Airworthiness Directive · Amendment 39-14501 · General Electric Company CF34 Series Turbofan Engines
General Electric Company CF34 Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2007-07-07. Comply with the one in force.
This AD applies to General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines. These engines are installed on, but not limited to, Bombardier, Inc. 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 currently requires a onetime inspection, and if necessary replacing certain fan disks for electrical arc-out indications. That AD also reduces the life limit of certain fan disks. This AD requires the same actions and adds one disk part number (P/N) and serial number (SN) to the affected fan disks. This AD results from an error in the first part number and serial number listed in Table 1 of the original AD. We are issuing this AD to prevent rupture of the fan disk due to cracks that initiate at an electrical arc-out, which could result in an uncontained failure of the engine.
On disk P/Ns 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06, that are listed by P/N and SN in the following Table 1 of this AD and that have fewer than 8,000 cycles-since-new (CSN) on the effective date of this AD, replace fan disk P/Ns 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 disks with SNs listed in Table 1 of this AD that have 8,000 CSN or more on the effective date of this AD, replace the disk within 30 days after the effective date of this AD.
Inspect all other fan disks, P/Ns 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06 in accordance with paragraphs 3.A.(1) through 3.E.(2) of the Accomplishment Instructions of GE Alert Service Bulletin (ASB) CF34-BJ 72-A0088, Revision 1, dated October 30, 2000 or paragraphs 3.A.(1) through 3.A.(2)(f) of the Accomplishment Instructions of GE ASB CF34-AL 72-A0103, dated August 4, 2000. Use the compliance times specified in the following Table 2:
| Fan disk operating CSN | Inspect |
|---|---|
| (1) Fewer than 8,000 CSN on effective date of this AD | Before accumulating 8,000 CSN or by the next hot section inspection after the effective date of this AD, whichever the occurs earlier. |
| (2) 8,000 CSN or more on the effective date of this AD | Within 120 days after the effective date of this AD. |
(i) For the purposes of this AD, the following definitions apply:
(1) A serviceable fan disk is defined as a fan disk that has been inspected as specified in paragraph (h) of this AD and is not listed in Table 1 of this AD.
(2) Cycles-since-new for fan disk P/N 5922T01G04 or 5922T01G05 is defined as total cycles accrued since new as P/N 6078T57G02 or 6078T57G03, added to total cycles accrued after modification from P/N 6078T57G02 or 6078T57G03.
