### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Number: 747-27A2515**  Original Issue: August 23, 2013 ATA System: 2731 5520 **SUBJECT:** FLIGHT CONTROLS - Elevator Control System - Inboard Elevator Power Control Actuator (PCA) Installation - 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2013 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 Unpublished Work.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Original Issue: August 23, 2013 747-27A2515 1 of 29 2.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 2 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**

BLANK PAGE**Table of Contents** Summary...................................................... 5 1. PLANNING INFORMATION ........................................ 9 A. Effectivity................................................ 9 1. Airplanes............................................. 9 2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 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 Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 M. Software Accomplishment Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 C. Parts Necessary for Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2. Parts and Materials Supplied by the Operator. . . . . . . . . . . . . . . . . . . . . . . . 15 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 15 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 FIGURE 1: LEFT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 FIGURE 2: RIGHT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 3 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 4 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Summary**  **Number: 747-27A2515** Original Issue: August 23, 2013 ATA System: 2731 5520 **SUBJECT:** FLIGHT CONTROLS - Elevator Control System - Inboard Elevator Power Control Actuator (PCA) Installation - 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** This service bulletin gives instructions to inspect the left and right inboard elevator power control actuator (PCA) installations to make sure that bushings are installed where the actuator rod ends are attached to the lugs. It also gives instructions to inspect the general area around each actuator, to make sure that there are no other defects or damage. If the bushings are not installed, the stiffness of the load path will be decreased, which will cause wear of adjacent parts and increased freeplay of the elevator surfaces. Freeplay which exceeds acceptable limits could result in divergent flutter for maneuvers above 1.6 g, which could lead to loss of controllability of the airplane. During a recent C-check, an operator heard an unusual noise coming from the left inboard elevator during a functional check of the ram air turbine system. When investigating the cause of the noise, the operator found too much freeplay in the left inboard elevator, which they traced to a missing bushing in the PCA installation. A Boeing quality investigation found that the left inboard PCA had been disconnected from this airplane to replace the left elevator, which had been damaged before delivery. When the PCA was reconnected, however, the bushing was not installed. The operator did a detailed inspection of the PCA installation and a high-frequency eddy current (HFEC) inspection of the PCA attachment lug assembly, and found no other defects or damage. As part of the Boeing quality investigation, all 747-8 airplanes currently in production were inspected to make sure that the bushings were installed on both the left and right sides. Boeing also inspected each production airplane between the horizontal stabilizer rear spar and the elevator front spar to make sure that there were no other defects or damage. This service bulletin was written for operators to do the same inspections on airplanes that have been delivered. Boeing Service Related Problem (SRP) 747-8-SRP-27-0241 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 747 FTD 27-13005 is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 5 of 29This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
**Reference Affected**  **Planning Data** Paragraph 1.A.2., Spares Affected No Spares Affected Paragraph 1.E., Compliance and Paragraph 1.F., Approval Yes AD Related Paragraph 1.H., Weight and Balance Changes No Weight and Balance Change Paragraph 1.I., Electrical Load Data No Electrical Load Changed Paragraph 1.K., Publications Affected No Publications Affected Paragraph 1.K., Publications Affected No Airplane Flight Operations Affected (Flight CrewOperations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/Parts No Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator No Operator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required

**ACTION** Open access to the left and right inboard elevator PCA installations. Do a detailed inspection of each PCA installation to find if a bushing is installed, in accordance with PART 1. On each side, do a general visual inspection for defects or damage in accordance with PART 2. If a bushing is not installed, or if any defect or damage is found during the general visual inspection, contact Boeing for repair instructions and do the repair. Close access. **EFFECTIVITY** 747-8 and -8F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes. **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** At the time of release of this service bulletin, warranty remedies have not been determined. A subsequent revision or Information Notice will address the warranty remedies available, if any. **MANPOWER** Refer to Paragraph 1.G., Manpower.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 6 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT MATERIAL INFORMATION**  None.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 7 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 8 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 747 Service Bulletin **ALERT Number: 747-27A2515**  Original Issue: August 23, 2013 ATA System: 2731 5520 **SUBJECT:** FLIGHT CONTROLS - Elevator Control System - Inboard Elevator Power Control Actuator (PCA) Installation - 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 for the airplane(s) shown below.
**DESCRIPTION CONFIGURATION**  **GROUP** All affected airplanes

- 1

Airplane Models: 747-8, 747-8F **Group Variable Number**  1 RC001 - RC008 1 RC022 - RC029 1 RC501 - RC508 1 RC522 - RC523 1 RC541 1 RC546 - RC547 1 RC551 - RC552

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 9 of 29**Group Variable Number**  1 RC554 - RC560 1 RC571 - RC572 1 RC574 - RC582 1 RC601 - RC603 2. Spares Affected None. **B. Concurrent Requirements** None. **C. Reason** This service bulletin gives instructions to inspect the left and right inboard elevator power control actuator (PCA) installations to make sure that bushings are installed where the actuator rod ends are attached to the lugs. It also gives instructions to inspect the general area around each actuator, to make sure that there are no other defects or damage. If the bushings are not installed, the stiffness of the load path will be decreased, which will cause wear of adjacent parts and increased freeplay of the elevator surfaces. Freeplay which exceeds acceptable limits could result in divergent flutter for maneuvers above 1.6 g, which could lead to loss of controllability of the airplane. During a recent C-check, an operator heard an unusual noise coming from the left inboard elevator during a functional check of the ram air turbine system. When investigating the cause of the noise, the operator found too much freeplay in the left inboard elevator, which they traced to a missing bushing in the PCA installation. A Boeing quality investigation found that the left inboard PCA had been disconnected from this airplane to replace the left elevator, which had been damaged before delivery. When the PCA was reconnected, however, the bushing was not installed. The operator did a detailed inspection of the PCA installation and a high-frequency eddy current (HFEC) inspection of the PCA attachment lug assembly, and found no other defects or damage. As part of the Boeing quality investigation, all 747-8 airplanes currently in production were inspected to make sure that the bushings were installed on both the left and right sides. Boeing also inspected each production airplane between the horizontal stabilizer rear spar and the elevator front spar to make sure that there were no other defects or damage. This service bulletin was written for operators to do the same inspections on airplanes that have been delivered. Boeing Service Related Problem (SRP) 747-8-SRP-27-0241 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 747 FTD 27-13005 is related to this service bulletin. **D. Description** Open access to the left and right inboard elevator PCA installations. Do a detailed inspection of each PCA installation to find if a bushing is installed, in accordance with PART 1. On each side, do a general visual inspection for defects or damage in accordance with PART 2. If a bushing is not installed, or if any defect or damage is found during the general visual inspection, contact Boeing for repair instructions and do the repair. Close access.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 10 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 334, 344 747-8, 747-8F **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.**Table 1: Inboard Elevator Power Control Actuator (PCA) Installations - Detailed and General Visual In spections**  **Repeat Interval (Not to Exceed)**  **Compliance Time Action**  **Condition**

- Within 60 days after the Original Issue date of this service bulletin.Do PART 1: INBOARD ELEVATOR PCA INSTALLATIONS - DETAILED INSPECTION. All Airplanes

Do PART 2: INBOARD ELEVATOR PCA INSTALLATIONS -GENERAL VISUAL INSPECTION.

- - No more work is necessary. CONDITION 1: BUSHING IN- STALLED IN BOTH THE LEFT AND RIGHT PCA INSTALLATIONS AND NO DEFECT OR DAMAGEFOUND DURING GENERAL VISUAL INSPECTION

- Before further flight. Contact Boeing for repair instruc- tions and do the repair. CONDITION 2: BUSHING NOT INSTALLED IN THE LEFT OR RIGHT PCA INSTALLATION, OR ANY DEFECT OR DAMAGEFOUND DURING GENERAL VISUAL INSPECTION **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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 11 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**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 inspection 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 Hours Task Hours**  **Number of Persons Task**  0.50 1.00 2 Open Access 0.50 0.50 1 PART 1, Figure 1 0.50 0.50 1 PART 1, Figure 2 1.00 1.00 1 PART 2, Left Side 1.00 1.00 1 PART 2, Right Side 0.50 1.00 2 Close Access 4.00 5.00 TOTAL FOR EACH AIRPLANE **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not applicable. **J. References** 1. Existing Data: a. Boeing Service Letter 747-SL-51-048 b. Boeing Service Related Problem (SRP) 747-8-SRP-27-0241 c. Service Bulletin Index D6-30300 d. 747 Fleet Team Digest (FTD) 27-13005 e. 747-8 Aircraft Maintenance Manual (AMM) 06-09-05, 06-09-06, 29-11-00

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 12 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**2. Data Supplied with this Service Bulletin: None. 3. Installation Drawings Used in the Preparation of this Service Bulletin:
**Title Drawing Number**  POWER CONTROL ACTUATOR INSTL - INBOARD ELEVATOR 251U2500 The table above lists applicable drawings used to prepare this service bulletin. The drawings are not necessary to make the specified changes, and are not supplied with this service bulletin. The drawings may not be applicable to all airplane configurations or operators. **K. Publications Affected** 1. Publications: None. 2. Damage Tolerance Based Structural Inspections: Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary. **L. Interchangeability and Intermixability of Parts** Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts. **M. Software Accomplishment Summary** Not affected.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 13 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 14 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**

BLANK PAGE**2. MATERIAL INFORMATION A. Material - Price and Availability**  None. **B. Industry Support Information** At the time of release of this service bulletin, warranty remedies have not been determined. A subsequent revision or Information Notice will address the warranty remedies available, if any. **C. Parts Necessary for Each Airplane** 1. Kits/Parts None. 2. Parts and Materials Supplied by the Operator None. 3. Parts Modified and Reidentified None. 4. Parts Removed and Not Replaced None. **D. Parts Necessary to Change Spares** None. **E. Special Tooling - Price and Availability** None. **F. Special Tooling Necessary to do this Service Bulletin** No special tools or equipment are necessary to do the change in this service bulletin. But, maintenance and overhaul tools in the manuals given in Paragraph 1.J., References, can be necessary. Examine operator tool supply to make sure all necessary tools are available.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 15 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 16 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**

BLANK PAGE**3. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL INFORMATION**  **CAUTION:** KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE SPARKS OR OTHER ELECTRICAL DAMAGE. **NOTE:** 1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for definition of the acronyms. 2. Obey all of the warnings and cautions given in the specified manual sections. 3. Unless shown differently, these dimensions and tolerances are used: – Linear dimensions are in inches – Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or minus 0.03 inch – Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch – Angular tolerance is plus or minus 2 degrees – Hole dimensions for standard solid rivets and fasteners are in Structural Repair Manual (SRM) Chapter 51 – Torque Values: — Values for structural fasteners are given in 747-8 Structural Repair Manual, Chapter 51. — Values for airframe maintenance tasks are included in Chapter 20 of 747-8 Airplane Maintenance Manual (AMM). — Values for electrical maintenance tasks are included in Chapter 20 of Standard Wiring Practices Manual (SWPM). — Values for engine maintenance tasks are included in Chapter 70 of 747-8 Airplane Maintenance Manual (AMM). — Non-standard torque values for maintenance tasks are included in the applicable installation step.
4. Use the approved fastener and process material substitutions in accordance with SRM Chapter 51. 5. A Detailed Inspection is defined as: An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be necessary. Surface cleaning and elaborate procedures may be required.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 17 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**6. A General Visual Inspection is defined as: A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked. 7. These work instructions refer to procedures included in other Boeing documents. When the words "refer to" are used and the operator has an accepted alternative procedure, the accepted alternative procedure can be used. When the words "in accordance with" are included in the instruction, the procedure in the Boeing document must be used. 8. Boeing Service Letter 747-SL-51-048, Damage Reporting and Repair Plan/Design Guidelines, is an acceptable procedure to request information from Boeing for additional structural repair instructions. The Service Letter describes what information must be provided to Boeing before a structural repair can be provided. 9. The instructions in Paragraph 3.B., Work Instructions and the figures can include operation of tools or test equipment. Boeing Engineering Tool Drawings, the Illustrated Tool and Equipment Manual, and the Special Tool and Ground Handling Drawing Index contain data on versions of the tools or test equipment that you can use. It is permitted to use replaced tools. It is not permitted to use superseded tools. 10. If it is necessary to remove more parts for access, you can remove those parts. If you can get access without removing identified parts, it is not necessary to remove all of the identified parts. Jacking and shoring limitations must be observed. 11. If shading is used, shaded areas in Figures are to separate the non-critical and non-authoritative information from the critical and authoritative information. 12. When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When more than one ACTION is given for a CONDITION number or an OPTION number, do all of the ACTION numbers for that CONDITION number or OPTION number. 13. The compliance times for the actions in Paragraph 3.B., WORK INSTRUCTIONS are in Paragraph 1.E., Compliance. 14. The CONDITIONS, ACTIONS and OPTIONS shown apply to each side independently. 15. Some steps in the Work Instructions are identified as Required for Compliance (RC). If this service bulletin is mandated by an Airworthiness Directive (AD), then the steps identified as RC must be done to comply with the AD. Alternative procedures for steps not identified with RC can be used if the RC steps can still be done as specified, and the airplane can be put back in a serviceable condition. An Alternative Method of Compliance (AMOC) is not necessary for deviations to steps that are not identified as RC.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 18 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT B. WORK INSTRUCTIONS**  **WARNING:** MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL OF THE CONTROL SURFACES BEFORE YOU DO THE PROCEDURE TO REMOVE HYDRAULIC POWER. THE AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT. 1. To release the hydraulic pressure from the left inboard elevator power control actuator (PCA), do these steps: a. Release the pressure from hydraulic system No. 1. Refer to 747-8 AMM 29-11-00, Hydraulic System Depressurization, as an accepted procedure. b. Move the control column in each direction to remove all of the remaining pressure from the PCA. c. Release the pressure from hydraulic system No. 2. Refer to 747-8 AMM 29-11-00, Hydraulic System Depressurization, as an accepted procedure. 2. To release the hydraulic pressure from the right inboard elevator PCA, do these steps: a. Release the pressure from hydraulic system No. 4. Refer to 747-8 AMM 29-11-00, Hydraulic System Depressurization, as an accepted procedure. b. Move the control column in each direction to remove all of the remaining pressure from the PCA. c. Release the pressure from hydraulic system No. 3. Refer to 747-8 AMM 29-11-00, Hydraulic System Depressurization, as an accepted procedure. 3. On the Overhead Maintenance Panel, set all FLT CONTROL HYD POWER TAIL switches to SHUTOFF. Attach a DO-NOT-OPERATE tag to each switch. 4. On the control stand, set the STAB TRIM 2 and 3 switches to CUTOUT. Attach a DO-NOT-OPERATE tag to each switch. 5. Open these circuit breakers and attach DO-NOT-CLOSE tags:
**Name Number**  **Row/Col Panel**  SYS 2 ELEV/RUD VALVE C00652 E7 DC Power Distribution Panel, P180 SYS 4 ELEV/RUD VALVE C00657 E22 SYS 1 ELEV/RUD VALVE C00648 H8 SYS 3 ELEV/RUD VALVE C00654 H23 STAB TRIM S/O-LEFT C08771 E7 Overhead Circuit Breaker Panel, P7 STAB TRIM S/O-RIGHT C08773 E20 6. Open access panels 334HBL, 344HBR, and 315AL. Refer to 747-8 AMM 06-09-05 and 747-8 AMM 06-09-06.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 19 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**7. To prevent elevator linkage movement during the inspections, install rig pin E-2 at the bottom of the elevator aft quadrant. 8. RC - Do PART 1: INBOARD ELEVATOR PCA INSTALLATIONS - DETAILED INSPECTION. 9. RC - Do PART 2: INBOARD ELEVATOR PCA INSTALLATIONS - GENERAL VISUAL INSPECTION. 10. Do the applicable step: **CONDITION 1: BUSHING INSTALLED IN BOTH THE LEFT AND RIGHT PCA INSTALLATIONS AND NO DEFECT OR DAMAGE FOUND DURING GENERAL VISUAL INSPECTION**  a. No more work is necessary. **CONDITION 2: BUSHING NOT INSTALLED IN THE LEFT OR RIGHT PCA INSTALLATION, OR ANY DEFECT OR DAMAGE FOUND DURING GENERAL VISUAL INSPECTION**  a. RC - Contact Boeing for repair instructions and do the repair. 11. Remove rig pin E-2 from the bottom of the elevator aft quadrant. 12. Close access panels 334HBL, 344HBR, and 315AL. Refer to 747-8 AMM 06-09-05 and 747-8 AMM 06-09-06. 13. Remove the DO-NOT-CLOSE tags and close these circuit breakers:
**Name Number**  **Row/Col Panel**  SYS 2 ELEV/RUD VALVE C00652 E7 DC Power Distribution Panel, P180 SYS 4 ELEV/RUD VALVE C00657 E22 SYS 1 ELEV/RUD VALVE C00648 H8 SYS 3 ELEV/RUD VALVE C00654 H23 STAB TRIM S/O-LEFT C08771 E7 Overhead Circuit Breaker Panel, P7 STAB TRIM S/O-RIGHT C08773 E20 14. On the Overhead Maintenance Panel, remove the DO-NOT-OPERATE tags and set all FLT CONTROL HYD POWER TAIL switches to NORM. 15. On the control stand, remove the DO-NOT-OPERATE tags and set the STAB TRIM 2 and 3 switches to ON. 16. Put the airplane back to a serviceable condition.

**PART 1: INBOARD ELEVATOR PCA INSTALLATIONS - DETAILED INSPECTION** 1. Do a detailed inspection of the left PCA installation to find if a bushing is installed, in accordance with FIGURE 1. 2. Do a detailed inspection of the right PCA installation to find if a bushing is installed, in accordance with FIGURE 2.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 20 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT PART 2: INBOARD ELEVATOR PCA INSTALLATIONS - GENERAL VISUAL INSPECTION**  1. Do a general visual inspection of the area between the left horizontal stabilizer rear spar and the elevator front spar, and between STAB STA 235 and 260. Look for defects and damage. 2. Do a general visual inspection of the area between the right horizontal stabilizer rear spar and the elevator front spar, and between STAB STA 235 and 260. Look for defects and damage.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 21 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT FIGURE 1: LEFT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING**  **INSPECTION (SHEET 1 OF 4)** 
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 22 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT FIGURE 1: LEFT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING**  **INSPECTION (SHEET 2 OF 4)** 
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 23 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure.

**FIGURE 1: LEFT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION**  **(SHEET 3 OF 4)**
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 24 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) (b) 1 69B81740-23 Bushing Inspect 1 (a) Do a detailed inspection to find if the bushing is installed. (b) If you cannot clearly see the bushing, use view A-A to find if the bushing is installed.

**FIGURE 1: LEFT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION**  **(SHEET 4 OF 4)**
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 25 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT FIGURE 2: RIGHT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING**  **INSPECTION (SHEET 1 OF 4)** 
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 26 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT FIGURE 2: RIGHT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING**  **INSPECTION (SHEET 2 OF 4)** 
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 27 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure.

**FIGURE 2: RIGHT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION**  **(SHEET 3 OF 4)**
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 28 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT More Data**  **Qty Identification**  **Name Task**  **Step** (a) (b) 1 69B81740-23 Bushing Inspect 1 (a) Do a detailed inspection to find if the bushing is installed. (b) If you cannot clearly see the bushing, use view A-A to find if the bushing is installed.

**FIGURE 2: RIGHT INBOARD ELEVATOR POWER CONTROL ACTUATOR (PCA) INSTALLATION - BUSHING INSPECTION**  **(SHEET 4 OF 4)**
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: August 23, 2013 747-27A2515 29 of 29 **BOEING SERVICE BULLETIN 747-27A2515 ALERT**  **ALERT**