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I DATE 

REV 

MODEL AFFECTED: 

SUBJECT: 

ALERT SERVICE BULLETIN ~~ II Hellco r No. 206-06-11 o 

A Subsidiary ofTextron Inc. DATE SEP 7, 2006 ~ 

PAGE 1 of5 ~ 

206A/B and TH-67 Series 

UPPER LEFT-HAND TAILBOOM ATTACHMENT 

HARDWARE, INSPECTION OF 

HELICOPTERS AFFECTED: All Model 206A/B helicopters serial number 4 

through 4449 and model TH-67 helicopters 5101 

through 5237 that had a 407-030-750-103 upper lefthand CRES steel fitting field retrofitted. 

COMPLIANCE: 

DESCRIPTION: 

All Model 206A/B helicopters serial number 4450 

through 4617 and model TH-67 helicopters 5238 

through 5312 that had a 407-030-750-103 upper lefthand CRES steel fitting installed at manufacturing. 

[Model 206A/B helicopters serial numbers 4618 and 

subsequent will have the intent of this bulletin 

accomplished prior to delivery. Model TH-67 

helicopters serial numbers 5313 and subsequent will 

have the intent of this bulletin accomplished prior to 

delivery] 

PART I Within the next 50 hours after receipt of this 

bulletin. 

PART II At the next scheduled 100 Hrs/annual 

inspection, after Part I have been accomplished. 

Bell Helicopter found that on some helicopters having the 407-030-750-103 CRES 

steel fitting installed at the upper left-hand location, the attachment bolt might not meet 

the installation requirement. 
ASB 206-06-110 

Page 2 of 5 

PART I of this bulletin provides instructions to verify if a CRES steel fitting is installed 

at the upper left-hand location and check for the amount of bolt threads exposed. 

PART II of this bulletin provides instructions to replace the upper left-hand bolt if 

required, as indicated in PART I. 

APPROVAL: 

The engineering design aspects of this bulletin are Transport Canada approved. 

MANPOWER: 

Approximately 0.5 man-hour is required to perform PART I and 1 man-hour to perform 

PART II of this bulletin. Man-hours are based on hands-on time, and may vary with 

personnel and facilities available. 

WARRANTY: 

Warranty does not apply for parts or labor associated with this bulletin. 

MATERIAL: 

Required Material: 

The following material is required for the accomplishment of this bulletin and may be 

obtained through your Bell Helicopter Textron Supply Center. 

Part Number 

NAS6606-25 

Nomenclature 

Bolt 

Note: The bolt may not require replacement. Refer to PART I. 

SPECIAL TOOLS: 

None required 

WEIGHT AND BALANCE: 

Not Affected 

Quantity 

1 
ELECTRICAL LOAD DATA: 

Not affected 

REFERENCES: 

BHT-206A/B-MM-5, Maintenance Manual 

PUBLICATIONS AFFECTED: 

BHT-206A/B-SERIES-IPB, Illustrated Parts Breakdown 

BHT-206A/B-MM-5, Maintenance Manual 

ACCOMPLISHMENT INSTRUCTIONS: 

PART I. Left-hand upper fitting and bolt inspection. 

ASB 206-06-110 

Page 3 of 5 

1. Remove the tail boom attachment access door from right side of fuselage forward of 

tailboom bulkhead as per BHT-206A/B-SERIES-MM, chapter 53. 

2. Gain access to upper left-hand tail boom fitting (7, Figure 1 ). 

-NOTEHelicopters 2068 S/N 4450 through subsequent and TH-67 

S/N 5238 through subsequent were delivered with CRES 

steel fitting 407-030-750-103 installed. 

3. For helicopters 206A/B S/N 4 through 4449 and TH-67 S/N 5101 through 5237, 

verify if CRES steel fitting is installed. Those aircraft were originally delivered with 

aluminum fitting that may have been replaced by the CRES fitting and longeron 

assembly 206-031-314-201A. CRES steel fitting (7) may be identified as follows: 

a. The part number 407-030-750-103 maybe stamped on the fitting. 

b. Longeron and aluminum fitting were replaced by longeron assembly 206-031-

314-201A. 

c. The CRES fitting 407-030-750-103 is composite bonded to the longeron and 

the bonding layer might be visible. 
ASB 206-06-11 0 

Page 4 of 5 

d. The CRES fitting 407-030-750-103 is ferrous and can be identified using a 

magnet. 

4. If the helicopter does not have a CRES fitting installed, no further action is 

required. Make an entry in the helicopter records to indicate that this bulletin has 

been accomplished. 

5. For helicopters affected by this bulletin that have a CRES fitting installed, perform 

thread count on the upper left hand attachment bolt (1) as per Figure 1. 

6. If the correct amount of thread is exposed (between 1 and 3), do a torque check. 

Refer to the Maintenance Manual. If the torque is correct, make an entry in the 

helicopter records to indicate that this bulletin has been accomplished. If the torque 

is found below minimum and a replacement bolt (1) is not available at this time, 

adjust the washer (3) quantity as required per Figure 1. Refer to the Maintenance 

Manual and torque as required . Make an entry in the helicopter records to indicate 

that the PART I of this bulletin have been accomplished and that the PART II of this 

bulletin will require accomplishment. 

7. If less than 1 thread is exposed, adjust the washer (3) quantity as required per 

Figure 1. Refer to the Maintenance Manual and torque as required. Make an entry 

in the helicopter records to indicate that this bulletin has been accomplished. 

8. If more than 3 threads are exposed and a replacement bolt (1) is not available at 

this time, adjust the washer (3) quantity as required per Figure 1. Refer to the 

Maintenance Manual and torque as required. Make an entry in the helicopter 

records to indicate that the PART I of this bulletin have been accomplished and 

that the PART II of this bulletin will require accomplishment. 

9. If more than 3 threads are exposed and a replacement bolt (1) is available, 

accomplish PART II of this bulletin. 

PART II. Upper left hand tailboom attachment bolt replacement. 

1. Remove and discard the upper left hand tailboom attachment bolt (1 , Figure 1 ). 

Install new bolt (1) and adjust the quantity of washer (3) as required to ensure 

correct installation as shown on Figure 1 . If serviceable, the nut ( 4) does not 

require replacement. Refer to Maintenance Manual. 

2. 100 hours after installation, do a torque check of the upper left hand tail boom 

attaching hardware (BHT-206AIB-SERIES-MM). 

3. Make an entry in the helicopter records to indicate that this bulletin has been 

accomplished . 
ASB 206-06-110 

Page 5 of 5 

From the end of the bolt, 

a complete thread count starts 

on the back face of the first 

thread groove and moves 

axially to the adjacent groove. 

Three threads shown. 

1. Bolt 

2. Washer, chamfered under bolt head 

3. Washer, as required 

4. Nut 

5. Tailboom 

6. AFT fuselage 

7. Fitting 

NOTES 

5 

ffi Bolt (1) and chamfered washer (2) are to be installed through tailboom (5) and Aft 

fuselage (6). Bolt head and chamfered washer are to be installed on the tailboom side. 

Steel washers (3) are to be installed next to fitting (7) to provide not less than one thread 

and not more than three threads exposed on threaded end of bolt (1 ). 

ffi If thread count is less than one, remove washers as required. 

1 

ffi If thread count is more than three, remove and replace bolt, then readjust number of washers to meet 

requirement of note 1. RAM_oss19_001_c1 

Figure 1: Tailboom Attachment