# Boeing Alert Service Bulletin 777-34A0192: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2014-0125; AD 2014-05-05 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 777-34A0192](https://openairdocs.org/service-documents/boeing/777-34a0192.md)
- Title as filed: U.S. DOT/FAA - SB-777-34A0192-00
- Pages: 24
- PDF: https://openairdocs.org/files/sha256/22/5d/225dcbe454c6369989e818e72a63c96011cc82bed0cae670755a0ff4f1fdcb78
- Page: https://openairdocs.org/service-documents/boeing/777-34a0192/file/225dcbe454c6

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

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.
9E991ECCN:
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Unpublished Work.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, Dreamliner™,
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
2.0

### Page 2

Export 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PROPRIETARY - Copyright © Unpublished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
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
Summary ...................................................... 5
1. PLANNING INFORMATION ........................................ 9
A. Effectivity ................................................ 9
1. Airplanes ............................................. 9
2. Spares Affected ........................................ 1 0
B. Concurrent Requirements ...................................... 1 0
C. Reason ................................................ 1 0
D. Description .............................................. 1 1
E. Compliance .............................................. 1 1
F. Approval ............................................... 1 1
G. Manpower .............................................. 1 2
H. Weight and Balance Changes .................................... 1 2
I. Electrical Load Data ......................................... 1 2
J. References .............................................. 1 2
1. Existing Data: ......................................... 1 2
2. Data Supplied with this Service Bulletin: ........................... 1 2
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 1 3
K. Publications Affected ........................................ 1 3
L. Interchangeability and Intermixability of Parts ........................... 1 3
M. Software Accomplishment Summary ................................ 1 3
2. MATERIAL INFORMATION ........................................ 1 5
A. Material - Price and Availability ................................... 1 5
B. Industry Support Information .................................... 1 5
C. Parts Necessary for Each Airplane ................................. 1 5
1. Kits/Parts ............................................ 1 5
2. Parts and Materials Supplied by the Operator ........................ 1 6
3. Parts Modified and Reidentified ................................ 1 6
4. Parts Removed and Not Replaced .............................. 1 6
D. Parts Necessary to Change Spares ................................. 1 6
E. Special Tooling - Price and Availability ............................... 1 6
F. Special Tooling Necessary to do this Service Bulletin ....................... 1 6
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 7
A. GENERAL INFORMATION ..................................... 1 7
B. WORK INSTRUCTIONS ....................................... 1 7
FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT
.................................................. 1 9
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
ALERTALERT

### Page 4

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
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
777
Service Bulletin
ALERT
SummaryNumber: 777-34A0192Original 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 24

### Page 6

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 AffectedYesSpares Affected
Paragraph 1.E., Compliance and Paragraph
1.F., Approval
NoAD 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 AffectedNoAirplane Flight Operations Affected (Flight Crew
Operations Manual and/or FAA Approved Air-
plane Flight Manual)
Paragraph 2.C.1., Kits/PartsYesKits/Parts Required
Paragraph 2.C.2., Parts and Materials Supplied
by the Operator
NoOperator Supplied Material
Paragraph 2.F., Special Tooling Necessary to
do this Service Bulletin
NoSpecial 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 HoursTotal Task HoursAirplanes
6.306.30Group 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
ALERTALERT

### Page 7 (OCR)

BOEING SERVICE BULLETIN 777-34A0192
ALERT  ALERT
Refer to Paragraph 2.A., Material - Price and Availability.
LRRA TRANSMIT
ANTENNAS (LEFT,
CENTER, RIGHT)
(STA 623.5)
REPLACE THE SIX EXISTING
LOW RANGE RADIO ALTIMETER
(LRRA) ANTENNAS WITH NEW
ANTENNAS.
LRRA RECEIVE
ANTENNAS
(LEFT, CENTER, RIGHT)
(STA 665.5)
2189576
Original Issue: December 14, 2012
Export Controlled ECCN: 9E991 - BOEING  777-34A0192
PROPRIETARY - Copyright © Unpublished
Work - See page 1 for details.  7 of 24

### Page 8

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
ALERTALERT
BLANK PAGE

### Page 9

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.
DESCRIPTIONCONFIGURATIONGROUP
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
GroupVariable Number
1WA196 - WA198
1WB101 - WB106
1WB161 - WB177
1WB306 - WB307
1WB631 - 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

### Page 10

GroupVariable Number
1WB646 - WB649
1WC111 - WC120
1WC581
1WC586
1WD046 - WD055
1WD581 - WD599
1WD606 - WD609
1WD621 - WD632
1WD671 - WD677
1WD846 - WD867
1WD921 - WD923
1WE091 - WE093
1WE186 - WE204
1WE261
1WF031 - WF035
1WF131
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
ALERTALERT

### Page 11

– "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
ZoneModel
123, 124, 211, 212777-200, 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
ALERTALERT

### Page 12

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
0.250.251Open Access
2.402.401FIGURE 1
2.402.401FIGURE 2
0.250.251Close Access
1.001.001Test
6.306.30TOTAL 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
ALERTALERT

### Page 13

3. Installation Drawings Used in the Preparation of this Service Bulletin:
TitleDrawing Number
Antenna Installation - Low Range Radio Altimeter284W3034
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-SectionPublication
34-33777 Aircraft Maintenance Manual
Equipment List777 Wiring Diagram Manual
34-33777 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
ALERTALERT

### Page 14

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
ALERTALERT
BLANK PAGE

### Page 15

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)
QTYDateNameKit Number
378.001392012/06/12Top Kit - Low Range Radio
Altimeter Antennas Replace-
ment
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
21Top Kit
11005W3521-1
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
ALERTALERT

### Page 16

ALL
KIT 005W3521-1
Notes
Existing Part
NumberName
Figure
New Part Number
21
Qty
(a)BACB30LH3-6BOLT, 100 DEG
CROSS
44BACB30LH3-6
(a)BACB30LH3-11BOLT, 100 DEG
CROSS
44BACB30LH3-11
(a)BACB30LH3-18BOLT, 100 DEG
CROSS
44BACB30LH3-18
(a) (b)S67-2002-18ANTENNA-RA33S67-2002-28
(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
ALERTALERT

### Page 17

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
ALERTALERT

### Page 18

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
ALERTALERT

### Page 19 (OCR)

BOEING SERVICE BULLETIN 777-34A0192
ALERT  ALERT
LOW RANGE RADIO
ALTIMETER TRANSMIT
ANTENNAS (LEFT,
CENTER, RIGHT)
(STA 623.5)
RBL  LBL
19.00  BL 0.00  MARKER  19.00
STA
623.5
(10)
BOLT  RIGHT  BOLT  CENTER  BOLT 4  BOLT  LEFT  BOLT
ANTENNA  ANTENNA  (LOCATIONS)  ANTENNA
VIEW LOOKING UP
A-A
2189598
FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT
(SHEET 1 OF 3)
Original Issue: December 14, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  777-34A0192
Work - See page 1 for details.  19 of 24

### Page 20 (OCR)

BOEING SERVICE BULLETIN 777-34A0192
ALERT  ALERT
MOISTURE
GUARD TUBE
AND SLEEVE
COAXIAL
CONNECTOR
FAIRING
MOISTURE
SEALANT  AERODYNAMIC  O-RING  GUARD TUBE  AND SLEEVE
B-B
COAXIAL
CONNECTOR
MOISTURE
GUARD TUBE
AND SLEEVE
O-RING  AERODYNAMIC
COAXIAL  C-C  SEALANT
CONNECTOR
* FAIRING
O-RING  SEALANT  AERODYNAMIC  2189663
D-D
FIGURE 1: STA 623.5 - LOW RANGE RADIO ALTIMETER TRANSMIT ANTENNAS - REPLACEMENT
(SHEET 2 OF 3)
Original Issue: December 14, 2012
PROPRIETARY - Copyright ® Unpublished  Export Controlled ECCN: 9E991 - BOEING  777-34A0192
Work - See page 1 for details.  20 of 24

### Page 21

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 DataQtyIdentificationNameTaskStep
(a)1S67-2002-18ANTENNA - RARemove1
2BACB30LH3-18BOLTRemove
2BACB30LH3-11BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)2
2BACB30LH3-18BOLT, 100 DEG
CROSS
Install (New)3
2BACB30LH3-11BOLT, 100 DEG
CROSS
Install (New)4
(a)1S67-2002-18ANTENNA - RARemove5
4BACB30LH3-6BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)6
4BACB30LH3-6BOLT, 100 DEG
CROSS
Install (New)
(a)1S67-2002-18ANTENNA - RARemove7
2BACB30LH3-18BOLTRemove
2BACB30LH3-11BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)8
2BACB30LH3-18BOLT, 100 DEG
CROSS
Install (New)9
2BACB30LH3-11BOLT, 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
ALERTALERT

### Page 22 (OCR)

BOEING SERVICE BULLETIN 777-34A0192
ALERT  ALERT
LOW RANGE RADIO
ALTIMETER RECEIVE
ANTENNAS (LEFT,
CENTER, RIGHT)
(STA 665.5)
RBL  LBL
19.00  BL 0.00  MARKER  19.00
D
STA
665.5
BOLT  RIGHT  BOLT  CENTER  BOLT 4  BOLT  LEFT  BOLT
ANTENNA  ANTENNA  (LOCATIONS)  ANTENNA
VIEW LOOKING UP
A-A
2189689
FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT
(SHEET 1 OF 3)
Original Issue: December 14, 2012
Export Controlled ECCN: 9E991 - BOEING  PROPRIETARY - Copyright © Unpublished  777-34A0192
Work - See page 1 for details.  22 of 24

### Page 23 (OCR)

BOEING SERVICE BULLETIN 777-34A0192
ALERT  ALERT
MOISTURE
GUARD TUBE
AND SLEEVE
COAXIAL
CONNECTOR
FAIRING
MOISTURE
AERODYNAMIC  O-RING  GUARD TUBE
SEALANT  AND SLEEVE
B-B
COAXIAL
CONNECTOR
MOISTURE
GUARD TUBE
AND SLEEVE
O-RING  AERODYNAMIC
COAXIAL  CONNECTOR  C-C  SEALANT
* FAIRING
O-RING  AERODYNAMIC
D-D  SEALANT  2189690
FIGURE 2: STA 665.5 - LOW RANGE RADIO ALTIMETER RECEIVE ANTENNAS - REPLACEMENT
(SHEET 2 OF 3)
Original Issue: December 14, 2012
PROPRIETARY - Copyright © Unpublished  Export Controlled ECCN: 9E991 - BOEING  777-34A0192
Work - See page 1 for details.  23 of 24

### Page 24

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 DataQtyIdentificationNameTaskStep
(a)1S67-2002-18ANTENNA - RARemove1
2BACB30LH3-18BOLTRemove
2BACB30LH3-11BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)2
2BACB30LH3-18BOLT, 100 DEG
CROSS
Install (New)3
2BACB30LH3-11BOLT, 100 DEG
CROSS
Install (New)4
(a)1S67-2002-18ANTENNA - RARemove5
4BACB30LH3-6BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)6
4BACB30LH3-6BOLT, 100 DEG
CROSS
Install (New)
(a)1S67-2002-18ANTENNA - RARemove7
2BACB30LH3-18BOLTRemove
2BACB30LH3-11BOLTRemove
(a)1S67-2002-28ANTENNA-RAInstall (New)8
2BACB30LH3-18BOLT, 100 DEG
CROSS
Install (New)9
2BACB30LH3-11BOLT, 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
ALERTALERT

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.