Boeing ASB 767-21A0247: Revision 1, text

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Commercial Airplanes 767 Service Bulletin ALERT Number: 767-21A0247 Original Issue: October 10, 2011 ATA System: 2158 SUBJECT: AIR CONDITIONING - Equipment Cooling System - 3-Way Valve Control Logic Change Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2011 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties.

Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.

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 the Boeing livery 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.

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Original Issue: October 10, 2011 767-21A0247 2 of 59 BOEING SERVICE BULLETIN 767-21A0247

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Table of Contents

Summary5

1. PLANNING INFORMATION9

A. Effectivity9

1. Airplanes9

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 2 G. Manpower .............................................. 1 2 H. Weight and Balance Changes .................................... 1 3 I. Electrical Load Data ......................................... 1 3 J. References .............................................. 1 3

1. Existing Data .......................................... 1 3

2. Data supplied with this Service Bulletin ............................ 1 3

3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 1 3 K. Publications Affected ........................................ 1 4 L. Interchangeability and Intermixability of Parts ........................... 1 4

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 7

3. Parts Modified and Reidentified ................................ 1 7

4. Parts Removed and Not Replaced .............................. 1 8 D. Parts Necessary to Change Spares ................................. 1 8 E. Special Tooling - Price and Availability ............................... 1 8 F. Special Tooling Necessary to do this Service Bulletin ....................... 1 8

3. ACCOMPLISHMENT INSTRUCTIONS .................................. 1 9 A. GENERAL INFORMATION ..................................... 1 9 B. WORK INSTRUCTIONS ....................................... 2 0 FIGURE 1: E8 EICAS RACK PRESSURE SWITCH BRACKET - INSTALLATION ........... 2 6 FIGURE 2: E8 EICAS RACK PRESSURE SWITCH AND ATTACH HARDWARE - INSTALLATION . 30 FIGURE 3: P36 LEFT MISCELLANEOUS ELECTRICAL EQUIPMENT PANEL WIRE BUNDLE W176 - ROUTING ............................................ 3 3 FIGURE 4: P36 LEFT MISCELLANEOUS ELECTRICAL EQUIPMENT PANEL WIRE BUNDLE W176 - WIRING CHANGE ....................................... 3 8 FIGURE 5: MAIN EQUIPMENT CENTER WIRE BUNDLE W596 - ROUTING .............. 4 0 FIGURE 6: MAIN EQUIPMENT CENTER WIRE BUNDLE W596 AND P50 ELECTRICAL SYSTEMS CARD FILE PANEL WIRE BUNDLE W1114 - WIRING CHANGES ................. 4 8 FIGURE 7: MAIN EQUIPMENT CENTER WIRE BUNDLE W1702 - ROUTING ............. 4 9 FIGURE 8: MAIN EQUIPMENT CENTER WIRE BUNDLE W1702 - WIRING CHANGE ........ 5 2 FIGURE 9: E8 EICAS RACK WIRE BUNDLE W2000 - ROUTING .................... 5 3

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FIGURE 10: E8 EICAS RACK WIRE BUNDLE W2000 - WIRING CHANGE ............... 5 5 FIGURE 11: P36 LEFT MISCELLANEOUS ELECTRICAL EQUIPMENT PANEL - RELAY REPLACEMENT .................................................. 5 7

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Commercial Airplanes 767 Service Bulletin ALERT SummaryNumber: 767-21A0247Original Issue: October 10, 2011 ATA System: 2158 SUBJECT: AIR CONDITIONING - Equipment Cooling System - 3-Way Valve Control Logic Change

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 Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND This service bulletin is sent to reduce malfunctions of flight compartment display units. Blanking, blurring, or loss of color caused by moisture or condensation being collected inside the display units can occur during operation in hot and humid environments. If this service bulletin is not done, there is an increased risk that the flight compartment display units could malfunction and become unserviceable because of moisture ingress. Loss of the primary attitude information on both primary display units could lead to flight crew confusion and difficulty in the transition to standby attitude indication. The inability of the flight crew to transition from primary attitude indication to standby attitude indication during a critical phase of flight could contribute to an unsafe flight condition. Flight compartment indication blanking can also cause unscheduled maintenance and airplane downtime.

Operators of 767-300F airplanes have reported display unit malfunctions such as blanking, blurring, or loss of color caused by moisture or condensation being collected inside the display units during operation in hot and humid environments. The reports have included single display unit and multiple display unit malfunctions. Boeing is aware of instances that are the likely causes of display unit malfunctions related to moisture or condensation ingress. These instances are as follows; an unserviceable air conditioning pack water separation system, that allowed water to be delivered to the flight compartment in the air conditioned air, a malfunction of an air conditioning pack which caused ice to be delivered to the flight compartment in the air conditioned air, and the most frequent instance was display units being cold soaked by the air conditioned air delivered from the air conditioning packs by the Electrical/Electronic cooling system through the 3-way valve in hot and humid conditions.

As a result of these findings, the control logic of the 3-way valve is changed so that the valve will open after five minutes at an altitude above 10,000 feet, and close at an altitude below 10,000 feet. Limiting the 3-way valve to open after five minutes above 10,000 feet will decrease the amount of moisture or condensation that can collect in the display units because of the reduced water content in the atmosphere at higher altitudes.

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Accomplishment of this service bulletin installs a new relay in the P36 Left Miscellaneous Electrical Equipment Panel, with related wiring changes, and installs a new 10,000 feet altitude pressure switch to the E8 Engine Indication and Crew Alerting System (EICAS) rack to change the control logic of the 3-way valve operation above and below an altitude of 10,000 feet. This change reduces the amount of moisture or condensation that can collect in the flight compartment display units and thus reduce malfunction occurrences.

Boeing Service Related Problem (SRP) 767-SRP-21-0179 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 767 FTD 21-09003 is related to this service bulletin.

ACTION (PRR B12900-260) Get access to the airplane Main Equipment Center (MEC). Install a new bracket, new pressure switch, and attach hardware to the E8 Engine Indication and Crew Alerting System (EICAS) rack. Open the P36 left miscellaneous equipment panel in the MEC and make changes to wire bundle W176. Make changes to wire bundle W596 between the P36 left miscellaneous equipment panel and P50 Electrical Systems Card File panel.

In the P50 Electrical Systems Card File panel, make changes to wire bundle W1114. Make changes to wire bundle W1702 between the P36 left miscellaneous equipment panel and E8 EICAS rack. At the E8 EICAS rack, make changes to wire bundle W2000. In the P36 left miscellaneous equipment panel, remove relay K10355 and install new relay K10718. Flush and leak check the Auxiliary Static system No. 2 (AS2), and test the 3-way valve control logic.

The changes in this service bulletin will not change the Engine Indication and Crew Alerting System (EICAS).

EFFECTIVITY 767-300F Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.

COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

Boeing recommends that the change given in this service bulletin be done within 6 years after the original issue date of this service bulletin.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of July 29, 2009. Please refer to Paragraph

2.B., Industry Support Information.

MANPOWER Elapsed HoursTotal Task HoursAirplanes

15.4515.45767-300F Airplanes

MATERIAL INFORMATION Boeing Supplied Kits.

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BOEING SERVICE BULLETIN 767-21A0247

ALERT ALERT Operator Supplied Parts/Materials.

Refer to Paragraph 2.A., Material - Price and Availability P36 LEFT MISCELLANEOUS EQUIPMENT PANEL:

MAKE CHANGES TO WIRE BUNDLE W176.

INSTALL NEW RELAY K10718.

P50 ELECTRICAL SYSTEMS CARD FILE PANEL:

MAKE CHANGES TO WIRE BUNDLE W1114.

MAKE CHANGES TO WIRE BUNDLE W596. MAKE CHANGES TO WIRE BUNDLE W1702.

E8 EICAS RACK:

MAKE CHANGES TO WIRE BUNDLE W2000.

INSTALL NEW PRESSURE SWITCH, NEW

BRACKET, AND ATTACH NEW HARDWARE.

MAIN EQUIPMENT CENTER (MEC) 2032531 (TYPICAL) Original Issue: October 10, 2011 767-21A0247

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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 Document D624T001 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 B12900-260 for data about this change.

DESCRIPTIONCONFIGURATIONGROUP 767-300F airplanes, Variable Numbers VR201 thru VR211, and VW701 thru VW721 that must do Boeing service bulletin 767-21-0235 prior to or concurrent with this service bulletin.

-1 767-300F airplanes, Variable Numbers VR266 thru VR272 that have had the intent of Boeing service bulletin 767-21-0235 incorporated prior to delivery.

-2 Airplane Models:

767-300F GroupVariable Number 1VR201 - VR211 2VR266 - VR272

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GroupVariable Number 1VW701 - VW721

2. Spares Affected None.

B. Concurrent Requirements Group 1:

The service bulletin listed below must be done on Group 1 airplanes before or at the same time as this service bulletin:

Group 1:

DescriptionService BulletinCompany This service bulletin gives instructions to install a relay and related wiring in the P36 left miscellaneous equipment panel to change the control logic of the equipment cooling 3-way valve.

767-21-0235 Original Issue or Revision 1 Boeing Group 2:

None.

C. Reason This service bulletin is sent to reduce malfunctions of flight compartment display units. Blanking, blurring, or loss of color caused by moisture or condensation being collected inside the display units can occur during operation in hot and humid environments. If this service bulletin is not done, there is an increased risk that the flight compartment display units could malfunction and become unserviceable because of moisture ingress. Loss of the primary attitude information on both primary display units could lead to flight crew confusion and difficulty in the transition to standby attitude indication. The inability of the flight crew to transition from primary attitude indication to standby attitude indication during a critical phase of flight could contribute to an unsafe flight condition. Flight compartment indication blanking can also cause unscheduled maintenance and airplane downtime.

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result of these findings, the control logic of the 3-way valve is changed so that the valve will open after five minutes at an altitude above 10,000 feet, and close at an altitude below 10,000 feet. Limiting the 3-way valve to open after five minutes above 10,000 feet will decrease the amount of moisture or condensation that can collect in the display units because of the reduced water content in the atmosphere at higher altitudes.

Boeing Service Related Problem (SRP) 767-SRP-21-0179 is related to this service bulletin.

Boeing Fleet Team Digest (FTD) 767 FTD 21-09003 is related to this service bulletin.

D. Description Get access to the airplane Main Equipment Center (MEC). Install a new bracket, new pressure switch, and attach hardware to the E8 Engine Indication and Crew Alerting System (EICAS) rack. Open the P36 left miscellaneous equipment panel in the MEC and make changes to wire bundle W176. Make changes to wire bundle W596 between the P36 left miscellaneous equipment panel and P50 Electrical Systems Card File panel. In the P50 Electrical Systems Card File panel, make changes to wire bundle W1114. Make changes to wire bundle W1702 between the P36 left miscellaneous equipment panel and E8 EICAS rack. At the E8 EICAS rack, make changes to wire bundle W2000. In the P36 left miscellaneous equipment panel, remove relay K10355 and install new relay K10718. Flush and leak check the Auxiliary Static system No. 2 (AS2), and test the 3-way valve control logic.

The changes in this service bulletin will not change the Engine Indication and Crew Alerting System (EICAS).

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

Affected Maintenance Zones ZoneModel 117, 119767-300F E. Compliance The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.

Boeing recommends that the change given in this service bulletin be done within 6 years after the original issue date of this service bulletin.

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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. 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.

Included in the service bulletin approval is an FAA finding of compliance with the Fuel Tank Ignition Prevention rule (14 CFR section 25.981(a)(3) Amendment 102 or higher).

G. Manpower The table below shows an estimate of the task hours necessary to do this service bulletin 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

0.500.501Open Access

1.001.001FIGURE 1

1.001.001FIGURE 2 ---FIGURE 3 (Wire routing only)

1.701.701FIGURE 4 ---FIGURE 5 (Wire routing only)

0.200.201FIGURE 6 ---FIGURE 7 (Wire routing only)

2.102.101FIGURE 8 ---FIGURE 9 (Wire routing only)

3.703.701FIGURE 10

0.750.751FIGURE 11

0.500.501Close Access

4.004.001Test

15.4515.45TOTAL FOR EACH AIRPLANE

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