Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 1 of 21

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

EMERGENCY HYDRAULIC POWER - RAM AIR TURBINE - 

CHECK/REPLACE ACTUATOR

© 2014 Hamilton Sundstrand Corporation

PROPRIETARY

THIS DOCUMENT IS THE PROPERTY OF UTC AEROSPACE SYSTEMS. YOU MAY NOT POSSESS, USE, COPY OR DISCLOSE THIS 

DOCUMENT OR ANY INFORMATION IN IT, FOR ANY PURPOSE, INCLUDING WITHOUT LIMITATION, TO DESIGN, MANUFACTURE 

OR REPAIR PARTS, OR OBTAIN ANY GOVERNMENT APPROVAL TO DO SO, WITHOUT UTC AEROSPACE SYSTEMS’ EXPRESS 

WRITTEN PERMISSION. NEITHER RECEIPT NOR POSSESSION OF THIS DOCUMENT ALONE, FROM ANY SOURCE, 

CONSTITUTES SUCH PERMISSION. POSSESSION, USE, COPYING OR DISCLOSURE BY ANYONE WITHOUT UTC AEROSPACE 

SYSTEMS’ EXPRESS WRITTEN PERMISSION IS NOT AUTHORIZED AND MAY RESULT IN CRIMINAL AND/OR CIVIL LIABILITY. 

INFORMATION SUBJECT TO EXPORT CONTROL LAWS

Subject to the EAR, ECCN 9E991

This information is subject to the export control laws of the United States, specifically including the Export Administration Regulations (EAR), 

15 C.F.R. Part 730 et. seq. Transfer, retransfer, or disclosure of this data by any means to a non-U.S. person (individual or company), 

whether in the United States or abroad, without any required export license or other approval from the U.S Government is prohibited, 

including without limitation any diversion to a military end user or use in a military end use application. 

THE DATA IN THIS DOCUMENT WERE DEVELOPED ONLY TO MAINTAIN SYSTEMS AND/OR PARTS MANUFACTURED BY OR FOR 

HAMILTON SUNDSTRAND OR APPROVED BY HAMILTON SUNDSTRAND. THE DATA MAY NOT BE APPLICABLE TO ANY OTHER 

SYSTEMS AND/OR PARTS, REGARDLESS OF THEIR APPARENT SIMILARITY TO SYSTEMS AND/OR PARTS MANUFACTURED BY 

OR FOR HAMILTON SUNDSTRAND OR APPROVED BY HAMILTON SUNDSTRAND. DO NOT RELY IN ANY WAY ON DATA IN THIS 

DOCUMENT TO MAINTAIN OR OTHERWISE SUPPORT SYSTEMS AND/OR PARTS THAT WERE NOT MANUFACTURED BY OR FOR 

HAMILTON SUNDSTRAND OR APPROVED BY HAMILTON SUNDSTRAND WITHOUT EVIDENCE THAT THE FEDERAL AVIATION 

ADMINISTRATION OR OTHER REGULATORY AGENCY HAS DETERMINED THAT THE DATA IN THIS DOCUMENT IS VALID FOR 

SUCH USE.

HAMILTON SUNDSTRAND ASSUMES NO LIABILITY WHATSOEVER, WHETHER CONTRACTUAL, WARRANTY, TORT OR 

OTHERWISE, FOR UNAUTHORIZED ALTERATION OR ALTERATIONS NOT PERFORMED IN ACCORDANCE WITH HAMILTON 

SUNDSTRAND APPROVED PROCEDURES.

1. PLANNING INFORMATION

A. Effectivity

(1) The Hamilton Sundstrand Ram Air Turbines (RAT), Model ERPS33T, all serial 

numbers, that are listed in Table 1 of this bulletin. 

Table 1

Table 1

RAT Part Number Effectivity 

772722D 772722H

772722E 772722J

772722F 772722L

772722G
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 2

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

(2) The RAT actuators that follow: 

(a) For an actuator, PN 5915769 (Arkwin PN 1211526-003), with a serial number that 

is not listed in Table 2 of this bulletin, the actuator should be removed from 

service, modified, and then identified as part number 5917130-2.

(b) All actuators, PN 5912536 (Arkwin PN 1211526-002), from the Supplier Arkwin, 

installed on RAT or stocked as spares, rotables, or repair parts are affected. 

These actuators should be removed from service, modified, and then identified as 

part number 5917130-2.

(c) All actuators PN 5915769 (Arkwin PN 1211526-003), from the Supplier Arkwin, 

installed on RAT or stocked as spares, rotables, or repair parts that are listed in 

Table 2 of this bulletin are affected. (Refer to Table 2 of this bulletin for 

disposition.)

(d) If the actuator nameplate is missing, the actuator should be removed from service 

and returned to Arkwin Industries (CAGE Code 98391). Arkwin Industries should 

modify (if necessary) the actuator (with a missing nameplate), and then identify it 

as part number 5917130-2. 
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 3

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Table 2

Table 2 Note 1: The noted actuators were modified (retrofitted) according to the instructions in 

Hamilton Sundstrand Service Bulletin ERPS33T-29-5 and are correctly shimmed. 

These actuators have the intent of this bulletin incorporated. These retrofitted 

actuators may remain on the aircraft, but should be identified as part number 

5917130-1. (Refer to paragraph 3.F. of this bulletin for identification instructions.)

Table 2

Serial Numbers of Actuators (PN 5915769) from the Supplier Arkwin 

Serial Numbers Description Disposition

New 

Part Number

0007 - 0150 Correctly shimmed (Note 1) Identify 5917130-1

0151 Correctly shimmed (Note 2) Identify 5917130-2

0152 - 0155 Correctly shimmed (Note 1) Identify 5917130-1

0156 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0157 - 0165 Correctly shimmed (Note 1) Identify 5917130-1

0166 - 0168 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0169 Correctly shimmed (Note 1) Identify 5917130-1

0170 - 0171 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0172 - 0173 Correctly shimmed (Note 1) Identify 5917130-1

0174 - 0175 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0176 - 0177 Correctly shimmed (Note 1) Identify 5917130-1

0178 - 0200 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0201 Correctly shimmed (Note 2) Identify 5917130-2

0202 - 0208 Incorrectly shimmed (Note 3) Remove from service, 

modify, and identify

5917130-2

0209 -0210 Correctly shimmed (Note 2) Identify 5917130-2

Serial number is 

not listed above

Unknown Remove from service, 

modify, and identify

5917130-2

Actuator 

nameplate is 

missing

Unknown Remove from service, 

modify, and identify

5917130-2
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 4

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Table 2 Note 2: The noted actuators (that were manufactured by Arkwin) are correctly shimmed. 

These actuators have the intent of this bulletin incorporated. These production 

actuators may remain on the aircraft, but should be identified as part number 

5917130-2. (Refer to paragraph 3.F. of this bulletin for identification instructions.)

Table 2 Note 3: The noted actuators are not correctly shimmed. These actuators should be 

removed from service, modified, and then identified as part number 5917130-2. 

(Refer to paragraph 3.E. of this bulletin for modification instructions.)

B. Concurrent Requirements

(1) For the RAT part numbers listed in Table 3 of this bulletin, which contain one of the 

actuators listed below, Hamilton Sundstrand Service Bulletin ERPS33T-29-5 (Modify 

Actuator) must be done prior to, or in conjunction with, this bulletin.

- an actuator with a serial number that is not listed in Table 2 of this bulletin

- an actuator with a missing nameplate 

- an actuator PN 5912536 (Arkwin PN 1211526-002) Table 3

NOTE: If the actuator serial number is 0145 and prior, the deploy solenoid must be 

replaced. 

NOTE: If the actuator serial number is 0146 and subsequent, the deploy solenoid 

may be modified (refer to Appendix A in Hamilton Sundstrand/Arkwin 

Industries CMM 29-21-04). 

(2) For the RAT part numbers listed in Table 4 of this bulletin, Hamilton Sundstrand 

Service Bulletin ERPS33T-29-6 (Replace Pump) must be done prior to, or in 

conjunction with, this bulletin.

Table 4

Table 3

RAT Part Numbers with a Concurrent Requirement (ERPS33T-29-5) 

772722D

772722E

772722F

Table 4

RAT Part Numbers with a Concurrent Requirement (ERPS33T-29-6) 

772722D

772722E

772722F

772722G
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 5

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

C. Reason

(1) The Arkwin actuator, installed on the A340-500/600 RAT, was found to potentially have 

an insufficient deployment solenoid stroke margin necessary to release the uplock 

mechanism and deploy the RAT. An investigation, conducted by Hamilton Sundstrand 

and Arkwin Industries, determined that the RAT non-deployment was a result of 

insufficient margin of deployment solenoid stroke. A previous modification (to address 

the stroke margin) was found to be inadequate in a specific group of the actuators. It 

created factors that can result in situations in which the solenoid stroke margin is 

eliminated, and failure to deploy can occur. Modification of an affected actuator (to 

shim the solenoid) will provide improved reliability of the RAT. 

(2) This service bulletin introduces the new Hamilton Sundstrand RAT part number listed 

in Table 5 of this bulletin. This service bulletin also introduces two new actuator part 

numbers: Hamilton Sundstrand PN 5917130-1 and PN 5917130-2. 

Table 5

D. Description

(1) This bulletin gives instructions to do one of the following, depending on the part number 

and the serial number of the actuator:

(a) Remove the actuator, modify the actuator, identify the actuator, install the 

actuator, identify the RAT, and test the RAT. 

(b) Identify the actuator and the RAT (if the intent of this bulletin has previously been 

incorporated). 

E. Compliance

(1) Incorporation of this service bulletin is mandatory and is to be accomplished at the 

earliest opportunity. 

F. Approval

(1) The technical content of this document is approved under the authority of DOA 

No. EASA.21J.031.

Table 5

New Hamilton Sundstrand Part Number RAT

772722M
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 6

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

G. Manpower

(1) Depending on the part number and serial number of the actuator, the manpower 

requirement is one of the following:

(a) Approximately 14.0 man-hours will be required to remove the actuator, identify 

the actuator (if required), install the actuator, identify the RAT, and test the RAT. 

(b) Approximately 1.0 man-hour will be required to only identify the actuator and the 

RAT. An additional maximum of 12.5 man-hours may be required if the unit is 

installed on the aircraft and must be removed to view the actuator serial number.

H. Weight and Balance

(1) None

I. Electrical Load Data

(1) Not changed

J. Software Accomplishment Summary

(1) Not Applicable

K. References

(1) Hamilton Sundstrand Component Maintenance Manual (CMM) 29-21-63

(2) Hamilton Sundstrand/Arkwin Industries CMM 29-21-04

(3) Hamilton Sundstrand Standard Practices Manual (SPM) 20-00-00

(4) Applicable Airbus Aircraft Maintenance Manual (AMM)

(5) Hamilton Sundstrand Engineering Changes 13E677 and 14B943

(6) Equipment Definition Evolution Sheet (EDES) A345RAT01-003

(7) This service bulletin is subject to aircraft modification No. 204106 D50788 (classified 

major) and is covered by aircraft Service Bulletin No. A340-29-5025.

(8) Under no circumstances shall the modified equipment, resulting from the application of 

this service bulletin, be installed on the aircraft type unless its aircraft service bulletin 

is approved.
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 7

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

L. Other Publications Affected

(1) Hamilton Sundstrand CMM 29-21-63 will be revised to incorporate this bulletin.

(2) Hamilton Sundstrand/Arkwin Industries CMM 29-21-04 will be revised to incorporate 

this bulletin. 

M. Interchangeability or Intermixability of Parts

(1) Refer to aircraft Service Bulletin No. A340-29-5025.
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 8

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Arkwin Industries or Hamilton Sundstrand will incorporate this modification into 

returned actuators, PN 5912536 (Arkwin PN 1211526-002) or PN 5915769 (Arkwin 

PN 1211526-003), at no charge to the operator. 

(2) Operators should place a single “no charge” order to Arkwin Industries (Attention: 

Peter Muenzen) for their fleet requirements, noting the service bulletin number, serial 

numbers of affected units, total quantity of parts, and anticipated incorporation 

schedule.

Arkwin Industries will have a limited number of actuators in a rotable pool for operator 

use. These will be available to operators on a no charge loan basis (if required), based 

upon availability. Operators should contact Arkwin Industries at the following address 

for scheduling information. 

Arkwin Industries, Inc. 

Attention: Product Support Operations

33 Sylvester Street

Westbury, New York 11590

USA

Phone: (516) 333-2640 x273

Fax: (516) 333-9035

Point of Contact: Peter Muenzen, Repair Station Accountable Manager

(3) It is highly recommended that the unit be shipped to Arkwin Industries in the Arkwin 

shipping container, PN 1211526, to minimize the risks of shipping damage. (Contact 

Arkwin Industries for the shipping container availability and pricing.) It is acceptable to 

re-use a shipping container that was delivered with a loan or advance exchange 

actuator. However, if the approved shipping container is not used, Arkwin will not be 

held accountable for any shipping damage.

Units should be returned to Arkwin Industries at the address that follows:

Product Support Operations

33 Sylvester Street

Westbury, NY 11590

(4) For Hamilton Sundstrand, operators should contact the Miramar Repair Station for 

scheduling information. For the Miramar Repair Station contact information, operators 

should use the Hamilton Sundstrand website at www.utcaerospacesystems.com. 

(Upon entering the website, select “Customer Service” followed by “Repair Services”. 

Click on the link to search for the UTC Aerospace Systems Repair Facility that can 

repair your part. You will be able to search based on the part number.)
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 9

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

(5) The operator will be subject to charges for work done beyond the scope of this bulletin. 

(This includes, but is not limited to, any parts that require repair or replacement 

because of wear, excessive corrosion, or mishandling.)

(6) Hamilton Sundstrand will supply the RAT nameplate required for accomplishment of 

this bulletin (in the shop) on a no-charge basis to operators and customer designees. 

The nameplate is currently available in limited quantities (refer to Table 6 of this bulletin 

for the parts breakdown). Operators and customer designees may place a single “nocharge” order to Hamilton Sundstrand. These orders should be forwarded to the 

assigned Hamilton Sundstrand Commercial Spares Administrator (or fax to +1-860-

660-7557, if the responsible Administrator is not known). In addition, the Hamilton 

Sundstrand website at www.utcaerospacesystems.com can be used to contact the 

Commercial Spares group. Upon entering the website, select “Customer Service” 

followed by “Spare Parts” for other contact and order processing options that are 

available. Orders must clearly reference fleet requirements; noting the service bulletin 

number, serial numbers of affected units, total quantity of parts, and anticipated 

incorporation schedule. Hamilton Sundstrand will acknowledge the order with an 

established delivery rate.

(7) Hamilton Sundstrand will supply the (temporary) actuator nameplates required for 

accomplishment of this bulletin (on the aircraft) on a no-charge basis to operators and 

customer designees. The nameplates are currently available in limited quantities (refer 

to Table 7 of this bulletin for the parts breakdown). Operators and customer designees 

may place a single “no-charge” order to Hamilton Sundstrand. These orders should be 

forwarded to the assigned Hamilton Sundstrand Commercial Spares Administrator (or 

fax to +1-860-660-7557, if the responsible Administrator is not known). In addition, the 

Hamilton Sundstrand website at www.utcaerospacesystems.com can be used to 

contact the Commercial Spares group. Upon entering the website, select “Customer 

Service” followed by “Spare Parts” for other contact and order processing options that 

are available. Orders must clearly reference fleet requirements; noting the service 

bulletin number, serial numbers of affected units, total quantity of parts, and anticipated 

incorporation schedule. Hamilton Sundstrand will acknowledge the order with an 

established delivery rate.

B. Industry Support Information

(1) Depending on the part number and serial number of the actuator, the industry support 

information is one of the following:

(a) For a RAT with an actuator that must be replaced, operators will receive a 

maximum labor allowance of 14.0 man-hours multiplied by the operator's current 

approved hourly rate for replacement of the actuator on the aircraft and for onwing testing. 

(b) For a RAT with an actuator that only requires identification, operators will receive 

the following: 

1 A maximum labor allowance of 1.0 man-hour multiplied by the operator's 

current approved hourly rate for identification of the actuator and the RAT. 
Original Issue Date: Jun 6/14 ERPS33T-29-7

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SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

2 An additional maximum labor allowance of 12.5 man-hours multiplied by the 

operator's current approved hourly rate if the actuator is installed on the 

aircraft and must be removed to view the actuator serial number.

C. Material Necessary For Each Unit

(1) Refer to Hamilton Sundstrand CMM 29-21-63 and Hamilton Sundstrand/Arkwin 

Industries CMM 29-21-04 for expendable parts information.

(2) Material to be Purchased Table 6

Table 6 Note 1: Actuators, PN 5917130-1 and PN 5917130-2 are interchangeable.

Table 6 Note 2: Hamilton Sundstrand will supply the noted part at no charge [refer to paragraph 

2.A.(6) of this bulletin for details]. The parts are only required if the RAT is in the 

shop. 

Table 6

New Parts Required for the RAT 

New Part Number Keyword

Old Part 

Number Qty Unit Price

Special 

Instructions/

Disposition

5917130-1 

5917130-2

Arkwin Actuator 5912536

5915769

1 (Note 1) Replace or 

modify and 

reidentify (refer 

to Table 10 of 

this bulletin)

771107-15 RAT Nameplate 771107-11

771107-12

771107-14

1 (Note 2) Remove old and 

install new or 

mark as 

necessary
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 11

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Table 7

Table 7 Note 1: Hamilton Sundstrand will supply the noted (temporary) nameplate at no charge 

[refer to paragraph 2.A.(7) of this bulletin for details]. The (temporary) nameplate 

is only required if the RAT or actuator is not in the shop. 

Table 8

Table 8 Note 1: Arkwin Industries or Hamilton Sundstrand will install the noted (permanent) 

nameplate at no charge [refer to paragraph 2.A.(1) of this bulletin for details]. The 

nameplate is only required if the RAT or actuator is in the shop. 

Table 7

New Parts Required for the Actuator (PN 5915769) (On the Aircraft) 

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

5917130-3 (Temporary)

Actuator 

Nameplate 

1211526-218 1 (Note 1) Install new (for an 

actuator to be 

identified as 

5917130-1)

5917130-4 (Temporary)

Actuator 

Nameplate

1211526-218 1 (Note 1) Install new (for an 

actuator to be 

identified as 

5917130-2)

Table 8

New Parts Required for the Actuator (In the Shop) 

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

1722421 (Permanent)

Actuator 

Nameplate

1211526-253

1211526-218

1 (Note 1) Remove old, 

mark and install 

new (for an 

actuator to be 

identified as 

5917130-2)
Original Issue Date: Jun 6/14 ERPS33T-29-7

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SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Table 9

Table 9 Note 1: An equivalent Skydrol® resistant coating may be used.

(3) Material Supplied by the Operator

(a) None

D. Material Necessary For Each Spare

(1) The same as the material necessary for each unit.

E. Reidentified Parts

(1) The following parts may be changed:

Table 10

Table 9

New Material Required 

Material Name and Number Source Use

Isopropyl Alcohol, 

TT-I-735 or ASTM D770

Commercially Available Use to clean the nameplate 

mounting area and 

nameplate

Clear Polyurethane Coating,

683-3-2/X-310A 

(Note 1)

AKZO Coatings Inc. 

(CAGE Code 98502)

If necessary, use to seal the 

edges of the nameplate

Table 10

Reidentified Parts 

Old Part Number Keyword New Part Number

5912536

(Arkwin PN 1211526-002)

Actuator 5917130-2

5915769 

(Arkwin PN 1211526-003)

Actuator (Refer to Table 2 of this bulletin)
Original Issue Date: Jun 6/14 ERPS33T-29-7

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SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

(2) Incorporation of this bulletin advances the RAT part numbers as follows (refer to 

Table 11 and paragraph 3.J. of this bulletin). 

Table 11

F. Tooling - Price and Availability

(1) No tooling other than that required for shop maintenance of the RAT is required to do 

this modification.

Table 11

RAT Part Number Changes 

Old Part Number: New Part Number:

772722H

772722J 772722M

772722L
Original Issue Date: Jun 6/14 ERPS33T-29-7

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SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

3. ACCOMPLISHMENT INSTRUCTIONS

A. General

CAUTION: THE RAT CONTAINS DESIGN CRITICAL CHARACTERISTICS, 

PROCESSES, AND PROCEDURES. THE DESIGN CRITICAL 

CHARACTERISTICS ARE IDENTIFIED WITH THE SYMBOL >>DCC<<. 

REFER TO THE INTRODUCTION SECTION OF HAMILTON SUNDSTRAND 

CMM 29-21-63 FOR A COMPLETE EXPLANATION OF DESIGN CRITICAL 

CHARACTERISTICS.

(1) The facility performing the work (user) should obtain the material safety data sheets 

[Occupational Safety and Health Act (OSHA) Form 20 or equivalent] from the 

manufacturers or suppliers of materials to be used. The user must become completely 

familiar with the manufacturer/supplier information and adhere to the procedures, 

recommendations, warnings, and cautions of the manufacturer/supplier for the safe 

use, handling, storage, and disposal of these materials. The user should also read the 

long version of the warnings contained in this bulletin. The long version warnings are 

contained in Hamilton Sundstrand Warnings Registry SPM 20-00-04 available free of 

charge to all organizations that are on distribution for this bulletin. The Warnings 

Registry SPM 20-00-04 is also available at myhs.hamiltonsundstrand.com.

B. Check (Actuator Serial Number)

(1) View the serial number on the actuator nameplate (refer to Figure 1 of this bulletin for 

the location of the nameplate).

(a) If necessary, remove the actuator from the RAT to view the actuator serial number 

(refer to paragraph 3.C. or 3.D. of this bulletin). 

(2) If the actuator requires only identification (the intent of this bulletin has been 

incorporated) (refer to Table 2 of this bulletin), proceed to paragraph 3.F. of this 

bulletin. 

(3) If the actuator requires modification (refer to paragraph 1.A.(2) of this bulletin), do the 

following:

(a) If installed, remove the actuator from the RAT (refer to paragraph 3.C. or 3.D. of 

this bulletin) and then proceed to paragraph 3.E. of this bulletin.
Original Issue Date: Jun 6/14 ERPS33T-29-7

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SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

C. Actuator Removal (On the Aircraft)

(1) If the RAT is on the aircraft, remove the actuator, PN 5912536 (Arkwin 

PN 1211526-002) or PN 5915769 (Arkwin PN 1211526-003), from the RAT (refer to 

the applicable Airbus AMM). 

D. Disassembly (Off the Aircraft)

(1) If the RAT is off the aircraft, remove the actuator (265 or -265A, IPL Figure 1, Hamilton 

Sundstrand CMM 29-21-63) from the RAT (refer to CMM 29-21-63, DISASSEMBLY). 

E. Actuator Modification 

NOTE: The actuator [refer to paragraph 1.A.(2) of this bulletin] should be returned to 

Arkwin Industries or Hamilton Sundstrand for modification (refer to 

paragraph 2.A. of this bulletin for details). 

(1) If the actuator is part number 5912536 (Arkwin PN 1211526-002), if the actuator serial 

number is not listed in Table 2 of this bulletin, or if the actuator nameplate is missing, 

Arkwin Industries or Hamilton Sundstrand will modify units that are in serviceable 

condition (refer to Hamilton Sundstrand/Arkwin Industries CMM 29-21-04, 

APPENDIX A), except as follows:

(a) Use the new nameplate (PN 1722421) in place of the nameplate (-450, 

IPL Figure 1001, CMM 29-21-04). 

(b) Change the Hamilton Sundstrand part number of the actuator from 5912536 to 

5917130-2.

(2) If the actuator is part number 5915769 (Arkwin PN 1211526-003), Arkwin Industries or 

Hamilton Sundstrand will shim the solenoids of units that are in serviceable condition, 

test the actuator and identify the actuator (refer to Hamilton Sundstrand/Arkwin 

Industries CMM 29-21-04, APPENDIX A), except as follows:

(a) If marked with ink on the housing, remove the Hamilton Sundstrand part number 

5915769, Arkwin part number 1211526-003, and amendment letter “D” markings 

from the housing. 

(b) Use the new nameplate (PN 1722421) in place of the nameplate (-450A, 

IPL Figure 1001, CMM 29-21-04). 

(c) Change the Hamilton Sundstrand part number of the actuator from 5915769 to 

5917130-2.
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 16

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

F. Actuator Identification 

(1) Identify the actuator as follows and then proceed to paragraph 3.G. of this bulletin.

NOTE: Refer to Table 2 of this bulletin to determine if the actuator should be 

identified as part number 5917130-1 or 5917130-2. 

(a) If the actuator is installed on the aircraft, do the following: 

1 Install a new (temporary) nameplate on the actuator housing as follows (refer 

to Figure 1 of this bulletin for the location to install the nameplate).

- Use nameplate, PN 5917130-3, for actuators to be identified as part 

number 5917130-1.

- Use nameplate, PN 5917130-4, for actuators for actuators to be identified 

as part number 5917130-2. 

WARNING: USE ISOPROPYL ALCOHOL, TT-I-735 OR ASTM D770, 

CORRECTLY. ISOPROPYL ALCOHOL IS FLAMMABLE, 

EXPLOSIVE, AND A MILD POISON. IT CAN HAVE A BAD 

EFFECT ON YOUR HEALTH OR SAFETY. BEFORE YOU 

USE THE ALCOHOL, GET THE MATERIAL SAFETY DATA 

SHEET FROM THE MANUFACTURER OR SUPPLIER OF 

THE MATERIAL AND READ IT CAREFULLY. READ THE 

DETAILED WARNING, W0046SE, IN THE WARNING 

REGISTRY SPM 20-00-04. BEFORE YOU USE THE 

ALCOHOL, PUT ON CHEMICAL-SPLASH GOGGLES. MAKE 

SURE THAT YOU HAVE SUFFICIENT AIRFLOW TO KEEP 

THE ALCOHOL FUMES BELOW THE MATERIAL SAFETY 

DATA SHEET LIMIT.

a Use a clean, lint-free cloth, soaked in isopropyl alcohol (TT-I-735 or 

ASTM D770), to clean the surface where the new nameplate will be 

installed.

b Let the cleaned surface air dry for 10 minutes minimum.

c Remove the paper backing and install the new nameplate. Press firmly 

to remove any air pockets.
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 17

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

WARNING: USE ISOPROPYL ALCOHOL, TT-I-735 OR ASTM D770, 

CORRECTLY. ISOPROPYL ALCOHOL IS FLAMMABLE, 

EXPLOSIVE, AND A MILD POISON. IT CAN HAVE A BAD 

EFFECT ON YOUR HEALTH OR SAFETY. BEFORE YOU 

USE THE ALCOHOL, GET THE MATERIAL SAFETY DATA 

SHEET FROM THE MANUFACTURER OR SUPPLIER OF 

THE MATERIAL AND READ IT CAREFULLY. READ THE 

DETAILED WARNING, W0046SE, IN THE WARNING 

REGISTRY SPM 20-00-04. BEFORE YOU USE THE 

ALCOHOL, PUT ON CHEMICAL-SPLASH GOGGLES. MAKE 

SURE THAT YOU HAVE SUFFICIENT AIRFLOW TO KEEP 

THE ALCOHOL FUMES BELOW THE MATERIAL SAFETY 

DATA SHEET LIMIT.

d Use a clean lint-free cloth, soaked with isopropyl alcohol (TT-I-735 or 

ASTM D770), to clean the surface of the new nameplate and the 

surrounding mounting area.

WARNING: COATING, POLYURETHANE, CLEAR, IS TOXIC AND 

FLAMMABLE. DO NOT BREATHE VAPORS. USE IN WELLVENTILATED AREA FREE FROM SPARKS, FLAME, OR HOT 

SURFACES. PUT ON SPLASH GOGGLES, SOLVENTRESISTANT GLOVES, AND OTHER PROTECTIVE GEAR. IN 

CASE OF EYE CONTACT, FLUSH WITH WATER FOR 15 

MINUTES AND SEEK MEDICAL ATTENTION. IN CASE OF 

SKIN CONTACT, WASH WITH SOAP AND WATER.

e Apply clear polyurethane coating (PN 683-3-2/X-310A or equivalent) on 

the edges of the nameplate. 

f Let the coating cure according to the manufacturer’s instructions. 

NOTE: The next time the actuator is in the shop, the temporary 

nameplate must be replaced with a permanent nameplate 

(PN 1722421). 

2 Mark out the part numbers on the existing actuator nameplate (refer to 

Figure 1 of this bulletin for the location of the existing nameplate). 

(b) If the actuator is in the shop, remove the existing nameplate (-450 or -450A, 

IPL Figure 1001, CMM 29-21-04) and install a new (permanent) nameplate 

(PN 1722421) as follows (refer to SPM 20-00-00, ASSEMBLY, and Figure 1 of 

this bulletin). 

1 Mark the number 2 after the part number 5917130- on the new nameplate 

(PN 1722421). 

2 If necessary, transfer any pertinent information from the existing nameplate 

(-450 or -450A) to the new nameplate (PN 1722421) before replacement. 
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 18

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

G. Assembly (Off the Aircraft)

(1) If the RAT is off the aircraft, install (if removed) the actuator (PN 5917130-1 or 

PN 5917130-2) on the RAT (refer to Hamilton Sundstrand CMM 29-21-63, 

ASSEMBLY). 

H. Actuator Installation (On the Aircraft)

(1) If the RAT is on the aircraft, install (if removed) the actuator (PN 5917130-1 or 

PN 5917130-2) on the RAT (refer to the applicable Airbus AMM). 

I. Test 

NOTE: No test is necessary if the intent of this bulletin had previously been 

incorporated and the actuator was not removed from the RAT to view the 

actuator serial number.

(1) If the RAT is in the shop, do a test of the RAT (refer to Hamilton Sundstrand 

CMM 29-21-63, TESTING AND FAULT ISOLATION). 

(2) If the RAT is on the aircraft, do a test of the RAT (automatic and manual deployment) 

(refer to the applicable Airbus AMM). 

(3) If the actuator was replaced while the RAT was off the aircraft, test the RAT upon 

installation on the aircraft (refer to the applicable AMM). 

J. RAT Identification (On the Aircraft)

NOTE: Replacement of the RAT nameplate on the aircraft should be avoided. If a 

nameplate is not installed correctly (using the instructions in the CMM), it can 

come loose. This can result in a missing nameplate. 

NOTE: If the RAT nameplate is missing, operators should contact Hamilton 

Sundstrand for a replacement part. 

NOTE: If additional information is required to mark the RAT nameplate, operators 

should contact the following Hamilton Sundstrand Service Engineer:

Greg Kuczek

Phone: +1-815-226-6581

Fax: +1-860-660-4995

E-Mail: gregory.kuczek@utas.utc.com
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 19

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

(1) If the RAT is on the aircraft, identify the RAT as follows:

(a) Use a ball point pen (or an equivalent permanent marking method) to change the 

part number (of the RAT) on the RAT nameplate as shown in Table 12 of this 

bulletin. (Refer to Figure 1 of this bulletin for the location of the RAT nameplate). Table 12

(b) Put a mark through the part number bar code on the RAT nameplate.

(c) Use a ball point pen (or an equivalent permanent marking method) to mark the 

symbol 29-7 on the RAT nameplate. (Refer to Figure 1 of this bulletin for the 

location of the nameplate).

NOTE: The next time the modified RAT is in the shop, the existing 

nameplate must be replaced with a new nameplate (refer to 

Table 13 of this bulletin and Hamilton Sundstrand CMM 29-21-63, 

REPAIR).

K. RAT Identification (In the Shop)

(1) Identify the RAT as follows (refer to SPM 20-00-00, ASSEMBLY): 

(a) Replace the nameplate as follows: 

NOTE: Incorporation of this bulletin advances the RAT part number (refer 

to Table 13 of this bulletin).

NOTE: Transfer any pertinent information from the existing nameplate to 

a new nameplate (refer to Table 13 of this bulletin). 

1 Use a ball point pen (or an equivalent permanent marking method) to mark 

the symbol 29-7 on the RAT nameplate. 

NOTE: Replace the existing nameplate with the new nameplate (refer to 

Table 13 of this bulletin and CMM 29-21-63, REPAIR). 

Table 12

RAT Part Number Changes 

Old Part Number: New Part Number:

772722H

772722J 772722M

772722L
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 20

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Table 13

Table 13

RAT Identification 

From

Part Number

To

Part Number

Existing 

Nameplate 

Part Number

New 

Nameplate 

Part Number

772722H

772722M

771107-11 (-405E, IPL Figure 1)

772722J 771107-12 (-405F) 771107-15

772722L 771107-14 (-405G)
Original Issue Date: Jun 6/14 ERPS33T-29-7

Page 21

SERVICE BULLETIN

Hamilton Sundstrand Corporation, a UTC Aerospace Systems Company

UTC AEROSPACE SYSTEMS PROPRIETARY - Subject to the restriction on the title or cover page.

Subject to the EAR - See the Title, First, or Cover Page for more information.

Figure 1

Figure 1

Actuator and RAT Identification

SB-ERPS33T297-118097

ARKWIN

ACTUATOR

A

A

VIEW A-A

(ACTUATOR SHOWN REMOVED)

LOCATION TO INSTALL (TEMPORARY)

ACTUATOR NAMEPLATE

B

B

VIEW B-B

(ACTUATOR SHOWN REMOVED)

RAT NAMEPLATE

(SHOWN REMOVED)

LOCATION OF (EXISTING) 

ACTUATOR NAMEPLATE