ALERT SERVICE BULLETIN 205-21-119
20 December 2021
MODEL AFFECTED: 205A/205A-1
SUBJECT: MAIN ROTOR SCISSORS & SLEEVE HUB
ASSEMBLY COLLECTIVE 204-011-405-013
IDENTIFICATION
HELICOPTERS AFFECTED: Serial numbers 30001 through 30065, 30067
through 30165, 30167 through 30187, 30189
through 30296 and 30298 through 30332.
COMPLIANCE: PART I: Within 100 flight hours or 3 months after the
release date of this bulletin.
PART II: At the next scheduled removal or no later
than 600 flight hours / 12 months after
accomplishment of PART I.
DESCRIPTION:
Bell has been made aware that some scissors & sleeve Hub Assembly Collectives 204-
011-405-013 were delivered without a serial number or with an ink-stamped serial and
part number only. Since the “Hub Assembly” is a life-limited item listed in the
Maintenance Manual Chapter 4, a permanently marked part number and serial number
shall be assigned to it.
PART I of this bulletin mandates the inspection of the Hub Assembly 204-011-405-013
for the presence of a serial and part number as well as proper documentation for
accumulated flight time tracking.
PART II of this bulletin provides instructions to correctly mark the Hub Assembly part
and serial numbers and if non existing, create documentation for component tracking.
ASB 205-21-119
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The 204-011-405-101 is the latest Hub Assembly configuration procurable through Bell
Spares as a direct replacement for the Hub Assembly 204-011-405-013.
Applicability of this bulletin to any spare part shall be determined prior to its installation
on an affected helicopter.
APPROVAL:
The engineering design aspects of this bulletin are FAA approved for FAA certified
helicopters as listed in the applicable Type Certificate Data Sheet. For non FAA certified
helicopters, the engineering design aspects of this bulletin are Bell Engineering
approved.
CONTACT INFO:
For any questions regarding this bulletin, please contact:
Bell Product Support Engineering
Tel: 1-450-437-2862 / 1-800-363-8023 / productsupport@bellflight.com
MANPOWER:
Approximately 1.0 man-hour is required to complete PART I of this bulletin.
Approximately 2.0 man-hours are required to complete PART II of this bulletin. This
estimate is based on hands-on time and may vary with personnel and facilities available.
WARRANTY:
There is no warranty credit applicable 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 Supply Center.
Part Number Nomenclature Qty (Note)
204-011-405-101 Hub Assembly Collective 1 (1)
NOTE 1: Required only if the Hub Assembly 204-011-405-013 has reached the life
limit published in the 205 Maintenance Manual (BHT-205A1-MM), Chapter 4.
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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 your Bell Supply Center.
Part Number Nomenclature Qty (Note) Reference *
2230-00425-00 Primer, Epoxy Polyamide 1PT (1) C-204
* C-XXX numbers refer to the consumables list in the BHT-ALL-SPM, Standard Practices Manual
NOTE 1: The quantity indicated is the format the product is delivered in. Actual quantity
required to accomplish the task may be less.
SPECIAL TOOLS:
None required.
WEIGHT AND BALANCE:
Not affected.
ELECTRICAL LOAD DATA:
Not affected.
REFERENCES:
BHT-205A1-IPB Illustrated Parts Breakdown
BHT-205A1-MM Maintenance Manual
BHT-ALL-SPM
PUBLICATIONS AFFECTED:
BHT-205A1-IPB Illustrated Parts Breakdown
ACCOMPLISHMENT INSTRUCTIONS:
PART I. Hub Assembly 204-011-405-013 inspection for proper serial and part number
marking and Historical Service Record.
1. Prepare the helicopter for maintenance.
2. Confirm if there is a Historical Service Record (HSR) for the Hub Assembly (204-
011-405-013) and that it contains the serial and part numbers.
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3. Gain access to the Hub Assembly 204-011-405-013 and inspect for the presence of
part number and serial number matching the Historical Service Record (HSR) at the
location shown on Figure 1.
4. If the Hub Assembly is not correctly marked, as shown in Figure 1, proceed with
PART II.
5. If the Hub Assembly is correctly marked, as shown in Figure 2, make an entry in the
helicopter logbook and historical service records indicating findings and compliance
with Part I of this Alert Service Bulletin.
6. If Part II of this ASB is not going to be accomplished immediately, make an entry in
the helicopter logbook and historical service records indicating compliance with Part
I of this Alert Service Bulletin with an annotation to accomplish Part II within the
required compliance time stated in this ASB.
PART II. Hub Assembly part and serial number marking.
1. Prepare the helicopter for maintenance and gain access to the Hub Assembly.
CAUTION
Maximum depth of vibro-etching or dot-peening shall not
exceed 0.005-inch (.127 mm). Part and serial numbers shall
be marked in the scalloped area of the hub as shown in Figure
2 of this ASB; to a minimum height of 0.062-inch (1.57 mm)
and no closer than 0.100-inch (2.54 mm) to any edge.
2. If the Hub Assembly has an ink-stamped part and serial number matching the HSR
(refer to example shown in Figure 1), permanently mark the part and serial number
on the Hub Assembly by vibro-etching or dot-peening (Figure 2).
3. If the Hub Assembly does not have a part number and serial number, create a unique
serial number for each Hub Assembly. Using one or two prefix letters consistent with
the company name of the operator or repair facility accompanied by a dash and 4 or
5 digits is considered as an industry serial number marking standard. Vibro-etch or
dot-peen the Hub Assy with the part number and the assigned serial number (Figure
2).
For example, Papa Tango Aviation Inc. could use “204-011-405-013 / PT-01234”
4. After marking the part and serial number identification, apply brush cadmium plating
solution (C-108) to the affected area (BHT-ALL-SPM). As an alternate and if brush
cadmium plating isn’t available, apply two coats of polyamide epoxy primer (C-204).
5. If no Historical Service Record exists for the Hub Assy, create one as follows:
a. Print a blank form from www.bellhelicopter.net under the “GENERAL INFO” tab.
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b. Enter the Hub Assembly part number and the serial number created above.
c. Add the following note beside the serial number: “Serial number created as per
ASB 205-21-XXX”
d. Enter the actual flight hours or the flight hour value calculated.
e. Ensure the Hub Assembly information is entered on the HSR.
6. The Hub Assembly 204-011-405-013 is a life-limited item that should have been
tracked by the operator even if the part was not correctly identified.
Contact Bell Product Support immediately if any hub assemblies are found without
installation history and/or unknown accumulated total flight time; these shall be
addressed on a case-by-case basis.
7. Make an entry in the helicopter logbook and historical service records indicating
findings and compliance with this Alert Service Bulletin.
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Figure 1 – Hub Assembly Ink-Stamped Part Number and Serial Number
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Figure 2 – Vibro-Etched Part Number and Serial Number Location
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