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### ... 

### ALERT SERVICE BULLETIN



# ~ Bell Helicopter No. 

### 206L-06-141



# ~ DATE A Subsidiary ofTextron Inc. DATE 

### SEP 12, 2006 , REV PAGE 1 of10



# ~



# ~

**~**

**~** MODEL AFFECTED: SUBJECT:
HELICOPTERS AFFECTED: 206L SERIES HORIZONTAL STABILIZER 206-023-119-167, INSPECTION AND REPLACEMENT OF All Model 206L4 listed in Table 1 and all model 206L series that had the stabilizer 206-023-119- 167 replaced after March 01, 2004. TABLE 1: List of affected horizontal stabilizers 206-023-119-167 and the helicopter serial numberthey were installed on at delivery STABILIZER S/N BP1516 BP1519 BP1521 BP1530 BP1533 BP1536 BP1539 BP1542 BP1560 BP1566 BP1569 BP1572 BP1584 BP1587 

### ORIGINAL ALLOCATION 52288 52283 52284 52286 52293 52290 52289 52291 52300 52298 52299 52301 

### Note Note STABILIZER S/N BP1607 BP1608 BP1610 BP1612 BP1615 BP1622 BP1629 BP1630 BP1631 BP1634 BP1643 BP1646 BP1659 

### ORIGINAL ALLOCATION Note Note 52315 52312 52313 52314 

### Note 52316 52318 52317 52319 52320 

### Note 

# ~

**~**

**~** NOTE:

-- 

### These stabilizers were sold in Spare and may have been installed on any fielded 206L series

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEWOWNER AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT **~~~~~.JIIIII".JIIIII"~~.JIIIII"~.JIIIII"~.JIIIII".JIIIII"**ASB 206L-06-141 Page 2 of 10 COMPLIANCE:

DESCRIPTION: PART I AND PART 

### II Within the next 1 00 hours but no later than 30 days after receipt of this bulletin and every 600 hours or annual inspection thereafter until PART Ill is accomplished. PART Ill 

### No later than September 30, 2008.
It has been determined by Bell Helicopter that the horizontal stabilizers 206-023-119- 167 as listed in Table 1 , may have flaws present on the inside surface of the upper and/or lower skin at the tailboom attachment inserts area. Over time the flaws may produce cracks in the upper and/or lower skin PART I of this bulletin provides instructions to verify the serial number ofthe horizontal stabilizer. PART II of this bulletin introduces a first inspection and a recurring 600 hour I 

### annual inspection that have to be performed until PART Ill can be accomplished. PART Ill of this bulletin mandates the replacement of all affected stabilizers. This will be considered as the terminating action for the recurring inspection introduced by PART II of this bulletin APPROVAL: 

### The engineering design aspects ofthis bulletin are Transport Canada approved . MANPOWER: 

### Approximately 2.5 man-hours are required to complete Part I ofthis bulletin. Approximately 4.0 man-hours are required to complete Part II of this bulletin. Approximately 8.0 man-hours are required to complete Part Ill of this bulletin. Manhours are based on hands-on time, and may vary with personnel and facilities available.WARRANTY: ASB 206L-06-141 Page 3 of 10

Owner 

### I Operators of aircraft that have the subject serial numbers installed on their aircraft or that have the one or more of the subject serial numbers in their stock that comply with the instructions outlined in this bulletin are eligible for 100% credit for the replacement part mentioned in the "Required Material" section ofthis bulletin. To Receive This Credit: • Purchase the required part from an approved BHTI supply source. • Comply with this bulletin no later than 30 September, 2008. • Submit a completed MMIR report to BHTI no later than 30 days after completion of this bulletin . Customers that fail to comply with the instructions outlined in this bulletin before September 30, 2008 are not eligible for the special warranty provisions listed above. Exclusions To Warranty: Warranty consideration for parts found in the "Consumable Material" section of this bulletin and labor to inspect or remove and replace the horizontal stabilizer are not a subject of this ASB. 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 Nomenclature Quantity 206-023-119-167 Horizontal stabilizer 1 Consumable Material: The following material is required to accomplish this bulletin, but may not require ordering , depending on the operator's consumable material stock levels. This material may be obtained through you r Bell Helicopter Textron Supply Center.ASB 206L-06-141 Page 4 of 10 Part Number EC2216 B/A TAN N/S 299-947-1 OOTY2CL2G50 MIL-PRF-81733 TY2 PT ACETONE GALLON EWDE072 299-947-110TY3CL1 21 PETROLATUM 13 OZ P-P-1 01 CCCC0046 Notes: Nomenclature Adhesive Adhesive Sealant Acetone (per Q-A-51) Primer Teflon tape (2 inch wide) Petrolatum jelly Aluminum oxide sandpaper Cheesecloth 1 . As an alternate, use Methyl Ethyl Ketone (C-309) 2. As an alternate, use MIL-P-23377 SPECIAL TOOLS: None required WEIGHT AND BALANCE: Weigh and balance is not affected. ELECTRICAL LOAD DATA: Not affected REFERENCES: BHT-206L-MM-5, Maintenance Manual, chapter 53 BHT-206L1-MM-5, Maintenance Manual, chapter 53 BHT-206L3-MM-5 , Maintenance Manual, chapter 53 BHT-206L4-MM-5, Maintenance Manual , chapter 53 Quantity 1 50 g 1 pint I gallon 1 quart 1 roll 13 oz 1 1 Reference C-322 C-317 C-392 C-316(Note 1) C-204(Note2) C-460 C-008 C-423 C-486

TB 206L-00-203 Horizontal Stabilizer Supports 206-023-131-ALL, Installation of PUBLICATIONS AFFECTED: BHT-206L-MM-1, Maintenance Manual, chapter 4 BHT-206L1-MM-1, Maintenance Manual, chapter 4 BHT-206L3-MM-1, Maintenance Manual, chapter 4 BHT-206L4-MM-1, Maintenance Manual, chapter 4ACCOMPLISHMENT INSTRUCTIONS: PART 1: Horizontal stabilizer serial number verification ASB 206L-06-141 Page 5 of 10

1 . Determine if you have an affected horizontal stabilizer as listed in Table 1 . Refer to Figure 1 . Part number and serial number can be found on identification tag (30) that is located in the middle section ofthe trailing edge ofthe stabilizer (7) .-NOTEHorizontal stabilizer does not require to be removed from tailboom .-NOTEDo not damage liquid shim compound between the lower supports (14) and stabilizer (7) . If liquid shim is damaged during removal of the parts, the shimming procedure shall be repeated as described in TB 206L-00-203. 2. Remove the screws (11) and the washers (12) from the L/H and R/H lower supports (14) . 3. Remove LIH and R/H lower supports (14) . 4. Remove screws (2) and the washers (3) attaching R/H finlet (1) to stabilizer (7) . 5. Disconnect position light wiring and carefully remove R/H finlet (1) from stabilizer (7) . 6. Remove nut (28), washers (27) and bolt (26) . Detach control tube (29) from horn (19) . 7. Remove the three screws (23) and washers (24) from support (32) . 8. Remove the two screws (6) and washers (5) from the LIH fitting (4). Removal of the fitting (4) will allow the LIH and R/H elevator to move backward as an assembly and permit its removal without the requirement to remove the LIH fin let (1) . CAUTION Do not drop the fitting (4) during the removal of the elevator (10) because it is free to move at the end of elevator (1 0) .ASB 206L-06-141 Page 6 of 10 9. Slide elevator (1 0) aft until it clears the two pins (9) and remove the LIH and R/H elevator (1 0) as an assembly. 10.Carefully remove the minimum amount of sealant covering the wiring and get access to the identification tag (30). Record the serial number. 11.1f the serial number of the stabilizer is not listed in Table 1, reinstall the elevator (1 0) and stabilizer (7) as follows and make an entry to indicate that this bulletin has been accomplished . a. Position the fitting (4) at the end of LIH elevator (1 0). Slide the elevator assembly (1 0) through the tailboom opening and move forward assuring proper mating of pin (9) with hole provided in elevator (1 0) . b. Attach LIH fitting (4) to fin (1) with washers (5) and screws (6) . c. Attach support (32) to support (25) with the three washers (24) and screws (23) . d. Attach control tube (29) to horn (19) with bolt (26) washers (27) and nut (28). e. Connect position light wiring and reinstall R/H fin let (1) with washers (3) and screws (2). f. Reinstall the L/H and R/H lower supports (14) with washers (12) and screws (11) 0 12. 1f you have an affected horizontal stabilizer, accomplish Part II immediately or Part Ill if a replacement stabilizer is available.ASB 206L-06-141 Page 7 of 10 PART II: Horizontal stabilizer- First inspection and recurring 600 hour I annual inspection 

### 1 . Refer to figure 1 . Inspect the horizontal stabilizer (7) as follows:-NOTE

### Horizontal stabilizer does not require to be removed from tailboom .-NOTE

### Do not damage liquid shim compound between upper and lower supports (13 and 14) and stabilizer (7) . If liquid shim is damaged during removal of the parts, the shimming procedure shall be repeated as described in TB 206L-00-203. 2. Remove the screws (11) and the washers (12) from the LIH and R/H lower supports (14) . 3. Remove LIH and R/H lower supports (14) . 4. Refer to Figure 1 Detail B. Clean and prepare lower surface of the stabilizer for inspection using cheesecloth (C-486) moistened with acetone (C-316). 5. Inspect stabilizer in area of the inserts (31 ), on the lower surfaces for cracks and deformation using a 1 OX power magnifying glass. Inspect the area around each inserts and between inserts for debonding using tap test method . 6. If any damage is found , the stabilizer is not repairable. Accomplish Part Ill immediately. 7. If no damage is found , reinstall LIH and R/H lower supports (14) with screws (11) and washers (12) . 8. Remove the screws (11) and the washers (12) from the LIH and R/H upper supports (13) . 9. Remove LIH and R/H upper supports (13). 10.Refer to Figure 1 Detail B. Clean and prepare upper surface of the stabilizer for inspection using cheesecloth (C-486) moistened with acetone (C-316). 11 . 1nspect stabilizer in area of the inserts (31 ), on the upper surfaces for cracks and deformation using a 1 OX power magnifying glass. Inspect the area around each inserts and between inserts for debonding using tap test method.ASB 206L-06-141 Page 8 of 10 

### 12.1f any damage is found , the stabilizer is not repairable . Accomplish Part Ill immediately. 13. 1f no damage is found , reinstall upper supports (13) with screws (11) and washers (12) . 14.Make an entry in the helicopter records to indicate that Part II of this bulletin has been accomplished and that a recurring 600 hour or annual inspection is required until Part Ill is accomplished . PART Ill: Replacement of horizontal stabilizer-NOTE

### Replacement ofthe horizontal stabilizer requires re-shimming ofthe lower and upper supports (13 and 14). 1 . Remove and retire from service affected horizontal stabilizer. Install a serviceable horizontal stabilizer in accordance with the appropriate Maintenance Manual and TB 206L-00-203 for stabilizer shimming procedure. 2. Make an entry in the helicopter records to indicate that this bulletin has been accomplished1. Fin 2. Screw 3. Thin aluminum washer 4. Fitting 5. Aluminum washer 6. Screw 7. Stabilizer 8. Pin 9. Pin 10. Elevator 11. Screw 11 

### ASB 206L-06-141 Page 9 of 

### 10

12. Thin aluminum washer 13. Support 14. Support 16. Nut 18. Washer 17. Screw 18. Tube 19. Hom 20. Tube 21. Slat 22. Screw 06537002 

### Figure 

### 1 - Horizontal stabilizer, first inspection and 

### 600 hour 

### I annual inspection (Sheet 1 of 2)ASB 206L-06-141 Page 10 of 10

7 23. Screw 24. Thin aluminum washer 29 25. Support 26. Bolt 27. Aluminum washer 28. Nut 29. Tube VIEW A-A 30. Identification tag 31. Inserts 32. Support

## ~:::**~** 

## c

# ··~ c

# f@:o;~L**J** DETAIL B T. .SIN. (38.1 mm) 

## r:::z:zJ INSPECTION AREA Inspect stabilizer on upperand lowersurfaces 06537001

Figure 1 - Horizontal stabilizer, first inspection and 600 hour I annual inspection (sheet 2 of2)