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AD/CF34/5 Amdt 2 - Fan Disks

Authoritative Version
AD/CF34/5 Amdt 2 Airworthiness Directives/Pt 106 — Engines as made
Fan Disks
Administered by: DOTARS
Exempt from sunsetting by the Legislative Instruments Act 2003 s 54(2) item 9
Registered 17 May 2007
Tabling HistoryDate
Tabled HR21-May-2007
Tabled Senate12-Jun-2007
Date of repeal 25 Oct 2007
Repealed by AD/CF34/5 Amdt 3 - Fan Disks

 

AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CF34/5 Amdt 1 and issues the following AD under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

General Electric Turbine Engines - CF34 Series

AD/CF34/5 Amdt 2

Fan Disks

6/2007

 

Applicability:

General Electric CF 34-1A, -3A, -3A1, -3A2, -3B and -3B1 series engines fitted with a fan disk, part number (P/N) 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05 or 6078T57G06.

Note 1:  These engines are installed on but not limited to Bombardier Canadair aeroplane models CL-600-2A12, -2B16, and -2B19.

Requirement:

1.    Remove from service fan disks listed by part number and serial number (S/N) in Table 1 of this AD.

Table 1 - Fan Disks that Require Removal

Disk P/N

6078T57G02
6078T00G01
6078T57G02
5922T01G04
6078T57G04
6078T57G04
6078T57G04
6078T57G04
6078T57G04
6078T57G05
6078T57G05
6078T57G05
6078T57G05
6078T57G04
6078T57G04
6078T57G04
6078T57G05
6078T57G05
6078T57G05
6078T57G05

Disk S/N

GAT6306N
GAT3860G
GAT1924L
GAT9599G
GEE05831
GEE06612
GEE06618
GEE06974
GEE06980
GEE143FY
GEE1453G
GEE14452
GEE145NA
GEE08086
GEE09287
GEE09337
GEE12720
GEE14214
GEE142YT
GEE146GT

 

 

2.    For CF34-3A1 and CF34-3B1 turbofan engines installed on Bombardier Canadair CL600-2B19 Regional Jet aeroplanes:

a.     On-wing Tactile and Enhanced Visual (TEV) inspect the fan disks listed by P/N and S/N in Table 1 of GE Alert Service Bulletin (ASB) No. CF34-AL S/B 72-A0231, dated 7 March 2007 in accordance with paragraphs 3.A. through 3.A.(13) of the Accomplishment Instructions of GE ASB No.
CF34-AL S/B 72-A0231.

b.    Fluorescent penetrant inspect (FPI), TEV inspect, and eddy current inspect (ECI) at shop-level for cracks and electrical arc-out defects on the fan disks listed by P/N and S/N in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 2, dated 22 March 2007 in accordance with paragraphs 3.A.(1) through 3.A.(6) of the Accomplishment Instructions of GE ASB No.
CF34-AL S/B 72-A0233.

Shop Level Exemption.

Fan disks are exempt from the shop-level inspections that meet the following criteria:

(1)   Fan disks inspected before the effective date of this AD per GE Engine Manual No. SEI-756, Section 72-21-00 (FAN ROTOR ASSEMBLY INSPECTION); and

(2)   That have accumulated no more than 100 cycles since that inspection; and

(3)   That pass the on-wing TEV inspection in Requirement 2a of this AD.

3.    For CF34-1A, -3A, -3A1, -3A2, and -3B turbofan engines installed on Bombardier Canadair Models CL-600-2A12 (CL-601), CL-600-2B16
(CL-601-3A), (CL-601-3R), and (CL-604) Business Jet aeroplanes:

FPI, TEV inspect, and ECI for cracks and electrical arc-out defects at shop-level on the fan disks listed by P/N and S/N in Table 1 of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2, dated 22 March  2007 in accordance with paragraphs 3.A. through 3.A.(10) of the Accomplishment Instructions of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2.

Previous Credit

Credit is allowed for fan disks previously shop-level inspected using GE ASB No. CF34-AL S/B 72-A0233, original issue, or Revision 1 of that ASB dated
16 March 2007, or GE ASB No. CF34-BJ S/B 72-A0212, dated 7 March 2007 or Revision 1 of that ASB dated 16 March 2007, before the effective date of this AD.

 

 

Note 2:  FAA AD 2007-07-07 Amdt 39-15012 dated 30 March 2007 refers.  This AD supersedes FAA AD 2006-05-04.

Compliance:

1.    For disks with fewer than 8000 cycles since new (CSN) as of the effective date of this AD, replace prior to accumulating 8000 CSN.

For disks with 8000 CSN or greater as of the effective date of this AD, replace within 15 days after the effective date of this AD.

2.    a.     In accordance with Table 2 of this AD.

Table 2. - Regional Jet On-Wing Fan Disk Inspection Compliance Times

For Fan Disks:

Inspect:

(i)    That have not had a shop-level inspection.

Within 500 flight hours after the effective date of this AD.

(ii)   That are marked with an asterisk in Table 1 of GE ASB No. CF34-AL S/B 72-A0231.

Within 500 flight hours after the effective date of this AD.

2.    b.    Within 5,000 flight hours or 5 calendar years after the effective date of this AD, whichever occurs first.

3.    In accordance with Table 3 of this AD.

Table 3. - Business Jet Shop-Level Fan Disk Inspection Compliance Times

For Fan Disks:

Inspect:

(i)    That have more than 5,500 flight hours on the effective date of this AD.

Within 500 flight hours after the effective date of this AD.

(ii)   That have 5,500 or fewer flight hours on the effective date of this AD.

Within accumulating a total of 6,000 fan disk operating hours-since-new, or 5 calendar years, whichever occurs first.

 

This Amendment becomes effective on 7 June 2007.

Background:

This AD was prompted by advice that electrical arc-out, most probably caused during an electro-chemical etch process, may be present in certain fan disks fitted to GE CF34 series engines.  This condition can result in cracking of the fan disk that can ultimately lead to disk rupture and uncontained engine failure.

 

 

Amendment 1 corrected an error in the first disk listed by part number and serial number of Table 1 of this AD.

Amendment 2 introduces additional inspection requirements.

The original issue of this AD became effective on 20 June 2001.

Amendment 1 of this AD became effective on 11 May 2006.


David Punshon
Delegate of the Civil Aviation Safety Authority

24 April 2007