CF34-AL S/B....................  All...................  Original..............  June 17, 2002.
79-A0016...........................
Total Pages: 12....................
ASB CF34-BJ S/B....................  All...................  Original..............  June 17, 2002.
79-A0017...........................
Total Pages: 11....................
----------------------------------------------------------------------------------------------------------------

    This incorporation by reference of General Electric Alert 
Service Bulletin (ASB) CF34-AL S/B 79-A0014, Revision 3, dated 
January 31, 2003; ASB CF34-BJ S/B 79-A0015, Revision 3, dated 
January 31, 2003; GE ASB CF34-AL S/B 79-A0016 and ASB CF34-BJ S/B 
79-A0017, both dated June 17, 2002, was approved by the Director of 
the Federal Register on April 2, 2003, (68 FR 12086; March 18, 2003) 
in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be 
obtained from GE Aircraft Engines, 1000 Western Avenue, Lynn, MA 
01910; Attention: CF34 Product Support Engineering, Mail Zone: 
34017; telephone (781) 594-6323; fax (781) 594-0600. Copies may be 
inspected at the FAA, New England Region, Office of the Regional 
Counsel, 12 New England Executive Park, Burlington, MA; or at the 
Office of the Federal Register, 800 North Capitol Street, NW, suite 
700, Washington, DC.

Effective Date

    (g) This amendment becomes effective on November 18, 2003.

    Issued in Burlington, Massachusetts, on October 6, 2003.
Francis A. Favara,
Acting Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. 03-25864 Filed 10-10-03; 8:45 am]
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