CF6-80C2 Service Bulletin No 73-0326 R04

Revised: 12/23/2009 Issued: 03/05/2003

SB 73-0326 R04 ENGINE - Fuel and Control (72-00-02) - Fuel Manifold Inspection and Clamp 

Replacement

CF6-80C2 SERVICE BULLETIN - 73-0326 R04 Revised: 

12/23/2009

SB 73-0326 R04 ENGINE - FUEL AND CONTROL (72-00-02) -

FUEL MANIFOLD INSPECTION AND CLAMP 

REPLACEMENT

Issued: 

03/05/2003

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.

GEAE authorizes the Federal Aviation Administration to incorporate this document by reference 

in an Airworthiness Directive.

Copyright (2009) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION

REVISION 4 TO SERVICE BULLETIN 73-0326

Revision 4 is issued to update paragraph 1., PLANNING INFORMATION, to correct the 

airworthiness directive (AD) paragraph reference for the alternative method of compliance 

(AMOC) in paragraph 1.F., Approval, to correct paragraph 2., MATERIAL INFORMATION, 

to correct the Service Bulletin number for installing of the non PTFE tape, and to add 

instructions to remove non PTFE tape from the manifold in paragraph 

3., ACCOMPLISHMENT INSTRUCTIONS.

Revision 3 was issued April 24, 2009. Revision 2 was issued August 30, 2007. Revision 1 was 

issued August 22, 2007. The original was issued March 05, 2003. Revision bars in the left 

margin identify changes.

1. PLANNING INFORMATION

A. Effectivity

* * * CF6-80C2A1, A2, A3, A5, A8, A5F, B1, B2, B4, B6, B1F, B2F, B4F, B5F, B6F, B6FA, 

B7F, B8F, D1F, L1F, K1F

(1) The parts in Table 1 are affected by this Service Bulletin.

Table 1

Service 

Bulletin

Part 

Number

Description Fuel Manifold 

Position

Drained/ 

Drainless

Taped/ No 

Tape

-- 1303M31G10 Fuel Manifold Left Side Drained No Tape

-- 1303M32G10 Fuel Manifold Right Side Drained No Tape

73-0253 1303M31G12 Fuel Manifold Left Side Drainless No Tape

73-0253 1303M32G12 Fuel Manifold Right Side Drainless No Tape

73-0365 2420M70G01 Fuel Manifold Left Side Drainless PTFE 

Taped

73-0365 2420M71G01 Fuel Manifold Right Side Drainless PTFE 

Taped

-- J1220G10 Cushioned Loop 

Clamp

-- -- --

B. Description

This Service Bulletin identifies a repetitive inspection of the fuel manifold and the 

replacement of the cushioned loop clamp. This Service Bulletin applies for all fuel 

manifold configurations in CF6-80C2 engines, except for drained manifolds with PTFE 

tape installed. The inspection is necessary to detect wall thinning in the fuel manifold 

that can result from relative motion between the cushioned loop clamp and the fuel 
manifold.

C. Compliance

Category 2

GE recommends that you do this Service Bulletin as soon as possible without effect 

on revenue service but before the inspection intervals for each manifold configuration 

as follows:

Post-CF6-80C2 S/B 73-0253 (non PTFE taped drainless fuel manifolds): AD 2009-05-

02 specifies initial and repeat inspection requirements. Repeat inspection requirements 

are also listed in CF6-80C2 engine manual (EM), 05-21-73, LIFE LIMITS - FUEL 

MANIFOLD - MANDATORY INSPECTION AND MAINTENANCE INTERVALS. 

Refer to paragraph 3.A., Inspection of post-CF6-80C2 S/B 73-0253 pre-CF6-80C2 S/B 

73-0365 (Non PTFE Taped Drainless Fuel Manifolds) P/N 1303M31G12 and P/N 

1303M32G12.

Pre-CF6-80C2 S/B 73-0253 (non PTFE taped drained fuel manifold):

(1) Engines with used clamps installed at the last inspection or overhaul, inspect the 

manifold and replace the clamps within 4,500 hours since the last inspection or 

overhaul using paragraph 3.B., ACCOMPLISHMENT INSTRUCTIONS.

(2) Engines with new clamps installed at the last inspection or overhaul, inspect the 

manifold and replace the clamps within 7,500 hours since the last inspection or 

overhaul using paragraph 3.B., ACCOMPLISHMENT INSTRUCTIONS.

(3) After the initial inspection and clamp replacement, reinspect the manifold and 

replace the clamps at an interval not greater than 7,500 hours since the last 

inspection using paragraph 3.B., ACCOMPLISHMENT INSTRUCTIONS. 

Post-CF6-80C2 S/B 73-0253 post-CF6-80C2 S/B 73-0365 (PTFE taped drainless fuel 

manifolds): For inspection requirements, refer to the CF6-80C2 EM, 05-21-73, LIFE 

LIMITS - FUEL MANIFOLD - MANDATORY INSPECTION AND 

MAINTENANCE INTERVALS. Refer to the paragraph 3.C., Inspection of post-CF6-

80C2 S/B 73-0253 post-CF6-80C2 S/B 73-0365 (Drainless PTFE Taped Fuel 

Manifolds) P/N 2420M70G01 and P/N 2420M71G01.

NOTE: This Service Bulletin can be accomplished in shop or on wing.

This Service Bulletin is offered to improve the reliability or performance of your GE 

product, or to help 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. Concurrent Requirements
GE recommends this Service Bulletin be accomplished concurrently with CF6-80C2 

S/B 73-0365.

E. Reason

(1) Objective:

To reduce significant events.

(2) Condition:

The tube wall thinning on the fuel manifolds, if undetected, can result in a fuel 

leak. One event resulted in an under-cowl fire.

(3) Cause:

The cushion material on the cushioned loop clamps erodes and becomes 

contaminated with foreign abrasive material. The abrasive material in the 

cushioned loop clamp wears against the fuel manifold and thins the tube wall 

beyond serviceable limits.

(4) Inspection:

This inspection will allow detection of worn fuel manifolds. The cushioned loop 

clamps are replaced with new parts to ensure that contaminated cushioned loop 

clamps are not installed on the engine.

(5) Substantiation:

Substantiation is based upon design analysis and field inspection data analysis.

F. Approval

This Service Bulletin has been reviewed by the appropriate governmental authority 

and the repair(s) and modification(s) herein comply with the applicable Aviation 

Regulations and are APPROVED for installation in the model(s) listed in this Service 

Bulletin.

Service Bulletin 73-0326, Revision 3, ACCOMPLISHMENT INSTRUCTIONS

paragraph 3.D.(2), is approved by the Manager, Engine Certification Office, ANE140, by letter dated April 21, 2009 as an Alternative Method of Compliance to AD 

2009-05-02, paragraphs 2.(h)(1) through 2.(h)(3).

Service Bulletin 73-0326, Revision 4, ACCOMPLISHMENT INSTRUCTIONS

paragraphs 3.D.(3), is approved by the Manager, Engine Certification Office, ANE140, by letter dated December 22, 2009 as an AMOC to AD 2009-05-02, 

paragraph (h)(5).
G. Manpower

After you get access to the fuel manifolds and cushioned loop clamps, you will need 

approximately 2 man-hours to replace cushioned loop clamps and inspect the fuel 

manifold, for each engine.

If fuel manifold removal and installation is necessary, you will need approximately 10 

man-hours.

H. Weight and Balance

Weight and balance are not changed.

I. References (Use the latest version of these documents)

Airworthiness Directive (AD) 2009-05-02 Airbus Industrie A300-600 Aircraft 

Maintenance Manual (AMM) Airbus Industrie A300-600 FADEC Aircraft 

Maintenance Manual (AMM)

Airbus Industrie A310-200/-300 Aircraft Maintenance Manual (AMM) Boeing 747-

200/-300 Aircraft Maintenance Manual (AMM) Boeing 747-400 Aircraft Maintenance 

Manual (AMM) Boeing 767-200/-300 Aircraft Maintenance Manual (AMM) GEK 

9250, Commercial Standard Practices Manual (SPM) GEK 92451, CF6-80C2 Engine 

Shop Manual (EM) McDonnell Douglas MD11 Aircraft Maintenance Manual (AMM) 

GEK 112721, CF6-80C2K1F Engine Manual (EM) GEK 112213, CF6-80C2L1F 

Engine Manual (EM)

CF6-80C2 S/B 73-0253, FUEL AND CONTROL - Core Module (72-00-02) - Delete 

Fuel Drain System for the Fuel Manifold

CF6-80C2 S/B 73-0365, FUEL AND CONTROL - Core Engine Module (72-00-02) -

Fuel Manifold PTFE Tape Installation

J. Publications Affected

None.

K. Interchangeability

Not applicable.

L. Software Accomplishment Summary

Not applicable.

2. MATERIAL INFORMATION

A. Material - Price and Availability
(1) Parts necessary to do this Service Bulletin:

Part Number Qty/ Eng Part Name Unit/ ($) Price Pkg Qty Lead Time Days

RPK426G01* (1) Kit Quote (1) 10

*The Kit contains 24 cushioned loop clamps P/N J1220G10.

NOTE: Prices are provided solely for planning purposes, and are subject to change.

(2) Other Spare Parts: 

If unserviceable chafing is found on the fuel manifolds, the following parts may 

be required:

Part Number

Qty/ 

Eng Part Name

Unit/ ($) 

Price

Pkg 

Qty

Lead Time 

Days

1303M31G12 (1) Manifold, Fuel Left 

Side

** (**) **

1303M32G12 (1) Manifold, Fuel Right 

Side

** (**) **

1303M31G10* (1) Manifold, Fuel Left 

Side

** (**) **

1303M32G10* (1) Manifold, Fuel Right 

Side

** (**) **

2420M70G01 (1) Manifold, Fuel Left 

Side

12,060.00 (1) 7

2420M71G01 (1) Manifold, Fuel Right 

Side

10,250.00 (1) 7

*Parts are field use and are to be used on pre-CF6-80C2 S/B 73-0253 engines only.

**See IPC for latest configuration. GE recommends you do application of PTFE tape 

per CF6-80C2 S/B 73-0365.

NOTE: Prices are provided solely for planning purposes, and are subject to change.

NOTE: If necessary, replace the left side fuel manifold P/N 1303M31G10 with left side 

fuel manifold P/N 1303M31G12 or P/N 2420M70G01.

NOTE: If necessary, replace the right side fuel manifold P/N 1303M32G10 with right 

side fuel manifold P/N 1303M32G12 or P/N 2420M71G01.

(3) Consumables:

Code Number Description

C04-035 Solvent, General (Isopropyl Alcohol)

C10-230 Tape, PTFE Film, Silicone Adhesive (PTFE tape)
B. Industry Support Information

GEAE may provide financial support. Contact your Customer Support Manager 

(CSM) for more information. Fuel manifolds found with unserviceable chafing may 

be sent to Elano Corporation for Repair. Send the fuel manifold along with a Charge 

Purchase Order (specifying the number of this Service Bulletin) to:

Unison Industries, LLC Attn: Customer Support 2070 Heller Drive Alpha, OH 45301-

0217 U.S.A.

Phone:(937) 490-7055

Fax:(937) 490-7081

C. Configuration Chart

Not applicable.

D. Parts Disposition 

If the fuel manifold is found unserviceable after inspection it can be replaced or sent 

for repair to a certified repair station. Discard old cushioned loop clamps.

E. Tooling - Price and Availability

Special tools are not required to do this Service Bulletin.

3. ACCOMPLISHMENT INSTRUCTIONS

A. Inspection of post-CF6-80C2 S/B 73-0253 pre-CF6-80C2 S/B 73-0365 (Non PTFE 

Taped Drainless Fuel Manifolds) P/N 1303M31G12 and P/N 1303M32G12

NOTE:Refer to paragraph 1.D., Concurrent Requirements, for additional 

recommendations for these fuel manifold part numbers.

(1) Remove the cushioned loop clamp bolt (1, Figure 1)at each of the friction damper 

bracket (2) locations (24 places).

(2) Remove and discard the cushioned loop clamp (3) from the 24 places on the fuel 

manifolds (4).

WARNING:ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL 

PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA.

(3) If tape is present on the fuel manifold (4), remove it. Isopropyl alcohol (C04-035) 

can be used to help in tape removal. Let dry. If tape or contamination remains after 

cleaning, clean once more.

(4) Inspect the manifolds at each clamp location. Refer to paragraph 3.D., General 

Inspection Procedure.
(5) Install cushioned loop clamp bolt (1) and new cushioned loop clamp (3) in all 

friction damper bracket (2) locations (24 places). Tighten the bolts to 33-37 lb in. 

(3.7-4.2 N·m).

B. Inspection of pre-CF6-80C2 S/B 73-0253 pre-CF6-80C2 S/B 73-0365 (Non PTFE 

Taped Drained Fuel Manifold) P/N 1303M31G10 and P/N 1303M32G10 

NOTE:Refer to paragraph 1.D., Concurrent Requirements, for additional 

recommendations for these fuel manifold part numbers.

(1) Remove the cushioned loop clamp bolt (1, Figure 2)at each of the friction damper 

bracket (2) locations (24 places). It is not necessary to remove the cushioned loop 

clamp bolt (5) that secures the cushioned loop clamp (7) on the fuel manifold (4) 

and the cushioned loop clamp (8) on the fuel drain manifold (9) locations (28 

places).

(2) Remove and discard the cushioned loop clamp (3) from the 24 places on the fuel 

manifolds (4).

WARNING:ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL 

PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA.

(3) If tape is present on the fuel manifold (4), remove it. Isopropyl alcohol (C04-035) 

can be used to help in tape removal. Let dry. If tape or contamination remains after 

cleaning, clean once more.

(4) Inspect the manifolds at each clamp location. Refer to paragraph 3.D., General 

Inspection Procedure.

(5) Install cushioned loop clamp bolt (1) and new cushioned loop clamp (3) in all 

friction damper bracket (2) locations (24 places). Tighten the bolts to 33-37 lb in. 

(3.7-4.2 N·m).

C. Inspection of post-CF6-80C2 S/B 73-0253 post-CF6-80C2 S/B 73-0365 

(PTFE Taped Drainless Fuel Manifolds) P/N 2420M70G01 and P/N 2420M71G01

NOTE:This procedure may also be used for pre-CF6-80C2 S/B 73-0253 (drained) post-CF6-

80C2 S/B 73-0365 (PTFE taped) manifolds P/N 2420M72G01 and P/N 

2420M73G01, although on wing inspection for this configuration is not required.

(1) Remove the cushioned loop clamp bolt (1, Figure 1)at each of the friction damper 

bracket (2) locations (24 places).

(2) Remove the cushioned loop clamp (3) from the 24 places on the fuel manifolds 

(4).

(3) The table that follows provides inspection instructions for manifolds with PTFE 

tape under the clamp.
Condition Action

PTFE tape (C10-230) has no visual 

evidence of unbonded areas between the 

tape and the manifold no damage* 

detected by unmagnified visual inspection 

and no loose tape material.

Install a new cushioned loop clamp (3). 

Make sure tape extends beyond edge of the 

clamp. Tighten bolts to 33-37 lb in. (3.7-

4.2 N·m). 

PTFE tape (C10-230) has visual evidence 

of unbonded areas between the tape and 

the manifold, or has damage* detected by 

unmagnified visual inspection or loose 

tape material but has no parent metal 

exposed through the tape.

Remove tape. Apply new PTFE tape (C10-

230) per CF6-80C2 S/B 73-0365. Install 

new cushioned loop clamp (3). Make sure 

tape extends beyond edge of the clamp. 

Tighten bolts to 33-37 lb in. (3.7-4.2 N·m).

PTFE tape (C10-230) wear through to 

parent metal of the tube.

Remove tape and inspect per general 

inspection procedure 3.D. If the fuel 

manifold passes the inspection, apply the 

PTFE tape (C10-230) per CF6-80C2 S/B 

73-0365. Install new cushioned loop clamp. 

Tighten bolts to 33-37 lb in. (3.7-4.2 N·m).

*Damage condition is defined as wrinkles, tears or evidence of wear. It does not 

include compression or burnishing.

D. General Inspection Procedure (to be done as directed by paragraphs 3.A, 3.B, and 

3.C.)

WARNING: ISOPROPYL ALCOHOL IS TOXIC AND FLAMMABLE. USE PERSONAL 

PROTECTION EQUIPMENT. USE IN A WELL-VENTILATED AREA. 

NOTE: Isopropyl alcohol (C04-035) can be used to help in tape removal. Allow time to dry. 

If tape or contamination remains after cleaning, clean once again.

(1) Clean the fuel manifolds at the 24 clamp places. Refer to the SPM, 70-21-23, 

CLEANING METHOD 23 - HAND-WIPE DEGREASING, or equivalent 

method. 

(2) Do a visual inspection of the fuel manifolds (4, Figure 1)or (4, Figure 2)with a 

bright light at all the clamp places. Most chafing occurs on the inboard side of the 

fuel manifold near the cushioned loop clamp tabs. Pay specific attention to these 

areas (Figure 2,Detail D). If the fuel manifolds have any signs of wear (Figure 3), 

measure the tube as follows or with an equivalent method that can detect reduced 

wall thickness:

(a) Measure the outside diameter of the tube adjacent to the worn area. Record 

the reading.

(b) Measure the outside diameter of the tube in the worn area; find the smallest 

diameter. Record the reading. 
(c) Subtract the measurement of the worn tube recorded in step 3.D.(2)(b) from 

the undamaged tube measurement recorded in step 3.D.(2)(a).

(d) Permitted wear is less than or equal to 0.0035 inch (0.089 mm).

(3) A fuel manifold with wear that is more than 0.0035 inch (0.089 mm) but equal to or 

less than 0.010 inch (0.25 mm) can continue its operation up to 50 cycles before the 

fuel manifolds must be replaced. For fuel manifolds removal and installation, refer 

to the applicable AMM.

(4) A fuel manifold with wear that is more than 0.010 inch (0.25 mm) is 

unserviceable and must be replaced immediately. For fuel manifold removal and 

installation, refer to the applicable AMM.

E. Reporting Fuel Manifold Chafing Inspection Results

If chafing is found while performing the fuel manifold inspection, please send the 

following information for each engine to your CSM. The CSM will forward the results 

to the Product Support Engineering (PSE) hardware owner.

Date 

Inspected ESN

TSN Or 

TSSV

CSN Or 

CSSV

Chafing 

Location (Aft 

Looking 

Forward)

Event Result 

(Leak/Chafing -

Include Depth)

Post-S/B 73-

0253 (no drain 

system)

Pre-S/B 73-

0253 (with 

drain system)
Configuration of Fuel Manifold Post-CF6-80C2 S/B 73-0253 (Drainless Fuel Manifold)

Figure 1 (Sheet 1)
Configuration of Fuel Manifold Post-CF6-80C2 S/B 73-0253 (Drainless Fuel Manifold)

Figure 1 (Sheet 2)
Configuration of Fuel Manifold Post-CF6-80C2 S/B 73-0253 (Drainless Fuel Manifold)

Figure 2 (Sheet 1)
Configuration of Fuel Manifold Pre-CF6-80C2 S/B 73-0253 (Drained Fuel Manifold) 

Figure 2 (Sheet 2)
Location of Clamp wear on the Fuel Manifold

Figure 2 (Sheet 3)
Inspection of Fuel Manifold

Figure 3

GE PROPRIETARY INFORMATION - Subject to the restrictions on the media.

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

reproduced without the express written consent of GE. Technical data is considered {Page}
{cd} ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG 

authorization, is strictly prohibited.