Airworthiness Directive · Amendment 39-15012 · General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines
General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines
This AD applies to General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines, with fan disks part numbers (P/Ns) 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06 installed. These engines are installed on, but not limited to, Bombardier Canadair airplane models CL-600-2A12, -2B16, and -2B19.
The FAA is superseding an existing airworthiness directive (AD) for General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines. That AD requires a onetime inspection of certain fan disks for electrical arc-out indications, replacing fan disks with electrical arc-out indications, and reducing the life limit of certain fan disks. This AD requires the same reduced life limit of certain fan disks, but requires on-wing inspection of certain fan disks installed on regional jets within 500 flight hours after the effective date of this AD. This AD also requires more enhanced shop-level inspections of all fan disks for electrical arc-out defects. This AD results from a report that in January 2007, a CF34-3B1 turbofan engine experienced an uncontained fan disk failure during flight operation. We are issuing this AD to prevent an uncontained fan disk failure and airplane damage.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
For fan disks listed by P/N and SN in the following Table A that have fewer than 8,000 cycles-since-new (CSN) on the effective date of this AD, replace fan disks before accumulating 8,000 CSN:
| Disk part No. | Disk serial No. |
|---|---|
| 6078T57G02 | GAT6306N |
| 6078T00G01 | GAT3860G |
| 6078T57G02 | GAT1924L |
| 5922T01G04 | GAT9599G |
| 6078T57G04 | GEE05831 |
| 6078T57G04 | GEE06612 |
| 6078T57G04 | GEE06618 |
| 6078T57G04 | GEE06974 |
| 6078T57G04 | GEE06980 |
| 6078T57G05 | GEE143FY |
| 6078T57G05 | GEE1453G |
| 6078T57G05 | GEE14452 |
| 6078T57G05 | GEE145NA |
| 6078T57G04 | GEE08086 |
| 6078T57G04 | GEE09287 |
| 6078T57G04 | GEE09337 |
| 6078T57G05 | GEE12720 |
| 6078T57G05 | GEE14214 |
| 6078T57G05 | GEE142YT |
| 6078T57G05 | GEE146GT |
(g) For fan disks listed in Table A of this AD that have 8,000 CSN or more on the effective date of this AD, replace the disk within 15 days after the effective date of this AD.
For CF34-3A1 and CF34-3B1 turbofan engines installed on Bombardier Canadair CL600-2B19 Regional Jet airplanes:
(1) On-wing TEV inspect the fan disks listed by P/N and SN in Table 1 of GE Alert Service Bulletin (ASB) No. CF34-AL S/B 72-A0231, dated March 7, 2007, using the compliance times specified in the following Table B:
| 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, dated March 7, 2007 | Within 500 flight hours after the effective date of this AD. |
(2) Use paragraphs 3.A. through 3.A.(13) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0231, dated March 7, 2007, to do the inspection.
(3) Within 5,000 flight hours or 5 calendar years after the effective date of this AD, whichever occurs first, 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 SN in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 2, dated March 22, 2007.
(4) Use paragraphs 3.A.(1) through 3.A.(6) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0233, Revision 2, dated March 22, 2007, to do the inspections.
(5) Fan disks are exempt from the shop-level inspection that meet the following criteria:
(i) 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
(ii) That have accumulated no more than 100 cycles since that inspection; and
(iii) That pass the on-wing TEV inspection in paragraph (h)(2) of this AD.
(i) 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 airplanes:
(1) FPI, TEV inspect, and ECI for cracks and electrical arc-out defects at shop-level on the fan disks listed by P/N and SN in Table 1 of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2, dated March 22, 2007, using the compliance times specified in the following Table C:
| 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. |
(2) Use paragraphs 3.A. through 3.A.(10) of the Accomplishment Instructions of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2, dated March 22, 2007, to do the inspections.
Report the results of the on-wing inspections performed in paragraph (h)(2) by following the instructions in paragraph 3.A.(14) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0231, dated March 7, 2007. Under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements contained in this AD, and has assigned OMB Control Number 2120-0056.
Credit is allowed for fan disks previously shop-level inspected using GE ASB No. CF34-AL S/B 72-A0233, dated March 7, 2007 or Revision 1 of that ASB dated March 16, 2007, or GE ASB No. CF34-BJ S/B 72-A0212, dated March 7, 2007 or Revision 1 of that ASB dated March 16, 2007, before the effective date of this AD.
