### Commercial Airplane Group 

# 767 Service Bulletin SPECIAL ATTENTION
Number: 767-23-0160 

## Summary Date: May 31, 2001 ATA System: 2342

SUBJECT:COMMUNICATIONS - Audio Accessory Unit Replacement

THE BOEING COMMERCIAL AIRPLANE GROUP RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. CONCURRENT REQUIREMENTS Boeing Component Service Bulletin 285T0001-23-09 is related to the audio accessory unit. BACKGROUND The flight interphone system can be used for communication between the flight crew and ground handling and servicing personnel in the nose wheel well. The audio accessory unit (AAU) is a component of the flight interphone system. Flight interphone systems with AAU P/N 285T0001-201 or -301 may not reach its full volume until two seconds after the push-to-talk (PTT) switch is keyed on the audio selector panel. This condition may result in miscommunication and is a potential safety hazard. Do the changes in this service bulletin to avoid potential injury to ground handling and servicing personnel. Boeing Service Related Problem (SRP) 767-SRP-23-0070 is related to this service bulletin.
ACTION On the E2-5 shelf, replace the audio accessory unit. Do a test of the audio accessory unit. EFFECTIVITY OperatorGroup Airplanes ANZ Group 1 VS113 BCT Group 1 VS506-VS507 CAM Group 1 VS308 SBL Group 1 VS497 UAL Group 1 VS102 CUL Group 2 VS274 DAL Group 2 VS273, VS470 LAL Group 3 VS303

COMPLIANCE No compliance time is given. INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of December 14, 2000 Please refer to Paragraph 2.B., Industry Support Information. MANPOWER Total Elapsed Time Man-Hours (Hours) 1.5 1.5 The change to the audio accessory unit as given in the component service bulletin is not included.

767-23-0160 Summary Page 1 of 2

### BOEING SERVICE BULLETIN 767-23-0160

MATERIAL INFORMATION Operator Supplied Parts



### FWD 

## MAIN EQUIPMENT CENTER ACCESSORY UNIT REPLACE AUDIO ON THE E2-5 SHELF,V52919

May 31, 2001 767-23-0160 Summary Page 2 of 2

### Commercial Airplane Group 

# 767 Service Bulletin SPECIAL ATTENTION
Number: 767-23-0160 Date: May 31, 2001 ATA System: 2342

SUBJECT:COMMUNICATIONS - Audio Accessory Unit Replacement

THE BOEING COMMERCIAL AIRPLANE GROUP RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY. 1. PLANNING INFORMATION A. Effectivity 1. Airplanes Refer to Service Bulletin Index Document D624T001, Part 3 for Airplane Variable Number, Line Number, and Serial Number data. This service bulletin is for the airplanes shown below. Airplane Models: 767-300 IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AIR NEW ZEALAND (ANZ)

1 VS113 BALAIR/CTA LEISURE LTD. (BCT)

1 VS506-VS507 CAMEROON AIRLINES (CAM)

1 VS308 CHINA UNITED AIRLINES (CUL)

2 VS274 DELTA AIR LINES (DAL)

2 VS273 VS470 LAUDA AIR (LAL)

3 VS303 SOBELAIR (SBL)

1 VS497

May 31, 2001 767-23-0160 Page 1 of 11

### BOEING SERVICE BULLETIN 767-23-0160

UNITED AIRLINES (UAL)

1 VS102
IDENTIFICATION BY VARIABLE NUMBER GROUP 1 VS102 VS113 VS308 VS497 VS506-VS507 GROUP 2 VS273-VS274 VS470 GROUP 3 VS303 2. Spares Affected Examine your spares supply for the parts identified in Paragraph 2.E., Existing Parts Accountability. If any parts are found, refer to Paragraph 2.E. for the recommended use.

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### BOEING SERVICE BULLETIN 767-23-0160

B. Concurrent Requirements Boeing Component Service Bulletin 285T0001-23-09 is related to the audio accessory unit. C. Reason The flight interphone system can be used for communication between the flight crew and ground handling and servicing personnel in the nose wheel well. The audio accessory unit (AAU) is a component of the flight interphone system. Flight interphone systems with AAU P/N 285T0001-201 or -301 may not reach its full volume until two seconds after the push-to-talk (PTT) switch is keyed on the audio selector panel. This condition may result in miscommunication and is a potential safety hazard. Do the changes in this service bulletin to avoid potential injury to ground handling and servicing personnel. Boeing Service Related Problem (SRP) 767-SRP-23-0070 is related to this service bulletin. D. Description On the E2-5 shelf, replace the audio accessory unit. Do a test of the audio accessory unit. The airplane effectivity is divided in three groups because of differences in equipment requirement. The changes in this service bulletin will not change the Engine Indication and Crew Alerting System (EICAS). 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. E. Compliance No compliance time is given. F. 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. 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. 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.

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### BOEING SERVICE BULLETIN 767-23-0160

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 0.50 0,50 Change 1 0.25 0.25 Close Access 1 0.50 0.50 Test 1 0.25 0.25 TOTAL FOR EACH AIRPLANE 1.50 1.50 The change to the audio accessory unit as given in the Boeing Component Service Bulletin 285T0001-23-09 is not included. H. Weight and Balance Changes None I. Electrical Load Data Not changed

May 31, 2001 767-23-0160 4

### BOEING SERVICE BULLETIN 767-23-0160

J. References 1. Existing Data: a. Service Related Problem (SRP) 767-SRP-23-0070 b. 767 Maintenance Manual (AMM) Subject 23-42-01, 24-22-00 c. Boeing Component Service Bulletin 285T0001-23-09, "Communications - Audio Accessory Unit Modification"

2. Data supplied with this service bulletin None 3. Installation Drawings Used in the Preparation of This Service Bulletin: None K. Publications Changed Publication Chapter-Section 767 Wiring Diagram Manual Equipment List 767 Maintenance Manual 23-42, 23-51 767 Fault Isolation Manual 23-42, 23-51
L. Interchangeability and Intermixability of Parts Refer to Paragraph 2.E., Existing Parts Accountability, for interchangeability and intermixability information.

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### BOEING SERVICE BULLETIN 767-23-0160

BLANK PAGE

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### BOEING SERVICE BULLETIN 767-23-0160

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. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin does not show the Boeing price and supply data. B. Industry Support Information Boeing warranty remedies are available for 767 airplanes in warranty as of December 14, 2000. For man-hour and material reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing Product Assurance Contracts. C. Parts Necessary For Each Airplane 1. Kits: None 2. Parts and Materials Supplied by the Operator: QTY Part Number {Specification} Name

1 285T0001-205 (Mod A) (a) Audio Accessory Unit (Group 1 airplanes) 1 285T0001-206 (Mod A) (a) Audio Accessory Unit (Group 2 airplanes) 1 285T0001-302 (a) Audio Accessory Unit (Group 3 airplanes) (a) Boeing Component Service Bulletin 285T0001-23-09 modifies the existing audio accessory unit to the part numbers shown above.

D. Parts Necessary to Change Spares None

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### BOEING SERVICE BULLETIN 767-23-0160

E. Existing Parts Accountability The parts shown below are changed as shown in this service bulletin. Quantity (QTY) is the number of parts changed on each airplane.

Existing Part Number RUC Name QTY New Part Number PNC RC 285T0001-201 (a) (b) RW1 Audio Accessory Unit 1 285T0001-205 (Mod A) (a) S A 285T0001-206 (Mod A) (b) S A 285T0001-301 (c) RW1 Audio Accessory Unit 1 285T0001-302 (c) S A (a) For Group 1 airplanes (b) For Group 2 airplanes (c) For Group 3 airplanes
RUC Recommended Use Code RW1 - Make the change given in Boeing Component Service Bulletin 285T0001-23-09 PNC Part Number Code S - This is the part number for the new equivalent or replacement part. - To get a new part, use this part number in your order. - This part is used in production. RC Replacement Code A - Do not use the existing part to replace the new or changed part.
F. Special Tooling - Price and Availability None G. 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 767-23-0160

3. ACCOMPLISHMENT INSTRUCTIONS GENERAL NOTES 1. The paragraphs identified with a letter give the general work instructions and the necessary tests. The instructions identified with numbers on the figures give the recommended sequence of steps. 2. Obey all of the warnings and cautions given in the specified manual sections. WORK INSTRUCTIONS A. Open these circuit breakers and attach DO-NOT-CLOSE tags: Location Name Panel Position P11 C22 PASS ADRS C23 INTERPHONE CABIN/SERVICE C25 INTERPHONE FLT AMPL DUAL PWR CAPT C26 INTERPHONE DUAL PWR F/O OBS G29 INTERPHONE CAPT FLT AMPL DUAL PWR G30 INTERPHONE F/O OBS DUAL PWR B. On the E2-5 shelf, replace the audio accessory unit as shown in Figure 1. C. Remove DO-NOT-CLOSE tags and close these circuit breakers: Location Name Panel Position P11 C22 PASS ADRS C23 INTERPHONE CABIN/SERVICE C25 INTERPHONE FLT AMPL DUAL PWR CAPT C26 INTERPHONE DUAL PWR F/O OBS G29 INTERPHONE CAPT FLT AMPL DUAL PWR G30 INTERPHONE F/O OBS DUAL PWR D. Supply power to airplane circuits as given in 767 AMM 24-22-00/201. E. Do a test of the audio accessory unit as given in 767 AMM 23-42-01/401. F. Put the airplane back to a serviceable condition.

May 31, 2001 767-23-0160 9

### BOEING SERVICE BULLETIN 767-23-0160

FIGURE TABLE OF CONTENTS Title Page FIGURE 1. E2-5 SHELF - AUDIO ACCESSORY UNIT REPLACEMENT .. . . . . . . . . . . 11

May 31, 2001 767-23-0160 10

### BOEING SERVICE BULLETIN 767-23-0160



### 2 1

FWD E2-5 SHELF



## MAIN EQUIPMENT CENTERV52920
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. STEPTASK NAME PART NUMBER QTYNOTES 1 Remove Audio Accessory Unit 285T0001-201 1 For Group 1 and Group 2 airplanes 285T0001-301 For Group 3 airplane 767 AMM 23-42-01/401 2 Install Audio Accessory Unit 285T0001-205 (Mod A) 1 For Group 1 airplanes 285T0001-206 (Mod A) For Group 2 airplanes
285T0001-302 For Group 3 airplane 767 AMM 23-42-01/401

FIGURE 1. E2-5 SHELF - AUDIO ACCESSORY UNIT REPLACEMENT May 31, 2001 SHEET 1 OF 1 767-23-0160 11

### Commercial Airplane Group 

# 767 Service Bulletin

Number: 767-23-0160 

## Evaluation Form Date: May 31, 2001 ATA System: 2342 Prepared By: Richard Conde

SUBJECT:COMMUNICATIONS - Audio Accessory Unit Replacement

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: Manager Service Bulletin Engineering Boeing Commercial Airplane Group P.O. Box 3707, Mail Stop 2H-37 Seattle, WA 98124-2207