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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1306 Original Issue: September 10, 2015 ATA System: 2741 3151 7611 SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizers - Stabilizer Trim Control System for 737-700 Airplanes with Blended Winglets - Change 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Unpublished Work.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: September 10, 2015 737-27A1306 1 of 20
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 2 of 20 BOEING SERVICE BULLETIN 737-27A1306
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BLANK PAGE
Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected10
B. Concurrent Requirements10
C. Reason10
D. Description11
E. Compliance11
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:12
3. Installation Drawings Used in the Preparation of this Service Bulletin:12
K. Publications Affected12
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 Availability15
F. Special Tooling Necessary to do this Service Bulletin15
3. ACCOMPLISHMENT INSTRUCTIONS17
A. GENERAL INFORMATION17
B. WORK INSTRUCTIONS18
FIGURE 1: FLIGHT COMPARTMENT CONTROL STAND - STABILIZER TRIM LIGHTPLATES - REMOVAL
.19
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 3 of 20 BOEING SERVICE BULLETIN 737-27A1306
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 4 of 20 BOEING SERVICE BULLETIN 737-27A1306
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-27A1306Original Issue: September 10, 2015 ATA System: 2741 3151 7611 SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizers - Stabilizer Trim Control System for 737-700 Airplanes with Blended Winglets - Change
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 Refer to Paragraph 1.B., Concurrent Requirements.
BACKGROUND Accomplishment of this service bulletin will make sure the greenband limits for the trim control result in safe limits for take-off with a stabilizer mis-trim when an airplane with blended winglets has a lighter take-off weight with the load in an aft position, a flap detent position of 10, 15 or 25, and a high take-off thrust. If this service bulletin is not done, the trim control limits will allow a mis-trimmed take-off during which airspeed cannot be controlled, which can result in unsafe flight conditions.
The trim control system was recently analyzed for nose-up mis-trim occurrences during take-off for airplanes with blended winglets and was found to not be in accordance with the certification rules in specific conditions.
The greenband limits for trim control were moved in the nose-up direction for 737-700 airplanes with blended winglets during development to be in accordance with certification criteria for nose-down mis-trim conditions.
The recent analysis found that at higher flap detent positions, with lighter take-off weights and a high take-off thrust, the trim control greenband limits are incorrect, which could cause the take-off stabilizer trim position to be set outside safe limits for take-off. The incorporation of this service bulletin will make sure that the nose-up pitch trim will be set within safe limits for take-off.
For 737-700 aircraft with blended winglets certified by Boeing type certificate, this service bulletin, together with Aviation Partners Boeing Service Bulletin AP737-27-002, gives instructions to replace the control stand stabilizer trim lightplates in the flight compartment with one that has smaller greenband limits and to change the location of the nose-up take-off warning limit switches. This service bulletin also gives instructions to install new Flight Management Computer (FMC) Model/Engine Database (MEDB) software, which includes revised take-off settings due to the smaller greenband limits.
Boeing Service Related Problem (SRP) 737NG-SRP-27-0252 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737NG FTD 27-14005 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 5 of 20
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 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 AffectedYesPublications Affected Paragraph 1.K., Publications AffectedYesAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsYesKits/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 YesSpecial Tooling Required ACTION (PRR 38275-196S) Change the location of the stabilizer take-off warning limit switches, replace the control stand stabilizer trim lightplates in the flight compartment and install new FMC MEDB software.
EFFECTIVITY 737-700/700C 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.
Boeing recommends that the change given in this service bulletin be done within 72 months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of March 20, 2014. 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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 6 of 20 BOEING SERVICE BULLETIN 737-27A1306
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MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 7 of 20 BOEING SERVICE BULLETIN 737-27A1306
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 8 of 20 BOEING SERVICE BULLETIN 737-27A1306
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-27A1306 Original Issue: September 10, 2015 ATA System: 2741 3151 7611 SUBJECT: FLIGHT CONTROLS - Horizontal Stabilizers - Stabilizer Trim Control System for 737-700 Airplanes with Blended Winglets - Change
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 D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is applicable to 737-700/700C Airplanes with blended winglets, line numbers 3128 - 5279, in 1 Group. The Variable Numbers and Group Information for the applicable airplanes is given below. An equivalent change is on subsequent production airplanes. Refer to PRR 38275-196S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 737-700/700C airplanes delivered with blended winglets certified by Boeing type certificate.
-1 Airplane Models:
737-700, 737-700C GroupVariable Number 1YG104 1YG125 - YG143 1YG510 - YG514 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 9 of 20
2. Spares Affected None.
B. Concurrent Requirements The service bulletin listed below must be done at the same time as this service bulletin:
DescriptionService BulletinCompany Change the location of the stabilizer take-off warning limit switches and replace the control stand stabilizer trim lightplates. Also install new Flight Management Computer (FMC) Model/Engine Database (MEDB) software.
AP737-27-002, Original IssueAviation Partners Boeing C. Reason Accomplishment of this service bulletin will make sure the greenband limits for the trim control result in safe limits for take-off with a stabilizer mis-trim when an airplane with blended winglets has a lighter take-off weight with the load in an aft position, a flap detent position of 10, 15 or 25, and a high take-off thrust. If this service bulletin is not done, the trim control limits will allow a mis-trimmed take-off during which airspeed cannot be controlled, which can result in unsafe flight conditions.
The trim control system was recently analyzed for nose-up mis-trim occurrences during take-off for airplanes with blended winglets and was found to not be in accordance with the certification rules in specific conditions. The greenband limits for trim control were moved in the nose-up direction for 737-700 airplanes with blended winglets during development to be in accordance with certification criteria for nose-down mis-trim conditions. The recent analysis found that at higher flap detent positions, with lighter take-off weights and a high take-off thrust, the trim control greenband limits are incorrect, which could cause the take-off stabilizer trim position to be set outside safe limits for take-off. The incorporation of this service bulletin will make sure that the nose-up pitch trim will be set within safe limits for take-off.
For 737-700 aircraft with blended winglets certified by Boeing type certificate, this service bulletin, together with Aviation Partners Boeing Service Bulletin AP737-27-002, gives instructions to replace the control stand stabilizer trim lightplates in the flight compartment with one that has smaller greenband limits and to change the location of the nose-up take-off warning limit switches. This service bulletin also gives instructions to install new Flight Management Computer (FMC) Model/Engine Database (MEDB) software, which includes revised take-off settings due to the smaller greenband limits.
Boeing Service Related Problem (SRP) 737NG-SRP-27-0252 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737NG FTD 27-14005 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 10 of 20 BOEING SERVICE BULLETIN 737-27A1306
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D. Description Change the location of the stabilizer take-off warning limit switches, replace the control stand stabilizer trim lightplates in the flight compartment and install new FMC MEDB software.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 211, 212, 311, 312737-700, 737-700C 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.
Boeing recommends that the change given in this service bulletin be done within 72 months after the original issue date of this service bulletin.
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 change 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:
• 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
0.250.251FIGURE 1 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 11 of 20 BOEING SERVICE BULLETIN 737-27A1306
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Elapsed HoursTask HoursNumber of PersonsTask
0.250.25TOTAL FOR EACH AIRPLANE This estimate does not include the task hour data given in the service bulletin(s) in Paragraph 1.B., Concurrent Requirements. Refer to Aviation Partners Boeing Service Bulletin AP737-27-002.
H. Weight and Balance Changes None.
I. Electrical Load Data Not changed.
J. References
1. Existing Data:
a. Engineering Change Memo PRR 38275-196S
b. Boeing Service Related Problem (SRP) 737NG-SRP-27-0252
c. Service Bulletin Index D6-19567
d. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 76-11-03
e. 737NG Fleet Team Digest (FTD) 27-14005
f. Aviation Partners Boeing Service Bulletin AP737-27-002 NOTE: The supplier was told to send copies of this service bulletin to each operator.
2. Data Supplied with this Service Bulletin:
None.
3. Installation Drawings Used in the Preparation of this Service Bulletin:
Refer to Aviation Partners Boeing Service Bulletin AP737-27-002.
K. Publications Affected
1. Publications:
Chapter-SectionPublication Appendix 31737 FAA Approved Airplane Flight Manual 27-41, 31-51737-600/700/800/900 Aircraft Maintenance Manual Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: September 10, 2015 737-27A1306 12 of 20 BOEING SERVICE BULLETIN 737-27A1306