Airworthiness Directive · Amendment 39-14975 · General Electric Company (GE) CF6-80C2 Turbofan Engines
General Electric Company (GE) CF6-80C2 Turbofan Engines
This AD applies to the following General Electric Company (GE) turbofan engines with cast titanium assembly engine mount platforms part numbers (P/Ns) 1292M13G06, 1301M28G08, 1459M70G07, and 1846M24G04 and cast titanium assembly engine mount yokes P/Ns 9383M43G14 and 9383M43G16 installed.
CF6-80C2A1
CF6-80C2A2
CF6-80C2A3
CF6-80C2A5
CF6-80C2A8
CF6-80C2A5F
CF6-80C2B1
CF6-80C2B2
CF6-80C2B4
CF6-80C2B6
CF6-80C2B1F
CF6-80C2B2F
CF6-80C2B4F
CF6-80C2B5F
CF6-80C2B6F
CF6-80C2B6FA
CF6-80C2B7F
CF6-80C2B8F
CF6-80C2D1F
These engines are installed on, but not limited to, Boeing 747, Boeing 767, MD-11 and Airbus A300-600 and A310 airplanes.
The FAA is adopting a new airworthiness directive (AD) for GE CF6-80C2 series turbofan engines. This AD requires replacing certain installed part number (P/N) and serial number (SN) cast titanium weld- repaired forward engine mount platforms and cast titanium forward mount yokes, with a forged titanium or a non-welded cast titanium part. This AD results from the discovery of cracks, in a weld-repaired area on a forward engine mount platform and a forward engine mount yoke, found during a fluorescent penetrant inspection (FPI). These parts were weld- repaired during manufacture. We are issuing this AD to prevent cracks in the forward engine mount platform and forward engine mount yoke that could result in possible separation of the engine from the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Table 1 of this AD lists the P/Ns and serial numbers (SNs) of the weld-repaired forward engine mount platforms that have a weld repair in a non-redundant area of the mount and must be replaced.
| P/Ns | SNs |
|---|---|
| 1292M13G06 or 1846M24G04 | WACHH228 WACHH254 |
| WACHH285 | |
| WACHH290 | |
| WACHH292 | |
| WACHH295 | |
| WACHH299 | |
| WACHH384 | |
| WACHH427 | |
| WACHH440 | |
| WACHH604 | |
| 1301M28G08 | WACAR292 |
| WACAR354 |
(g) Table 2 of this AD lists the P/Ns and SNs of the weld-repaired forward engine mount platforms that have a weld repair in a redundant area of the mount. Because it is impossible to detect whether the mount is operating on the redundant feature, each of these mounts must be replaced. The compliance time for mounts in this category can be longer than for the mounts listed in Table 1 of this AD.
| P/Ns | SNs |
|---|---|
| 1292M13G06 or 1846M24G04 | WACHH173 WACHH189 |
| WACHH274 | |
| WACHH278 | |
| WACHH314 | |
| WACHH325 | |
| WACHH486 | |
| 1301M28G08 | WACAR294 |
| WACAR304 | |
| WACAR353 | |
| WACAR372 | |
| 1459M70G07 | MTXT1282 |
(h) Table 3 of this AD lists the P/Ns and SNs of the weld-repaired forward engine mount yokes that have a weld repair in a redundant area of the yoke. Because it is impossible to detect whether the mount yoke is operating on the redundant feature, each of these mount yokes must be replaced. The compliance time for mounts in this category can be longer than for the mounts listed in Table 1 of this AD.
| P/Ns | SNs |
|---|---|
| 9383M43G14 | WACV0388 |
| WACV0394 | |
| WACV0405 | |
| WACV0406 | |
| WACV0477 | |
| WACV0498 | |
| WACV0529 | |
| WACV0556 | |
| WACV0579 | |
| WACV0581 | |
| WACV0582 | |
| WACV0600 | |
| WACV0605 | |
| WACV0617 | |
| WACV0625 | |
| WACV0627 | |
| WACV0633 | |
| WACV0645 | |
| WACV0683 | |
| WACV0703 | |
| WACV0733 | |
| WACV0737 | |
| WACV0759 | |
| WACV0775 | |
| WACV0791 | |
| WACV0799 | |
| WACV0875 | |
| WACV0883 | |
| WACV0885 | |
| WACV0909 | |
| WACV1097 | |
| WACV1615 | |
| WACV1713 | |
| WACV1753 | |
| WACV1797 | |
| WACV1867 | |
| WACV1987 | |
| WACV2131 | |
| WACV2159 | |
| WACV2185 | |
| WACV2343 | |
| WACV2511 | |
| WACV2695 | |
| WACV2707 | |
| WACV2881 | |
| WACV2899 | |
| 9383M43G16 | WACV0511 |
| WACV0515 | |
| WACV0518 | |
| WACV0540 | |
| WACV0542 | |
| WACV0571 | |
| WACV0689 | |
| WACV0721 | |
| WACV0727 | |
| WACV0730 | |
| WACV0786 | |
| WACV0816 | |
| WACV0954 |
(i) GE advises that forward engine mount platform, P/Ns 1292M13G06 and 1846M24G04, are the same, except that P/N 1846M24G04 incorporates a previously approved field rework. This rework allows the thrust pin hole in the forward engine mount platform to be bored out to accept installation of an oversized thrust pin. GE cannot identify which SN goes with which P/N, but all SNs are affected.
If the P/N and SN of the forward engine mount platform listed in Table 1 and Table 2 and the forward engine mount yoke listed in Table 3 of this AD are not installed on the engine, no further action is necessary.
(k) If the P/N and SN of the forward engine mount platform listed in Table 1 of this AD is installed on the engine:
(1) Remove the forward engine mount platform from the engine within 500 cycles or 6 months, after the effective date of this AD, whichever occurs first.
(2) Information for removal of the forward engine mount platform from the engine can be found in the CF6-80C2 Engine Manual, 72-00-01, Disassembly.
(l) If the P/N and SN of the forward engine mount platform listed in Table 2 of this AD is installed on the engine:
(1) Remove the forward engine mount platform at the next shop visit, or within 4,800 cycles after the effective date of this AD, whichever occurs first.
(2) Information for removal of the forward engine mount yoke can be found in the CF6-80C2 Engine Manual, 72-00-01, Disassembly.
(m) If the P/N and SN of the forward engine mount yoke listed in Table 3 of this AD is installed on the engine:
(1) Remove the forward engine mount yoke at the next shop visit, or within 4,800 cycles after the effective date of this AD, whichever occurs first.
(2) Information for removal of the forward engine mount yoke can be found in the CF6-80C2 Engine Manual, 72-00-01, Disassembly.
(n) Replace the affected forward engine mount platform and or the affected forward engine mount yoke with a non-weld-repaired cast titanium forward engine mount platform and or the forward engine mount yoke or a forged titanium forward engine mount platform or a forged titanium forward engine mount yoke.
(o) Information for installing the forward engine mount platform and forward engine mount yoke can be found in the CF6-80C2 Engine Manual, 72-00-01, Assembly.
(p) Location of the forward engine mount platform and forward engine mount yoke and SN are illustrated in the following Figure 1.
(q) After the effective date of this AD, do not install a weld-repaired, cast forward engine mount platform or a weld-repaired, cast forward engine mount yoke in any engine.
