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Commercial Airplane Group 747 Service Bulletin Number: 747-24A2168 Revision Transmittal SheetDate: September 24, 1991 Revision 3: July 29, 1993 ATA System: 2451 SUBJECT: ELECTRICAL POWER - INSPECTION OF THE CLEARANCE BETWEEN THE POWER
FEEDER CABLES AND FUEL TUBE, AND MODIFICATION OF THE POWER FEEDER
CABLE SUPPORT BRACKETS This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Airworthiness Directive 92-27-13, Amendment 39-8448 is related to this service bulletin.
No more work is necessary on airplanes changed by Revision 2 of this service bulletin.
SUMMARY This revision is sent to make these changes:
- Add a step to remove pneumatic duct for access to the installation area and a step to check a clearance between the bracket and the adjacent pneumatic duct.
- Add installation of optional spacers if required to increase the clearance between power feeder cables and the bracket.
- Add installation of optional spacers if required to fill the gap between the inboard leg of new bracket and the existing bracket.
Vertical lines are put on the left edge of each page, except in Paragraph I.A., Effectivity, to show the location of important changes.
Pages with a revision number and date, but no vertical lines, have no important changes.
REVISION HISTORY Initial Release: September 24, 1991 Revision 1: December 5, 1991 Revision 2: September 24, 1992 Revision 3: July 29, 1993 BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE, WASHINGTON 98124-2207
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Commercial Airplane Group 747 Service Bulletin Number: 747-24A2168 SummaryDate: September 24, 1991 Revision 3: July 29, 1993 ATA System: 2451 SUBJECT: ELECTRICAL POWER - INSPECTION OF THE CLEARANCE BETWEEN THE POWER
FEEDER CABLES AND FUEL TUBE, AND MODIFICATION OF THE POWER FEEDER
CABLE SUPPORT BRACKETS
BACKGROUND This service bulletin is issued to inspect the clearance between the fuel tube and the power feeder cables in number 2 and 3 struts, and to install the power feeder support brackets to separate the cables from the fuel tube. On one airplane, a hole developed in number 2 strut fuel tube due to chafing between the fuel tube and the power feeder cables.
This resulted in a fire in number 2 strut.
ACTION (PRR 82874) Phase I: Inspect the clearance between the power feeder cables and the fuel tube in number 2 and 3 struts on Group 1 and 2 airplanes, and in number 3 strut on Group 3 and 4 airplanes.
Phase II: On Group 2, 3, and 4 airplanes, install new cable support brackets in number 2 and 3 struts.
COMPLIANCE Federal Aviation Administration (FAA) Airworthiness Directive 92-27-13, Amendment 39-8448 is related to this service bulletin.
EFFECTIVITY Group 1: 747-200 and -300 airplanes line number 679, 681, 685, 688, 701, 702, 703, 711, and 719 Group 2: 747-400 airplanes line number 696 through 734 Group 3: 747-400 airplanes line number 735-843, 845-850, 852-870, 872-875, 877 Group 4: 747-400 airplanes line number 880-884 and 887
MANPOWER Task Total Man-hours Elapsed Time (Hours) Phase I - Inspection 2 1 Phase II -Installation 9 8.5
MATERIAL INFORMATION Kit Date Available Price 015U0766-1 April 10, 1992 No Charge Refer to Paragraph I.G., Material - Price and Availability.
BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE, WASHINGTON 98124-2207 Summary Page 1 of 2
BOEING SERVICE BULLETIN 747-24A2168
INSTALL NEW CABLE SUPPORT BRACKETS TO
SEPARATE THE POWER FEEDER CABLE FROM
THE FUEL TUBE PHASE II:
FUEL TUBE PHASE I:
FSSI
671.09
INSPECT THE CLEARANCE
BETWEEN THE FUEL TUBE
AND THE POWER FEEDER CABLES
POWER FEEDER CABLES
FRONT WING SPAR FWD
RIGHT SIDE OPPOSITE
LEFT SIDE SHOWN UP INBD 985469 Sep 24/91 REV 1: Sep 5/91 Summary Page 2 of 2
Commercial Airplane Group 747 Service Bulletin Number: 747-24A2168 Date: September 24, 1991 Revision 3: July 29, 1993 ATA System: 2451 SUBJECT: ELECTRICAL POWER - INSPECTION OF THE CLEARANCE BETWEEN THE POWER
FEEDER CABLES AND FUEL TUBE, AND MODIFICATION OF THE POWER FEEDER
CABLE SUPPORT BRACKETS I. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D6-30300, Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for only these airplanes:
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
AIR CANADA (ACN) 3 RT101-RT103
AIR CHINA (BEJ) 3 RT031-RT033
AIR FRANCE (AFA) 3 RT071 RT121 RT591 RT711-RT712 4 RT072
AIR INDIA (AIN) 1 RS781-RS782 AIR NEW ZEALAND, LTD. (ANZ) 3 RT671-RT672 ALL NIPPON AIRWAYS CO. LTD. (ANA) 3 RT751-RT753 RT776-RT777
ASIANA AIRLINES (AAR) 4 RT131
BRITISH AIRWAYS (BAB) 2 RT471-RT473 3 RT474-RT489 Sep 24/91 747-24A2168 REV 3: Jul 29/93 Page 1 of 23
BOEING SERVICE BULLETIN 747-24A2168 CANADIAN AIRLINES INTERNATIONAL LTD. (CDI) 3 RT701-RT702 CATHAY PACIFIC AIRWAYS, LTD. (CAT) 2 RT451-RT452 3 RT453-RT459 4 RT460 CHINA AIR LINES, INC. (CHI) 3 RT631-RT633
GOVERNMENT OF JAPAN (JAG) 3 RT681-RT682
JAPAN AIRLINES (JAL) 3 RT641-RT650
KLM ROYAL DUTCH AIRLINES (KLM) 2 RT531-RT532 3 RT001-RT007 RT533 KOREAN AIR LINES, INC. (KAL) 2 RT571 3 RT061 RT572-RT576
LUFTHANSA GERMAN AIRLINES (DLH) 2 RT431-RT432 3 RT041-RT047 RT433-RT438
MALAYSIAN AIRLINES SYSTEM BERHAD (MAS) 3 RT021-RT022 RT741-RT742 NORTHWEST AIRLINES, INC. (NWA) 2 RT401-RT405 3 RT406-RT410 QANTAS AIRWAYS, LTD. (QAN) 2 RT551 3 RT552-RT563 4 RT564
SINGAPORE AIRLINES, LTD (SIA) 2 RT501-RT502 3 RT503-RT512
SOUTH AFRICAN AIRWAYS (SAA) 3 RT781-RT782 S583 (583) 1 RD166-RD167 THAI AIRWAYS INTERNATIONAL, INC. (TII) 1 RS341-RS342 3 RT691-RT693 Sep 24/91 747-24A2168 REV 1: Sep 5/91 2
BOEING SERVICE BULLETIN 747-24A2168 UNITED AIR LINES, INC. (UAL) 2 RT601 3 RT602-RT610 4 RT611-RT612
VARIG AIRLINES (VAR) 1 RS331-RS333 3 RT703
IDENTIFICATION BY VARIABLE NUMBER GROUP 1 RD166-RD167 RS331-RS333 RS341-RS342 RS781-RS782 GROUP 2 RT401-RT405 RT431-RT432 RT451-RT452 RT471-RT473 RT501-RT502 RT531-RT532 RT551 RT571 RT601 GROUP 3 RT001-RT007 RT021-RT022 RT031-RT033 RT041-RT047 RT061 RT071 RT101-RT103 RT121 RT406-RT410 RT433-RT438 RT453-RT459 RT474-RT489 RT503-RT512 RT533 RT552-RT563 RT572-RT576 RT591 RT602-RT610 RT631-RT633 RT641-RT650 RT671-RT672 RT681-RT682 RT691-RT693 RT701-RT703 RT711-RT712 RT741-RT742 RT751-RT753 RT776-RT777 RT781-RT782 GROUP 4 RT072 RT131 RT460 RT564 RT611-RT612
2. Spares None Sep 24/91 747-24A2168 REV 1: Sep 5/91 3
BOEING SERVICE BULLETIN 747-24A2168 B. Reason This service bulletin is issued to inspect the clearance between the fuel tube and the power feeder cables in number 2 and 3 struts, and to install the power feeder support brackets to separate the cables from the fuel tube. On one airplane, a hole developed in number 2 strut fuel tube due to chafing between the fuel tube and the power feeder cables. This resulted in a fire in number 2 strut.
Revision 1 is sent to formalize the service bulletin that was originally sent telegraphically, to add the modification that will terminate the clearance inspection, to add two groups of airplanes to the service bulletin effectivity, and to revise the strut drain inspection in Step G of Section III, Accomplishment Instructions.
Revision 2 is sent to allow usages of the optional brackets and clarify usages of the support brackets and the wire support clamps.
Revision 3 is sent to add a step to remove the pneumatic duct for access to the installation area and a step to check the clearance between the bracket and the adjacent pneumatic duct. Installation of optional spacers is added if required to increase the clearance between power feeder cables and the bracket. Installation of optional spacers is added if required to fill the gap between the inboard leg of new bracket and the existing bracket.
C. Description Phase I: At the first opportunity where manpower and facilities are available, the clearance between the power feeder cables and the fuel tube in number 2 and 3 struts is inspected on Group 1 and 2 airplanes, and in number 3 strut on Group 3 airplanes. Within 1000 flight hours, the clearance between the power feeder cables and the fuel tube in number 3 strut is inspected on Group 4 airplanes.
Phase II: Within 12 months after receipt of Revision 1 of this service bulletin, the cable support brackets are installed on Group 2, 3, and 4 airplanes to separate the power feeder cables from the fuel tube.
Airplane effectivity is divided into groups because of the requirement of the inspection and installation.
Revision 1 - No more work is necessary on Group 1 airplanes changed by the initial release of this service bulletin and more work is necessary on Group 2 airplanes changed by the initial release of this service bulletin.
Revision 2 - No more work is necessary on airplanes changed by Revision 1 of this service bulletin.
Revision 3 - No more work is necessary on airplanes changed by Revision 2 of this service bulletin.
The changes in this service bulletin will not change the Central Maintenance Computer System (CMCS).
NOTE: Evaluation of service bulletin 747-36-2112 is recommended during accomplishment of the changes specified in this service bulletin.
Sep 24/91 747-24A2168 REV 3: Jul 29/93 4
BOEING SERVICE BULLETIN 747-24A2168 D. Compliance Federal Aviation Administration (FAA) Airworthiness Directive 92-27-13, Amendment 39-8448, is related to this service bulletin.
E. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The repairs and changes specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and are FAA approved.
The FAA has examined the inspection and repair procedures specified in Revision 2 to Service Bulletin 747-24A2168, "Electrical Power - Inspection of the Clearance between the Power Feeder Cables and Fuel Tube, and Modification of the Power Feeder Cable Support Brackets". The FAA has approved the inspection and repair procedures as an alternative to those specified in Airworthiness Directive (AD) 92-27-13, Amendment 39-8448.
F. Manpower The data below shows an estimate of the man-hours necessary to do this inspection and installation for each airplanes. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator man-hour data if necessary. The estimate does not include lost time. These are some examples of lost time:
- Time to adjust to the workplace
- Time to schedule the work
- Time to examine the work
- Time to cure the materials
- Time to make the parts
- Time to find the tools.
Task Number of Persons Man-Hours Elapsed Time (Hours) Phase I Inspection 2 2 1 Phase II Open Access 1 2 2 Change 1 4 4 Test 2 1 0.5 Close Access 1 2 2 TOTAL FOR STRUT 9 8.5 Sep 24/91 747-24A2168 REV 3: Jul 29/93 5
BOEING SERVICE BULLETIN 747-24A2168 G. Material - Price and Availability Boeing can supply the kit shown in Paragraph II.A., Parts Necessary For Each Airplane, as shown below. If there is a limit in the quantity of kits, a supply sequence is given by Spares.
Kit Number Name Date Quantity Unit Price 015U0766-1 Kit, Power Feeder Cable Support Bracket Installation April 10, 1992 50 No Charge May 11, 1992 50 No Charge June 10, 1992 50 No Charge July 10, 1992 6 No Charge Items shown as "No Charge" can change to "Charge" after 180 days from the date shown above.
The kits are subject to the terms and conditions of the Boeing's standard purchase order acknowledgment. The prices are subject to acceptance within 180 days from the date shown above.
After 180 days, new price data is applicable. Prices are in United States Dollars. Terms: Net 30 days.
Send purchase orders and letters about the supply data to the Director of Spares and refer to this service bulletin number.
H. Special Tools - Price and Availability None I. Weight and Balance Change in Weight (Pounds) Change in Moment (Pound-Inches) Phase I None None Phase II +3.5 +4358 Sep 24/91 747-24A2168 REV 1: Sep 5/91 6
BOEING SERVICE BULLETIN 747-24A2168 J. References
1. Existing Data:
a. 747 or 747-400 Maintenance Manual Subjects 06-09-08, 24-22-00, 28-22-07, 51-20-01, 51-24-00, and 54-10-02 or 54-53-00
b. Overhaul Manual 28-00-10
c. Boeing Standard Wiring Practices Manual 20-10-13
d. Boeing Service Bulletin 747-36-2112, "Pneumatic System - Engine Bleed Air Distribution System - Leading Edge Duct Change"
e. FAA Airworthiness Directive 92-27-13, Amendment 39-8448
2. Data supplied with this service bulletin:
None K. Publications Changed None L. Electrical Load Data Not changed Sep 24/91 747-24A2168 REV 3: Jul 29/93 7
BOEING SERVICE BULLETIN 747-24A2168 II. MATERIAL INFORMATION A. Parts Necessary For Each Airplane
1. To get the kit shown below, refer to Paragraph I.G., Material - Price and Availability.
NOTE: One top kit is necessary for each airplane in Group 2, 3, and 4 airplanes.
015U0766 - KIT, POWER FEEDER CABLE SUPPORT BRACKET INSTALLATION -1 Quantity Part Number Name
- 015U0766-1 Kit, Power Feeder Cable Support Bracket Installation 1 287U1220-1 (optional 287U1220-31) Bridge Bracket (Number 2 strut) 1 287U1220-2 (optional 287U1220-32) Bridge bracket (Number 3 strut) 1 287U1220-23 Support Bracket (Number 3 strut) 1 287U1220-24 Support Bracket (Number 2 strut) 1 287U1220-27 (optional 287U1220-37) Support Bracket (Number 2 strut) 1 287U1220-28 (optional 287U1220-38) Support Bracket (Number 3 strut) 8 TA025090-16 Clamp 1 BACC10GU102 Clamp 2 BACC10GU104 Clamp 8 BACB30VT5K2 Bolt 2 BACB30NF4-14 Bolt 2 BACB30NF4-16 Bolt 6 BACB30FP6-4 Bolt 10 NAS1801-3-10 Screw 8 BACR15BB5AD6 Rivet 8 BACC30BL5 Collar 6 BACC30M6 Collar 8 AN960C10 Washer 4 AN960D416 Washer 2 AN960JD10L Washer Sep 24/91 747-24A2168 REV 1: Sep 5/91 8