SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 1 of 24

EMERGENCY HYDRAULIC POWER - RAM AIR TURBINE MODULE -CHECK/REPLACE PUMP

© 2012 Hamilton Sundstrand Corporation

PROPRIETARY

THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE THE PROPERTY OF HAMILTON SUNDSTRAND 

CORPORATION (HSC). RECIPIENT AGREES TO HOLD ALL SUCH INFORMATION IN CONFIDENCE AND AGREES IT SHALL BE 

USED ONLY FOR RECIPIENT'S INTERNAL PURPOSES TO MAINTAIN RECIPIENT'S EQUIPMENT OR AS MAY OTHERWISE BE 

PERMITTED IN AN APPLICABLE AGREEMENT BETWEEN RECIPIENT AND HSC. THIS DOCUMENT AND THE INFORMATION 

CONTAINED HEREIN SHALL NOT BE USED FOR ANY OTHER PURPOSE, INCLUDING THE CREATION, MANUFACTURE, 

DEVELOPMENT, OR DERIVATION OF ANY REPAIRS, MODIFICATIONS, SPARE PARTS, DESIGN, OR CONFIGURATION CHANGES, 

OR TO OBTAIN FAA OR ANY OTHER GOVERNMENT OR REGULATORY APPROVAL FOR SAME. RECIPIENT AGREES NOT TO 

DISCLOSE SUCH INFORMATION TO ANY THIRD PARTY, EXCEPT AS MAY OTHERWISE BE PROVIDED FOR IN AN APPLICABLE 

AGREEMENT BETWEEN RECIPIENT AND HSC. COPYING OR DISCLOSURE OF THIS DOCUMENT AND THE INFORMATION 

CONTAINED HEREIN BY ANYONE WITHOUT HSC'S PRIOR WRITTEN PERMISSION IS NOT AUTHORIZED AND MAY RESULT IN 

CRIMINAL AND/OR CIVIL LIABILITY.

INFORMATION SUBJECT TO EXPORT CONTROL LAWS

THE TECHNICAL DATA IN THIS DOCUMENT (OR FILE) IS CONTROLLED FOR EXPORT UNDER THE EXPORT ADMINISTRATION 

REGULATIONS (EAR), 15 CFR PARTS 730-774. VIOLATIONS OF THESE LAWS MAY BE SUBJECT TO FINES AND PENALTIES 

UNDER THE EXPORT ADMINISTRATION ACT.

EAR EXPORT CLASSIFICATION: ECCN 9E991

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 Turbine (RAT) Modules, Model ERPS06M, all serial 

numbers, used on Airbus A330 and A340 aircraft, that are listed below:

Part Number 

766351 770952B

768084 1702934

770379 1702934A

770952 1702934B

770952A
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

B. Concurrent Requirements

(1) If applicable, the Hamilton Sundstrand service bulletins that follow must be done on the 

RAT module prior to, or in conjunction with, this bulletin: 

- ERPS06G-29-6 (Replace Balance Weight/Washer Screws) 

- ERPS06M-29-13 (Actuator Coil Spring)

- ERPS06M-29-18 (Modify Actuator).

(2) Hamilton Sundstrand Service Bulletin 5909522-29-1 (Anti-Stall Valve Check) must be 

done prior to, or in conjunction with, this bulletin.

NOTE: For a suspect hydraulic pump, the Hamilton Sundstrand Service Bulletin 

5909522-29-1 will be done by Parker Hannifin GmbH (during incorporation 

of Parker Hannifin GmbH Service Bulletin 42079-29-425). 

C. Reason

(1) For RAT modules that contain a suspect hydraulic pump, analysis has determined that 

the potential exists for insufficient engagement margin of the hydraulic pump inlet 

impeller hex drive shaft (internal). This could possibly cause disengagement of the inlet 

impeller and result in failure of the RAT hydraulic pump to provide full hydraulic 

pressure. Replacement of the suspect hydraulic pump (with a pump having an inlet 

impeller with a deeper hex drive socket together with a matched-length hex drive shaft) 

will ensure adequate engagement of the hex drive shaft and eliminate the possibility of 

disengagement of the inlet impeller. Incorporation of this bulletin will provide improved 

reliability of the RAT module. 

(2) For RAT modules that do not contain a suspect hydraulic pump, incorporation of this 

bulletin (to reidentify the hydraulic pump) will let the RAT module advance to a new part 

number. 

(3) This service bulletin introduces the following new Hamilton Sundstrand part number 

RAT modules. These RAT modules are equipped with the Parker hydraulic pump 

PN 5916485 (which has been reidentified) or the Parker hydraulic pump PN 5916430 

(which has been modified). 

766351A

768084A

770379A

770952C

770952D

770952E

1702934C

1702934D
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

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Use or disclosure of this data is subject to restrictions on the front page of this document.

D. Description

(1) If the hydraulic pump is suspect, this bulletin gives the instructions to replace the 

hydraulic pump, identify the RAT module, and test the RAT module. 

(2) If the hydraulic pump is not suspect, this bulletin gives the instructions to identify the 

hydraulic pump and the RAT module. 

E. Compliance

(1) Incorporation of this service bulletin 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.

G. Manpower

(1) If the hydraulic pump is suspect, approximately 14.0 man-hours are required to replace 

the hydraulic pump, identify the RAT module, and test the RAT module. 

(2) If the hydraulic pump is not suspect, approximately 1.0 man-hour is required to identify 

the hydraulic pump and the RAT module.

H. Weight and Balance

(1) None

I. Electrical Load Data

(1) Not changed 

J. Software Accomplishment Summary

(1) Not Applicable 
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

K. References

(1) Hamilton Sundstrand Component Maintenance Manual (CMM) 29-21-31

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

(3) Applicable Airbus Aircraft Maintenance Manual (AMM)

(4) Hamilton Sundstrand Engineering Changes 12A314, 12B559, and 12B977

(5) Parker Hannifin GmbH Service Bulletin 42079-29-425

(6) Equipment Definition Evolution Sheet (EDES) A334RAT05-004

(7) This service bulletin is subject of Aircraft Modification Number 202537 D50553 

(classified minor) and is covered by Aircraft Service Bulletin Numbers A330-29-3122 

and A340-29-4093. 

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

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

modification and, if applicable, its aircraft service bulletin are approved.

L. Other Publications Affected

(1) Hamilton Sundstrand CMM 29-21-31 and Parker Hannifin GmbH CMM 29-21-34 will 

be revised to incorporate this bulletin.

M. Interchangeability or Intermixability of Parts

(1) Refer to the Aircraft Service Bulletin Numbers A330-29-3122 and A340-29-4093 for 

interchangeability or intermixability of parts.
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 5

Use or disclosure of this data is subject to restrictions on the front page of this document.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) In order to agree on a well-organized upgrade process, operators should contact the 

Parker Hannifin GmbH Customer Support Organization in Germany before removing 

a suspect hydraulic pump.

(2) The contact information and shipment address for Parker Hannifin GMBH is as follows 

(also refer to Parker Hannifin GMBH Service Bulletin 42079-29-425): 

NOTE: Any e-mail messages should be sent to both contact persons listed below.

Contact 1: 

Claudia Schorsch, Team Leader Customer Service Administration

E-mail: cschorsch@parker.com

Telephone: +49 6134 204 217

Fax: +49 6134 204 188

Contact 2: 

Wolfgang Schlesag, Business Development Manager

E-mail: wschlesag@parker.com

Telephone: +49 6134 204 227

Fax: +49 6134 204 188 

Shipment Address:

Parker Hannifin GmbH

Service Center Wiesbaden

Lorenz-Schott-Strasse 9

D-55252 Mainz-Kastel

Germany

(3) If the hydraulic pump is not suspect, the hydraulic pump identification plate (refer to 

Table 1 and Table 3 of this bulletin) will be provided by Parker Hannifin GmbH. 

Operators should place a “no-charge” purchase order to Parker Hannifing GmbH, that 

includes sufficient quantities of identification plates for their entire fleet (with the 

understanding that not all identification plates may be required). 

(4) If the hydraulic pump is suspect, a limited number of hydraulic pumps will be placed in 

a rotable pool for operator use. These will be available to operators for exchange, 

based upon availability. In addition, the A330/A340 RAT pump replacement parts 

kit 914-157 (refer to Table 2 and Table 4 of this bulletin) will be provided with the 

rotable unit. 

Requests for rotable units should be sent (along with fleet data) in an e-mail message 

to Hamilton Sundstrand Retrofit Management as follows: 

To: Matt Wheeler (matt.wheeler@hs.utc.com)

Subject: SB ERPS06M-29-19 Rotable Pool Request
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

(5) Hamilton Sundstrand will supply the replacement parts required for accomplishment of 

this bulletin on a no-charge basis until October 27, 2014. The replacement parts are 

currently available in limited quantities. Operators approved by Hamilton Sundstrand 

to perform the modification of units at their facility should place a single “no-charge” 

order to Hamilton Sundstrand. Operators can forward these orders to their assigned 

Hamilton Sundstrand Commercial Spares Administrator (or fax to +1-815-226-2624, if 

the responsible Administrator is not known). In addition, operators can also use the 

Hamilton Sundstrand website at www.hamiltonsundstrand.com to contact the 

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

followed by “Commercial Spares” for other contact and order processing options that 

are available. 

(a) The two methods for establishing order quantities based on available fleet records 

are listed below. In each case, Hamilton Sundstrand will acknowledge the 

operator order with an established delivery rate.

1 For operators who can establish a listing of affected units in their fleet 

through the review of records, Hamilton Sundstrand requests that a single 

purchase order be submitted for the total parts requirement. To minimize 

processing delays, orders must clearly reference the service bulletin 

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

anticipated incorporation schedule. [To calculate the total quantity of parts to 

order, refer to Table 1, Table 2, Table 3, or Table 4 of this bulletin for the 

parts breakdown on a per unit basis.]

If, at some point in the future, an operator finds that additional quantities of 

parts are required, they should contact Hamilton Sundstrand with the details 

so that arrangements can be made to provide them with the additional 

quantities. 

2 For operators who cannot establish the total fleet requirements through the 

review of records, Hamilton Sundstrand requests that an initial purchase 

order be submitted to support 25 percent of their operating fleet or two 

aircraft, whichever is greater. This will allow an operator to have parts 

available on shelf in the event that an affected unit is found while performing 

inspections in accordance with this service bulletin. To minimize processing 

delays, orders must clearly reference the service bulletin number and 

quantity of parts. [To calculate the total quantity of parts to order, refer to 

Table 1, Table 2, Table 3, or Table 4 of this bulletin for the parts breakdown 

on a per unit basis.]

If the initial quantity of parts provided is used and aircraft remain to be 

inspected, operators should contact Hamilton Sundstrand with the details so 

that arrangements can be made to provide additional parts.
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 7

Use or disclosure of this data is subject to restrictions on the front page of this document.

B. Industry Support Information

(1) If the hydraulic pump is suspect:

(a) Hamilton Sundstrand will give a maximum labor allowance of 14.0 man-hours 

multiplied by the operator's current approved hourly rate for replacement of the 

pump on the aircraft and for on-wing testing. The labor allowance will expire 

October 27, 2014.

(2) If the hydraulic pump is not suspect: 

(a) Hamilton Sundstrand will also give a maximum labor allowance of 1.0 man-hour 

multiplied by the operator's current approved hourly rate for accomplishment of 

this bulletin. The labor allowance will expire October 27, 2014.

(3) Operators should forward a claim for labor reimbursement to their assigned Hamilton 

Sundstrand Rockford Warranty Administrator. If the responsible Administrator is not 

known, the claim should be mailed to Warranty Administration, 4747 Harrison Ave., 

Rockford, IL 61125, USA, MS 106-6. The claim should reference the bulletin number, 

serial numbers modified, date modified, total hours, and approved labor rate.

(4) Hamilton Sundstrand will incorporate this modification into returned RAT modules at 

no charge until October 27, 2014. Operators should contact the Rockford Plant 6 

Repair Station for scheduling information. For the Rockford Plant 6 Repair Station 

contact information, operators should use the Hamilton Sundstrand website at 

www.hamiltonsundstrand.com. (Upon entering the website, select “Customer Service” 

followed by “Worldwide Repair Services”. Then, select the link for the Rockford Plant 6 

Repair Station.)

C. Material Necessary For Each Unit

(1) Refer to Hamilton Sundstrand CMM 29-21-31 for expendable parts information.

(2) Material to be Purchased 
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 1

Table 1 Note 1: Parker Hannifin GmbH will provide the noted part at no charge (refer to paragraph 

2.A. of this bulletin for details). 

Table 1 Note 2: The noted material is commercially available. 

Table 1

New Parts Required (On the Aircraft, Non-Suspect Hydraulic Pump)

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

48438 (Parker PN) Identification 

Plate

None 1 (Note 1) If the hydraulic 

pump is not 

suspect, install 

new

MS20995C32 Safety Wire None AR (Note 2) If the hydraulic 

pump is not 

suspect, use 

to install the 

hydraulic 

pump 

identification 

plate 
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 9

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 2

Table 2 Note 1: The noted parts are contained in the noted A330/A340 RAT pump replacement 

parts kit 914-157. The parts kit will be provided with the rotable unit (refer to 

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

Table 2

New Parts Required (On the Aircraft, Suspect Hydraulic Pump) 

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

5916430 Hydraulic Pump 5909522 1 (Note 1) If suspect, 

remove old, 

install new

Same O-Ring NAS1612-20 2 (Note 1) If installed, 

remove old, 

install new

Same Backup Ring MS28774-023 4 (Note 1) Remove old, 

install new

Same O-Ring NAS1611-023 2 (Note 1) Remove old, 

install new

Same Backup Ring MS28774-021 4 (Note 1) Remove old, 

install new

Same O-Ring NAS1611-021 2 (Note 1) Remove old, 

install new

Same Backup Ring MS28774-014 4 (Note 1) Remove old, 

install new

Same O-Ring NAS1611-014 2 (Note 1) Remove old, 

install new

Same O-Ring NAS1611-042 1 (Note 1) Remove old, 

install new

5912160 Radial Seal 5912160

5910299

1 (Note 1) Remove old, 

install new

914-157 A330/A340 

RAT Pump 

Replacement 

Parts Kit

None 1 (Note 1) Install new
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 10

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 3

Table 3

New Parts Required (In the Shop, Non-Suspect Hydraulic Pump) 

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

48438 (Parker PN) Identification 

Plate

None 1 (Note 1) If the hydraulic 

pump is not 

suspect, install 

new

MS20995C32 Safety Wire None AR (Note 2) If the hydraulic 

pump is not 

suspect, use 

to install the 

hydraulic 

pump 

identification 

plate 

Same

(Note 3)

Modification 

Plate

761251 1 (Note 4) Remove old 

and install new 

or mark as 

necessary

1700217-8

(Note 3)

Identification 

Plate

1700217-1 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 770379) or 

mark as 

necessary

1700217-9

(Note 3)

Identification 

Plate

1700217-2 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 770952) or 

mark as 

necessary

1700217-10

(Note 3)

Identification 

Plate

1700217-3 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 770952A) 

or mark as 

necessary
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 11

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 3 Note 1: Parker Hannifin GmbH will provide the noted part at no charge (refer to paragraph 

2.A. of this bulletin for details). 

Table 3 Note 2: The noted material is commercially available. 

Table 3 Note 3: The noted modification plate and identification plates are only required if the RAT 

module is in the shop. 

Table 3 Note 4: Hamilton Sundstrand will provide or install the noted parts at no charge (refer to 

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

1700217-11

(Note 3)

Identification 

Plate

1700217-4 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 770952B) 

or mark as 

necessary

1700217-12

(Note 3)

Identification 

Plate

1700217-5 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 1702934) 

or mark as 

necessary

1700217-13

(Note 3)

Identification 

Plate

1700217-6 1 (Note 4) Remove old 

and install new 

(for RAT 

module 

PN 1702934A 

and 

PN 1702934B) 

or mark as 

necessary

Table 3

New Parts Required (In the Shop, Non-Suspect Hydraulic Pump) (Continued)

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 4

Table 4

New Parts Required (In the Shop, Suspect Hydraulic Pump) 

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition

5916430 Hydraulic Pump 5909522 1 (Note 1) If suspect, 

remove old, 

install new

Same O-Ring NAS1612-20 2 (Note 1)

(Note 2)

If installed, 

remove old, 

install new

Same Backup Ring MS28774-023 4 (Note 1)

(Note 2)

Remove old, 

install new

Same O-Ring NAS1611-023 2 (Note 1)

(Note 2)

Remove old, 

install new

Same Backup Ring MS28774-021 4 (Note 1)

(Note 2)

Remove old, 

install new

Same O-Ring NAS1611-021 2 (Note 1)

(Note 2)

Remove old, 

install new

Same Backup Ring MS28774-014 4 (Note 1)

(Note 2)

Remove old, 

install new

Same O-Ring NAS1611-014 2 (Note 1)

(Note 2)

Remove old, 

install new

Same O-Ring NAS1611-042 1 (Note 1)

(Note 2)

Remove old, 

install new

5912160 Radial Seal 5912160

5910299

1 (Note 1)

(Note 2)

Remove old, 

install new

914-157 A330/A340 

RAT Pump 

Replacement 

Parts Kit

None 1 (Note 2) Install new

Same

(Note 3)

Modification 

Plate

761251 1 (Note 1) Remove old 

and install new 

or mark as 

necessary
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 13

Use or disclosure of this data is subject to restrictions on the front page of this document.

1700217-8

(Note 3)

Identification 

Plate

1700217-1 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 770379) or 

mark as 

necessary

1700217-9

(Note 3)

Identification 

Plate

1700217-2 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 770952) or 

mark as 

necessary

1700217-10

(Note 3)

Identification 

Plate

1700217-3 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 770952A) 

or mark as 

necessary

1700217-11

(Note 3)

Identification 

Plate

1700217-4 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 770952B) 

or mark as 

necessary

1700217-12

(Note 3)

Identification 

Plate

1700217-5 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 1702934) 

or mark as 

necessary

Table 4

New Parts Required (In the Shop, Suspect Hydraulic Pump) (Continued)

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 14

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

Table 4 Note 1: Hamilton Sundstrand will provide or install the noted parts at no charge (refer to 

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

Table 4 Note 2: The noted parts are contained in the A330/A340 RAT pump replacement parts 

kit 914-157. 

Table 4 Note 3: The noted modification plate and identification plates are only required if the RAT 

module is in the shop. 

(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) If the hydraulic pump is not suspect, it may be reidentified (refer to Table 5 of this 

bulletin): Table 5

1700217-13

(Note 3)

Identification 

Plate

1700217-6 1 (Note 1) Remove old 

and install new 

(for RAT 

module 

PN 1702934A 

and 

PN 1702934B) 

or mark as 

necessary

Table 5

Reidentified Parts 

Old Part Number Keyword New Part Number

5909522 Hydraulic Pump 5916485

Table 4

New Parts Required (In the Shop, Suspect Hydraulic Pump) (Continued)

New 

Part Number Keyword

Old 

Part Number Qty Unit Price

Special 

Instructions/

Disposition
SERVICE BULLETIN

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Use or disclosure of this data is subject to restrictions on the front page of this document.

(2) Incorporation of this bulletin advances the RAT module part number as shown in 

Table 6 of this bulletin [refer to paragraph 3.F. (On the Aircraft) or paragraph 3.G. (In 

the Shop) of this bulletin]. Table 6

Table 6 Note 1: Hamilton Sundstrand Service Bulletin ERPS06M-29-18 (which must be done prior 

to, or in conjunction with, this bulletin for RAT module PN 1702934A) advances 

the RAT module part number from 1702934A to 1702934B. 

F. Tooling - Price and Availability

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

to do this modification.

Table 6

Rat Module Part Numbers 

From To

766351 766351A

768084 768084A

770379 770379A

770952 770952C

770952A 770952D

770952B 770952E

1702934 1702934C

1702934A (Note 1)

1702934B 1702934D
Original Issue Date: Aug 6/12 ERPS06M-29-19

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SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

3. ACCOMPLISHMENT INSTRUCTIONS

A. General

CAUTION: THE RAT MODULE 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 29-21-31 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 341-006 available free of charge 

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

341-006 is also available at myhs.hamiltonsundstrand.com.

(2) A unit modified according to this service bulletin might be returned to the shop for 

maintenance or repair before the new or modified part numbers or procedures in this 

bulletin are incorporated into the applicable CMM.

Until this service bulletin is incorporated into the CMM, operators are allowed to 

disassemble, clean, check, repair, assemble, and test the unit according to the 

applicable CMM, using the new or modified part numbers or procedures in this bulletin.

After this service bulletin is incorporated into the CMM, the CMM procedures will 

supersede this bulletin.

B. Check

(1) Make sure the Hamilton Sundstrand service bulletins that follow have been 

incorporated, if applicable: 

- ERPS06G-29-6 (Replace Balance Weight/Washer Screws) 

- ERPS06M-29-13 (Actuator Coil Spring)

- ERPS06M-29-18 (Modify Actuator).

(2) If the hydraulic pump is not suspect, make sure the Hamilton Sundstrand Service 

Bulletin 5909522-29-1 (Anti-Stall Valve Check) has been incorporated, if applicable.

NOTE: For a suspect hydraulic pump, Hamilton Sundstrand Service Bulletin 

5909522-29-1 will be done by Parker Hannifin GmbH (during incorporation 

of Parker Hannifin GmbH Service Bulletin 42079-29-425). 
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 17

Use or disclosure of this data is subject to restrictions on the front page of this document.

(3) Do a check for a suspect hydraulic pump (280, IPL Figure 1, CMM 29-21-31) or (240, 

IPL Figure 1A) as follows: 

(a) Review the list of suspect hydraulic pump serial numbers as shown in Table 7 of 

this bulletin. (You may also refer to Appendix 1 of Parker Hannifin GmbH Service 

Bulletin 42079-29-425.) Table 7

(b) If the hydraulic pump serial number is suspect, do the following: 

1 Replace the hydraulic pump (proceed to paragraph 3.C. of this bulletin).

2 Return the suspect pump to Parker Hannifin GmbH [refer to paragraph 

2.A.(2) of this bulletin for the contact information and shipment address]. 

(c) If the hydraulic pump serial number is not suspect, do the following steps.

1 On the hydraulic pump identification plate, use a permanent marking method 

to completely obliterate the existing Hamilton Sundstrand part number 

(5909522) and the Parker part number (4207902).

Table 7

Suspect Hydraulic Pump Serial Numbers 

BP 193, BP 194, BP 195, BP 196, BP 531, BP 532, BP 533, BP 534, BP 535, BP 537, BP 538, 

BP 539, BP 540, BR 453, BR 454, BR 455, BR 456, BR 457, BR 458, BR 459, BR 460, BR 461, 

BR 462, BR 463, BR 464, BR 465, BR 466, BR 467, BR 468, BR 469, BR 470, BR 471, BR 472, 

BT 924, BT 925, BT 926, BT 927, BT 929, BT 930, BT 931, BU 648, BU 649, BU 650, BU 651, 

BU 991, BU 992, BU 993, BU 994, BU 995, BU 996, BU 997, BU 998, BU 999, CA 414, CA 415, 

CA 416, CA 417, CA 418, CA 419, CA 420, CA 421, CA 422, CA 423, CA 424, CA 425, CA 426, 

CB 372, CB 373, CB 374, CB 375, CB 918, CB 919, CB 920, CB 921, CC 456, CC 457, CC 458, 

CC 459, CC 460, CC 461, CC 462, CC 463, CC 464, CC 465, CC 466, CD 322, CD 323, CD 324, 

CD 325, CD 475, CD 476, CD 477, CD 478, CD 479, CD 480, CD 481, CD 482, CD 483, CD 484, 

CD 485, CD 486, CD 487, CE 932, CE 933, CE 934, CE 935, CE 936, CE 937, CE 938, CE 939, 

CE 940, CF 862, CF 863, CF 864, CF 865, CF 866, CF 867, CF 868, CF 869, CG 525, CG 526, 

CG 527, CG 528, CG 529, CG 530, CG 531, CG 532, CG 883, CG 884, CG 886, CG 887, 

CG 888, CG 889, CG 890, CH 340, CH 341, CH 342, CH 343, CH 344, CH 345, CH 346, CH 347, 

CH 348, CH 722, CH 723, CH 724, CH 726, CH 727, CH 728, CH 729, CH 730, CH 731, CH 732, 

CH 733, CK 305, CK 306, CM 130, CM 131, CM 132, CM 133, CM 134, CM 135, CM 136, 

CM 137, CM 138, CM 139, CM 140, CM 427, CM 428, CM 429, CM 430, CM 431, CM 432, 

CM 433, CM 434, CM 435, CM 436, CM 437, CM 438, CM 817, CM 819, CM 820, CM 821, 

CM 822, CM 823, CM 824, CM 825, CM 826, CM 827, CM 828, CM 829, CM 830, CN 772, 

CN 773, CN 774, CN 775, CN 778, CN 779, CN 780, CP 786, CP 787, CP 788, CP 789, CP 790, 

CP 791, CP 994, CP 996, CP 997, CP 998, CP 999, CR 360, CR 361, CR 364, CR 365, CR 838, 

CR 839, CR 840, CR 841, CR 842, CR 843, CR 844, CR 845, CR 846, CT 273, CT 274, CT 555, 

CT 556, CT 557, CT 559, CT 560, CT 561, CU 050, CU 051, CU 052, CU 053, CU 055, CU 056, 

CU 057, CU 353, DA 366, DB 461, DB 462, DB 463, DB 464, DB 465 
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 18

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

2 Use new safety wire (PN MS20995C32) to attach a new identification plate 

(Parker PN 48438) to the hydraulic pump as follows: 

NOTE: The hydraulic pump advances to Hamilton Sundstrand part 

number 5916485 and Parker part number 4207903. 

CAUTION: THE EXISTING HYDRAULIC PUMP SAFETY WIRE SHOULD 

NOT BE REMOVED. IT SECURES AN ADJUSTING SCREW. 

REMOVAL OF THIS EXISTING SAFETY WIRE COULD LET A 

CRITICAL PUMP SETTING BE CHANGED. 

a Do not remove the existing hydraulic pump safety wire. 

WARNING: THE FORCE MADE WHEN LOCKWIRE (ALSO KNOWN AS 

SAFETY WIRE) IS TWISTED OR CUT CAN CAUSE THE 

LOCKWIRE TO BECOME A PROJECTILE. THE FORCE CAN 

CAUSE THE LOCKWIRE TO DAMAGE OR GO THROUGH 

THE SURFACE OF YOUR EYES. THIS DAMAGE COULD 

CAUSE PERMANENT BLINDNESS IN THE EFFECTED EYE. 

BEFORE YOU REMOVE OR INSTALL THE LOCKWIRE, PUT 

ON SAFETY GLASSES WITH SIDE-SHIELDS OR SAFETY 

GOGGLES. IF THE LOCKWIRE GETS INTO YOUR EYE, GET 

IMMEDIATE MEDICAL AID. IF THE LOCKWIRE HAS GONE 

THROUGH THE SURFACE OF THE EYE, DO NOT TRY TO 

REMOVE THE LOCKWIRE. MAKE SURE THAT A TRAINED 

MEDICAL PERSON REMOVES THE LOCKWIRE.

b Use safety wire to attach a new hydraulic pump identification plate 

(Parker PN 48438) (refer to Figure 1 of this bulletin).

1) Thread approximately 18 to 20 inches (457 to 508 millimeters) of 

new safety wire (PN MS20995C32) through the grommets of the 

new identification plate (Parker PN 48438).

2) Position the new identification plate (Parker PN 48438) adjacent to 

existing hydraulic pump identification plate. 

3) Use a single-wire method to wrap the safety wire around the 

hydraulic pump housing (adjacent to flange). 

4) Put the safety wire pigtail at the bottom of the hydraulic pump for 

accessibility.

3 Proceed to paragraph 3.F. (Identification - On the Aircraft) or paragraph 3.G.

(Identification - In the Shop) of this bulletin. 
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 19

Use or disclosure of this data is subject to restrictions on the front page of this document.

C. Disassembly 

(1) Disassemble the RAT module as necessary to remove the hydraulic pump (280, 

IPL Figure 1) or (240, IPL Figure 1A) (refer to CMM 29-21-31, DISASSEMBLY). 

Discard the parts that follow.

- O-ring (110, IPL Figure 1) (if installed)

- Backup ring (180, IPL Figure 1) or (160, IPL Figure 1A)

- O-ring (190A, IPL Figure 1) or (170, IPL Figure 1A)

- Backup ring (210, IPL Figure 1) or (190, IPL Figure 1A)

- O-ring (220A, IPL Figure 1) or (200, IPL Figure 1A)

- Backup Ring (240, IPL Figure 1) or (220, IPL Figure 1A)

- O-ring (250A, IPL Figure 1) or (230, IPL Figure 1A)

- Radial seal (323 or -323A, IPL Figure 1) or (340, IPL Figure 1A)

- O-ring (324A, IPL Figure 1) or (320, IPL Figure 1A)

D. Assembly

(1) Use the hydraulic pump PN 5916430 [in place of (280, IPL Figure 1) or 

(240, IPL Figure 1A)] and the following new parts to assemble the RAT module (refer 

to CMM 29-21-31, ASSEMBLY). 

- O-ring (324A, IPL Figure 1) or (320, IPL Figure 1A)

- Radial seal (-323A, IPL Figure 1) or (340, IPL Figure 1A)

- O-ring (250A, IPL Figure 1) or (230, IPL Figure 1A)

- Backup Ring (240, IPL Figure 1) or (220, IPL Figure 1A)

- O-ring (220A, IPL Figure 1) or (200, IPL Figure 1A)

- Backup ring (210, IPL Figure 1) or (190, IPL Figure 1A)

- O-ring (190A, IPL Figure 1) or (170, IPL Figure 1A)

- Backup ring (180, IPL Figure 1) or (160, IPL Figure 1A)

- O-ring (110, IPL Figure 1) (if removed)

E. Test 

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

Sundstrand CMM 29-21-31, TESTING AND FAULT ISOLATION). 

(2) If the RAT module is on the aircraft and the hydraulic pump has been replaced, do a 

functional test of the RAT (refer to the applicable Airbus AMM).

(3) If the RAT module is on the aircraft, and if the RAT hydraulic pump has been 

reidentified on the aircraft, no test is necessary.
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 20

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

F. Identification (On the Aircraft)

NOTE: If the RAT module identification plate or modification plate is missing, 

operators should contact Hamilton Sundstrand for a replacement part. 

NOTE: If additional information is required to mark the RAT module identification or 

modification plate, 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@hs.utc.com

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

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

part number (of the RAT module) on the RAT module identification plate as shown 

in Table 8 of this bulletin. (Refer to Figure 2 of this bulletin for the location of the 

identification plate). Table 8

Table 8 Note 1: Hamilton Sundstrand Service Bulletin ERPS06M-29-18 (which must be done prior 

to, or in conjunction with, this bulletin for RAT module PN 1702934A) advances 

the RAT module part number from 1702934A to 1702934B. 

Table 8

RAT Module Part Number Change

From

Part Number

To

Part Number

766351 766351A 

768084 768084A

770379 770379A

770952 770952C

770952A 770952D

770952B 770952E

1702934 1702934C

1702934A (Note 1)

1702934B 1702934D
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 21

Use or disclosure of this data is subject to restrictions on the front page of this document.

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

through Mod Dot 19 on the RAT module modification plate. (Refer to Figure 2 of 

this bulletin for the location of the modification plate).

NOTE: The next time the modified RAT module is in the shop:

1. For RAT modules with bar-coded identification plates, the 

existing identification plate should be replaced with a new 

identification plate (refer to Table 9 of this bulletin and Hamilton 

Sundstrand CMM 29-21-31, ASSEMBLY).

2. The existing modification plate should be replaced with a new 

modification plate (PN 761251) (refer to Hamilton Sundstrand 

CMM 29-21-31, ASSEMBLY). 

G. Identification (In the Shop)

(1) (PN 766351 or 768084) Identify the RAT module as follows (refer to SPM 20-00-00, 

ASSEMBLY):

(a) Mark the letter A after the part number (766351 or 768084) in the P/N block of the 

identification plate (540, IPL Figure 1, CMM 29-21-31).

(b) Replace the modification plate (555) as follows: 

1 If not already marked, mark the applicable new RAT module part number 

(766351A or 768084A) on a new modification plate (555).

2 Transfer any pertinent information from the existing modification plate to the 

new modification plate (555). 

3 Mark an X through Mod Dot 19 on the new modification plate (555).

4 Replace the existing modification plate with the new modification plate (555).

(2) (PN 770379, 770952, 770952A, 770952B, 1702934, 1702934A, or 1702934B) Identify 

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

(a) Replace the identification plate as follows: 

NOTE: Incorporation of this bulletin advances the RAT module part number 

(refer to Table 9 of this bulletin).

1 Transfer any pertinent information from the existing identification plate to a 

new identification plate (refer to Table 9 of this bulletin). 

2 Replace the existing identification plate with the new identification plate 

(refer to Table 9 of this bulletin and CMM 29-21-31, ASSEMBLY).
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 22

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

(b) Replace the modification plate (350, IPL Figure 1A, CMM 29-21-31) as follows: 

1 If not already marked, mark the applicable new RAT module part number 

(refer to Table 9 of this bulletin) on a new modification plate (350).

2 Transfer any pertinent information from the existing modification plate to the 

new modification plate (350). 

3 Mark an X through Mod Dot 19 on the new modification plate (350).

4 Replace the existing modification plate with the new modification plate (350). Table 9

Table 9 Note 1: Hamilton Sundstrand Service Bulletin ERPS06M-29-18 (which must be done prior 

to, or in conjunction with, this bulletin for RAT module PN 1702934A) advances 

the RAT module part number from 1702934A to 1702934B.

Table 9

RAT Module Identification 

From

Part Number

To

Part Number

Existing Identification Plate

Part Number

New Identification Plate 

Part Number

770379 770379A 1700217-1 (-540A, IPL Figure 1) 1700217-8

770952 770952C 1700217-2 (-540B) 1700217-9

770952A 770952D 1700217-3 (-540C) 1700217-10

770952B 770952E 1700217-4 (-540D) 1700217-11

1702934 1702934C 1700217-5 (360, IPL Figure 1A) 1700217-12

1702934A (Note 1) 1700217-6 (-360A) 1700217-13

1702934B 1702934D 1700217-6 (-360A) 1700217-13
SERVICE BULLETIN

Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 23

Use or disclosure of this data is subject to restrictions on the front page of this document.

Figure 1

Figure 1

Installation of the New Hydraulic Pump Identification Plate

VIEW B

IDENTIFICATION

PLATE

PN 48438

SAFETY 

WIRE

SAFETY 

WIRE

SB-ERPS06M2919-108681 HS P/N5916485

IDENTIFICATION

PLATE B

Parker P/N4207903

HS P/N5916485
Original Issue Date: Aug 6/12 ERPS06M-29-19

Page 24

SERVICE BULLETIN

Use or disclosure of this data is subject to restrictions on the front page of this document.

Figure 2

Figure 2

Location of the RAT Module Modification and Identification Plates

SB-ERPS06M2919-108687

RAT MODULE

MODIFICATION PLATE

RAT MODULE

IDENTIFICATION PLATE