Airworthiness Directive · Amendment 39-11756 · Boeing Model 747 and 767 Series Airplanes Powered by General Electric Model CF6-80C2 Series Engines
Boeing Model 747 and 767 Series Airplanes Powered by General Electric Model CF6-80C2 Series Engines
Model 747 and 767 series airplanes, powered by General Electric Model CF6-80C2 series engines, certificated in any category.
Note 1: This AD applies to each airplane 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 airplanes 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 (g)(1) 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 supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747 and 767 series airplanes, that currently requires revising the FAA-approved Airplane Flight Manual (AFM) to prohibit the use of certain fuels; and either replacing an existing placard with a new placard, or replacing all dribble flow fuel nozzles (DFFN) with standard fuel nozzles, which terminates the requirements for the new placard and AFM revision. This amendment continues these requirements and adds identical requirements applicable to airplanes on which standard fuel nozzles are not installed. This amendment is prompted by a report of an engine flameout due to use of JP-4 or Jet B fuel during certification testing on an engine with DFFN's installed. The actions specified by this AD are intended to prevent such engine flameouts and consequent engine shutdown.
To prevent engine flameouts due to the use of JP-4 or Jet B fuel on certain engines with dribble flow fuel nozzles (DFFN) installed, and consequent engine shutdown, accomplish the following:
(a) If a DFFN having General Electric part number 9331M72P33, 9331M72P34, or 9331M72P41 is installed on any airplane in a specific operator's fleet, accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD; in accordance with either Boeing Alert Service Bulletin 747-11A2052, dated September 11, 1997, or Revision 1, dated August 5, 1999 (for Model 747 series airplanes); or Boeing Alert Service Bulletin 767-11A0031, dated September 11, 1997, or Revision 1, dated August 12, 1999 (for Model 767 series airplanes); as applicable.
(1) Within 14 days after May 1, 1998 (the effective date of AD 98-08-23), all airplanes in a specific operator's fleet must revise Section 1 of the Limitations Section of the FAA-approved AFM to include the following procedures. This may be accomplished by inserting a copy of this AD into the AFM.
(i) Revise paragraph 1 of the Engine Fuel System section to read as follows: “The fuel designation is General Electric (GE) Specification D50TF2, as revised. Fuel conforming to commercial jet fuel specification ASTM-D-1655, Jet A, and Jet A-1 are authorized for unlimited use in this engine. Fuels conforming to MIL-T-5624 grade JP-5 and MIL-T-83113 grade JP-8 are acceptable alternatives. The engine will operate satisfactorily with any of the foregoing fuels or any mixture thereof.” And,
(ii) Add the following sentence to paragraph 2 of the Engine Fuel System section: “The use of Jet B and JP-4 fuel is prohibited.”
(2) Within 30 days after May 1, 1998, all airplanes in a specific operator's fleet must accomplish the requirements of paragraph (a)(2)(i) or (a)(2)(ii) of this AD, as applicable.
(i) Remove the existing placard on the door of the fueling control panel and replace it with a new placard that restricts the use of JP-4 and Jet B fuels (wide cut fuels), in accordance with the applicable alert service bulletin. Or
(ii) Remove the DFFN's, and replace them with standard fuel nozzles, in accordance with the applicable alert service bulletin. When an operator's entire fleet has had all DFFN's replaced with standard fuel nozzles, the AFM revision required by paragraphs (a)(1)(i) and (a)(1)(ii) of this AD may be removed from the AFM, and the placard required by paragraph (a)(2)(i) of this AD may be removed from each airplane.
(b) As of May 1, 1998, no person shall install any DFFN having General Electric part number 9331M72P33, 9331M72P34, or 9331M72P41 on any airplane unless the requirements specified by paragraphs (a)(1)(i), (a)(1)(ii), and (a)(2)(i) of this AD have been accomplished for the operator's entire fleet.
(c) If a fuel nozzle NOT having one of the General Electric part numbers listed in Table 1 of this AD is installed on any airplane in a specific operator's fleet: Within 14 days after the effective date of this AD, revise Section 1 of the Limitations Section of the FAA-approved AFM for each airplane in the operator's fleet to include the following procedures. This may be accomplished by inserting a copy of this AD into the AFM.
| Part Number |
|---|
| 9331M72P14 |
| 9331M72P20 |
| 9331M72P21 |
| 9331M72P22 |
| 9331M72P23 |
| 9331M72P24 |
| 9331M72P27 |
| 9331M72P28 |
| 9331M72P39 |
| 9331M72P40 |
| 1968M49P03 |
| 1968M49P04 |
| 1968M49P05 |
| 1968M49P06 |
(1) Revise paragraph 1 of the Engine Fuel System section to read as follows: “The fuel designation is General Electric (GE) Specification D50TF2, as revised. Fuel conforming to commercial jet fuel specification ASTM-D-1655, Jet A, and Jet A-1 are authorized for unlimited use in this engine. Fuels conforming to MIL-T-5624 grade JP-5 and MIL-T-83113 grade JP-8 are acceptable alternatives. The engine will operate satisfactorily with any of the foregoing fuels or any mixture thereof.” And,
(2) Add the following sentence to paragraph 2 of the Engine Fuel System section: “The use of Jet B and JP-4 fuel is prohibited.”
(d) If a fuel nozzle NOT having one of the General Electric part numbers listed in Table 1 of this AD is installed on any airplane in a specific operator's fleet: Within 30 days after the effective date of this AD, accomplish the requirements of paragraph (d)(1) or (d)(2) of this AD on each airplane in the operator's fleet, in accordance with either Boeing Alert Service Bulletin 747-11A2052, Revision 1, dated August 5, 1999 (for Model 747 series airplanes); or Boeing Alert Service Bulletin 767-11A0031, Revision 1, dated August 12, 1999 (for Model 767 series airplanes); as applicable.
(1) Remove the existing placard on the door of the fueling control panel and replace it with a new placard that restricts the use of JP-4 and Jet B fuels (wide cut fuels), in accordance with the applicable alert service bulletin. Or
(2) Remove any fuel nozzle having a part number NOT listed in Table 1 of this AD, and replace it with a fuel nozzle having a part number listed in Table 1 of this AD, in accordance with the applicable alert service bulletin. When an operator's entire fleet has only fuel nozzles having a part number listed in Table 1 of this AD installed, the AFM revision required by paragraph (c) of this AD may be removed from the AFM, and the placard required by paragraph (d)(1) of this AD may be removed from each airplane.
(e) Except as provided by paragraphs (b) and (f) of this AD, if all fuel nozzles installed on any airplane in a specific operator's fleet have one of the General Electric part numbers listed in Table 1 of this AD, no further action is required by this AD.
(f) As of the effective date of this AD, no person shall install any fuel nozzle NOT having one of the General Electric part numbers listed in Table 1 of this AD on any airplane unless the requirements specified by paragraphs (c)(1), (c)(2), and (d)(1) of this AD have been accomplished for the operator's entire fleet.
(g)(1) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO.
(2) Alternative methods of compliance, approved previously in accordance with AD 98-08-23, amendment 39-10472, are approved as alternative methods of compliance with this AD.
Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO.
