Commercial 

Airplanes 777

Service Bulletin

ALERT

Number: 777-34A0191

Original Issue: September 20, 2011

Revision 1: March 23, 2012

ATA System: 3433

SUBJECT: NAVIGATION - Radio Altimeter System - Radio Altimeter Transceiver Replacement

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

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ECCN: 9E991

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BLANK PAGE
Table of Contents

Revision Transmittal Sheet ............................................ 5

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1. Existing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. Data supplied with this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. Installation Drawings Used in the Preparation of this Service Bulletin . . . . . . . . . . . . 14

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 17

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 18

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

FIGURE 1: RADIO ALTIMETER TRANSCEIVER REPLACEMENT . . . . . . . . . . . . . . . . . . . 20

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Commercial 

Airplanes 777

Service Bulletin

ALERT

Revision Transmittal Sheet Number: 777-34A0191

Original Issue: September 20, 2011

Revision 1: March 23, 2012

ATA System: 3433

SUBJECT: NAVIGATION - Radio Altimeter System - Radio Altimeter Transceiver Replacement

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

No more work is necessary on the airplanes changed in accordance with the original issue of this service bulletin.

REASON FOR REVISION

This revision is sent to add one airplane to the effectivity list of the original issue of this service bulletin.

These sections were changed:

1. In PLANNING INFORMATION, Paragraph 1.A.1., airplane WE091 was added to the effectivities.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location

of important changes.

Pages with no vertical lines have no important changes.

REVISION HISTORY

Original Issue: September 20, 2011

Revision 1: March 23, 2012

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ALERT ALERT

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Commercial 

Airplanes 777

Service Bulletin

ALERT

Summary Number: 777-34A0191

Original Issue: September 20, 2011

Revision 1: March 23, 2012

ATA System: 3433

SUBJECT: NAVIGATION - Radio Altimeter System - Radio Altimeter Transceiver 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 existing Radio Altimeter (RA) Transceivers with the upgraded

units. The upgraded Radio Altimeter Transceivers have improved antenna monitoring capabilities for detecting

antenna deterioration caused by the environmental conditions or damage to the antenna during antenna alteration

which can result in breaks in the coaxial cables or damage to the coax connector. If the changes in this service

bulletin are not done, incorrect Radio Altimeter output may be observed on the Primary Flight Displays (PFD).

Some operators have reported inconsistent Radio Altimeter Transceiver outputs during the flight and on the

ground. The antenna alteration at the antenna level can create micro cracks on the electrical grounding connection,

damage the coax cables or the coax connector center pin contact. Any one of these damages to the antenna

assembly can affect the Radio Altimeter system functionality.

Boeing Service Related Problem 777-SRP-34-0120 is related to this service bulletin.

Boeing Fleet Team Digest 777 FTD 34-10013 is related to this service bulletin.

This table is provided to operators for planning purposes only. Refer to the applicable sections for more

information.

Planning Data Affected Reference

Spares Affected Yes Paragraph 1.A.2., Spares Affected

AD Related No Paragraph 1.E., Compliance

Weight and Balance Change No Paragraph 1.H., Weight and Balance Changes

Electrical Load Changed No Paragraph 1.I., Electrical Load Data

Publications Affected Yes Paragraph 1.K., Publications Affected

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Planning Data Affected Reference

Airplane Flight Operations Affected (Flight Crew No Paragraph 1.K., Publications Affected

Operations Manual and/or FAA Approved Airplane Flight Manual)

Kits/Parts Required No Paragraph 2.C.1., Kits/Parts

Paragraph 2.C.2., Parts and Materials Supplied

by the Operator

Operator Supplied Material Yes

Paragraph 2.F., Special Tooling Necessary to

do this Service Bulletin

Special Tooling Required No

ACTION (PRR 62777-85S)

1. Gain access to the E5 rack in the forward cargo compartment.

2. Replace the Radio Altimeter (RA) Transceivers.

3. Do Installation Test.

EFFECTIVITY

777-200, 777-200LR, 777-300, 777-300ER, and 777F Airplane(s). Refer to Paragraph 1.A.1., Airplanes, for the

list of affected airplane(s).

COMPLIANCE

Boeing recommends that the changes given in this service bulletin be done within 24 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

Airplanes Total Task Hours Elapsed Hours

All 1.65 1.65

MATERIAL INFORMATION

Operator Supplied Parts/Materials.

Refer to Paragraph 2.A., Material - Price and Availability.

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Commercial 

Airplanes 777

Service Bulletin

ALERT

Number: 777-34A0191

Original Issue: September 20, 2011

Revision 1: March 23, 2012

ATA System: 3433

SUBJECT: NAVIGATION - Radio Altimeter System - Radio Altimeter Transceiver 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

This service bulletin is for the airplane(s) shown below. Refer to PRR 62777-85S for data about

this change.

Refer to Service Bulletin Index D624W001 Part 3 for Airplane Variable Number, Line Number, and

Serial Number data.

GROUP CONFIGURATION DESCRIPTION

Replace existing Radio Altimeter Transceivers with 9599-607-19996

part number

1 -

Airplane Models:

777-200, 777-200LR, 777-300, 777-300ER, 777F

Variable Number Group

WA196 - WA198 1

WB101 - WB106 1

WB161 - WB177 1

WB306 - WB307 1

WB631 - WB638 1

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Variable Number Group

WB646 - WB649 1

WC111 - WC120 1

WC581 1

WD046 - WD055 1

WD581 - WD599 1

WD606 - WD609 1

WD621 - WD632 1

WD671 - WD677 1

WD846 - WD862 1

WD921 - WD922 1

WE091 1

WF031 - WF032 1

WF131 1

2. Spares Affected

Examine your spares supply for the parts or components identified in Paragraph 2.C., Parts

Necessary for Each Airplane. If any parts or components are found, refer to Paragraph 2.C. for

the recommended use.

B. Concurrent Requirements

None.

C. Reason

This service bulletin gives instructions to replace the existing Radio Altimeter (RA) Transceivers with

the upgraded units. The upgraded Radio Altimeter Transceivers have improved antenna monitoring

capabilities for detecting antenna deterioration caused by the environmental conditions or damage to

the antenna during antenna alteration which can result in breaks in the coaxial cables or damage to

the coax connector. If the changes in this service bulletin are not done, incorrect Radio Altimeter output

may be observed on the Primary Flight Displays (PFD).

Some operators have reported inconsistent Radio Altimeter Transceiver outputs during the flight and

on the ground. The antenna alteration at the antenna level can create micro cracks on the electrical

grounding connection, damage the coax cables or the coax connector center pin contact. Any one of

these damages to the antenna assembly can affect the Radio Altimeter system functionality.

Boeing Service Related Problem 777-SRP-34-0120 is related to this service bulletin.

Boeing Fleet Team Digest 777 FTD 34-10013 is relate to this service bulletin.

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BOEING SERVICE BULLETIN 777-34A0191

ALERT ALERT
Revision 1 is sent to add WE091 to the effectivity list of the airplanes in the original issue of this service

bulletin.

D. Description

1. Gain access to the E5 rack in the forward cargo compartment.

2. Replace the Radio Altimeter (RA) Transceivers.

3. Do Installation Test.

Revision 1 - No more work is necessary on airplanes changed in accordance with the original issue of

this service bulletin.

The work in this service bulletin is done in the maintenance zone(s) given below.

Affected Maintenance Zones

Model Zone

777-200, 777-200LR, 777-300, 122, 211, 212

777-300ER, 777F

E. Compliance

Boeing recommends that the changes given in this service bulletin be done within 24 months after the

original issue date of this service bulletin.

F. Approval

This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified

in this service bulletin comply with the applicable regulations and are FAA approved, as well as European

Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved

airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on

the airplane in its original Boeing delivery configuration or as modified by other approved Boeing

changes.

If an airplane has a non-Boeing modification or repair that affects a component or system also affected

by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval

before incorporating this service bulletin.

G. Manpower

The table below shows an estimate of the task hours necessary to do this change for each airplane.

This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator

task hour data if necessary. The estimate does not include lost time. These are some examples of lost

time:

• Time to adjust to the workplace

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ALERT ALERT
• 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.

Task Number of Persons Task Hours Elapsed Hours

Open Access 1 0.25 0.25

Figure 1 1 0.90 0.90

RA Installation tests 1 0.25 0.25

Close Access 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 1.65 1.65

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. Service Related Problem (SRP) 777-SRP-34-0120

c. Fleet Team Digest (FTD) 777 FTD 34-10013

d. 777 Maintenance Manual (AMM) Subject 777 AMM 34-33-01

e. THALES SB ERT-550-34-04

2. Data supplied with this Service Bulletin

None.

3. Installation Drawings Used in the Preparation of this Service Bulletin

Drawing Number Title

284W1205 EQUIPMENT INSTL - E5 RACK

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BOEING SERVICE BULLETIN 777-34A0191

ALERT ALERT
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:

Publication Chapter-Section

777 Aircraft Maintenance Manual 34-33

777 Wiring Diagram Manual EQUIPMENT LIST

777 Illustrated Parts Catalog 34-33, 25-17

Component Maintenance Manual 34-32

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.

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ALERT ALERT

BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each

Airplane . Refer to THALES SB ERT-550-34-04 for price and upgrade kit availability.

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

None.

2. Parts and Materials Supplied by the Operator

Part Number / QTY Name Existing Part Number Notes

Specification

9599-607-19991 or 9599- (a) (b) (c)

607-19992 or 9599-607-

19993

9599-607-19996 3 Radio Altimeter Transceiver

(a) The existing/installed Radio Altimeter Transceivers have one of the part numbers mentioned in the

"Existing Part Number" column.

(b) You can use the existing Radio Altimeter Transceivers to upgrade to 9599-607-19996 part number.

Refer to THALES SB ERT-550-34-04 for the information on how to upgrade the existing Radio Altimeter

Transceivers to 9599-607-19996 part number.

(c) 9599-607-19991 and 9599-607-19992 units must first be converted to 9599-607-19993 part number

before they can be upgraded to 9599-607-19996 part number. Refer to the "Concurrent Requirements"

section of THALES SB ERT-550-34-04 for this information.

3. Parts Modified and Reidentified

None.

4. Parts Removed and Not Replaced

None

D. Parts Necessary to Change Spares

To get the parts shown below, refer to Paragraph 2.A., Material - Price and Availability.

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BOEING SERVICE BULLETIN 777-34A0191

ALERT ALERT
Part Number Name QTY

Radio Altimeter -

Transceiver

9599-607-19996

(a)

(a) Refer to THALES SB ERT-550-34-04 for the

information on how to upgrade the existing

RAs to 9599-607-19996 part number.

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.

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BOEING SERVICE BULLETIN 777-34A0191

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. 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.

B. WORK INSTRUCTIONS

1. Get access to Electronic Equipment Rack E5 in the Forward Cargo Compartment.

2. Replace the Radio Altimeter (RA) Transceivers in accordance with FIGURE 1.

3. Do installation test. Refer to 777 AMM 34-33-01 as an accepted procedure.

4. Put the airplane back to a serviceable condition.

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ALERT ALERT
FIGURE 1: RADIO ALTIMETER TRANSCEIVER REPLACEMENT

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 777-34A0191

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.

Step Task Name Identification Qty More Data

9599-607-19991 OR 3 (a)

9599-607-19992 OR

9599-607-19993

RADIO ALTIMETER

TRANSCEIVER

1 Remove

RADIO ALTIMETER 9599-607-19996 3 (b)

TRANSCEIVER

2 Install (Changed)

(a) Refer to 777 AMM 34-33-01 as an accepted procedure. The existing/installed Radio Altimeter Transceivers

have one of the following 9599-607-19991, 9599-607-19992 or 9599-607-19993 part numbers.

(b) Refer to 777 AMM 34-33-01 as an accepted procedure.

FIGURE 1: RADIO ALTIMETER TRANSCEIVER REPLACEMENT

(SHEET 2 OF 2)

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