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Commercial Airplanes 777 Service Bulletin ALERT Number: 777-22A0024 Original Issue: January 22, 2010 ATA System: 2211 SUBJECT: AUTOFLIGHT - Autopilot Flight Director System - Install Autopilot Flight Director Computer Operational Program Software 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BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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.
BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 22, 2010 777-22A0024 1 of 17
3.0
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Original Issue: January 22, 2010 777-22A0024 2 of 17 BOEING SERVICE BULLETIN 777-22A0024
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Table of Contents
Summary5
1. PLANNING INFORMATION7
A. Effectivity7
1. Airplanes7
2. Spares Affected ........................................ 1 1 B. Concurrent Requirements ...................................... 1 1 C. Reason ................................................ 1 1 D. Description .............................................. 1 1 E. Compliance .............................................. 1 2 F. Approval ............................................... 1 2 G. Manpower .............................................. 1 2 H. Weight and Balance Changes .................................... 1 2 I. Electrical Load Data ......................................... 1 2 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 3 L. Interchangeability and Intermixability of Parts ........................... 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 5
3. Parts Modified and Reidentified ................................ 1 5
4. Parts Removed and Not Replaced .............................. 1 5 D. Parts Necessary to Change Spares ................................. 1 5 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
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Original Issue: January 22, 2010 777-22A0024 3 of 17 BOEING SERVICE BULLETIN 777-22A0024
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Original Issue: January 22, 2010 777-22A0024 4 of 17 BOEING SERVICE BULLETIN 777-22A0024
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Commercial Airplanes 777 Service Bulletin ALERT SummaryNumber: 777-22A0024Original Issue: January 22, 2010 ATA System: 2211 SUBJECT: AUTOFLIGHT - Autopilot Flight Director System - Install Autopilot Flight Director Computer Operational Program Software
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 the part number and installation instructions for the new Operational Program Software (OPS) for the Autopilot Flight Director Computer (AFDC). The new software changes the autopilot engagement logic to make sure the flight crew will not engage the autopilot by mistake prior to the takeoff roll. The new software also improves Autopilot/Flight Director performance during performance limited go-arounds with one engine inoperative. The consequence for not incorporating this service bulletin is that airlines may experience inadvertent engagement of autopilot leading to rejected take-off and a lower climb gradient than is optimal for obstacle clearance during performance limited go-arounds.
Since 1995 there have been nine reported instances of a rejected takeoff because of higher than normal control column forces at takeoff rotation due to the pilot inadvertently engaging the autopilot in lower-speed takeoff roll.
When the flight crew inadvertently engages the autopilot on ground during the lower-speed phase of the takeoff roll, the control column forces will be higher than normal when the pilot attempts to initiate the takeoff rotation.
This can result in a rejected takeoff at rotation speed and a consequent possibility of a runway overrun. The new software will disengage the autopilot whenever the flaps are extended and the airplane is on the ground and not in rollout mode. The autopilot is inhibited when the flaps are extended and the airplane is on the ground or below 50 feet Above Ground Level (AGL). The autopilot is not inhibited if the radio altimeter or Flap Slat Electronic Unit (FSEU) data is invalid.
Boeing discovered during flight simulations the climb gradient is less than optimal for obstacle clearance during a one-engine takeoff situation. The new software maintains the initial engine-out go-around pitch target for a longer duration to minimize altitude loss during the go-around. It also targets a velocity to maximize climbout performance.
Boeing Service Related Problem (SRP) 777-SRP-22-0030 and 777-SRP-22-0031 are related to this service bulletin.
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Original Issue: January 22, 2010 777-22A0024 5 of 17
ACTION (PRR 62777-66S) Install new AFDC OPS in the left, center, and right AFDCs.
NOTE: New AFDC OPS can only be installed in AFDC 822-0006-103, -104, or -105.
EFFECTIVITY 777-200, 777-200LR, 777-300, 777-300ER, and 777F 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 12 months after the original issue date of this service bulletin.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of December 04, 2008. Please refer to Paragraph 2.B., Industry Support Information.
MANPOWER Elapsed HoursTotal Task HoursAirplanes
1.501.50Group 1
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability
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Original Issue: January 22, 2010 777-22A0024 6 of 17 BOEING SERVICE BULLETIN 777-22A0024
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Commercial Airplanes 777 Service Bulletin ALERT Number: 777-22A0024 Original Issue: January 22, 2010 ATA System: 2211 SUBJECT: AUTOFLIGHT - Autopilot Flight Director System - Install Autopilot Flight Director Computer Operational Program Software
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 D624W001 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 62777-66S for data about this change.
DESCRIPTIONCONFIGURATIONGROUP 777-200/200LR/300/300ER/F-1 Airplane Models:
777-200, 777-200LR, 777-300, 777-300ER, 777F GroupVariable Number 1WA001 - WA017 1WA076 - WA080 1WA086 - WA093 1WA101 - WA104 1WA116 - WA119 1WA131 - WA137
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Original Issue: January 22, 2010 777-22A0024 7 of 17
GroupVariable Number 1WA171 - WA175 1WA196 - WA198 1WA206 - WA212 1WA221 - WA223 1WA231 - WA232 1WA241 - WA250 1WA261 - WA266 1WA281 - WA283 1WA301 - WA304 1WB001 - WB021 1WB031 - WB046 1WB051 - WB088 1WB101 - WB106 1WB121 - WB125 1WB131 - WB148 1WB151 - WB155 1WB161 - WB177 1WB181 - WB194 1WB201 - WB215 1WB231 - WB247 1WB271 - WB273 1WB276 - WB286 1WB291 - WB302 1WB306 - WB307 1WB311 - WB337 1WB341 - WB342 1WB366 - WB368 1WB371 - WB388 1WB406 1WB411 - WB413 1WB416 - WB439 1WB446 - WB453 1WB476
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Original Issue: January 22, 2010 777-22A0024 8 of 17 BOEING SERVICE BULLETIN 777-22A0024
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GroupVariable Number 1WB481 - WB484 1WB501 - WB512 1WB531 - WB537 1WB551 - WB554 1WB591 - WB597 1WB601 - WB606 1WB611 - WB622 1WB631 - WB638 1WB646 - WB649 1WC051 - WC073 1WC101 - WC104 1WC111 - WC120 1WC221 - WC222 1WC241 - WC243 1WC281 - WC290 1WC301 - WC308 1WC361 - WC364 1WC371 - WC374 1WC381 - WC395 1WC441 1WC446 - WC449 1WC456 - WC459 1WC486 - WC493 1WC506 - WC508 1WC521 - WC522 1WC531 - WC536 1WC546 - WC548 1WC556 1WC566 - WC567 1WC571 - WC574 1WD001 - WD002 1WD011 - WD018 1WD031 - WD036
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Original Issue: January 22, 2010 777-22A0024 9 of 17 BOEING SERVICE BULLETIN 777-22A0024
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GroupVariable Number 1WD046 - WD055 1WD066 - WD073 1WD081 - WD082 1WD501 - WD512 1WD521 - WD541 1WD546 - WD554 1WD561 - WD573 1WD581 - WD599 1WD606 - WD609 1WD621 - WD632 1WD651 - WD663 1WD671 - WD675 1WD691 - WD709 1WD741 - WD752 1WD761 - WD771 1WD786 - WD788 1WD796 - WD807 1WD826 - WD834 1WD846 - WD857 1WD871 - WD877 1WD911 - WD914 1WD936 - WD939 1WD946 - WD947 1WD966 - WD969 1WD981 - WD982 1WF001 - WF003 1WF016 - WF018 1WF031 - WF032 1WF046 1WF076 - WF077 1WF081 - WF082
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Original Issue: January 22, 2010 777-22A0024 10 of 17 BOEING SERVICE BULLETIN 777-22A0024
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2. Spares Affected None.
B. Concurrent Requirements None.
C. Reason This service bulletin gives the part number and installation instructions for the new Operational Program Software (OPS) for the Autopilot Flight Director Computer (AFDC). The new software changes the autopilot engagement logic to make sure the flight crew will not engage the autopilot by mistake prior to the takeoff roll. The new software also improves Autopilot/Flight Director performance during performance limited go-arounds with one engine inoperative. The consequence for not incorporating this service bulletin is that airlines may experience inadvertent engagement of autopilot leading to rejected take-off and a lower climb gradient than is optimal for obstacle clearance during performance limited go-arounds.
Since 1995 there have been nine reported instances of a rejected takeoff because of higher than normal control column forces at takeoff rotation due to the pilot inadvertently engaging the autopilot in lower-speed takeoff roll. When the flight crew inadvertently engages the autopilot on ground during the lower-speed phase of the takeoff roll, the control column forces will be higher than normal when the pilot attempts to initiate the takeoff rotation. This can result in a rejected takeoff at rotation speed and a consequent possibility of a runway overrun. The new software will disengage the autopilot whenever the flaps are extended and the airplane is on the ground and not in rollout mode. The autopilot is inhibited when the flaps are extended and the airplane is on the ground or below 50 feet Above Ground Level (AGL). The autopilot is not inhibited if the radio altimeter or Flap Slat Electronic Unit (FSEU) data is invalid.
Boeing discovered during flight simulations the climb gradient is less than optimal for obstacle clearance during a one-engine takeoff situation. The new software maintains the initial engine-out go-around pitch target for a longer duration to minimize altitude loss during the go-around. It also targets a velocity to maximize climbout performance.
Boeing Service Related Problem (SRP) 777-SRP-22-0030 and 777-SRP-22-0031 are related to this service bulletin.
D. Description Install new AFDC OPS in the left, center, and right AFDCs.
NOTE: New AFDC OPS can only be installed in AFDC 822-0006-103, -104, or -105.
The work in this service bulletin is done in the maintenance zone(s) given below.
Affected Maintenance Zones ZoneModel 212777-200, 777-200LR, 777-300, 777-300ER, 777F
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Original Issue: January 22, 2010 777-22A0024 11 of 17 BOEING SERVICE BULLETIN 777-22A0024
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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 12 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 Time to schedule the work Time to inspect the work Time to find the tools.
NOTE: This estimate gives general service bulletin incorporation time. The specific software data transfer times can be found in 777 AMM 20-15-11.
Elapsed HoursTask HoursNumber of Persons Task
1.501.501Install Software
1.501.50TOTAL FOR EACH AIRPLANE H. Weight and Balance Changes None.
I. Electrical Load Data Not changed.
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Original Issue: January 22, 2010 777-22A0024 12 of 17 BOEING SERVICE BULLETIN 777-22A0024