ASB 430-13-51 Page 1 of 5 ECCN EAR99 ALERT SERVICE BULLETIN 430-13-51

PSL7000000051

3 September 2013

MODEL AFFECTED: 430

SUBJECT: P/N 430-001-007-101 , TAIL ROTOR CONTROL TUBE ASSEMBLY MODIFICATION.

HELICOPTERS AFFECTED: Serial numbers 49001 through 49121.

Serial numbers 49122 and subsequent were equipped with control tube assembly P/N 430-001- 007-105 prior to delivery and are not affected by this
bulletin.

Helicopters equipped with c ontrol tube assembly P/N 430-001-007-105 per Technica l Bulletin 430-04-35 are not affected by this bulletin.

COMPLIANCE: As soon as practical but no later than next 50 hour inspection or 31 October 2013 whichever occurs
first.

DESCRIPTION:

Bell Helicopter has receiv ed 2 reports of P/N 430-001-007- 101 control tube assembly bonded clevis failure. Investigation reveal ed that the clevis failed due to fatigue caused by oscillation of the control tube assembly.

This Alert Service Bulletin introduces a one -time inspection of control tube assembly P/N 430-001-007-101 to verify if chaffing damage exists on the tube. In addition, procedure is provided to apply some lead tape to the control tube. This modification will reduce the amplitude of radial vibrat ion and prevent contac t of the tube with adjoining parts and structure.ASB 430-13-51 Page 2 of 5 ECCN EAR99 Previously, Technical Bull etin 430-04-35 was issued to replace the P/N 430-001-007- 101 with a new -105 control tube assembly. As soon as sufficient parts become available, a revision to this bulletin will require mandatory removal from service of all P/N 430-001-007-101 c ontrol tubes.

Applicability of this bulletin to any P/N 430-001-007-101 spare part shall be determined prior to its instal lation on an affected helicopter.

APPROVAL:

The engineering design aspects of this bulletin are Transport Canada Civil Aviation (TCCA) approved.

CONTACT INFO:

For any questions regarding this bulletin, please contact:

Bell Helicopter Product Support Engi neering - Intermediate Helicopters Tel: 450-437-2077 / 1-800-463- 3036 / pseinter@bh.com

MANPOWER:

Approximately 2.0 man-hours are required to complete this bu lletin. This estimate is based on hands-on time, and may vary wit h personnel and facilities available.

WARRANTY:

Owners / Operators of Bell Helicopters who comply with the instructions in this Bulletin will be eligible to receive prorated/non prorated r eplacement parts as applicable, listed in the bulletin. Bell He licopter has recently introduced enhancements to the VISTA Portal which allocates specif ic warranty entitlement for an aircraft by serial number. The Product Service Letter (PSL) number which will be listed below the bulletin number on the introduction page is going to be a required field when submitting a claim for replacement parts, labor , and/or freight. If you receive an ASB or TB that does not have a PSL number, then there is no warr anty entitlement for that
bulletin.

Labor entitlement: Yes /No $0.00

To receive parts, labor, and/or freight under warranty:

 Comply with the instructions contained in this Bulletin no later than the applicable date in the “compliance section”.ASB 430-13-51 Page 3 of 5 ECCN EAR99  If there is a PSL number identif ied in the bulletin you will be required to enter this PSL num ber which will va lidate warranty
entitlement for the selected airc raft. Please ensure that you use
the Bulletin tab on the warranty section in VISTA to file your
claim.

NOTE: Customers who fail to comply with the inst ructions in this Bulletin before the 31 October 2013 are not eligible for the special warrant y listed above.

MATERIAL:

Required Material: The following material is required for the ac complishment of this bulletin and may be obtained through your Bell Helico pter Textron Supply Center.

Part Number Nomenclature Qty

2000-06610-00 Tape 2 inch wide 1 Roll

Consumable Material: The following material is required to a ccomplish this bulletin, but may not require ordering, depending on the operator ’s consumable material stock levels. This material may be obtained through your Bell He licopter Textron Supply Center.

Part Number Nomenclature Qty Reference *

2110-06257-00 Methyl Ethyl Ke tone (Note 1) A/R C-309

2100-00061-00 Acetone A/R C-316

Note 1: As an alternate to Methyl Ethyl Ketone, Acetone C-316 may be used.

* C-XXX numbers refer to the co nsumables list in BHT-ALL-SPM Standard Practices Manual

SPECIAL TOOLS:

None required.

WEIGHT AND BALANCE:

Negligible.

ELECTRICAL LOAD DATA:

Not affected.ASB 430-13-51 Page 4 of 5 ECCN EAR99 REFERENCES:

BHT-430-MM Maintenance Manual BHT-430-CR&O Component Repa ir and Overhaul Manual Technical Bulletin 430-04-35, Rev B dated March 20, 2009

PUBLICATIONS AFFECTED:

None affected.

ACCOMPLISHMENT INSTRUCTIONS:

1. Prepare helicopter for maintenance.

2. Remove panels and covers as required to gain access to tail rotor control tube P/N
430-001-007-101. Refer to BHT-430-MM.

3. Disconnect control tube assembly P/N 430-001-007-101 from forward lever and aft
bellcrank. Remove control tube a ssembly from the helicopter.

4. Thoroughly inspect the control tube assembly for damage. Refer to BHT-430- CR&O-4, Chapter 67, Paragraphs 67-4, 67-5 and Figure 67-1 for damage limits, repair and refinish procedure. Make su re that the bonded clevis is exempt of damage and is securely bonded to the control tube

a. If the control tube assembly meets the criteria of the inspection/repair listed above, proceed to step 5.

b. If the damage(s) on the control tube exce ed the listed limits, submit a detailed description of the damage(s) to PSEINTER@BH.COM with a sketch of the tube including size, dimension and exact lo cation of each damage on the tube. Ensure that you indicate the forward and aft position of the control tube. Bell Helicopter Engineering will analyze the damages on the tube and determine if it may return to service.

5. Modify control tube assembly as follows:

a. The control tube (without the clevis es) measures 72.15 inches overall. Measure and using a pen or pencil, lightly mark the center of the tube.

b. Measure and cut quantity of 4, 30 inch long pieces fr om the roll of tape, P/N 2000-06610-00. DO NOT remove the peel ply from the tape at this time.

c. Measure and using a pen or pencil, ma rk the center of each piece of tape.

d. Using a lint free cloth, wipe the entire surface of the tube using MEK (C-309) to remove the oily film.ASB 430-13-51 Page 5 of 5 ECCN EAR99 e. Remove the peel ply from one piece of tape and carefully app ly it on the tube making sure that you align t he center mark of the tape with the center mark of the tube. The tape must be in full contac t with the surface of the tube without kinks or air bubbles. Rubbing the t ape down with a smooth edged plastic piece or similar object will hel p the tape adhere better and conform to the tube
surface.

f. Remove the peel ply from the second pi ece of tape and apply it precisely over the first piece of tape previously bonded to the tube per step e. The tape must be in full contact with the tape already on the tube without kinks or air bubbles. Rubbing the tape down with a smooth edg ed plastic piece or similar object will help the tape adhere better and c onform to the surface.

g. Remove the peel ply from the third piece of tape and carefully apply it on the tube, 180 degrees from the tape applied in step e a nd step f above, making sure that you align the center mark of t he tape with the center mark of the tube. The tape must be in full contact with the su rface of the tube without kinks or air bubbles. Rubbing the tape down with a smooth edged plastic piece or similar object will help the tape adhere better and conform to the tube surface.

h. Remove the peel ply from the fourth piece of tape an d apply it precisely over the third piece of tape pr eviously bonded to the tube per step g. The tape must be in full contact with the tape already on the tube without kinks or air bubbles. Rubbing the tape down with a smooth edg ed plastic piece or similar object will help the tape adhere better and c onform to the surface.

6. Install the modified control tube assemb ly in the helicopter. Reconnect the control
tube to the forward lever and aft bellcrank. Refer to BHT-430-MM.

7. Reinstall panels and covers previ ously removed. Refer to BHT-430-MM.

8. Make an entry in the helicopter logbook a nd historical service records indicating compliance with this Alert Service Bulletin.