GE PROPRIETARY INFORMATION

The information contained in this publication is GE proprietary 

information and is disclosed in confidence. It is the property of GE 

and shall not be used, disclosed to others or reproduced without the 

express written consent of GE, including, but without limitation, it 

is not to be used in the creation, manufacture, development, or 

derivation of any repairs, modifications, spare parts, designs, or 

configuration changes or to obtain FAA or any other government or 

regulatory approval to do so. If consent is given for reproduction in 

whole or in part, this notice and the notice set forth on this media 

shall appear in any such reproduction in whole or in part. This 

technical data is considered ITAR and/or EAR controlled pursuant to 

22 CFR Part 120-130 and 15 CFR Parts 730-774 respectively. Transfer 

of this data by any means to a Non-U.S. Person, whether in the United 

States or abroad, without the proper U.S. Government authorization 

(e.g., License, exemption, NLR, etc.), is strictly prohibited.

All technical documentation and information contained herein, with 

respect to assembly and disassembly, cleaning, inspection methods and 

limits, repair methods and limits, operational limits, life limits 

and the like, have been developed and approved for use with engines 

and parts that have been manufactured and/or approved by GE and that 

have been maintained in accordance with GE technical documentation 

and recommendations. GE has no contractual or legal obligation for, 

nor knowledge of, non-GE-approved parts and repairs. Accordingly, 

this documentation is not intended to apply to non-GE-approved parts 

and repairs.

Copyright (2001) General Electric Company, U.S.A.

TRANSMITTAL INFORMATION

ENGINE Service Bulletin 73-0231 Revision 2

GE PROPRIETARY INFORMATION

The information contained in this document is GE proprietary 

information and is disclosed in confidence. It is the property of GE 

and shall not be used, disclosed to others or reproduced without the 

express written consent of GE, including, but without limitation, it 

is not to be used in the creation, manufacture, development, or 

derivation of any repairs, modifications, spare parts, design, or 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

1 of 10
configuration changes or to obtain FAA or any other government or 

regulatory approval to do so. If consent is given for reproduction 

in whole or in part, this notice and the notice set forth on each 

page of this document shall appear in any such reproduction in whole 

or in part. The information contained in this document may also be 

controlled by U.S. export control laws. Unauthorized export or reexport is prohibited.

Copyright (2001) General Electric Company, U.S.A.

This section transmits Revision 2 to ENGINE S/B 73-0231, dated May 

24, 1995.

Revision 1 was dated May 03, 1999.

This revision is issued to add a CAUTION statement to paragraph 3. 

ACCOMPLISHMENT INSTRUCTIONS. Also, washers are deleted and shorter 

bolts incorporated to achieve commonality with adjacent fuel tube 

flange fastener hardware.

Engines that have previously complied with this Service Bulletin are 

not affected.

The FAA has approved the technical content of this Service Bulletin.

The revision bars in the left margin identify changes.

This service bulletin is reissued in its entirety.

GEAE Distribution Code: 843

1. PLANNING INFORMATION

A. Effectivity

* * * CF6-80C2A1/A2/A3/A5/A8/A5F/B1/B2/B4/B6/B1F/B2F/B4F/B6F/B7F/D1F

(1) Main engine control (MEC) to flowmeter fuel tube 1334M88G01 

on CF6-80C2A1/A2/A3/A5/A8/B1/B2/B4/B6 (PMC) engines, and 

forward hydromechanical unit (HMU) to flowmeter fuel tube 

1383M12G01 and aft HMU to flowmeter fuel tube 1374M30G01 on 

CF6-80C2A5F/B1F/B2F/B4F/B6F/B7F/D1F (FADEC) engines, or 

stocked as spares are affected.

(2) MEC to flowmeter fuel tube 1334M88G03 will be introduced in 

production on the CF6-80C2A1/A2/A3/A5/A8/B1/B2/B4/B6 engines 

listed below:

690-370 and higher (except -900 and -901), and 695-667 and 

higher.

(3) Forward HMU to flowmeter fuel tube 1383M12G02 and aft HMU to 

flowmeter fuel tube 1374M30G03 will be introduced in 

production on the CF6-80C2A5F/B1F/ B2F/B4F/B6F/B7F/D1F 

engines listed below:

703-193 and higher, 704-276, -278 thru -281, -283 and 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

2 of 10
higher, and 705-233 and higher.

(4) These serial numbers are the best available data.

B. Description

Fuel tubes with improved four-bolt swivel retaining tube 

flanges are identified. Instructions for replacement are 

provided.

C. Compliance

Category 3

GE recommends that you do at next shop visit of engine or when 

old tube is disconnected for on-wing maintenance.

This Service Bulletin is offered to improve the reliability or 

performance of your GE product, or to prevent the occurrence 

of the event or condition described in this Service Bulletin. 

If the operator elects not to participate in the bulletin, 

that decision will be taken into consideration by GE in 

evaluating future product performance issues that may arise in 

the operator's fleet.

D. Reason

(1) Objective:

REDUCE SIGNIFICANT EVENTS - IN-FLIGHT SHUTDOWNS/ABORTED 

TAKEOFFS

Make the fuel tubes more reliable.

(2) Condition:

A swivel flange (figure 1 and figure 2) on the old tube may 

hang up on the tube ferrule and cause a significant fuel 

leak. Since the original of this Service Bulletin issued, 

several old tubes have leaked after maintenance and caused 

aborted takeoffs and in-flight shutdowns.

(3) Cause:

The geometry of the old tubes does not prevent hang ups of 

swivel flanges on tube ferrules.

(4) Improvement:

 The new flanges are chamfered and self-centering to avoid 

hang ups on the ferrule. Also, washers are deleted and 

shorter bolts incorporated to achieve commonality with 

adjacent fuel tube flange fastener hardware.

 Substantiation:

A graphical computer model and calculations verify that the 

interferences are eliminated.

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

3 of 10
A similar flange has been used on similar applications.

E. Approval

 Paragraph 3., ACCOMPLISHMENT INSTRUCTIONS, of this Alert 

Service Bulletin is approved by the Manager of the Engine 

Certification Office, ANE-140, by letter dated July 31, 2001, 

as an alternate method of compliance to paragraph (a)(2) and 

(a)(3) of Airworthiness Directive 2000-04-14.

F. Manpower

After you get access to the accessory gearbox assembly, you 

will need approximately 0.5 man-hours for each engine.

G. Weight and Balance

Weight and balance are not changed.

H. References

CF6-80C2 Engine Manual, GEK 92451

CF6-80C2A (PMC) Series Illustrated Parts Catalog (IPC), GEK 

92452-1

CF6-80C2A (FADEC) Series Illustrated Parts Catalog (IPC), GEK 

92452-5

CF6-80C2B (PMC) Series Illustrated Parts Catalog (IPC), GEK 

92452-2

CF6-80C2D (FADEC) Illustrated Parts Catalog (IPC), GEK 92452-3

CF6-80C2B (FADEC) Series Illustrated Parts Catalog (IPC), GEK 

92452-4

NOTE: The reference documents listed below are for the engine manufacturer's 

internal use only:

 CID: 346721, 346819, 346854, 349076

I. Publications Affected

CF6-80C2A (PMC) Series Illustrated Parts Catalog (IPC), GEK 

92452-1 

CF6-80C2A (FADEC) Series Illustrated Parts Catalog (IPC), GEK 

92452-5

CF6-80C2B (PMC) Series Illustrated Parts Catalog (IPC), GEK 

92452-2 

CF6-80C2D (FADEC) Illustrated Parts Catalog (IPC), GEK 92452-3

CF6-80C2B (FADEC) Series Illustrated Parts Catalog (IPC), GEK 

92452-4

J. Interchangeability

Replace the old tubes with the new tubes to reduce the 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

4 of 10
possibility of fuel leaks.

On CF6-80C2A1/A2/A3/A5/A8/B1/B2/B4/B6 engines, do not mix old 

and new parts. Use the new bolt with the new fuel tube at the 

MEC.

On CF6-80C2A5F/B1F/B2F/B4F/B6F/B7F/D1F engines, the old and 

new tubes are interchangeable.

K. Disposition of Parts

Replace old parts.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Parts necessary to do this Alert Service Bulletin:

Part 

Number 

Qty/Eng Part Name Unit 

Price 

($) 

Pkg 

Qty 

Lead 

time 

Days

For CF6-80C2A1/ A2/A3/A5/A8/ B1/B2/B4/B6 (PMC) engines: 

J221P217 (1) Packing, Preformed 2.05 (25) 30 

J219P05 (1) Gasket - Seal 19.00 (10) 30 

1334M88G03 (1) Tube, Fuel-MEC to 

Flowmeter 

991.00 (1) 30 

 MS9557-10 (8) Bolt * -- -- 

For CF6-80C2B1F/B2F/B4F/B6F/B7F/D1F/A5F (FADEC) engines: 

J221P217 (1) Packing, Preformed 2.05 (25) 30 

J219P05 (2) Gasket - Seal 19.00 (10) 30 

1383M12G02 (1) Tube, Fuel - HMU to 

Flowmeter, Fwd 

655.00 (1) 30 

1374M30G03 (1) Tube, Fuel - HMU to 

Flowmeter, Aft 

1648.00 (1) 30 

* GE Engine Services Distribution, L.L.C., does not sell these 

parts.

NOTE: Prices can change.

(2) Future spare parts:

Refer to paragraph 2.A.(1).

(3) Consumables:

None.

B. Industry Support Information

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

5 of 10
(1) Material

GE Engine Services Distribution, L.L.C., will give you an 

up-front 50 percent parts discount, if this Alert Service 

Bulletin is done per the recommended technical compliance. 

Refer to paragraph 2.A.(1). To get the allowance, send a 

charge Purchase Order before December 31, 2002 (the Purchase 

Order must include the list of parts and the number of this 

Alert Service Bulletin) to:

ATTN: Customer Account MangerGE Engine Services 

Distribution, L.L.C.One Neumann WayRoom 115Cincinnati, OH 

45215-1988 USA

C. Configuration Chart

Configuration Chart

New Part 

Number 

Qty/Eng Part Name Old Part 

Number/IPC 

Location 

Qty/Eng OPCode

(PRODUCTION OR FIELD) 

9255M28G01 

thru G09 

(1) Assembly, Accessory 

DriveCF6-

80C2A1/A2/A3/ 

A5/A8/B1/B2/ B4/B6 

9255M28G01 

thru G09 

(1) RM

.1334M88G03 (1) Tube, Fuel - MEC to 

Flowmeter 

.1334M88G01 

73-00-00-05-

060 

(1) RE

 .MS9557-10 (8) Bolt MS9557-12 

73-00-00-05-

170 

(8) RE

 -----------

---- 

(-) Washer .AN960C41673-

00-00-05-175 

(8) DE

 9255M79G01 

thru G03 

(1) Assembly, Accessory 

DriveCF6-

80C2B1F/B2F/ 

B4F/B6F/B7F/D1F/A5F

9255M79G01 

thru G03 

(1) RM

 .1383M12G02 (1) Tube, Fuel - MEC to 

Flowmeter, Forward 

.1383M12G01 

73-00-00-07-

005 

(1) RE

 .1374M30G03 (1) Tube, Fuel - MEC to 

Flowmeter, Aft 

.1374M30G01 

73-00-00-07-

081 

(1) RE

 Change Codes

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

6 of 10
 2 = Two-way interchangeable.

 3 = Not interchangeable.

 5 = Qualified interchangeability - parts deleted.

 Spare Parts Support Code

 A = Old parts will no longer be supplied.

 E = Old parts will be supplied, and can be used at other engine 

locations.

 Operation Codes

 RM = Remains

 RE = Replace

 DE = Delete

 D. Tooling - Price and Availability

 None.

 3. ACCOMPLISHMENT INSTRUCTIONS

WARNING: DO NOT USE AVIATION TURBINE FUEL (JET FUEL) NEAR FLAMES OR HEAT, BECAUSE 

THIS FUEL IS VERY FLAMMABLE. DO NOT LET THE FUEL STAY ON YOUR BODY OR 

CLOTHES. THIS FUEL IS DANGEROUS TO YOUR SKIN AND EYES. DO NOT BREATHE THE 

FUMES RELEASED FROM THIS FUEL. MAKE SURE YOU HAVE A GOOD FLOW OF AIR. THESE 

FUMES ARE DANGEROUS TO YOUR LUNGS, CAN GIVE YOU A HEADACHE, AND CAN MAKE 

YOU SICK.

CAUTION: WHEN INSTALLING OR REPLACING THE FUEL FLOWMETER TUBES OR REPLACING THE SEAL 

GASKET (J219P05) THE FOLLOWING ASSEMBLY PROCEDURE SHOULD BE FOLLOWED TO 

AVOID POTENTIAL HIGH PRESSURE FUEL LEAKS:

 A. For CF6-80C2A1/A2/A3/A5/A8/B1/B2/B4/B6 engines, replace the 

MEC to flowmeter fuel tube 1334M88G01 (figure 1).

 (1) Use a suitable container to catch fuel. Remove four bolts 

and washers at each end of the MEC to flowmeter fuel 

tube.

NOTE: Brackets and/or spray shields of various configurations may be retained 

by the bolts for the MEC to flowmeter fuel tube. During removal, note 

the orientations of these parts and reinstall them in the same 

orientations.

 (2) Remove MEC to flowmeter fuel tube 1334M88G01.

 (3) Clean flange surfaces to make sure no debris is present. 

 (4) Inspect seal gasket prior to installation to make sure no 

nicks or tears exist on the O-ring seal.

 (5) Lightly lubricate seals with engine oil (02 C-019).

 (6) Replace one preformed packing J221P217 and one seal 

gasket (J219P05) and install MEC to flowmeter fuel tube 

1334M88G03

 (7) Install four bolts MS9557-10 to a finger tight condition, 

without washers, to attach the MEC to flowmeter fuel tube 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

7 of 10
to the fuel flowmeter.

 (8) Install four bolts MS9557-10 to a finger tight condition, 

without washers, to attach the MEC to flowmeter fuel tube 

to the MEC.

 (9) Center four bolt swivel flange around tube end ferrule.

 (10) Torque eight bolts to 55-70 lb in. (6.2-7.9 N.m) in a 

diagonal pattern to ensure proper seating of the gasket. 

Go to step C.

 B. On CF6-80C2A5F/B1F/B2F/B4F/B6F/B7F/D1F engines, replace the 

forward HMU to flowmeter fuel tube 1383M12G01 and the aft 

HMU to flowmeter fuel tube 1374M30G01 (figure 2).

NOTE: During removal, note the orientations of nuts, bolts, washers, brackets 

and spray shields and reinstall them in the same orientations during 

assembly.

 (1) Use a suitable container to catch fuel. Remove four nuts, 

twelve bolts, and four washers that secure the two tubes. 

Remove the tubes.

 (2) Remove forward HMU to flowmeter fuel tube 1383M12G01 and 

AFT HMU to flowmeter tube 1374M30G01.

 (3) Clean flanges to ensure no debris is present.

 (4) Inspect seal gasket prior to installation to make sure no 

nicks or tears exist on the O-ring seal.

 (5) Lightly lubricate seals with engine oil (C02-019 ).

 (6) Replace one preformed packing J221P217 and two seal 

gaskets J219P05, and install the new tubes.

 (7) Install all fasteners to a finger tight condition.

 (8) Center four bolt swivel flanges around tube end ferrule.

 (9) Torque flange bolts to 55-70 lb in (6.2-7.9 N.m) in a 

diagonal pattern to ensure proper seating of the gasket.

 C. Do an idle leak check. Refer to the Aircraft Maintenance 

Manual, 71-00-00.

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

8 of 10
 MEC to Flowmeter Fuel Tube on PMC Engines 

Figure 1 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

9 of 10
 HMU to Flowmeter Fuel Tubes on FADEC Engines 

Figure 2 

CF6-80C2 Alert Service Bulletin No 73- A0231 R02

Revised: 

08/01/2001 Issued: 05/24/1995

SB 73-A0231 R02 ENGINE FUEL AND CONTROL - Fuel Tubes (72-00-05) - Swivel Retaining 

Tube Flanges

Date Printed:

Jun 25, 2012

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

10 of 10