Airworthiness Directive · Amendment 39-11597 · General Electric Company CF6-80C2 Series Turbofan Engines
General Electric Company CF6-80C2 Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2013-08-20. Comply with the one in force.
General Electric Company (GE) CF6-80C2 A1/ A2/ A3/ A5/ A8/ A5F/ B1/ B2/ B4/ B6/ B1F/ B2F/ B4F/ B6F/ B7F/ D1F turbofan engines, installed on but not limited to Airbus Industrie A300-600/ 600R series and A310-200Adv/ 300 series, and Boeing 747-200/ 300/ 400 series and 767-200ER/ 300/ 300ER/ 400ER and McDonnell Douglas MD-11 series airplanes.
Note 1: This airworthiness directive (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.
This amendment adopts a new airworthiness directive (AD), applicable to General Electric Company (GE) CF6-80C2 series turbofan engines, that requires replacement of the fuel tube connecting the flowmeter to the Integrated Drive Generator (IDG) and the fuel tube(s) connecting the Main Engine Control (MEC) or Hydromechanical (HMU) to the flowmeter with improved fuel tubes. This amendment is prompted by reports of fuel leaking in the core cowl cavity under high pressure that can be ignited by the hot engine case temperatures. The actions specified by this AD are intended to prevent high-pressure fuel leaks caused by improper seating of fuel tube flanges, which could result in an engine fire and damage to the airplane.
To prevent improper fuel tube flange seating, resulting in high pressure fuel leaks, which could result in an engine fire and damage to the airplane, accomplish the following:
(a) At the next time the fuel tubes are disconnected at either end for on-wing maintenance, or the next shop visit after the effective date of this AD, whichever occurs first, replace the old configuration fuel tubes with the improved tubes. For on-wing maintenance, replace only the fuel tube(s) that have been disconnected. Perform the actions as follows:
(1) Replace the fuel flowmeter to Integrated Drive Generator (IDG) cooler fuel tube, part number (P/N) 1321M42G01, with a serviceable part in accordance with paragraph 2 of GE Alert Service Bulletin (ASB) No. 73-A224, Revision 2, July 9, 1997, and perform a leak check after accomplishing the replacement.
(2) For engines with Power Management Controls, replace the Main Engine Control (MEC) to fuel flowmeter fuel tube, P/N 1334M88G01, and bolts, P/N MS9557-12, with serviceable parts, in accordance with paragraph 3A of GE ASB 73-A0231, Revision 1, dated May 3, 1999 and perform a leak check after accomplishing the replacement.
(3) For engines with Full Authority Digital Electronic Controls replace the Hydromechanical Unit (HMU) to fuel flowmeter fuel tubes, P/Ns 1383M12G01 and 1374M30G01 with serviceable parts, in accordance with paragraph 3B of GE ASB 73-A0231, Revision 1, dated May 3, 1999 and perform a leak check after accomplishing the replacement.
Note 2: Information on performing the leak check can be found in the Aircraft Maintenance Manual, 71-00-00.
(b) For the purpose of this AD, a shop visit is defined as any time an engine is removed from service and returned to the shop for any maintenance.
(c) For the purpose of this AD, a serviceable part is defined as any part other than tube, P/N 1321M42G01, for the fuel flowmeter to IDG cooler; tube; P/N 1334M88G01, and bolt, P/N MS9557-12, for the MEC to fuel flowmeter tube; and tubes, P/Ns 1383M12G01 and 1374M30G01, for the HMU to fuel flowmeter fuel tubes.
