Commercial 

Airplanes 737

Service Bulletin

ALERT

Number: 737-22A1211

Original Issue: April 13, 2010

ATA System: 2200

SUBJECT: AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software Change

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

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Unpublished Work - All Rights Reserved

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BLANK PAGE
Table of Contents

Summary ...................................................... 5

1. PLANNING INFORMATION ........................................ 7

A. Effectivity ................................................ 7

1. Airplanes ............................................. 7

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1. Existing Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2. Data supplied with this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3. Installation Drawings Used in the Preparation of this Service Bulletin . . . . . . . . . . . . 13

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Kits/Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. Parts and Materials Supplied by the Operator . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Parts Modified and Reidentified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. Parts Removed and Not Replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 16

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

ALERT

Summary Number: 737-22A1211

Original Issue: April 13, 2010

ATA System: 2200

SUBJECT: AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software 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

None.

BACKGROUND

This service bulletin gives instructions to do a part number check of the Flight Control Computer (FCC) Operational

Program Software (OPS) installed in the Flight Control Computers. If the software part number is not

2276-COL-AC1-05 (P4.0) or 2275-COL-AC1-06 (P5.0), new software must be installed. The new software will

reduce the incidence of unflagged Radio Altimeter outputs that cause a premature autothrottle landing retard.As

a result of in-service incidents, it was found that an erroneous unflagged Captain's Radio Altimeter output will

cause the autothrottle to enter Landing Flare Retard mode prematurely on approach. If this change is not done,

an erroneous unflagged Captain's Radio Altimeter output on a manual or single channel autopilot approach

could result in premature autothrottle landing flare retard and the loss of automatic speed control.

For more information refer to Boeing Service letters (SL) 737-SL-22-057 and 737-SL-22-059, which are related

to this service bulletin.

Fleet Team Digest (FTD) 737NG FTD 34-09008 is related to this service bulletin.

Boeing Service Related Problem (SRP) 737-SRP-22-0032 is related to this service bulletin.

ACTION

Do a part number check of the Flight Control Computers (FCC) Operational Program Software (OPS). If the

software part number installed is not part number 2276-COL-AC1-05 or 2275-COL-AC1-06, install new software.

EFFECTIVITY

737-600/-700/-700C/-800/-900 Airplanes. Refer to Paragraph 1.A., Effectivity, Airplanes, for the list of affected

airplanes.

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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 90 days 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 1.00 1.00

MATERIAL INFORMATION

Operator Supplied Parts/Materials.

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

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ALERT ALERT
Commercial 

Airplanes 737

Service Bulletin

ALERT

Number: 737-22A1211

Original Issue: April 13, 2010

ATA System: 2200

SUBJECT: AUTOFLIGHT - Digital Flight Control System - Flight Control Computer Software 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.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

Refer to Service Bulletin Index Document D6-19567 Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

This service bulletin is for the airplanes shown below.

GROUP CONFIGURATION DESCRIPTION

737 Airplanes without Fight Control Conputer Operational Program

Software part number 2276-COL-AC1-05 or 2275-COL-AC1-06

installed

1 -

Airplane Models:

737-600, 737-700, 737-700C, 737-800, 737-900

Variable Number Group

YA129 - YA199 1

YA372 - YA377 1

YA630 - YA631 1

YA642 1

YA666 - YA667 1

YA709 - YA710 1

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Variable Number Group

YA859 - YA862 1

YA971 - YA978 1

YB120 - YB132 1

YB156 - YB158 1

YB163 - YB164 1

YB184 1

YB208 1

YB371 - YB391 1

YB522 - YB526 1

YB541 - YB544 1

YB567 - YB598 1

YB606 - YB632 1

YB651 1

YB656 1

YB851 - YB863 1

YB871 - YB874 1

YB881 - YB890 1

YB901 - YB903 1

YB911 1

YB961 - YB964 1

YC083 1

YC170 1

YC186 - YC189 1

YC201 - YC203 1

YC206 - YC207 1

YC305 1

YC384 - YC387 1

YC393 - YC394 1

YC742 - YC743 1

YD007 1

YD056 - YD057 1

YD108 - YD110 1

YD156 - YD159 1

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BOEING SERVICE BULLETIN 737-22A1211

ALERT ALERT
Variable Number Group

YD218 - YD219 1

YD261 1

YD331 - YD334 1

YD412 - YD414 1

YD484 - YD485 1

YD491 - YD495 1

YD508 - YD512 1

YD535 1

YD561 - YD564 1

YD571 - YD572 1

YD591 - YD595 1

YD651 - YD655 1

YE205 - YE206 1

YE321 - YE326 1

YE371 - YE379 1

YG091 - YG096 1

YG101 - YG102 1

YG202 - YG205 1

YG211 - YG213 1

YG507 - YG509 1

YJ003 - YJ005 1

YJ011 - YJ013 1

YJ021 1

YJ480 1

YJ531 - YJ553 1

YJ591 - YJ594 1

YJ677 - YJ685 1

YJ690 - YJ693 1

YJ805 - YJ867 1

YJ901 - YJ902 1

YJ911 - YJ928 1

YJ931 - YJ936 1

YJ941 - YJ947 1

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ALERT ALERT
Variable Number Group

YK001 - YK007 1

YK101 - YK104 1

YK111 - YK112 1

YK121 - YK122 1

YK131 - YK132 1

YK136 - YK137 1

YK141 - YK142 1

YK146 - YK147 1

YK151 - YK154 1

YK161 - YK162 1

YK301 - YK305 1

YK321 - YK332 1

YK361 - YK369 1

YK401 - YK406 1

YK426 - YK427 1

YK431 - YK436 1

YK456 - YK460 1

YK476 1

YK480 - YK484 1

YK511 - YK514 1

YK551 - YK563 1

YK571 1

YK601 - YK602 1

YK611 - YK613 1

YK621 - YK623 1

YK631 1

YK641 - YK642 1

YK701 - YK707 1

YK801 - YK818 1

YK901 - YK906 1

YK941 1

YL001 - YL004 1

YL011 1

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ALERT ALERT
Variable Number Group

YM101 - YM103 1

YM201 - YM211 1

YM251 - YM297 1

YM471 1

YM481 - YM484 1

YM501 - YM507 1

YM521 - YM522 1

YM541 1

YM551 - YM553 1

YM571 - YM572 1

YM591 - YM593 1

YN001 - YN006 1

YN061 1

YN101 - YN105 1

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

This service bulletin gives instructions to do a part number check of the Flight Control Computer (FCC)

Operational Program Software (OPS) installed in the Flight Control Computers. If the software part

number is not 2276-COL-AC1-05 (P4.0) or 2275-COL-AC1-06 (P5.0), new software must be installed.

The new software will reduce the incidence of unflagged Radio Altimeter outputs that cause a premature

autothrottle landing retard.As a result of in-service incidents, it was found that an erroneous unflagged

Captain's Radio Altimeter output will cause the autothrottle to enter Landing Flare Retard mode

prematurely on approach. If this change is not done, an erroneous unflagged Captain's Radio Altimeter

output on a manual or single channel autopilot approach could result in premature autothrottle landing

flare retard and the loss of automatic speed control.

For more information refer to Boeing Service letters (SL) 737-SL-22-057 and 737-SL-22-059, which

are related to this service bulletin.

Fleet Team Digest (FTD) 737NG FTD 34-09008 is related to this service bulletin.

Boeing Service Related Problem (SRP) 737-SRP-22-0032 is related to this service bulletin.

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BOEING SERVICE BULLETIN 737-22A1211

ALERT ALERT
D. Description

Inspect the part number of the Flight Control Computer (FCC) Operational Program Software (OPS).

If the software part number installed is not part number 2276-COL-AC1-05 or 2275-COL-AC1-06, install

new software.

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

Affected Maintenance Zones

Model Zone

737-600, 737-700, 737-700C, 212

737-800, 737-900

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 90 days 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 cure the materials

• Time to make the parts

• Time to find the tools.

NOTE: This estimate gives general service bulletin incorporation time. The specific software data

transfer times can be found in 737-600/700/800/900 AMM 20-15-11.

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ALERT ALERT
Task Number of Persons Task Hours Elapsed Hours

Software Inspection 1 0.50 0.50

Install Software (a) 1 0.50 0.50

TOTAL FOR EACH AIRPLANE 1.00 1.00

(a) Only necessary if P4.0 or P5.0 software is not installed.

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data

a. Boeing Service Letter 737-SL-22-057, 737-SL-22-059

b. Boeing Service Related Problem (SRP) 737-SRP-22-0032

c. 737-600/700/800/900 Aircraft Maintenance Manual (AMM) 20-15-11, 22-11-33

d. 737NG Fleet Team Digest (FTD) 34-09008

2. Data supplied with this Service Bulletin

None.

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

None.

K. Publications Affected

1. Publications:

Publication Chapter-Section

737 Illustrated Parts Catalog 22-11

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.

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ALERT ALERT
L. Interchangeability and Intermixability of Parts

Refer to Paragraph 2.C., Parts Necessary for Each Airplane, for interchangeability and intermixability

information.

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ALERT ALERT
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 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

Media Set Part Num- Media Set Name Software Part Number Software Name Notes

ber

(a) (b) (c)

(d) (e) (f)

831-5854-140 FCC OPS DISK SET 2276-COL-AC1-05 FCC OPS

(a) (b) (c)

(d) (e) (f)

(g)

831-5854-150 FCC OPS DISK SET 2275-COL-AC1-06 FCC OPS

(a) This software part number is used in production. Operators may already have this media set.

(b) Do not install previous versions of this software after installation of the new software part number.

(c) Install this software only if the Flight Control Computers part number 822-1604-101 or 822-1604-151 are

installed on the airplane.

(d) The existing media set part number is 831-5854-111 or 831-5854-120 or 831-5854-130.

(e) Only one media set is necessary for each operator.

(f) The media set can be obtained directly from the supplier: Rockwell Collins Aerospace & Electronics Inc.

DRA RC Displays Systems (09344), 400 Collins Road N.E., M/S 133-100 Cedar Rapids, Lowa 52498

(g) This is the preferred software option.

3. Parts Modified and Reidentified

None.

4. Parts Removed and Not Replaced

None.

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D. Parts Necessary to Change Spares

None.

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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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. The instructions identified in Paragraph 3.B., Work Instructions give the recommended

sequence of steps.

2. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for

definition of the acronyms.

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

4. 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.

5. Refer to 737-600/700/800/900 AMM 20-15-11 for on-airplane software installation

maintenance practices and data transfer times as accepted procedures.

B. WORK INSTRUCTIONS

1. Get access to the flight deck and do the Software Installation Test from the Flight Management

Computer System (FMCS) Computer Display Unit (CDU). Refer to 737-600/700/800/900 AMM

22-11-33 as an accepted procedure.

2. Inspect the Flight Control Computers (FCC) Operational Program Software (OPS) part numbers.

a. If the software part number is listed in Table 1 below, install new software. Refer to

737-600/700/800/900 AMM 22-11-33 as an accepted procedure.

Table 1

Reference Version

Number

Diskette Set - Rockwell

Collins Part Number

Diskette Set - Boeing

Part Number

Operation Program

Software Part Number

2271-COL-AC1-02 S241A100-502 831-5854-111 P1.1

2270-COL-AC1-03 S241A100-503 831-5854-120 P2.0

2277-COL-AC1-04 S241A100-504 831-5854-130 P3.0

b. If the software part number is listed in Table 2 below, no more work is necessary.

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ALERT ALERT
Table 2

Reference Version

Number

Diskette Set - Rockwell

Collins Part Number

Diskette Set - Boeing

Part Number

Operation Program

Software Part Number

2276-COL-AC1-05 S241A100-505 831-5854-140 P4.0

2275-COL-AC1-06 (a) S241A100-506 831-5854-150 P5.0

(a) Software part number 2275-COL-AC1-06 is the preferred software option.

3. Put the airplane back to a serviceable condition.

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