## ALERT SERVICE BULLETIN

DAT E 

### REVISION NOTICE

A Subsid iar y of T e xtron Inc. 

### Nov 14, 2005

TO: All O w ners/Operators of Bell 427 Helicopters

SUBJ ECT: REVISION “A” TO ALERT SE RVICE BULL E TIN 427-05-12: CLEVIS ASSEMBL Y-HY DRAULIC SERVO ASSEM BLY PART NUMBER 410113 00 AND 41 01 1700

Revis i on “A” to this Alert Service Bulletin introduces the rewritten H y draulic Research Textron Bulletin. Included in the rewr itten bulletin are the following changes:

• The HR Textron Customer Service telephone number phone number, is added in Section 1, Step F.

• The compliance in Secti on 2, Step A, is changed.

• The inspec tion criteria are clarified in Sectio n 2.

• HR Textron-Authoriz ed Service Centers telephone and fax number are added in Table 1.

• A better graphic view of the proper installation is shown in Figure 1.

AN APPRO P RIA T E ENTRY S H OULD BE MADE I N TH E AIRCRAFT LOG B O O K UP O N ACCO MPLIS H MENT IF O W NE RSHIP O F AIRCRAFT HAS CHANG E D P L EASE FO RWA RD TO NEW OWNERNO.

DA TE

PAGE DA TE

RE V 

## ALERT SERVICE BULLETIN

A Subsid iar y of T e xtron Inc.

AN APPRO P RIA T E ENTRY S H OULD BE MADE I N TH E AIRCRAFT LOG B O O K UP O N ACCO MPLIS H MENT IF O W NE RSHIP O F AIRCRAFT HAS CHANG E D P L EASE FO RWA RD TO NEW OWNER 

### 427-05-12

Nov 14, 2005 

### Oct 12, 2005

A 1

MODEL AFFECTED: 427

SUBJ ECT: CLEVIS ASSEMBLY HYDRAUL I C SERVO ASSEMBL Y , PART NUMBER 410113 00 AND 41011700

HELICOPT ERS AF FECTED: Model 427 helicopters serial number 56001 through 56046 and 58001 and 58002.

[Model 427 helicopters serial numbers 56047 and 58003 and subseque n t will have the intent of this bulletin acc o mplished prior to delivery.]

COMPLIANCE: See vendor bulletin.

DES CRIPT ION:

The purpos e of this bulletin is to achieve complete distribution of the attached vendor bulletin to the current affect ed model distribution list on record by Bell Helicopter.

APP R OVAL:

See vendor bulletin approval.

# SERVICE BULLETIN

CLEVIS ASSEMBLY – HYDRAULIC SERVOACTUATOR, PART NUMBER 41011300



### 1. Planning Information
A. Effectivity This service bulletin applies to the clevis assembly, P/N 41009477-101, used on the hydraulic servo assembly, HR part number 41011300-101 (BHT 206-076-062-105 and -111). The intent of this service bulletin has been incorporated into these servo actuators with serial numbers 807 and subsequent.

B. Reason HR has discovered the possibility that the shaft (215) (refer to Figure 1) could be loose. The looseness is as a result of lock washer tabs (220), improperly bent over the flat surface of the nut (225) or the flat surface of the clevis assembly (205).

C. Description This service bulletin defines mandatory inspection of nut, shaft and, clevis assembly for possible looseness as result of improper lock washer installation. This discrepancy is not traceable or identifiable except by inspection. This inspection is applicable to servos identified in paragraph 1.A.of this bulletin.

D. Approval HR Textron Engineering.

E. Manpower Approximately 2.0 man-hour, are required to remove and reinstall each hydraulic servo actuator and approximately 0.5 man-hour is sufficient to conduct visual inspection.

F. Material Price and Availability Prior to returning any servo to service center, contact HR Textron Customer Service and Field Service Manager at: 25200 West Ry e Canyon Road, Santa Clarita, CA 91355-1265; 661-702-5509, or 661-702-5358 (tel. numbers) mhowell@hrtextron.Textron.com (email); or 661-702-5970 (fax). Provide HR Textron with the part number, serial number, time since new for new servo and in addition time since overhauled or repaired and the facility if the servo was recently overhauled or repaired. This applies to servos that are found with loose nut, shaft or clevis assembly or improperly install ed lock washer only. Warranty claims will be handled on a case-by-case basis.

G. Tooling Price and Availability New tools are not required.

November 9, 2005 

# 41011300-67-01 EXPO RT CO NTRO L WA RNING This document contains technical data w hose export, transfer, disclosure, and further publication are restricted by the applica ble export law s and regulations of the United States of America, including the Export Administration Act of 1979, as amended, and t he Export Administration Regulations. Violations of these law s and r egulations are subject to severe civil, criminal, and administ rati v e penalties.



### Revision 2 Page 

### 1 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

# SERVICE BULLETIN

H. Weight and Balance

Not affected.

I. Electrical Load Data

Not affected.

J. References
67-32-09 Component Maintenance Manual with Illustrated Parts List (for) Hydraulic Servo Actuator Assembly part number 41011300-101 (BHT 206-076-062-105 and -111).

K. Other Publications Affected
The intent of this service bulletin will be incorporated into the next revision of 67-32-09.



### 2. Accomplishment Instructions

A. Within the next 10 flight hours or before December 15, 2005, whichever comes first, accomplish this one-time mandatory inspection.

B. Retract the boot (230) and perform the following inspections:

1. Applying hand pressure only, and check if the nut, the shaft or the clevis assembly is turning independently from one another.

2. If the shaft will turn independently to the nut or the clevis assembly, prior to the next flight, the actuator shall be removed from service and forwarded to HR Textron or one of the HR Textron Service Centers listed in Table 1. Check step 1.F. for condition.

3. If the shaft is not turning independently from the nut or the clevis assembly proceed with step 2.B.4.

4. Check if at least one tab of the lock washer is bent flush against one of the nut flat surface and if at least one tab of the lock washer is bent flush against one of the two flat surfaces of the clevis assembly. Lock washer tab must also be in line with the flat surface of the nut and clevis assembly. If the lock washer tabs are not bent flush against the nut and clevis assembly or are not in line with the flats, proceed with the following steps.

5. If the lock washer tabs are not bent flush against the nut or clevis assembly flat surface, use needle-nosed pliers and make sure the lock washer tab is flush against nut or the flat surface of the clevis assembly.

November 9, 2005 

# 41011300-67-01 Use or disclosure of data on this page are subject to the restriction on Page 1.



### Revision 2 Page 

### 2 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

# SERVICE BULLETIN

6. If the lock washer tab is on the edge or not aligned with a flat surface (nut or clevis assembly). Within the next 300 hours, but not later than April 30, 2006, the actuator shall be removed from service and forwarded to HR Textron or one of the HR Textron Service Centers listed in Table 1. Check step 1.F. for condition.

C. If the servo meets all the requirements of the inspection or if the operator can accomplish the corrective action, the operator may perform the necessary corrective repairs. Remove modification plate from servo and metal-impression stamp or vibro-etch an abbreviated service bulletin number (67-01) on modification plate to identify compliance with this service bulletin. Modification plates are available; HR Textron will provide replacement modification plates if necessary. Corrective action accomplished by HR Textron or approved repair station will have the same identification added to modification plate.

Table 1. HR Textron-Authorized Service Centers

AEM Ltd Helicopter Support Inc. 8 Wilton Road 116 Quarry Road Haine Industrial Estate Trumbull, CT 06611 (USA) Ramsgate, Kent CT12 5HE (England) Tel; 001-(44)-1-843-591-381 Fax; 011-(44)-1-843-592-641 Tel; (203) 416-4300 Fax; (203) 416-4282

JAMCO Corp Stansted Airport 6-11-25 Osawa Mitaka Stansted, Essex CM24 1RB (England) Tel; 011-(44)-1-279-680-030 Fax; 011-(44)-1-279-680-040 Tokyo 181 (Japan) Tel; 011-(81) 422-31-6111 Fax; 011 (81) 422-32-6998

H A S E M o t o r f l u g G m b H Helicopter Accessory Servic e Inc. East Baden-Airpark 10102 Aileron Avenue Gebaude C-312 Pensacola, FL 32506 (USA) D-77836 Rheinmunster, Germany Tel; (850) 456-8339 Fax; (850) 456-5117 Tel; 011 (49) 7229-301-430 Fax; 011 (49) 7229-301-433

HAS West Osterm ans Aero AB Helicopter Accessory Service Inc. West Box 116 10985 Penrose Street SE-190 46 Stockholm-Arlanda Sun Valley, CA 91352 (USA) Tel; (818) 767-2214 Fax; (818) 767-2699 Sweden Tel; 011-(46)-8-593-787-00 Fax; 011-(46)-8-593-787-90

H E L I T R A D E S H E L I T R A D E S 18 Terry Fox Drive Site 5, Box 7, RR 2 Airdrie Airport Vanleek Hill, Ontario, Canada K0B 1R0 Tel; (613) 678-3027 Fax; (613) 678-2776 Airdrie, Canada K0B 1R0 Tel; (403) 912-4658 Fax; (403) 948-6475



### November 9, 2005 

# 41011300-67-01 Use or disclosure of data on this page are subject to the restriction on Page 1.



### Revision 2 Page 

### 3 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

### Clevis Assembly Figure 1

November 9, 2005 

# 41011300-67-01 Use or disclosure of data on this page are subject to the restriction on Page 1.



### Revision 2 Page 

### 4 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

# SERVICE BULLETIN

CLEVIS ASSEMBLY – HYDRAULIC SERVOACTUATOR, PART NUMBER 41011700



### 1. Planning Information

A. Effectivity
This service bulletin applies to the clevis assembly, P/N 41009477-101, used on the hydraulic servo assembly, HR part number 41011700-101 (BHT 206-076-062-109). The intent of this service bulletin has been incorporated into these servo actuators with serial numbers 230 and subsequent.

B. Reason
HR has discovered the possibility that the shaft (215) (refer to Figure 1) could be loose. The looseness is as a result of lock washer tabs (220), improperly bent over the flat surface of the nut (225) or the flat surface of the clevis assembly (205).

C. Description
This service bulletin defines mandatory inspection of nut, shaft and, clevis assembly for possible looseness as result of improper lock washer installation. This discrepancy is not traceable or identifiable except by inspection. This inspection is applicable to servos identified in paragraph 1.A.of this bulletin.

D. Approval
HR Textron Engineering.

E. Manpower
Approximately 2.0 man-hour, are required to remove and reinstall each hydraulic servo actuator and approximately 0.5 man-hour is sufficient to conduct visual inspection.

F. Material Price and Availability
Prior to returning any servo to service center, contact HR Textron Customer Service and Field Service Manager at: 25200 West Ry e Canyon Road, Santa Clarita, CA 91355-1265; 661-702-5509, or 661-702-5358 (tel. numbers) mhowell@hrtextron.Textron.com (email); or 661-702-5970 (fax). Provide HR Textron with the part number, serial number, time since new for new servo and in addition time since overhauled or repaired and the facility if the servo was recently overhauled or repaired. This applies to servos that are found with loose nut, shaft or clevis assembly or improperly install ed lock washer only. Warranty claims will be handled on a case-by-case basis.

November 9, 2005 

# 41011700-67-01 EXPO RT CO NTRO L WA RNING This document contains technical data w hos e export, transfer, disclosure, and further publication are restricted by the applica ble export law s and regulations of the United States of America, including the Export Administration Act of 1979, as amended, and t he Export Administration Regulations. Violations of these law s and r egulations are subject to severe civil, criminal, and administ rati v e penalties.



### Revision 2 Page 

### 1 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

# SERVICE BULLETIN

G. Tooling Price and Availability New tools are not required.

H. Weight and Balance

Not affected.

I. Electrical Load Data

Not affected.

J. References 67-31-10 Component Maintenance Manual with Illustrated Parts List (for) Hydraulic Servo Actuator Assembly part number 41011700-101 (BHT 206-076-062-109).

K. Other Publications Affected The intent of this service bulletin will be incorporated into the next revision of 67-31-10.



### 2. Accomplishment Instructions

A. Within the next 10 flight hours or before December 15, 2005, whichever comes first, accomplish this one-time mandatory inspection.

B. Retract the boot (230) and perform the following inspections:

1. Applying hand pressure only, and check if the nut, the shaft or the clevis assembly is turning independently from one another.

2. If the shaft will turn independently to the nut or the clevis assembly, prior to the next flight, the actuator shall be removed from service and forwarded to HR Textron or one of the HR Textron Service Centers listed in Table 1. Check step 1.F. for condition.

3. If the shaft is not turning independently from the nut or the clevis assembly proceed with step 2.B.4.

4. Check if at least one tab of the lock washer is bent flush against one of the nut flat surface and if at least one tab of the lock washer is bent flush against one of the two flat surfaces of the clevis assembly. Lock washer tab must also be in line with the flat surface of the nut and clevis assembly. If the lock washer tabs are not bent flush against the nut and clevis assembly or are not in line with the flats, proceed with the following steps.

5. If the lock washer tabs are not bent flush against the nut or clevis assembly flat surface, use needle-nosed pliers and make sure the lock washer tab is flush against nut or the flat surface of the clevis assembly.

Use or disclosure of data on this page are subject to the restriction on Page 1.



### November 9, 2005 

# 41011700-67-01

Revision 2 Page 

### 2 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

# SERVICE BULLETIN

6. If the lock washer tab is on the edge or not aligned with a flat surface (nut or clevis assembly). Within the next 300 hours, but not later than April 30, 2006, the actuator shall be removed from service and forwarded to HR Textron or one of the HR Textron Service Centers listed in Table 1. Check step 1.F. for condition.

C. If the servo meets all the requirements of the inspection or if the operator can accomplish the corrective action, the operator may perform the necessary corrective repairs. Remove modification plate from servo and metal-impression stamp or vibro-etch an abbreviated service bulletin number (67-01) on modification plate to identify compliance with this service bulletin. Modification plates are available; HR Textron will provide replacement modification plates if necessary. Corrective action accomplished by HR Textron or approved repair station will have the same identification added to modification plate.

Table 1. HR Textron-Authorized Service Centers

AEM Ltd Helicopter Support Inc. 8 Wilton Road 116 Quarry Road Haine Industrial Estate Trumbull, CT 06611 (USA) Ramsgate, Kent CT12 5HE (England) Tel; 001-(44)-1-843-591-381 Fax; 011-(44)-1-843-592-641 Tel; (203) 416-4300 Fax; (203) 416-4282

JAMCO Corp Stansted Airport 6-11-25 Osawa Mitaka Stansted, Essex CM24 1RB (England) Tel; 011-(44)-1-279-680-030 Fax; 011-(44)-1-279-680-040 Tokyo 181 (Japan) Tel; 011-(81) 422-31-6111 Fax; 011 (81) 422-32-6998

H A S E M o t o r f l u g G m b H Helicopter Accessory Servic e Inc. East Baden-Airpark 10102 Aileron Avenue Gebaude C-312 Pensacola, FL 32506 (USA) D-77836 Rheinmunster, Germany Tel; (850) 456-8339 Fax; (850) 456-5117 Tel; 011 (49) 7229-301-430 Fax; 011 (49) 7229-301-433

HAS West Osterm ans Aero AB Helicopter Accessory Service Inc. West Box 116 10985 Penrose Street SE-190 46 Stockholm-Arlanda Sun Valley, CA 91352 (USA) Tel; (818) 767-2214 Fax; (818) 767-2699 Sweden Tel; 011-(46)-8-593-787-00 Fax; 011-(46)-8-593-787-90

H E L I T R A D E S H E L I T R A D E S 18 Terry Fox Drive Site 5, Box 7, RR 2 Airdrie Airport Vanleek Hill, Ontario, Canada K0B 1R0 Tel; (613) 678-3027 Fax; (613) 678-2776 Airdrie, Canada K0B 1R0 Tel; (403) 912-4658 Fax; (403) 948-6475



### November 9, 2005 

# 41011700-67-01 Use or disclosure of data on this page are subject to the restriction on Page 1.



### Revision 2 Page 

### 3 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622

### Clevis Assembly Figure 1

November 9, 2005 

# 41011700-67-01 Use or disclosure of data on this page are subject to the restriction on Page 1.



### Revision 2 Page 

### 4 of 4

25200 W. Ry e Cany on Road • Santa Clarita, California 91355-1265 • 661/294-6000 • FA X 661/259-9622