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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-21A2571 Original Issue: December 04, 2015 ATA System: 2121 SUBJECT: AIR CONDITIONING - Distribution - Occupant Backup Air Supply Flex Hose and Clamp
- Inspection Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2015 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.
Original Issue: December 04, 2015 747-21A2571 1 of 46
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 2 of 46 BOEING SERVICE BULLETIN 747-21A2571
ALERTALERT
BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected10
B. Concurrent Requirements10
C. Reason10
D. Description10
E. Compliance10
F. Approval11
G. Manpower11
H. Weight and Balance Changes12
I. Electrical Load Data12
J. References12
1. Existing Data:12
2. Data Supplied with this Service Bulletin:13
3. Installation Drawings Used in the Preparation of this Service Bulletin:13
K. Publications Affected13
L. Interchangeability and Intermixability of Parts13
M. Software Accomplishment Summary13
2. MATERIAL INFORMATION15
A. Material - Price and Availability15
B. Industry Support Information15
C. Parts Necessary for Each Airplane15
1. Kits/Parts15
2. Parts and Materials Supplied by the Operator15
3. Parts Modified and Reidentified15
4. Parts Removed and Not Replaced15
D. Parts Necessary to Change Spares15
E. Special Tooling - Price and Availability16
F. Special Tooling Necessary to do this Service Bulletin16
3. ACCOMPLISHMENT INSTRUCTIONS17
A. GENERAL INFORMATION17
B. WORK INSTRUCTIONS18
FIGURE 1: MAIN DECK PASSENGER COMPARTMENT - FLOOR PANEL REMOVAL21
FIGURE 2: MAIN DECK PASSENGER COMPARTMENT - FLOOR PANEL REMOVAL23
FIGURE 3: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY - CLAMP
DETAILED INSPECTION25
FIGURE 4: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY - CLAMP
TORQUE CHECK27
FIGURE 5: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY - CORRECT
CLAMP TORQUE APPLICATION29
FIGURE 6: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY - FLEX
HOSE GENERAL VISUAL INSPECTION31
FIGURE 7: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY - FLEX
HOSE REPLACEMENT33
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 3 of 46 BOEING SERVICE BULLETIN 747-21A2571
ALERTALERT
FIGURE 8: MAIN DECK PASSENGER COMPARTMENT - OCCUPANT BACKUP AIR SUPPLY -
INSTALLATION CORRECTION37
FIGURE 9: MAIN DECK PASSENGER COMPARTMENT - FLOOR PANEL INSTALLATION40
FIGURE 10: MAIN DECK PASSENGER COMPARTMENT - FLOOR PANEL INSTALLATION42
APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: OCCUPANT BACKUP
AIR SUPPLY - CLAMP AND FLEX HOSE INSPECTIONS44
APPENDIX B: PRESSURE SENSITIVE TAPE INSTALLATION (BAC 5801)46
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 4 of 46 BOEING SERVICE BULLETIN 747-21A2571
ALERTALERT
Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-21A2571Original Issue: December 04, 2015 ATA System: 2121 SUBJECT: AIR CONDITIONING - Distribution - Occupant Backup Air Supply Flex Hose and Clamp
- Inspection
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Accomplishment of this service bulletin will make sure that the inboard clamp for the flex hose for the occupant backup air supply is installed correctly. If this service bulletin is not done, the flex hose for the occupant backup air supply can become disconnected and in the occurrence of a cargo fire, the decreased airflow to the main deck could let smoke and/or toxic fumes into the main deck passenger compartment which could result in serious or fatal passenger or cabin crew injuries.
An operator found a flex hose of the occupant backup air supply, disconnected from the adjacent fiberglass duct on two airplanes during a maintenance visit. One of the flex hoses had a tear on the disconnected edge. A Boeing investigation found that these incidents were caused by the incorrect installation of clamp on the inboard end of the flex hose, which let the flex hose to slowly become disconnected from the adjacent fiberglass duct.
No related system faults were reported.
This service bulletin gives instructions to do a detailed inspection of the inboard clamp of the occupant backup air supply to make sure it is installed correctly and a general visual inspection of the flex hose to make sure it is not damaged.
Boeing Service Related Problem (SRP) 747-8-SRP-21-0232 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 747 FTD 21-15001 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 5 of 46
ReferenceAffectedPlanning Data Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator YesOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Do a detailed inspection of the clamp at the inboard end of the flex hose connection to find if the clamp is located correctly. If the clamp is located correctly, do a check of the clamp torque. Apply the correct torque if the clamp is found to be incorrectly torqued. If the clamp is not located correctly, do a general visual inspection of the flex hose for damage. Replace damaged flex hose.
EFFECTIVITY 747-8 Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of May 6, 2015. Please refer to Paragraph
2.B., Industry Support Information. The warranty remedies will expire eight years from the original issue date of this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 6 of 46 BOEING SERVICE BULLETIN 747-21A2571
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BOEING SERVICE BULLETIN 747-21A2571
ALERT ALERT Refer to Paragraph 2.A., Material - Price and Availability.
STA 1241 STA 1241 ALBL
33.99
OCCUPANT
BACKUP AIR
SUPPLY DUCT FLOOR BEAM
FLEX HOSE ASSEMBLY
DO A DETAILED INSPECTION OF THE CLAMP FOR CORRECT CLAMP LOCATION. IF THE
CLAMP IS CORRECTLY LOCATED DO A CHECK
OF THE CLAMP TORQUE AND CORRECT THE TORQUE IF NECESSARY. IF THE CLAMP IS
INCORRECTLY LOCATED DO A GENERAL
VISUAL INSPECTION OF THE FLEX HOSE FOR FOUND DAMAGED. DAMAGE. REPLACE THE FLEX HOSE IF IT IS 2450749 Original Issue: December 04, 2015 Export Controlled ECCN: 9E991 - BOEING 747-21A2571 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 46
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 8 of 46 BOEING SERVICE BULLETIN 747-21A2571
ALERTALERT
BLANK PAGE
Commercial Airplanes 747 Service Bulletin ALERT Number: 747-21A2571 Original Issue: December 04, 2015 ATA System: 2121 SUBJECT: AIR CONDITIONING - Distribution - Occupant Backup Air Supply Flex Hose and Clamp
- Inspection
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is applicable to 747-8 Airplanes, line numbers 1434-1508, except 1435, 1495 and 1506, in 1 Group. The Variable Numbers and Group Information for the applicable airplanes is given below.
DESCRIPTIONCONFIGURATIONGROUP 747-8 Airplanes that may have an incorrectly installed clamp at the inboard end of the flex hose for the occupant backup air supply.
-1 Airplane Models:
747-8 GroupVariable Number 1RC001 - RC008 1RC022 - RC036 1RC066 - RC068 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 9 of 46
2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason Accomplishment of this service bulletin will make sure that the inboard clamp for the flex hose for the occupant backup air supply is installed correctly. If this service bulletin is not done, the flex hose for the occupant backup air supply can become disconnected and in the occurrence of a cargo fire, the decreased airflow to the main deck could let smoke and/or toxic fumes into the main deck passenger compartment which could result in serious or fatal passenger or cabin crew injuries.
An operator found a flex hose of the occupant backup air supply, disconnected from the adjacent fiberglass duct on two airplanes during a maintenance visit. One of the flex hoses had a tear on the disconnected edge. A Boeing investigation found that these incidents were caused by the incorrect installation of clamp on the inboard end of the flex hose, which let the flex hose to slowly become disconnected from the adjacent fiberglass duct. No related system faults were reported.
This service bulletin gives instructions to do a detailed inspection of the inboard clamp of the occupant backup air supply to make sure it is installed correctly and a general visual inspection of the flex hose to make sure it is not damaged.
Boeing Service Related Problem (SRP) 747-8-SRP-21-0232 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 747 FTD 21-15001 is related to this service bulletin.
D. Description Do a detailed inspection of the clamp at the inboard end of the flex hose connection to find if the clamp is located correctly. If the clamp is located correctly, do a check of the clamp torque. Apply the correct torque if the clamp is found to be incorrectly torqued. If the clamp is not located correctly, do a general visual inspection of the flex hose for damage. Replace damaged flex hose.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 131A747-8 E. Compliance The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Do the required actions in accordance with Paragraph 3., Accomplishment Instructions.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 10 of 46 BOEING SERVICE BULLETIN 747-21A2571
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A logic diagram showing compliance tasks and compliance times is included as an aid in APPENDIX A.
Table 1: OCCUPANT BACKUP AIR SUPPLY - CLAMP AND FLEX HOSE INSPECTIONS Repeat Interval (Not to Exceed) Compliance TimeActionCondition -Within 36 months after the original issue date of this service bulletin.
Do PART 1: CLAMP DE- TAILED INSPECTION to find if the clamp is located correctly.
All airplanes -Before further flight.
Do PART 2: CLAMP TORQUE CHECK for the correct torque.
CONDITION 1: CLAMP LOCATED CORRECTLY.
-Before further flight.
Do PART 3: CORRECT
CLAMP TORQUE APPLI- CATION.
CONDITION 2: CLAMP TORQUE IS NOT 13 TO 17 INCH-POUNDS.
--No further action is necessary.
CONDITION 3: CLAMP TORQUE IS 13 TO 17 INCH-POUNDS.
-Before further flight.
Do PART 4: FLEX HOSE
GENERAL VISUAL IN- SPECTION for damage.
CONDITION 4: CLAMP
LOCATED INCORRECT- LY.
-Before further flight.
Do PART 5: FLEX HOSE REPLACEMENT.
CONDITION 5: FLEX HOSE HAS DAMAGE.
-Before further flight.
Do PART 6: INSTALLA- TION CORRECTION.
CONDITION 6: FLEX HOSE HAS NO DAMAGE.
F. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin.
G. Manpower The table below shows an estimate of the task hours necessary to do this service bulletin for each airplane. This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator task hour data if necessary. The estimate does not include lost time. These are some examples of lost time:
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 11 of 46 BOEING SERVICE BULLETIN 747-21A2571
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• Time to adjust to the workplace
• Time to schedule the work
• Time to inspect the work
• Time to cure the materials
• Time to make the parts
• Time to find the tools.
Elapsed HoursTask HoursNumber of PersonsTask
1.251.251Open Access
0.500.501FIGURE 1
0.700.701FIGURE 2 (a)
0.100.101FIGURE 3
0.100.101FIGURE 4 (b)
0.100.101FIGURE 5 (c)
0.100.101FIGURE 6 (d)
0.500.501FIGURE 7 (a)
0.150.151FIGURE 8 (e)
0.350.351FIGURE 9
0.500.501FIGURE 10 (a)
1.251.251Close Access
(f)(f)TOTAL FOR EACH AIRPLANE
(a) Only necessary if Condition 5 is found.
(b) Only necessary if Condition 1 is found.
(c) Only necessary if Condition 2 is found.
(d) Only necessary if Condition 4 is found.
(e) Only necessary if Condition 6 is found.
(f) A total is not given because the task usage is variable. Add the values of the applicable tasks to get the total.
H. Weight and Balance Changes None.
I. Electrical Load Data Not changed.
J. References
1. Existing Data:
a. Boeing Service Related Problem (SRP) 747-8-SRP-21-0232 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: December 04, 2015 747-21A2571 12 of 46 BOEING SERVICE BULLETIN 747-21A2571