LANDING GEAR - MAIN LANDING GEAR RETRACTION ACTUATOR AND ATTACHMENT INSPECTION 1. PLANNING INFORMATION A. SB EFFECTIVITY Aircraft affected: MODEL SN Embraer 190( ) and 195( ) 19000002, 19000004, 19000006 thru 19000108, 19000110 thru 19000139, 19000141 thru 19000158, 19000160 thru 19000176, 19000178 thru 19000202, 19000204 thru 19000224, 19000226 thru 19000235, 19000237 thru 19000242, 19000244 thru 19000260, 19000262 thru 19000277, 19000279 thru 19000295, 19000297 thru 19000306, 19000308 thru 19000316, 19000318 thru 19000324, and 19000326 thru 19000339, equipped with affected component. Affected component: Main Landing Gear (MLG) Retraction Actuator PN 190-70980-403, all serial numbers. In-production effectivity: The subject presented in this bulletin does not affect any in-production aircraft. B. CONCURRENT REQUIREMENTS In case of replacement of the MLG retraction actuator by PN 190-70980-405, the accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR is required. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 1 of 23 Embraer Copyright © 2010. All rights reserved.C. REASON (1) HISTORY An operator has reported instances of damage to the rod end of the MLG retraction actuator, found during the aircraft maintenance procedures. Until August 2009, 6 (six) MLG retract actuators from 4 (four) aircraft were found damaged on their rod ends. Further analysis revealed that the MLG retraction actuator eye and bearing may be severely damaged. In a bench test, a damaged retraction removed from the fleet performed 17,000 FC with no additional damage to the MLG retraction actuator rod. Although it is unlikely, the analysis revealed that the actuator rod may break, causing a gear extension with no hydraulic damping. In this condition, the lower side stay bolt, which is the mechanical load fuse in the locking assembly, may be damaged causing the unlocking of the MLG. (2) OBJECTIVE To present instructions for doing a visual inspection on the LH and RH MLG retraction actuator rod-end, bolt and anti-rotation pin and, if necessary, replacing the MLG retraction actuator, bolt and/or anti-rotation pin. (3) EXPECTED BENEFITS The purpose of this bulletin is to prevent the failure of the retraction actuator. (4) REVISION HISTORY None. D. DESCRIPTION This Bulletin is divided into 3 PARTS, as follows: PART I LH and RH MLG Retraction Actuator Inspection Applicable to: Applicable to 1.A. SB EFFECTIVITY The procedure presented in this PART consists of inspecting the LH and RH MLG retraction actuator rod-end, bolt, cotter pin and anti-rotation pin for the evidence of damage, rod-end stiffness and positioning, and:

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 2 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.– If a discrepancy is found in the cotter pin, reinstall the washer, nut and cotter pin. – If a discrepancy is found at the other parts during this inspection, replace the affected parts according to PART II or PART III, as applicable. – If there is no discrepancy in the MLG retraction actuator, bolt, cotter pin and anti-rotation pin no action is required. To do this, it is necessary to gain access to the LH and RH MLG area. PART II LH MLG Retraction Actuator Replacement Applicable to: Applicable to 1.A. SB EFFECTIVITY The procedure presented in this PART consists of: – Replacing the LH MLG retraction actuator PN 190-70980-403 with a new one bearing the same part number. For the replacement by PN 190-70980-405 simultaneous accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR is required. – Replacing the anti-rotation pin with a new one bearing the same PN, if necessary, – If a discrepancy is found in the MLG retraction actuator attachment bolt during the accomplishment of PART I, replacement of it by a new one bearing the same PN is necessary. To do this, it is necessary to gain access to the LH MLG area. A limited number of units will be placed in a rotable pool for the operator’s use. Coordination of this rotable pool is administered by the Liebherr-Aerospace. Operators should contact Liebherr-Aerospace for scheduling information at the address mentioned in paragraph 2.B. INDUSTRY SUPPORT INFORMATION

. PART III RH MLG Retraction Actuator Replacement Applicable to: Applicable to 1.A. SB EFFECTIVITY The procedure presented in this PART consists of: 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 3 Embraer Copyright © 2010. All rights reserved.– Replacing the RH MLG retraction actuator PN 190-70980-403 with a new one bearing the same part number. For the replacement by PN 190-70980-405 simultaneous accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR is required. – Replacing the anti-rotation pin with a new one bearing the same PN, if necessary, – If a discrepancy is found in the MLG retraction actuator attachment bolt during the accomplishment of PART I, replacement of it by a new one bearing the same PN is necessary. To do this, it is necessary to gain access to the RH MLG area. A limited number of units will be placed in a rotable pool for the operator’s use. Coordination of this rotable pool is administered by Liebherr-Aerospace. Operators should contact Liebherr-Aerospace for scheduling information at the address mentioned in paragraph 2.B. INDUSTRY SUPPORT INFORMATION

. NOTE: The modification presented in this bulletin does not affect the Fatigue Critical Structure (FCS). E. COMPLIANCE (1) PART I - LH and RH MLG Retraction Actuator Inspection For MLG retraction actuators that have logged less than 3500 Flight Cycle(s) accumulated, Embraer recommends that PART I of this Service Bulletin be accomplished before 4500 Flight Cycle(s) have been reached. If the MLG retraction actuator has more than 3500 Flight Cycle(s), Embraer recommends that PART I of this Service Bulletin be accomplished within 1000 Flight Cycle(s) of the MLG retraction actuator. The inspection described in PART I of this Service Bulletin should be carried out 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 4 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.every 3500 Flight Cycle(s) of the MLG retraction actuator, after the first accomplishment, until SB190-32-0037 is accomplished. (2) PART II - LH MLG Retraction Actuator Replacement If any discrepancy is found on the LH MLG retraction actuator during the accomplishment of PART I, Embraer recommends that the LH MLG retraction actuator and, if applicable, the anti-rotation pin and the attachment bolt be replaced within the next 500 Flight Cycle(s). (3) PART III - RH MLG Retraction Actuator Replacement If any discrepancy is found on the RH MLG retraction actuator during the accomplishment of PART I, Embraer recommends that the RH MLG retraction actuator and, if applicable, the anti-rotation pin and the attachment bolt be replaced within the next 500 Flight Cycle(s). F. APPROVAL The technical aspects of this Service Bulletin are approved by: Agência Nacional de Aviação Civil (ANAC). G. ESTIMATED MANPOWER This estimate is for direct labor only, performed by experienced personnel, and does not include the time to plan, prepare, or inspect the work. It is assumed that all the tools, parts, and other means are readily available when necessary. This estimate does not include the sealant, paint, or adhesive curing time. (1) PART I - LH and RH MLG Retraction Actuator Inspection – Access opening: None. – Inspection: 0.7 man-hours. – Modification: None. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 5 Embraer Copyright © 2010. All rights reserved.– Access closure: None. – Test: None. (2) PART II - LH MLG Retraction Actuator Replacement – Access opening: None. – Inspection: None. – Modification: 3.0 man-hours. – Access closure: None. – Test: 2.0 man-hours. NOTE: This estimate does not include the manpower required for the accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR, in case of replacement by PN 190-70980-405. (3) PART III - RH MLG Retraction Actuator Replacement – Access opening: None. – Inspection: None. – Modification: 3.0 man-hours. – Access closure: None. – Test: 2.0 man-hours. NOTE: This estimate does not include the manpower required for the accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR, in case of replacement by PN 190-70980-405. H. WEIGHT AND BALANCE – Change in basic weight: None. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 6 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.– Change in basic moment: None. I. SOFTWARE ACCOMPLISHMENT SUMMARY None. J. REFERENCES AMM 190/( ) Aircraft Maintenance Manual PART II - 20-00-00 - STANDARD PRACTICES-AIRFRAME. AMM 190/( ) Aircraft Maintenance Manual PART II - 32-00-00 and 32-31-01 - LANDING GEAR. SB190-32-0037 LANDING GEAR - REPLACEMENT OF MAIN LANDING GEAR RETRACTION ACTUATOR. K. OTHER PUBLICATIONS AFFECTED None. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 7 Embraer Copyright © 2010. All rights reserved.2. MATERIAL INFORMATION A. MATERIAL - PRICE AND AVAILABILITY (1) MATERIAL AVAILABLE FROM EMBRAER None. (2) MATERIAL AVAILABLE FROM OTHER VENDORS Refer to section 2.C. MATERIAL NECESSARY FOR EACH AIRCRAFT

. B. INDUSTRY SUPPORT INFORMATION If you remove the retraction actuator, send it to Liebherr Aerospace at one of the following addresses: (1) For European, African, Middle Eastern Operators: Customer Service Liebherr-Aerospace Lindenberg GmbH Pfaenderstrasse 50-52 88161 Lindenberg Germany Tel: +49 8381 46 4868 Fax:+ 49 8381 46 4135 Mail: spares.lli@liebherr.com (2) For North American or South American Operators: Customer Service Liebherr-Aerospace Saline 1465 Woodland Drive Saline Michigan 48176-1259 USA Tel: + 1 734 944 6378 Fax: + 1 734 429 5357 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 8 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.(3) For Asian or Oceania Operators: Customer Service Liebherr-Aerospace Singapore 8 Pandan Avenue Singapore 609384 Singapore USA Tel: + 65 6424 7211 Fax: + 65 6265 2657 (4) For Chinese Operators: Customer Service Liebherr-Aerospace Shanghai German Center #709 88 Keyuan Road Pundong Zhang Jiang Hi-Tech Park P.R. China Tel: + 86 21 5027 6092 Fax: + 86 21 5027 6116 C. MATERIAL NECESSARY FOR EACH AIRCRAFT When applicable, the use of alternative or similar parts in place of the one specified in the kits is allowable, provided that these alternative or similar parts are approved by Embraer as indicated in the related Embraer Technical Publications or through a formal Embraer communication channel. The necessary expendable or consumable parts presented in the AMM Tasks referred to in this bulletin should be procured from the operator’s inventories or ordered as spares. The complementary information, when necessary, is presented as Notes in the respective Table. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 9 Embraer Copyright © 2010. All rights reserved.(1) TOP KITS AND KITS None. (2) MATERIAL TO BE PROCURED (a) Parts If necessary, the parts below should be procured from the supplier, as indicated in the associated Note. Applicable to PART II NEW PN DESCRIPTION OLD PN QTY DISP/ Notes 190-70980-403 or 190-70980-405 Retraction Actuator 190-70980-403 01 7/ [1] [2] 3/ [1] [3] 2821-0028 Bolt 2821-0028 01 7/ [1] [2] [4] 1656-0111 Anti-rotation pin 1656-0111 01 7/ [1] [2] MS24665-374 Cotter Pin MS24665-374 01 7/ [5]
1. LIEBHERR-AEROSPACE. 2. If applicable, retraction actuator 190-70980-403, bolt 2821-0028 and anti-rotation pin PN 1656-0111 required for the accomplishment of this bulletin, will be available from Liebherr-Aerospace at no charge to the operator. Refer to section 2.B. INDUSTRY SUPPORT INFORMATION. 3. This part list does not include the material required for the accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR, in case of replacement by PN 190-70980-405. 4. These bolts PN 2821-0028 installed in MLG Shock Strut below SN 208 (LH) and SN 5207 (RH) do not have Xylan treatment. These bolts must be replaced by a new one with Xylan treatment applied. The old bolt must be sent back to Liebherr-Aerospace. Refer to section 2.B. INDUSTRY SUPPORT INFORMATION. 5. If applicable, cotter pin PN MS24665-374, required for the accomplishment of this bulletin, should be procured from the operator’s inventories or from a local supplier. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 10 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.Applicable to PART III NEW PN DESCRIPTION OLD PN QTY DISP/ Notes 190-70980-403 or 190-70980-405 Retraction Actuator 190-70980-403 01 7/ [1] [2] 3/ [1] [3] 2821-0028 Bolt 2821-0028 01 7/ [1] [2] [4] 1656-0111 Anti-rotation pin 1656-0111 01 7/ [1] [2] MS24665-374 Cotter Pin MS24665-374 01 7/ [5]
1. LIEBHERR-AEROSPACE. 2. If applicable, retraction actuator 190-70980-403, bolt 2821-0028, and anti-rotation pin PN 1656-0111 required for the accomplishment of this bulletin, will be available from Liebherr-Aerospace at no charge to the operator. Refer to section 2.B. INDUSTRY SUPPORT INFORMATION. 3. This part list does not include the material required for the accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR, in case of replacement by PN 190-70980-405. 4. These bolts PN 2821-0028 installed in MLG Shock Strut below SN 208 (LH) and SN 5207 (RH) do not have Xylan treatment. These bolts must be replaced by a new one with Xylan treatment applied. The old bolt must be sent back to Liebherr-Aerospace. Refer to section 2.B. INDUSTRY SUPPORT INFORMATION. 5. If applicable, cotter pin PN MS24665-374, required for the accomplishment of this bulletin, should be procured from the operator’s inventories or from a local supplier. (b) Consumable Materials The material below or equivalent, required for the accomplishment of this bulletin, should be procured from the operator’s inventories or from a local supplier.

NEW PN DESCRIPTION OLD PN QTY DISP/ Notes MEK Solvent - AR 6/ [1] 1. Methyl Ethyl Ketone (ASTM-D-740) MEK. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 11 Embraer Copyright © 2010. All rights reserved.NEW PN DESCRIPTION OLD PN QTY DISP/ Notes

- Cleaning agent - Ethyl Alcohol - AR 6/ [1] - Rapid Cure Sealant - AR 6/ [2] - Liquid Nitrogen - AR 6 1. Spec: O-E-00760 Type III. 2. Spec: PR 1826 B2 ALO. DISPOSITION: 3 = Replace part bearing OLD PN with part bearing NEW PN 6 = Apply as required 7 = Replace with part bearing same PN QUANTITY: AR = As Required D. MATERIAL NECESSARY FOR EACH SPARE None. E. REIDENTIFIED PARTS None. F. TOOLING - PRICE AND AVAILABILITY Whenever required, the necessary tooling presented in the AMM Tasks referred to in this bulletin, should be procured from the operator’s inventories or ordered as spares. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 12 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.3. ACCOMPLISHMENT INSTRUCTIONS NOTE: 1) For the purpose of this Service Bulletin, a General Visual Inspection (GVI) is: “A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked.” 2) Obey all of the WARNINGS and CAUTIONS included in the referenced manuals and procedures. 3) The Manuals and other documents are referred to by acronyms or using a simplified form. Refer to section 1.J. REFERENCES for a more complete definition. The steps below outline the general accomplishment instructions. The detailed sequence is included in the respective figure, when necessary. A. PART I - LH and RH MLG Retraction Actuator Inspection (1) Make sure that the aircraft is safe for maintenance. Refer to AMM TASK 20-00-00-910-801-A/200 - Aircraft Maintenance Safety Procedures - Standard Procedures. (2) Make sure that the aircraft is safe for landing gear maintenance. Refer to AMM TASK 32-00-00-860-801-A/200 - Landing Gear - Prepare for Maintenance. (3) Perform a general visual inspection on the LH and RH MLG retraction actuator and on bolt PN 2821-0028 used to attach the actuator to the shock strut, according to Figure 1

. (a) If any discrepancy is found, replace the affected retraction actuator and if applicable, anti-rotation pin PN 1656-0111 and bolt PN 2821-0028 by accomplishing PART II or PART III, as applicable. (b) If no discrepancy is found, continue with Step 3.A.(4) and on. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 13 Embraer Copyright © 2010. All rights reserved.(4) Restore the aircraft after the landing gear maintenance. Refer to AMM TASK 32-00-00-860-802-A/200 - Landing Gear - Restore after Maintenance. (5) Restore the aircraft to normal. (6) Enter the accomplishment of PART I of this bulletin in the applicable documents. B. PART II - LH MLG Retraction Actuator Replacement (1) Make sure that the aircraft is safe for maintenance. Refer to AMM TASK 20-00-00-910-801-A/200 - Aircraft Maintenance Safety Procedures - Standard Procedures. WARNING : MAKE SURE THAT THE LANDING GEAR SAFETY PINS ARE INSTALLED. THIS IS TO PREVENT INJURIES TO PERSONS AND DAMAGE TO MATERIAL. (2) Make sure that the aircraft is safe for landing gear maintenance. Refer to AMM TASK 32-00-00-860-801-A/200 - Landing Gear - Prepare for Maintenance. (3) Replace retraction actuator PN 190-70980-403 of the Left-Hand (LH) Main Landing Gear (MLG) and if applicable, anti-rotation pin PN 1656-0111 and bolt PN 2821-0028. Refer to Figure 2

. (a) Remove retraction actuator PN 190-70980-403, according to AMM TASK 32-31-01-000-801-A/400 - Main-Landing-Gear Retraction Actuator - Removal. (b) Perform a general visual inspection to the shock strut lug internal surface in the area adjacent to the retraction actuator rod-end fixation point for damage. 1 If any evidence of damage is found, contact Embraer. 2 If no discrepancy is found, continue with Step 3.B.(3)(c) and on. (c) Replace Anti-rotation pin PN 1656-0111 with a new one bearing the same part number if necessary, as follows: 1 Secure the shim on the inner side of the opposite flange of the anti-rotation pin by using adhesive tape. 2 Install the screw TYPE AN4H11A into the hole of the anti-rotation pin. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 14 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.3 Using a screwdriver, apply leverage on the bolt, to push it out from the anti-rotation pin. WARNING : LIQUID NITROGEN IS DANGEROUS, OBEY MANUFACTURERS INSTRUCTIONS. WARNING : OBEY THE PRECAUTIONS THAT FOLLOW WHEN YOU USE CLEANING AGENTS:

– WEAR SAFETY GOGGLES.

– WEAR PROTECTIVE CLOTHING.

– DO NOT LET CLEANING AGENTS TOUCH YOUR SKIN, EYES, AND MOUTH.

– WORK IN AN AREA THAT HAS A GOOD AIRFLOW.

– OBEY THE MANUFACTURER’S INSTRUCTIONS.

– GET MEDICAL AID IF IRRITATION OCCURS. CLEANING AGENTS CAN CAUSE INJURIES. 4 Put a new anti-rotation pin into a liquid nitrogen bath, for approximately 5 min to decrease the temperature of the anti-rotation pin to

−195 °C (

−320 °F). 5 Use a polyethylene spatula, a lint free wiper cloth and an approved cleaning solvent to remove all the sealant from around the hole of the anti-rotation pin. 6 Install the anti-rotation pin. NOTE: Because of the small dimension of the pin, the surrounding metal components will rapidly bring its temperature to ambient. This step needs to be accomplished in a short period of time. NOTE: Use a hammer if necessary. (d) Install new retraction actuator PN 190-70980-403 or 190-70980-405, according to AMM TASK 32-31-01-400-801-A/400 - Main-Landing-Gear Retraction Actuator - Installation. For the installation of LH MLG retraction actuator PN 190-70980-405 simultaneous accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR is required. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 15 Embraer Copyright © 2010. All rights reserved.1 If applicable, during the installation of LH MLG retraction actuator, replace bolt PN 2821-0028 with a new one bearing the same part number by using new cotter pin PN MS24665-374 and reusing sleeve PN 2225-0002, washer PN NAS1149C1690R, and nut PN MS14145-16. 2 Make sure the operational test of the landing gear is performed, according to job close-up of AMM TASK 32-31-01-400-801-A/400 - Main-Landing-Gear Retraction Actuator - Installation. (e) Send the removed retraction actuator and the bolt, if replaced to Liebherr Aerospace at the address presented in paragraph 2.B. INDUSTRY SUPPORT INFORMATION

. (4) Restore the aircraft after the landing gear maintenance. Refer to AMM TASK 32-00-00-860-802-A/200 - Landing Gear - Restore after Maintenance. (5) Restore the aircraft to normal. (6) Enter the accomplishment of PART II of this bulletin in the applicable documents. C. PART III - RH MLG Retraction Actuator Replacement (1) Make sure that the aircraft is safe for maintenance. Refer to AMM TASK 20-00-00-910-801-A/200 - Aircraft Maintenance Safety Procedures - Standard Procedures. WARNING : MAKE SURE THAT THE LANDING GEAR SAFETY PINS ARE INSTALLED. THIS IS TO PREVENT INJURIES TO PERSONS AND DAMAGE TO MATERIAL. (2) Make sure that the aircraft is safe for landing gear maintenance. Refer to AMM TASK 32-00-00-860-801-A/200 - Landing Gear - Prepare for Maintenance. (3) Replace retraction actuator PN 190-70950-403 of the Right-Hand (RH) Main Landing Gear (MLG) and if applicable, anti-rotation pin PN 1656-0111 and bolt PN 2821-0028. Refer to Figure 2

. (a) Remove retraction actuator PN 190-70980-403, according to AMM TASK 32-31-01-000-801-A/400 - Main-Landing-Gear Retraction Actuator - Removal. (b) Perform a general visual inspection to the shock strut lug internal surface in the area adjacent to the retraction actuator rod-end fixation point for damage. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 16 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.1 If any evidence of damage is found, contact Embraer. 2 If no discrepancy is found, continue with Step 3.C.(3)(c) and on. (c) Replace Anti-rotation pin PN 1656-0111 with a new one bearing the same part number if necessary, as follows: 1 Secure the shim on the inner side of the opposite flange of the anti-rotation pin by using adhesive tape. 2 Install the screw TYPE AN4H11A into the hole of the anti-rotation pin. 3 Using a screwdriver, apply leverage on the bolt, to push it out from the anti-rotation pin. WARNING : LIQUID NITROGEN IS DANGEROUS, OBEY MANUFACTURERS INSTRUCTIONS. WARNING : OBEY THE PRECAUTIONS THAT FOLLOW WHEN YOU USE CLEANING AGENTS:

– WEAR SAFETY GOGGLES.

– WEAR PROTECTIVE CLOTHING.

– DO NOT LET CLEANING AGENTS TOUCH YOUR SKIN, EYES, AND MOUTH.

– WORK IN AN AREA THAT HAS A GOOD AIRFLOW.

– OBEY THE MANUFACTURER’S INSTRUCTIONS.

– GET MEDICAL AID IF IRRITATION OCCURS. CLEANING AGENTS CAN CAUSE INJURIES. 4 Put a new anti-rotation pin into a liquid nitrogen bath, for approximately 5 min to decrease the temperature of the anti-rotation pin to

−195 °C (

−320 °F). 5 Use a polyethylene spatula, a lint free wiper cloth and an approved cleaning solvent to remove all the sealant from around the hole of the anti-rotation pin. 6 Install the anti-rotation pin. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 17 Embraer Copyright © 2010. All rights reserved.NOTE: Because of the small dimension of the pin, the surrounding metal components will rapidly bring its temperature to ambient. This step needs to be accomplished in a short period of time. NOTE: Use a hammer if necessary. (d) Install new retraction actuator PN 190-70980-403 or 190-70980-405, according to AMM TASK 32-31-01-400-801-A/400 - Main-Landing-Gear Retraction Actuator - Installation. For the installation of LH MLG retraction actuator PN 190-70980-405 simultaneous accomplishment of SB190-32-0037 - REPLACEMENT OF MLG RETRACTION ACTUATOR is required. 1 If applicable, during the installation of RH MLG retraction actuator, replace bolt PN 2821-0028 with a new one bearing the same part number by using new cotter pin PN MS24665-374 and reusing sleeve PN 2225-0002, washer PN NAS1149C1690R, and nut PN MS14145-16. 2 Make sure the operational test of the landing gear is performed, according to job close-up of AMM TASK 32-31-01-400-801-A/400 - Main-Landing-Gear Retraction Actuator - Installation. (e) Send the removed retraction actuator and the bolt, if replaced to Liebherr Aerospace at the address presented in paragraph 2.B. INDUSTRY SUPPORT INFORMATION

. (4) Restore the aircraft after the landing gear maintenance. Refer to AMM TASK 32-00-00-860-802-A/200 - Landing Gear - Restore after Maintenance. (5) Restore the aircraft to normal. (6) Enter the accomplishment of PART III of this bulletin in the applicable documents. NOTE: 1) Please inform us by e-mail fleet.reliability@embraer.com.br of the aircraft manufacturer serial number and the SB incorporation date, specifying the SB Part(s) incorporated or whether the whole SB has been incorporated. This will enable Embraer to consider your aircraft configuration when providing future modifications. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 18 DATE: 04/Oct/2010 REVISION No.: Embraer Copyright © 2010. All rights reserved.2) To formally inform that the SB has been incorporated fleet-wide or that the SB will not be incorporated, so that Embraer can update the affected technical publications, use the “Service Bulletin Full-Fleet Incorporation Report” form, which is available on the Flyembraer portal (http://www.flyembraer.com). 3) Use the attached “Service Bulletin Evaluation” form to send us your comments regarding this SB. Your feedback will be much appreciated as an aid to help us improve the quality of the SBs. 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 19 Embraer Copyright © 2010. All rights reserved.WARNING : BE CAREFUL WHEN YOU USE THE METHYL ETHYL KETONE (MEK). PUT ON SAFETY GOGGLES AND PROTECTIVE CLOTHING. DO NOT BREATHE THE GAS OR DUST. DO THE WORK IN AN AREA WHICH HAS A GOOD FLOW OF AIR. THE METHYL ETHYL KETONE (MEK) IS POISONOUS AND HIGHLY FLAMMABLE. 1. Using a cloth moist with Methyl Ethyl Ketone (ASTM-D-740) MEK , clean the retraction actuator and shock strut in the area around the retraction actuator rod-end. See Detail A

. 2. Check the cotter pin MS24665-374 for any visual damage. See Detail B

. (a) If any evidence of damage is found, reinstall washer PN NAS1149C1690R, nut PN MS14145-16 and cotter pin PN MS24665-374 according to AMM TASK 32-31-01-400-801-A/400 - Main-Landing-Gear Retraction Actuator - Installation. (b) If no discrepancy is found, continue with step 3. and on. 3. Perform a visual inspection on the rod-end of the retraction actuator and on bolt PN 2821-0028 used to attach the actuator to the shock strut as follows: (a) Check if the MLG retraction actuator rod-end is at the center line of the shock strut lug. See Detail B

. (b) Check the MLG retraction actuator rod-end for any visual damage. See Detail B

. (c) Check if bolt PN 2821-0028 is in the proper position (not rotated) and check if there are signs of cracks or damage. See Detail C

. (d) Check if there are signs of cracks or damage on the Anti-rotation pin PN 1656-0111. See Detail C

. 4. Check if there is play at the MLG retraction actuator rod-end with movements according to Detail D

. 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 20 DATE: 04/Oct/2010 REVISION No.: FIGURE 1 - MLG RETRACTION ACTUATOR INSPECTION (SHEET 01 OF 02)

Embraer Copyright © 2010. All rights reserved.

### A B

C

BOLT PN 2821−0028 (INSPECT) 

### B

C A ZONE

731 

### A ZONE

741
SHOCK STRUT LUG (REF.) MLG RETRACTION ACTUATOR (REF.)

1 CLEAN

LEFT SIDE SHOWN RIGHT SIDE OPPOSITEEM170SB320251D.DGN ANTI−ROTATION PIN PN 1656−0111 (INSPECT) MLG RETRACTION ACTUATOR PN 190−70980−403 (INSPECT)

RETRACTION ACTUATOR ROD−END (INSPECT) 

### D



### D 2 COTTER PIN PN MS24665−374 (INSPECT)

3 3

3

4 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 21 FIGURE 1 - MLG RETRACTION ACTUATOR INSPECTION (SHEET 02 OF 02)

Embraer Copyright © 2010. All rights reserved.

### A B

C



### B A ZONE

731 

### A ZONE

741 MLG RETRACTION ACTUATOR (REF.)

CLEAN



### C SHOCK STRUT LUG (REF.)



### D LEFT SIDE SHOWN RIGHT SIDE OPPOSITE

BOLT PN 2821−0028 (REPLACE)EM170SB320252C.DGN ANTI−ROTATION PIN PN 1656−0111 (INSPECT) MLG RETRACTION ACTUATOR PN 190−70980−403 (REPLACE) ADJACENT AREA (INSPECT) ADJACENT AREA (INSPECT) 

# SERVICE BULLETIN

SB No.: 190-32-0036 PAGE: 22 DATE: 04/Oct/2010 REVISION No.: FIGURE 2 - MLG RETRACTION ACTUATOR REPLACEMENT (SHEET 01 OF 02)

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− − LANDING GEAR FLANGE (REF.)

SCREW DRIVER (REF.) SCREW (TYPE AN4H11A) (REF.)EM170SB320253A.DGN 

### D SHIM (WOOD, ALUMINIUM, THICHNESS 3 CM) (REF.) ANTI−ROTATION PIN PN 1656−0111 (REMOVE AND DISCARD) (INSTALL) 

# SERVICE BULLETIN

DATE: 04/Oct/2010 REVISION No.: SB No.: 190-32-0036 PAGE: 23 FIGURE 2 - MLG RETRACTION ACTUATOR REPLACEMENT (SHEET 02 OF 02)

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### SERVICE BULLETIN EVALUATION

THE PURPOSE OF THIS FORM IS TO COLLECT DATA THAT WILL BE USED TO IMPROVE THE QUALITY OF OUR SERVICE BULLETINS AND UPDATE THE TECHNICAL PUBLICATIONS. PLEASE FILL IN FORM AND RETURN IT TO: EMBRAER - EMPRESA BRASILEIRA DE AERONÁUTICA S.A. EFTC - SERVICE BULLETIN ENGINEERING AV. BRIGADEIRO FARIA LIMA, 2170 SÃO JOSÉ DOS CAMPOS - SP - 12227-901 BRASIL Fax: + 55 12 3927-6600 (ext. 1624) e-mail: fleet.reliability@embraer.com.br S.B. Title: S.B.: (Number / Rev.) Operator: SB Implementation Report Aircraft Serial Number or Registration Number: Incorporation Date: Aircraft Flight Hours: Aircraft Landings:

POST-ACCOMPLISHMENT EVALUATION: (Check applicable squares below) ESTIMATED MANPOWER: [ ] OK [ ] NOT OK (Explain Below) MATERIAL & KITS: [ ] OK [ ] NOT OK (Explain Below) ACCOMPLISHMENT INSTRUCTIONS: [ ] OK [ ] NOT OK (Explain Below) FIGURES: [ ] OK [ ] NOT OK (Explain Below) SB GENERAL EVALUATION: [ ] OK [ ] NOT OK (Explain Below) COMMENTS: (Bulletin quality/ Difficulties found at the time of incorporation/ Suggested improvements/ Other)

Organization: Fax: Phone:
E-mail: Address: Prepared by:(Name/Title) Date:

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