### Commercial **Airplanes** 

# 777 Service Bulletin **ALERT Number: 777-34A0192**  Original Issue: December 14, 2012 ATA System: 3433 **SUBJECT:** NAVIGATION - Radio Altimeter System - Low Range Radio Altimeter Antenna Replacement 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 © 2012 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 Unpublished Work.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, DreamlinerTM, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, 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. BOEING is a trademark of Boeing Management Company.

Original Issue: December 14, 2012 777-34A0192 1 of 24 2.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 2 of 24 **BOEING SERVICE BULLETIN 777-34A0192 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 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:. . . . . . . . . . . . . . . . . . . . . . . . . . . 12 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. . . . . . . . . . . . . . . . . . . . . . . . 16 3. Parts Modified and Reidentified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 16 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT . 22

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 3 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 4 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 777 Service Bulletin **ALERT Summary**  **Number: 777-34A0192** Original Issue: December 14, 2012 ATA System: 3433 **SUBJECT:** NAVIGATION - Radio Altimeter System - Low Range Radio Altimeter Antenna Replacement 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 replace the six existing Low Range Radio Altimeter (LRRA) antennas with new improved antennas for airplanes equipped with Thales Radio Altimeter Transceivers. If this service bulletin is not done, the radio altimeter data reported by the LRRA antennas may not meet the predicted reliability and data integrity requirements, which can result in unsafe flight condition. Operators have reported erratic LRRA operation while the airplane is airborne even though operation is normal when the airplane is on the ground. The LRRA events were intermittent and have not been duplicated on the ground. The symptoms can include the following: – Large differences between captain's and first officer's radio altitudes or a negative altitude in air – "NO LAND 3" or "NO AUTOLAND" Engine Indication and Crew Alerting System (EICAS) message – Autopilot disconnect, inability to engage Autopilot, or Flight Directors bias-out-of view – Autothrottle disconnect, Autothrottle retard, or inability to engage Autothrottle into SPD (Speed) mode – Unexpected Configuration Warnings after takeoff, during approach, or during go-around – Missing or inappropriate aural height callouts – Unavailability of auto speedbrake via "AUTO SPEEDBRAKE" EICAS message – Nuisance or missing Ground Proximity Warning System (GPWS) warnings – Electronic Engine Control (EEC) indicating ground mode and engine going to ground idle – Inability to engage Lateral Navigation (LNAV) Accomplishment of this service bulletin will improve the reliability of the radio altimeter data reported by the LRRA system. Boeing Service Related Problem (SRP) 777-SRP-34-0120 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 777 FTD 34-10013 is related to this service bulletin.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 5 of 24This 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 Yes Spares Affected Paragraph 1.E., Compliance and Paragraph 1.F., Approval No 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 Yes 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 Yes Kits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator No Operator Supplied Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin No Special Tooling Required

**ACTION (PRR 62777-85S)** Get access to the area below the forward cargo compartment. At STA 623.5 and STA 665.5, replace the six existing LRRA antennas with new antennas. Do the system test of the Radio Altimeter System. **EFFECTIVITY** 777-200/200LR/300/300ER, 777F Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s). **COMPLIANCE** Boeing recommends that the change given in this service bulletin be done within 36 months after the original issue date of this service bulletin. **INDUSTRY SUPPORT INFORMATION** Boeing warranty remedies are not available for the configuration changes given in this service bulletin. **MANPOWER Elapsed Hours**  **Total Task Hours Airplanes**  6.30 6.30 Group 1
**MATERIAL INFORMATION** Boeing Supplied Kits/Parts.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 6 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**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: December 14, 2012 777-34A0192 7 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 8 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**

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### Commercial **Airplanes** 

# 777 Service Bulletin **ALERT Number: 777-34A0192**  Original Issue: December 14, 2012 ATA System: 3433 **SUBJECT:** NAVIGATION - Radio Altimeter System - Low Range Radio Altimeter Antenna Replacement 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 D624W001 Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplane(s) shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 62777-85S for data about this change.
**DESCRIPTION CONFIGURATION**  **GROUP** Airplanes equipped with Thales Radio Altimeter Transceivers and with the LRRA antennas part number S67-2002-18 installed. - 1

Airplane Models: 777-200, 777-200LR, 777-300, 777-300ER, 777F **Group Variable Number**  1 WA196 - WA198 1 WB101 - WB106 1 WB161 - WB177 1 WB306 - WB307 1 WB631 - WB638

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 9 of 24**Group Variable Number**  1 WB646 - WB649 1 WC111 - WC120 1 WC581 1 WC586 1 WD046 - WD055 1 WD581 - WD599 1 WD606 - WD609 1 WD621 - WD632 1 WD671 - WD677 1 WD846 - WD867 1 WD921 - WD923 1 WE091 - WE093 1 WE186 - WE204 1 WE261 1 WF031 - WF035 1 WF131 2. Spares Affected Examine your spares supply for the parts or components identified below. If any parts or components are found, refer to Paragraph 2.C.1., Kits/Parts for the recommended action.
**Part Number** S67-2002-18 **B. Concurrent Requirements** None. **C. Reason** This service bulletin gives instructions to replace the six existing Low Range Radio Altimeter (LRRA) antennas with new improved antennas for airplanes equipped with Thales Radio Altimeter Transceivers. If this service bulletin is not done, the radio altimeter data reported by the LRRA antennas may not meet the predicted reliability and data integrity requirements, which can result in unsafe flight condition. Operators have reported erratic LRRA operation while the airplane is airborne even though operation is normal when the airplane is on the ground. The LRRA events were intermittent and have not been duplicated on the ground. The symptoms can include the following: – Large differences between captain's and first officer's radio altitudes or a negative altitude in air

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 10 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**– "NO LAND 3" or "NO AUTOLAND" Engine Indication and Crew Alerting System (EICAS) message – Autopilot disconnect, inability to engage Autopilot, or Flight Directors bias-out-of view – Autothrottle disconnect, Autothrottle retard, or inability to engage Autothrottle into SPD (Speed) mode – Unexpected Configuration Warnings after takeoff, during approach, or during go-around – Missing or inappropriate aural height callouts – Unavailability of auto speedbrake via "AUTO SPEEDBRAKE" EICAS message – Nuisance or missing Ground Proximity Warning System (GPWS) warnings – Electronic Engine Control (EEC) indicating ground mode and engine going to ground idle – Inability to engage Lateral Navigation (LNAV) Accomplishment of this service bulletin will improve the reliability of the radio altimeter data reported by the LRRA system. Boeing Service Related Problem (SRP) 777-SRP-34-0120 is related to this service bulletin. Boeing Fleet Team Digest (FTD) 777 FTD 34-10013 is related to this service bulletin. **D. Description** Get access to the area below the forward cargo compartment. At STA 623.5 and STA 665.5, replace the six existing LRRA antennas with new antennas. Do the system test of the Radio Altimeter System. The work in this service bulletin is done in the maintenance zone(s) given below.
**Affected Maintenance Zones Zone**  **Model** 123, 124, 211, 212 777-200, 777-200LR, 777-300, 777-300ER, 777F **E. Compliance** Boeing recommends that the change given in this service bulletin be done within 36 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.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 11 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT 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 Hours Task Hours**  **Number of Persons Task**  0.25 0.25 1 Open Access 2.40 2.40 1 FIGURE 1 2.40 2.40 1 FIGURE 2 0.25 0.25 1 Close Access 1.00 1.00 1 Test 6.30 6.30 TOTAL FOR EACH AIRPLANE **H. Weight and Balance Changes** None. **I. Electrical Load Data** Not changed. **J. References** 1. Existing Data: a. Engineering Change Memo PRR 62777-85S b. Boeing Service Related Problem (SRP) 777-SRP-34-0120 c. Service Bulletin Index D624W001 d. 777 Aircraft Maintenance Manual (AMM) 34-33-00, 34-33-02 e. 777 Fleet Team Digest (FTD) 34-10013 2. Data Supplied with this Service Bulletin: None.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 12 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**3. Installation Drawings Used in the Preparation of this Service Bulletin:
**Title Drawing Number**  Antenna Installation - Low Range Radio Altimeter 284W3034 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: **Chapter-Section**

**Publication** 34-33 777 Aircraft Maintenance Manual Equipment List 777 Wiring Diagram Manual 34-33 777 Illustrated Parts Catalog 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** Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability information. **M. Software Accomplishment Summary** Not affected.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 13 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 14 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**

BLANK PAGE**2. MATERIAL INFORMATION A. Material - Price and Availability**  Boeing can supply the kits shown in Paragraph 2.C., Parts Necessary for Each Airplane. Operators are encouraged to share schedule requirements with Boeing for incorporation of the service bulletin. The kits are subject to the terms and conditions of the Boeing standard purchase order acknowledgment. Prices are in United States Dollars. Terms: Net 30 days. Reference this service bulletin and submit your purchase order by one of these methods: 1. Order on-line via ATA Spec 2000 or The Boeing PART Page 2. Fax to (206) 662-7145 **REFER TO THE BOEING PART PAGE ON MYBOEINGFLEET.COM OR CONTACT FIRST RESPONDER AT FR@BOEING.COM FOR THE LATEST REORDER LEAD TIME (ROLT) AND PRICE INFORMATION** 
**Unit Price as of the original issue** **date of this Ser vice Bulletin (US**  **Dollars) ROLT as of the**  **original issue date of this Ser** **vice Bulletin (Cal endar Days)**  **QTY Date**  **Name Kit Number** 

378.00 139 20 12/06/12 Top Kit - Low Range RadioAltimeter Antennas Replacement 005W3521-1

**B. Industry Support Information** Boeing warranty remedies are not available for the configuration changes given in this service bulletin. **C. Parts Necessary for Each Airplane** 1. Kits/Parts To get the kits/parts shown below, refer to Paragraph 2.A., Material - Price and Availability. **NOTE:** One top kit and the items shown in Paragraph 2.C.2., Parts and Materials Supplied by the Operator, are necessary for each airplane. The Top Kit is divided into Figure kits for each installation figure shown in the table below. **Figure Kit 2**  **1 Top Kit**  1 1 005W3521-1

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 15 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT ALL** 
**KIT 005W3521-1**

**Notes Existing Part**  **Number Name**  **Figure**

**New Part Number 2**  **1 Qty**  (a) BACB30LH3-6 BOLT, 100 DEG CROSS 4 4 BACB30LH3-6 (a) BACB30LH3-11 BOLT, 100 DEG CROSS 4 4 BACB30LH3-11 (a) BACB30LH3-18 BOLT, 100 DEG CROSS 4 4 BACB30LH3-18 (a) (b) S67-2002-18 ANTENNA-RA 3 3 S67-2002-28 (a) Discard the existing part. (b) This part is used in production. 2. Parts and Materials Supplied by the Operator No special parts or materials are necessary to do the change in this service bulletin. But, parts and materials in the manuals given in Paragraph 1.J., References, can be necessary. Examine operator part and material supply to make sure all necessary parts and materials are available. 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: December 14, 2012 777-34A0192 16 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT 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. Use the approved fastener and process material substitutions in accordance with SRM Chapter 51. 4. If the length of any fastener specified in this service bulletin does not meet installation standards given in SRM Chapter 51, then a fastener of the same specification, or an approved substitute, with a length which meets the installation standards given in SRM Chapter 51 may be used. In addition, washers may be installed for fastener grip length in accordance with SRM Chapter 51. 5. 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. 6. 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. 7. 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. 8. Where the work instructions include installation of a kept part, a new or serviceable part with the same part number can be installed as an alternative to the kept part. 9. This service bulletin includes functional test procedures for the systems changed by this service bulletin. More functional tests can possibly be necessary in accordance with standard maintenance practices because of interruption to other airplane systems. **B. WORK INSTRUCTIONS** 1. Get access to the area below the forward cargo compartment. 2. At STA 623.5, replace the existing left, right and center Low Range Radio Altimeter (LRRA) transmit antennas with new antennas in accordance with FIGURE 1.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 17 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**3. At STA 665.5, replace the existing left, right and center LRRA receive antennas with new antennas in accordance with FIGURE 2. 4. Do the system test of the Radio Altimeter System. Refer to 777 AMM 34-33-00 as an accepted procedure. 5. Put the airplane back to a serviceable condition.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 18 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 19 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 20 of 24 **BOEING SERVICE BULLETIN 777-34A0192 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.
**More Data Qty**  **Identification Name**  **Task Step**  (a) 1 S67-2002-18 ANTENNA - RA Remove 1 2 BACB30LH3-18 BOLT Remove 2 BACB30LH3-11 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 2 2 BACB30LH3-18 BOLT, 100 DEG CROSS Install (New) 3

2 BACB30LH3-11 BOLT, 100 DEG CROSS Install (New) 4 (a) 1 S67-2002-18 ANTENNA - RA Remove 5 4 BACB30LH3-6 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 6 4 BACB30LH3-6 BOLT, 100 DEG CROSS Install (New) (a) 1 S67-2002-18 ANTENNA - RA Remove 7 2 BACB30LH3-18 BOLT Remove 2 BACB30LH3-11 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 8 2 BACB30LH3-18 BOLT, 100 DEG CROSS Install (New) 9

2 BACB30LH3-11 BOLT, 100 DEG CROSS Install (New) 10 (a) Refer to 777 AMM 34-33-02 as an accepted procedure.

**FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT (SHEET 3 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 21 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT**  **(SHEET 1 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 22 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT**  **(SHEET 2 OF 3)** Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 23 of 24 **BOEING SERVICE BULLETIN 777-34A0192 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.
**More Data Qty**  **Identification Name**  **Task Step**  (a) 1 S67-2002-18 ANTENNA - RA Remove 1 2 BACB30LH3-18 BOLT Remove 2 BACB30LH3-11 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 2 2 BACB30LH3-18 BOLT, 100 DEG CROSS Install (New) 3

2 BACB30LH3-11 BOLT, 100 DEG CROSS Install (New) 4 (a) 1 S67-2002-18 ANTENNA - RA Remove 5 4 BACB30LH3-6 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 6 4 BACB30LH3-6 BOLT, 100 DEG CROSS Install (New) (a) 1 S67-2002-18 ANTENNA - RA Remove 7 2 BACB30LH3-18 BOLT Remove 2 BACB30LH3-11 BOLT Remove (a) 1 S67-2002-28 ANTENNA-RA Install (New) 8 2 BACB30LH3-18 BOLT, 100 DEG CROSS Install (New) 9

2 BACB30LH3-11 BOLT, 100 DEG CROSS Install (New) 10 (a) Refer to 777 AMM 34-33-02 as an accepted procedure.

**FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT (SHEET 3 OF 3)**  Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: December 14, 2012 777-34A0192 24 of 24 **BOEING SERVICE BULLETIN 777-34A0192 ALERT**  **ALERT**