Commercial

Airplane

Group

777

Service Bulletin

Number: 777-23-0057 Summary Date: April 9, 1998

ATA System: 2339

SUBJECT: COMMUNICATIONS - PASSENGER ADDRESS AND ENTERTAINMENT - CABIN

MANAGEMENT SYSTEM - CABIN SYSTEM CONTROL PANEL WIRE CHANGE

BACKGROUND

This service bulletin gives instructions to correct a

connection between cabin system control panel

(CSCP) and cabin management terminal (CMT) and

to enable CSCP to print to the cabin printer.

It was found that two wires were connected

incorrectly at the CMT which prevented the CSCP

from printing to the cabin printer.

ACTION

In the purser station, change the termination of two

wires at CMT. Do a CMT operational test.

COMPLIANCE

No compliance time is given.

EFFECTIVITY

Operator Airplanes

SIA WB181 - WB184

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are available for

airplanes in warranty as of December 1, 1997.

Please refer to Paragraph I.F., Industry Support

Information.

MANPOWER

Total

Man-hours

Elapsed Time

(Hours)

1.75 1.75

MATERIAL INFORMATION

None

BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE, WASHINGTON 98124-2207 Summary Page 1 of 2
BOEING SERVICE BULLETIN 777-23-0057

FWD

OF TWO WIRES AT THE

CABIN CONTROL PANEL CABIN MANAGEMENT TERMINAL

CHANGE THE TERMINATION

MAIN ENTRY DOOR 2L

PURSER STATION

S40010

Apr 9/98

Summary Page 2 of 2
Commercial

Airplane

Group

777

Service Bulletin

Number: 777-23-0057

Date: April 9, 1998

ATA System: 2339

SUBJECT: COMMUNICATIONS - PASSENGER ADDRESS AND ENTERTAINMENT - CABIN

MANAGEMENT SYSTEM - CABIN SYSTEM CONTROL PANEL WIRE CHANGE

I. PLANNING INFORMATION

A. Effectivity

1. Airplanes

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

Number, and Serial Number data.

This service bulletin is for the airplanes shown below.

IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER

SINGAPORE AIRLINES (SIA)

WB181-WB184

IDENTIFICATION BY VARIABLE NUMBER

WB181-WB184

2. Spares

None

Apr 9/98 777-23-0057

Page 1 of 9
BOEING SERVICE BULLETIN 777-23-0057

B. Reason

This service bulletin gives instructions to correct a connection between cabin system control panel

(CSCP) and cabin management terminal (CMT) and to enable CSCP to print to the cabin printer.

It was found that two wires were connected incorrectly at the CMT which prevented the CSCP from

printing to the cabin printer.

C. Description

In the purser station, change the termination of two wires at CMT. Do a CMT operational test.

An evaluation form is attached to this service bulletin. Please use this form to tell us what you think

of the quality of this service bulletin.

D. Compliance

No compliance time is given.

E. Approval

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

specified in this service bulletin comply with the applicable Federal Aviation Regulations (FAR) and

are FAA approved. The changes specified in this service bulletin also comply with the applicable

Joint Airworthiness Requirements (JAR) and are FAA approved as delegated by the Joint Aviation

Authorities (JAA). This service bulletin and the FAA approval were based on the airplane in its

original Boeing delivery configuration or as modified by other FAA approved Boeing changes.

NOTE: Interior arrangements are not evaluated for JAR compliance.

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.

F. Industry Support Information

Boeing warranty remedies are available for 777 airplanes in warranty as of December 1, 1997. For

man-hour and material reimbursement for airplanes in warranty as of that date, send a warranty claim

to Boeing Product Assurance Contracts.

Apr 9/98 777-23-0057

2
BOEING SERVICE BULLETIN 777-23-0057

G. Manpower

The table below shows an estimate of the man-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

man-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 examine the work

- Time to cure the materials

- Time to make the parts

- Time to find the tools.

Task Number of Persons Man-Hours Elapsed Time (Hours)

Open Access 1 0.25 0.25

Change 1 1.00 1.00

Close Access 1 0.25 0.25

Test 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 1.75 1.75

H. Material - Price and Availability

None

I. Special Tools - Price and Availability

None

J. Weight and Balance Changes

None

Apr 9/98 777-23-0057

3
BOEING SERVICE BULLETIN 777-23-0057

K. References

1. Existing Data:

a. 777 Maintenance Manual (AMM) Subject 23-36-00

b. 777 Wiring Diagram 23-36-41

c. Boeing Standard Wiring Practices Manual (BSWPM) 20-10-11 and 20-10-12

2. Data supplied with this service bulletin:

None

3. Installation Drawings:

None

L. Publications Changed

Publication Chapter-Section

777 Wiring Diagram Manual 23-36

M. Electrical Load Data

Not changed

Apr 9/98 777-23-0057

4
BOEING SERVICE BULLETIN 777-23-0057

II. MATERIAL INFORMATION

A. Parts Necessary For Each Airplane

None

B. Parts Necessary to Change Spares

None

C. Special Tools and Equipment

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 I.K., References, can be

necessary. Examine operator tool supply to make sure all necessary tools are available.

D. Existing Parts Accountability

None

Apr 9/98 777-23-0057

5
BOEING SERVICE BULLETIN 777-23-0057

BLANK PAGE

Apr 9/98 777-23-0057

6
BOEING SERVICE BULLETIN 777-23-0057

III. ACCOMPLISHMENT INSTRUCTIONS

NOTE:

1. The paragraphs identified with a letter give the general work instructions and the necessary tests.

2. The work instructions are divided into work packages. Man-hours and elapsed time for each

3. Refer to the Boeing Standard Wiring Practices Manuals 20-10-11 and 20-10-12 for the wire

installation procedures.

4. Obey all of the warnings and cautions given in the specified manual sections.

A. In the passenger compartment, gain access to the cabin management terminal (CMT).

B. Change the termination of one wire at CMT as shown in Figure 1.

C. Do a CMT operational test as given in 777 AMM 23-36-00.

D. Put the airplane back in serviceable condition.

Apr 9/98 777-23-0057

7
BOEING SERVICE BULLETIN 777-23-0057

DELETED WIRE OR FORMER ROUTING

EXISTING WIRE

ADDED WIRE OR NEW ROUTING

DM23555B

RX

35 TX

TX 40 W6943-409RK-22 13

RX 39 W6943-409R-22 32 RX

DM23673D (J4)

14 DTR

SIG GND

M23673 CMT

W6943-409B-22

W6943-409BK-22

43

42

M23555 CABIN

CONTROL PANEL

DSR

SIG GND

PURSER STATION

APPLICABLE TO AIRPLANE WB184

REFERENCE: 777 WIRING DIAGRAM 23-61-41

S40068

FIGURE 1. CABIN MANAGEMENT TERMINAL WIRE CHANGE

Apr 9/98 SHEET 1 OF 2 777-23-0057

8
BOEING SERVICE BULLETIN 777-23-0057

DELETED WIRE OR FORMER ROUTING

EXISTING WIRE

ADDED WIRE OR NEW ROUTING

1

RX

TX

RX 39

TX 40

35

W6943-409RK-22 13

W6943-409R-22 32 RX

REFERENCE: 777 WIRING DIAGRAM 23-61-41

PURSER STATION

SIG GND

DSR

42

43

W6943-409BK-22

W6943-409B-22

M23673 CMT

SIG GND

DTR 14

DM23673D (J4)

M23066 CABIN

CONTROL PANEL

(PROVISIONAL)

DM23066A

APPLICABLE TO AIRPLANES WB181-WB183

S40095

The flag note number shown below agrees with the number shown in the flag symbol in the figure.

FLAG

NOTE NAME PART NUMBER QTY NOTES

1 Wire -- 4 Wires capped and stowed near DM23066A.

FIGURE 1. CABIN MANAGEMENT TERMINAL WIRE CHANGE

Apr 9/98 SHEET 2 OF 2 777-23-0057

9

Commercial

Airplane

Group

777

Service Bulletin

Number: 777-23-0057 Evaluation Form

Date: April 9, 1998

ATA System: 2339

Prepared By: Iftikhar A. Beg

SUBJECT: COMMUNICATIONS - PASSENGER ADDRESS AND ENTERTAINMENT - CABIN

MANAGEMENT SYSTEM - CABIN SYSTEM CONTROL PANEL WIRE CHANGE

Use this evaluation form to tell us what you think of the quality of this service bulletin. We will use the data

that you give us to improve the quality of our service bulletins.

NOTE: Please do not use this evaluation form to tell us to make changes to your manuals. To make these

changes, please use a Publication Change Request (PCR) form.

Please give us this data:

(If necessary, please use the other side. Thank you for the time you used to give us your comments.)

OPERATOR: TODAY'S DATE:

PREPARED BY: TITLE:

ORGANIZATION: TELEX CODE:

TELEPHONE NUMBER: BASE:

Please rate the quality of this service bulletin: (good) 4321 (poor)

Please rate the quality of the illustrations: (good) 4321 (poor)

Will you do the change given by this service bulletin? Yes No If not, please explain:

Is this service bulletin easy to understand? Yes No If not, please explain:

Is this service bulletin easy to use? Yes No If not, please explain:

Are the Planning Information, Material Information, and

Accomplishment Instructions accurate? Yes No If not, please explain:

Is the Manpower estimate accurate? Yes No If not, please explain:

Give the completed evaluation form to your Boeing Field Service Representative or send the evaluation form

directly to this address:

T.J. Taylor, Manager

Service Bulletin Engineering

Boeing Commercial Airplane Group

P.O. Box 3707, Mail Stop 2H-36

Seattle, WA 98124-2207

BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE, WASHINGTON 98124-2207