DATE 

ALERT SERVICE BULLETIN 

REVISION NOTICE 

AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT 

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER

JUN 10, 2009 

TO: All Owners/Operators of Bell 206L series Helicopters

SUBJECT: Revision “A” to Alert Service Bulletin 206L-09-157: DISC ASSEMBLY 

101584-2, RECALL OF 

Revision “A” to this bulletin adds the date when Bell Helicopter has started to sell disc 

assembly 101584-2 through Spares to the DESCRIPTION section. 
NO. 

DATE 

PAGE 

DATE 

REV 

 

 

 

ALERT SERVICE BULLETIN 

206L-09-157 

JUN 10, 09 APR 20, 2009 

AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT 

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER

 A 1 of 4 

MODEL AFFECTED: 206L series

SUBJECT: DISC ASSEMBLY 101584-2, RECALL OF 

HELICOPTERS AFFECTED: 206L Helicopters serial number 45004 through 

45153 and 46601 through 46617. 

 

206L-1 Helicopters serial number 45154 through 

45790. 

206L-3 Helicopters serial number 51001 through 

51612. 

206L-4 Helicopters serial number 52001 and 

subsequent. 

[All 206 helicopters delivered new form factory had 

disc assembly P/N 32721-1 installed at delivery] 

-NOTEEach laminate of disc assembly 101584-2 is ink stamped 

with P/N 101584-1. 

COMPLIANCE: PART I: For disk assembly P/N 101584-2 in spares 

stock, immediately after receipt of this bulletin. 

PART II: For disk assembly P/N 101584-2 installed 

on helicopter, within the next 100 hours after receipt 

of this bulletin but not to exceed 30 days. 

DESCRIPTION: 

Bell Helicopter found that new disc assembly P/N 101584-2 sold through Spares 

beginning March 2009 as an alternate to P/N 32721-1 does not conform to the 

approved Engineering. This Alert Service Bulletin mandates the removal from service 

of all disc assemblies P/N 101584-2. 

A 
ASB 206L-09-157 

Page 2 of 4 

APPROVAL: 

The engineering design aspects of this bulletin are Transport Canada Civil Aviation 

(TCCA) approved. 

MANPOWER: 

No additional man-hours are required to accomplish PART I of this bulletin. 

Approximately 1.0 man-hour is required to replace each disc assembly that is affected

by the ACCOMPLISHMENT INSTRUCTIONS PART II section of this bulletin. Manhours are based on hands-on time, and may vary with personnel and facilities 

available. 

WARRANTY: 

Owners / Operators of Bell Helicopters who comply with the instructions in this Bulletin 

will be eligible to receive a 100% credit towards replacement Disc Assemblies part 

number 32721-1. 

To receive this credit: 

• Comply with the instructions contained in this Bulletin no later than the applicable 

hours in the “compliance section” of this ASB, or no later than the March 31, 2010.

• Purchase replacement parts from a Bell approved source. 

• Submit an MMIR to the Bell Warranty Department referencing this ASB. 

Customers who fail to comply with the instructions in this Bulletin before the March 31, 

2010 are not eligible for the special warranty credit listed above. There is no 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 Nomenclature Quantity

32721-1 DISC ASSEMBLY A/R 
ASB 206L-09-157 

Page 3 of 4 

SPECIAL TOOLS: 

None required 

ELECTRICAL LOAD DATA: 

Not affected 

REFERENCES: 

BHT-206L-MM, Maintenance Manual 

BHT-206L1-MM, Maintenance Manual 

BHT-206L3-MM, Maintenance Manual 

BHT-206L4-MM, Maintenance Manual 

PUBLICATIONS AFFECTED: 

None affected 

ACCOMPLISHMENT INSTRUCTIONS:

PART I: For disc assembly in spares stock 

-NOTEEach laminate of disc assembly 101584-2 is ink stamped 

with P/N 101584-1. 

1. Verify if disk assemblies in spare stock are identified with P/N 101584-2. If a disc 

assembly is identified with P/N 101584-2, refer to the WARRANTY section of this 

bulletin. 

PART II: Disc assembly installed on Helicopter 

-NOTEEach laminate of disc assembly 101584-2 is ink stamped 

with P/N 101584-1. 

1. Review helicopter records to determine if Disc Assembly P/N 101584-2 has been 

installed on the helicopter. 
ASB 206L-09-157 

Page 4 of 4 

a. If helicopter records indicate that a Disc Assembly P/N 101584-2 has been 

installed, proceed with step 2. 

b. If helicopter records review indicates that no Disc Assembly P/N 101584-2 has 

been installed, proceed with step 3. 

2. Gain access to the tail rotor driveshaft system and replace Disc Assembly P/N 

101584-2 with serviceable Disc Assembly P/N 32721-1 (BHT-206L-MM, Chapter 

66) (BHT-206L1-MM, Chapter 66) (BHT-206L3-MM, Chapter 65) (BHT-206L4-MM, 

Chapter 65). 

3. Make a log book entry to indicate that this bulletin has been accomplished.