# Leonardo Alert Service Bulletin 412-157: No revision named

- Rights: © Leonardo S.p.A. Filed by the FAA in regulations.gov docket FAA-2021-0608, the docket of AD 2021-20-12. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Leonardo Alert Service Bulletin 412-157](https://openairdocs.org/service-documents/leonardo/sb-412-157.md)
- Title as filed: Leonardo Helicopters Emergency ASB No. 412-157
- Pages: 28
- PDF: https://openairdocs.org/files/sha256/df/48/df48eba167f34b031385f618b08e824a991e452c29c946ae69f3a69cd3a27148
- Page: https://openairdocs.org/service-documents/leonardo/sb-412-157/file/df48eba167f3

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

N°  412-157 
DA TE:  December 17, 2019 
REV. :  / - M arch 15, 2017 
Pa ge 1 of 27 
TITLE 
ATA 25 - EMERGENCY FLOAT ASSY P/N 412-4600-03-101 & -102, FLOAT SUPPLY 
H
OSES INSPECTION OF 
REVISION LOG 
New Issue 
Leonardo S.p.A.
Via Giovanni Agusta, 520
21017 Cascina Costa di Samarate (VA) Italy
Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595
An appropriate entry should be made in the aircraft log book upon accomplishment.
If ownership of aircraft has changed, please, forward to new owner.
EMERGENCY ALERT
SERVICE BULLETIN

### Page 2

S.B. N°412-157 EMERGENCY ALERT 
 DATE: December 17, 2019 
Page 2 of 27 REVISION: / 
1. PLANNING INFORMATION 
A. EFFECTIVITY 

 All AB412 / AB412EP helicopter equipped with Emergency Float Assy listed in 
Table 1 (Ref. kit 412-4600-04-all dash). 

 Spare Emergency Float Assy listed in Table 1 (Ref. kit 412-4600-04-all dash), kept 
in stock. 
P/N S/N Description 
412-4600-03-101 
(Float P/N 412-4600-03-107, 
Manufacturer P/N 215271-0) 
all serial number up to 
S/N 117 Emergency Float Assy LH 
412-4600-03-102 
(Float P/N 412-4600-03-108, 
Manufacturer P/N 215349-0) 
all serial number up to 
S/N 121 Emergency Float assy RH 
Table 1 
NOTE 
Emergency Flotation Assy are NOT affected if: 
• SAFRAN Service Bulletin SB 025-69-19 is marked 
on the external identification label of EFS, and/or  
• Service Bulletin SB 412-157 is recorded on the 
component Log Card or equivalent record;  
even if they have a S/N listed in above Table 1. 

 All Float Supply Hoses P/N 215342-0 manufactured until April 2015, kept in 
stock and not installing a piece of green heat-shrinkable sleeve. 
NOTE 
The manufacturing date of the Float Supply Hose is 
found on the identification label of the hose (refer to 
Figure 1 in Annex A for location). 
B. COMPLIANCE 

 Within and not later than fifteen (15) FH after the issue of this Service Bulletin, for 
all helicopters equipped with Emergency Float Assy listed in below Table 2. 
P/N S/N Description 
412-4600-03-101 
(Float P/N 412-4600-03-107, 
Manufacturer P/N 215271-0) 
99, 100, 110 Emergency Float Assy LH 
412-4600-03-102 
(Float P/N 412-4600-03-108, 
Manufacturer P/N 215349-0) 
105, 106, 107, 110, 119 Emergency Float assy RH 
Table 2

### Page 3

S.B. N°412-157 EMERGENCY ALERT 
DATE: December 17, 2019 
REVISION: / Page 3 of 27 

 Within and not later than three-hundred (300) FH or during the next scheduled 
eighteen (18) months inspection, whichever occurs first after the issue of this Service 
Bulletin, for all helicopters equipped with: 
• Emergency Float Assy with S/N not listed in Table 2 above;  

 Within and not later than the next eighteen (18) months or before helicopter 
installation, whichever occurs first, after the issue of this Service Bulletin, for: 
• all Emergency Float Assy listed in Table 1 above, kept in stock 
• all Float Supply Hose P/N 215342-0 kept in stock 
C. CONCURRENT REQUIREMENTS 
N.A. 
D. REASON 
This Service Bulletin is issued in order to prescribe the check of the proper air flow 
through the Float Supply Hoses P/N 215342-0, part of the LH/RH Emergency Float 
Assy P/N 412-4600-03-101/-102. 
E. DESCRIPTION 
During maintenance operations on an Emergency Float System (EFS), not installed on 
AB412 fleet, the third compartment of the left forward float did not inflate. The supply 
hose ensuring the gas flow from the cylinder assembly to the related float 
compartment was found blocked. 
The investigations revealed that the same issue could affect the supply hoses  
P/N 215342-0 applicable to AB412 EFS. 
To prevent any event of lack of inflation of one or more floats in case of ditching, a 
special inspection shall be performed to in-service and spare float supply hoses to 
verify that each component is fully operational. 
This Service Bulletin provides the necessary instruction to inspect the Float Supply 
Hoses P/N 215342-0 in accordance with SAFRAN Aerosystems Service Bulletin SB 
025-69-19 Revision 00 enclosed as Annex A of this document.  
F. APPROVAL 
The technical content of this Service Bulletin is approved under the authority of DOA 
nr. EASA.21.J.005. For helicopters registered under other Aviation Authorities, before 
applying the Service Bulletin, applicable Aviation Authority approval must be checked 
within Leonardo Helicopters customer portal.

### Page 4

S.B. N°412-157 EMERGENCY ALERT 
 DATE: December 17, 2019 
Page 4 of 27 REVISION: / 
EASA states mandatory compliance with inspections, modifications or technical 
directives and related time of compliance by means of relevant Airworthiness 
Directives. 
If an aircraft listed in the effectivity embodies a modification or repair not LHD certified 
and affecting the content of this Service Bulletin, it is responsibility of the 
Owner/Operator to obtain a formal approval by Aviation Authority having jurisdiction on 
the aircraft, for any adaptation necessary before incorporation of the present Service 
Bulletin. 
G. MANPOWER 
To comply with this Service Bulletin ten (10) minutes are deemed necessary. 
MMH are based on hands-on time and can change with personnel and facilities 
available. MMH are not comprehensive of the overall hours necessary to get access to 
work areas and to remove all the equipment that interferes with the application of the 
prescribed instructions. 
H. WEIGHT AND BALANCE 
N.A. 
I. REFERENCES 
1) PUBLICATIONS 
 DESCRIPTION PART 
AB412-MM   25-61-04 
Paragraph 2 
Maintenance Manual – Emergency floats 
kit (P/N 412-4600-04) - Removal - 
AB412-MM   25-61-04 
Paragraph 3 
Maintenance Manual – Emergency floats 
kit (P/N 412-4600-04) – Folding 
Procedures 
- 
AB412-MM   25-61-04 
Paragraph 4 
Maintenance Manual – Emergency floats 
kit (P/N 412-4600-04) - Installation - 
25-69-29 Aerazur Component Maintenance Manual 
Emergency Flotation System for AB412 
helicopter  
- 
2) ACRONYMS 
CMM Component Maintenance Manual 
DOA Design Organization Approval 
EASA European Aviation Safety Agency 
EFS Emergency Float System 
FH Flight Hours 
IPC Illustrated Part Catalog

### Page 5

S.B. N°412-157 EMERGENCY ALERT 
DATE: December 17, 2019 
REVISION: / Page 5 of 27 
LH  Left  
LHD Leonardo Helicopters Division 
LS Local Supply 
MM Maintenance Manual 
MMH Maintenance Man Hours 
N.A. Not Applicable 
P/N Part Number 
RH Right 
SB Service Bulletin 
3) ANNEX 
Annex A SAFRAN SB 025-69-19 Revision 00. 
J. PUBLICATIONS AFFECTED 
N.A. 
K. SOFTWARE ACCOMPLISHMENT SUMMARY 
N.A.

### Page 6

S.B. N°412-157 EMERGENCY ALERT 
 DATE: December 17, 2019 
Page 6 of 27 REVISION: / 
2. MATERIAL INFORMATION 
A. REQUIRED MATERIALS 
1) PARTS 
# P/N ALTERNATIVE P/N DESCRIPTION Q.TY LVL NOTE LOG P/N 
1 215342-0   Float supply hose AR . (1) - 
2) CONSUMABLES 
The following consumable materials, or equivalent, are necessary to accomplish this 
Service Bulletin: 
# Spec./LHD code number DESCRIPTION Q.TY NOTE PART 
2 35163 Tape adhesive – width 50 mm, as per MIL-T-43115 AR (2)  
3 919012 (Cord R721 A805) Lacing cord AR (2)(4) - 
4 919019 (Cord R6109 A665) Lacing cord AR (2) (4) - 
5 919020 (Cord R709 A535) Lacing cord AR (2) (4) - 
6 919009 (Cord R6301 A665) Lacing cord AR (2) (4) - 
7 939024 MASTINOX paste AR (2) - 
8 00468 (Velcro R6315 A050) Pile Velcro Tape, width 25 mm AR (2) - 
9 Commercial Heat shrinkable sleeve, green color AR (2) - 
10 01040 O-rings (14,00X1,78 20B7) AR (2) (3) - 
11 961068 O-rings (15,60X1,78 20B9) AR (2) (3) - 
3) LOGISTIC MATRIX 
N.A.  
NOTE 
(1) This item is provided to approved operators only if the blockage of the installed 
Float Supply Hose occurs during the inspection procedure described in 
Accomplishment Instructions. 
(2) Item to be procured as local supply. 
(3) Item requested only if damaged during Float Supply Hose removal / installation. 
(4) To be ordered for LH/RH Emergency Float Assy folding procedure. 
B. SPECIAL TOOLS 
The following special tools, or equivalent, are necessary to accomplish this Service 
Bulletin: 
# P/N DESCRIPTION Q.TY NOTE PART 
12 Commercial 
Plastic cable tie, 
300 mm min. x 5 mm max. 
(11.811 in min. x .196 in max.) 
1  - 
13 412-0960-26-101 Folding kit P/N 215996-0 1 (B1)(B2) - 
14 Commercial Oil and moisture free compressed air source with 20-micron filter 1 (B1) -

### Page 7

S.B. N°412-157 EMERGENCY ALERT 
DATE: December 17, 2019 
REVISION: / Page 7 of 27 
SPECIAL TOOLS NOTE 
 To be ordered for Emergency Float Assy unfolding/folding procedure. (B1)
  Folding kit P/N 215996-0 including: (B2)
 N° 2 Lacing Tools P/N 215645  •
 N° 5 Inflation / deflation tools P/N 212684 •
 N° 1 Positioning tool P/N 215644 •
 N° 1 Lacing kit P/N 215992 •
C. INDUSTRY SUPPORT INFORMATION 
WARRANTY: Owners/Operators who comply with the instructions of this Service 
Bulletin no later than the applicable date in the “Compliance” section will be eligible to 
receive REQUIRED MATERIALS on free of charge basis, except for Consumable 
Materials and Special Tools.  
NOTE: Customers who fail to comply with the instructions in this Service Bulletin 
before the compliance date are not eligible for the aforementioned special policy.  
Please Issue relevant MMIR form to your Warranty Administration Dpt.

### Page 8

S.B. N°412-157 EMERGENCY ALERT 
 DATE: December 17, 2019 
Page 8 of 27 REVISION: / 
3. ACCOMPLISHMENT INSTRUCTIONS 
GENERAL NOTES 
Place an identification tag on all components that 
are re-usable, including the attaching hardware that 
has been removed to gain access to the 
modification area and adequately protect them until 
their later re-use. 
NOTE 
Skip step 1, 2, 4, 9, 10, 12 for the for Emergency 
Float Assy P/N 412-4600-03-101/-102 kept in 
stock. 
NOTE 
Skip step 1 thru 5, 7 thru 10 and 12 for the for Float 
Supply Hose P/N 215342-0 kept in stock. 
1. In accordance with the instructions given in the AB412-MM Maintenance Manual 
prepare the helicopter on ground for a safe maintenance. Disconnect the battery and 
any source of electrical power supply. 
CAUTION 
All installations must be handled with extreme care 
during all working phases to prevent equipment 
damage. 
NOTE 
Instructions in below steps 2 thru 11, are the same for 
both side of installation (LH and RH). 
2. Remove the Load Tube with related Float and Gas C ylinder from the helicopter, in 
accordance with MM Section 25-61-04, Paragraph 2. 
3. Disconnect the Cylinder Supply Hose from Float Supply Hose P/N 215342-0 and 
temporarily  install protection plug to prevent line contamination. 
4. Unfold the affected Float as follows: 
4.1 Open the Cover by unfastening the VELCRO strips 
4.2 Breaking / remove the break cords 
4.3 Release (slip them) the Front and Rear Caps 
4.4 Unfold the Float

### Page 9

S.B. N°412-157 EMERGENCY ALERT 
DATE: December 17, 2019 
REVISION: / Page 9 of 27 
5. Remove the Float Supply Hose P/N 215342-0 from the Float, in accordance with  
CMM 25-69-29 Section “Assembly” Paragraph 2.C.1.b, with reverse procedure. 
6. Inspect and reidentify the Float Supply Hose P/N 215342-0, in accordance with Annex A, 
Paragraph 3.C “Procedure”. 
7. Reidentify the Float, in accordance with Annex A, Paragraph 3.C “Procedure”. 
8. Protect metallic part and install the Float Supply Hose P/N 215342-0 on the Float, in 
accordance with CMM Section “Assembly” Paragraphs 2.C.1.a and 2.C.1.b.  
9. Fold the Float, in accordance with MM 25-61-04, Paragraph 3. 
10. Install the Load Tube with related Float and Gas Cylinder to the helicopter, in 
accordance with applicable instruction of MM Section 25-61-04, Paragraph 4. 
11. Record the compliance with this Service Bulletin on the component log card or 
equivalent record. 
12. Return the helicopter to flight configuration and record for compliance with this Service 
Bulletin on the helicopter logbook. 
13. Send the attached compliance form to the following mail box: 
 absereng.aw@leonardocompany.com 
As an alternative, gain access to My Communications section on Leonardo WebPortal 
and compile the “Service Bulletin Application Communication”.

### Page 10

S.B. N°412-157 EMERGENCY ALERT 
 DATE: December 17, 2019 
Page 10 of 27 REVISION: / 
 
 
 
 
 
 
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### Page 11

S.B. N°412-157 EMERGENCY ALERT 
DATE: December 17, 2019 
REVISION: / Page 11 of 27 
ANNEX A 
SAFRAN SB 025-69-19 REVISION 00 
EQUIPMENT/FURNISHINGS (ATA 25) EMERGENCY FLOTATION 
SYSTEMS INSPECTION OF FLOAT SUPPLY HOSES

### Page 12 (OCR)

S SAFRAN  ZODIAC AEROSPACE SERVICES
TECHNICAL PUBLICATION DEPARTMENT
61 rue Pierre Curie - CS20001
78373 PLAISIR CEDEX - FRANCE
Phone:  (33) 1 61 34 23 23
Fax:  (33) 1 61 34 21 13
Web site: www.safran-aerosystems.com/customers
TRANSMITTAL LETTER
This Transmittal Letter applies to the original issue, dated NOV 22/19, of Service Bulletin 025-69-19.
REASON FOR REVISION:
Not applicable.
REVISION SEQUENCE:
Initial issue ...: NOV 22/19
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 1 / 2
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
Page 12 of 27  REVISION: /

### Page 13 (OCR)

- SAFRAN  ZODIAC AEROSPACE SERVICES
THIS PAGE INTENTIONALLY LEFT BLANK
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 2/2
B. Nº412-157 EMERGENCY ALER
АЛЕ: December 17, 20°
REVISION: /  Page 13 of 27

### Page 14 (OCR)

• SAFRAN  AEROSYSTEMS
SERVICE BULLETIN SUMMARY
1. PLANNING INFORMATION
A. EFFECTIVITY...
B.  CONCURRENT REQUIREMENTS.
C.  REASON .....
D. DESCRIPTION.
E.  COMPLIANCE
F.  APPROVAL...
G.  MANPOWER..
H. WEIGHT AND BALANCE.
ELECTRICAL LOAD DATA.
SOFTWARE ACCOMPLISHMENT SUMMARY ..
K.  REFERENCES...
L.  PUBLICATIONS AFFECTED
M. INTERCHANGEABILITY..
2.  MATERIAL INFORMATION.
A. MATERIAL - PRICE AND AVAILABILITY..
B.  INDUSTRY SUPPORT INFORMATION ...
C. LIST OF COMPONENTS.
D. SUBCOMPONENTS TO BE RE-IDENTIFIED..
E. TOOLING...
F.  SPECIAL TOOLS  . 7
3. ACCOMPLISHMENT INSTRUCTIONS..
A.  B.  GENERAL..  PREPARATION  00. 00. 0.
C. PROCEDURE.
D. RE-IDENTIFICATION
E.  TEST ....
F. CLOSE-UP
FIGURE 1
FIGURE 2
FIGURE 3
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  SBS PAGE: 1 / 2
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
Page 14 of 27  REVISION: /

### Page 15 (OCR)

S SAFRAN  AEROSYSTEMS
THIS PAGE INTENTIONALLY LEFT BLANK
DEVISION 02719  SERVICE BULLETIN  025-69-19
SBS PAGE: 2/2
.B. Nº412-157 EMERGENCY ALER
DATE: December 17, 201!
REVISION: /  Page 15 of 27

### Page 16 (OCR)

S SAFRAN  AEROSYSTEMS
FLOATS & RAFTS
58 rue de Segonzac - B.P. 81
16103 COGNAC CEDEX - FRANCE
Phone: (33) 5 45 83 20 20  SERVICE BULLETIN
Fax:  (33) 5 45 83 20 70
TITLE: EQUIPMENT/FURNISHINGS (ATA 25)
EMERGENCY FLOTATION SYSTEMS
INSPECTION OF FLOAT SUPPLY HOSES
1. PLANNING INFORMATION
A. Effectivity
(1)  Concerned equipment
This Service Bulletin applies to the in-service float supply hoses installed on Safran
Aerosystems (SAO) Emergency Flotation System (EFS) or spare listed in the tables that follow:
In-service components installing hoses belonging to the same batch number of the
affected hose (see paragraph 1.C)
NOTE: For Part Numbers with a float bag part number listed, the Serial Number
corresponds to the serial number of the float bag
AFFECTED
SAO EQUIPMENT  PART NUMBER  LHD EQUIPMENT  PART NUMBER  NUMBER  SERIAL  DESIGNATION  EQUIPMENT  SAO HOSES
PART NUMBER
SN 1610
SN 1612
SN 1614
210724-1  212-4600-26-104  SN 1616  R/H FLOAT EQUIPPED  210502-0
SN 1618
SN 1620
SN 1622
SN 1635
210725-1  212-4600-26-103  SN 1637  L/H FLOAT EQUIPPED  210502-0
SN 1639
SN 1641
215444-0  SN 99
(Float bag  412-4600-03-101  SN 100  L/H FLOTATION ASSEMBLY  215342-0
P/N 215271-0)  SN 110
SN 105
215445-0  SN 106
(Float bag  412-4600-03-102  SN 107  R/H FLOTATION ASSEMBLY  215342-0
P/N 215349-0)  SN 110
SN 119
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 1 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
Page 16 of 27  REVISION: /

### Page 17 (OCR)

S SAFRAN  AEROSYSTEMS
SAO EQUIPMENT LHD EQUIPMENT  PART NUMBER  PART NUMBER  NUMBER  SERIAL  DESIGNATION  EQUIPMENT  PART NUMBER  SAO HOSES  AFFECTED
SN 30
SN 32
220410-0  3G9560V02131  SN 33  SN 35  L/H FWD FLOAT ASSEMBLY  220415-0
SN 39
SN 50
SN 30
SN 33
220411-0  3G9560V02231  SN 36  SN 35  R/H FWD FLOAT ASSEMBLY  220415-0
SN 39
SN 42
220412-0  3G9560V02331  SN 28  L/H AFT FLOAT ASSEMBLY  220415-0
SN 29
SN 25
220413-0  3G9560V02431  R/H AFT FLOAT ASSEMBLY  220415-0
SN 36
AFT: Afterward  FW: Forward  L/H: Left Hand  R/H: Right Hand
SAO: Safran Aerosystems  LHD: Leonardo Helicopters Division
Table 1 - List of in service components installing hoses belonging to the same
batch number of the affected hose
(b)  Spare components affected belonging to the same batch number of the affected hose
(see paragraph 1.C)
NOTE: The manufacturing date and the batch number are found on the identification
label of the hose as shown for example in Figure 1.
SAO HOSES AFFECTED  PART NUMBER  MFG DATE  BATCH NUMBER
RC 312 43 55 001 (SAO batch)
215342-0  13441414 (supplier batch)
SAO: Safran Aerosystems  MFG: Manufacturing
Table 2 - List of spare components affected belonging to the same batch number
of the affected hose
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 2 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
REVISION: /  Page 17 of 27

### Page 18 (OCR)

• SAFRAN  AEROSYSTEMS
(c)  Floats installing hoses NOT belonging to the same batch number of the affected hose
(see paragraph 1.C)
NOTE: Equipment concerned are listed in Table that follows with reference to the last
Serial Number possibly affected.
NOTE: For Part Numbers with a float bag part number listed, the Serial Number
corresponds to the serial number of the float bag.
SAO  AFFECTED
EQUIPMENT  EQUIPMENT  LHD  EQUIPMENT  SERIAL  SAO HOSES  MFG
NUMBER  PART  PART NUMBER  DESIGNATION  NUMBER  NUMBER  PART  DATE
210724-1  212-4600-26-104  R/H FLOAT EQUIPPED  1750  210502-0  July 2019
210725-1  212-4600-26-103  L/H FLOAT EQUIPPED  1779  210502-0  July 2019
215444-0
(Float bag  412-4600-03-101  L/H FLOTATION ASSEMBLY  117  215342-0  July 2019
P/N 215271-0)
215445-0
(Float bag  412-4600-03-102  R/H FLOTATION ASSEMBLY  121  215342-0  July 2019
P/N 215349-0)
216345-0
(Float bag  205-4600-09-101  L/H FLOTATION ASSEMBLY  16  216339-0  July 2019
P/N 216228-0)
216346-0
(Float bag  205-4600-09-102  R/H FLOTATION ASSEMBLY  16  216339-0  July 2019
P/N 216229-0)
220410-0  3G9560V02131  L/H FWD FLOAT ASSEMBLY  202  220415-0  July 2019
220411-0  3G9560V02231  R/H FWD FLOAT ASSEMBLY  195  220415-0  July 2019
220412-0  3G9560V02331  L/H AFT FLOAT ASSEMBLY  185  220415-0  July 2019
220413-0  3G9560V02431  R/H AFT FLOAT ASSEMBLY  189  220415-0  July 2019
AFT: Afterward  FW: Forward  L/H: Left Hand  R/H: Right Hand
SAO: Safran Aerosystems  LHD: Leonardo Helicopters Division  MFG: Manufacturing
Table 3 - List of floats installing hoses NOT belonging to the same batch number of the affected hose
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 3 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
Page 18 of 27  REVISION: /

### Page 19 (OCR)

S SAFRAN  AEROSYSTEMS
Spare components affected NOT belonging to the same batch number of the affected
hose (see paragraph 1.C)
NOTE: The manufacturing date and the batch number are found on the identification
label of the hose as shown for example in Figure 1.
SAO HOSES AFFECTED PART  BATCH NUMBER
NUMBER  MFG DATE  (found on identification label of hose)
210502-0
215342-0
Manufactured until April 2015
216339-0
220415-0
SAO: Safran Aerosystems  MFG: Manufacturing
Table 4 - List of spare components affected NOT belonging to the same batch number
of the affected hose
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 4 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
REVISION: /  Page 19 of 27

### Page 20 (OCR)

S SAFRAN  AEROSYSTEMS
B. Concurrent Requirements
None.
C. Reason
This Service Bulletin is issued to supply the instructions for verifying the proper air flow through the
three float supply hoses of Emergency Flotation System (EFS) inflation system.
During maintenance operations on EFS, the third compartment of the left forward float did not inflate.
The supply hose ensuring the gas flow from the cylinder assembly to the related float compartment
was found blocked.
D. Description
To prevent any significant operational disruptions, a special inspection has to be performed to in-
service and spare supply hoses to verify that each component is fully operational and to ensure that
the equipment is in normal condition.
NOTE: Refer to Table 1 and Table 3 to identify the hoses of in-service equipment and Table 2 and
Table 4 for the spare components possibly affected.
E. Compliance
For in-service components compliance, refer to related Leonardo Helicopters Division (LHD)
Service Bulletin (SB).
NOTE: Inspection will be performed systematically during the first return at ZS for any EFS
manufactured before July 2019 and any hoses manufactured before April 2015.
Operator able to perform the EFS maintenance in accordance with Aircraft Maintenance Manual
(AMM) or Aircraft Maintenance Publication (AMP) can perform the procedure defined in this
Service Bulletin.
F. Approval
The technical information contained in this Equipment Manufacturer's Service Bulletin was
approved by LHD.
G. Manpower
(1)  1 technician
(2)  Estimated time: 10 minutes per hose (for Service Bulletin application only).
H. Weight and Balance
Not affected.
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 5 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
Page 20 of 27  REVISION: /

### Page 21 (OCR)

S SAFRAN  AEROSYSTEMS
I. Electrical Load Data
Not affected.
J. Software Accomplishment Summary
Not applicable.
K. References
(1) Component Maintenance Manuals
- CMM 25-69-29
- CMM 25-69-37
- CMM 25-69-56
- CMM 25-69-80
(2)  Aircraft Service Bulletin
- See applicable Leonardo Helicopters Division (LHD) Service Bulletin (SB).
(3) Aircraft Maintenance Manual (AMM) or Aircraft Maintenance Publication (AMP)
- Refer to LHD SB for the list of applicable AMM / AMP.
Publications Affected
(1)  Component Maintenance Manuals
- CMM 25-69-29
- CMM 25-69-37
- CMM 25-69-56
- CMM 25-69-80
M. Interchangeability
Not applicable.
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
REVISION: 00  PAGE: 6 / 12
S.B. N°412-157 EMERGENCY ALERT
DATE: December 17, 2019
REVISION: /  Page 21 of 27

### Page 22 (OCR)

S SAFRAN  AEROSYSTEMS
2. MATERIAL INFORMATION
A. Material - Price and Availability
(1) Material to be purchased
Refer to Table 5.
(2) Price
Replacement of hoses found defective after inspection (hose blocked) will be free of charge.
(3) Availability
Details available on request.
B.  Industry Support Information
For spare parts, please contact the related Zodiac Aerospace Services (ZS) logistic center available
on Safran Aerosystems web site:
www.safran-aerosystems.com/services
C.  List of Components
(1)  Material to be purchased
SAO HOSES PART NUMBER  DESIGNATION  QUANTITY
210502-0  Flexible supply hose  Upon request
215342-0  Float supply hose  Upon request
216339-0  Float supply hose  Upon request
220415-0  Float supply hose  Upon request
Table 5 - List of materials
(2)  Material supplied by the operator
Not applicable.
D.  Subcomponents To Be Re-identified
Not applicable.
E.  Tooling
- Plastic cable tie, 300 mm min. x 5 mm max. (11.811 in min. x .196 in max.) (commercially available),
- Heat shrinkable sleeve, green color (local supply).
F. Special Tools
None.
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
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S SAFRAN  AEROSYSTEMS
3.  ACCOMPLISHMENT INSTRUCTIONS
CAUTION: APPLY THIS INSPECTION SERVICE BULLETIN ON CLEAN SURFACE AND WITH CLEAN
HANDS.
A. General
(1)  Refer to Table that follows to identify the Component Maintenance Manual (CMM) related to
in-service equipment to be verified or refer to related Aircraft Maintenance Manual (AMM) or
Aircraft Maintenance Publication (AMP) for equivalent procedure (see Leonardo Helicopters
Division Service Bulletin).
SAO EQUIPMENT  PART NUMBER  LHD EQUIPMENT  PART NUMBER  DESIGNATION  EQUIPMENT  PART NUMBER  SAO HOSES  AFFECTED  CMM
210724-1  212-4600-26-104  R/H FLOAT EQUIPPED  210502-0  25-69-80
210725-1  212-4600-26-103  L/H FLOAT EQUIPPED  210502-0  25-69-80
215444-0  412-4600-03-101  L/H FLOTATION ASSEMBLY  215342-0  25-69-29
215445-0  412-4600-03-102  R/H FLOTATION ASSEMBLY  215342-0  25-69-29
216345-0  205-4600-09-101  L/H FLOTATION ASSEMBLY  216339-0  25-69-37
216346-0  205-4600-09-102  R/H FLOTATION ASSEMBLY  216339-0  25-69-37
220410-0  3G9560V02131  L/H FWD FLOAT ASSEMBLY  220415-0  25-69-56
220412-0  3G9560V02331  L/H AFT FLOAT ASSEMBLY  220415-0  25-69-56
220411-0  3G9560V02231  R/H FWD FLOAT ASSEMBLY  220415-0  25-69-56
220413-0  3G9560V02431  R/H AFT FLOAT ASSEMBLY  220415-0  25-69-56
Table 6 - List of Component Maintenance Manuals (CMMS) related to in-service equipment
B.  Preparation
Remove each supply hose from the float (applicable to in-service equipment)
NOTE:  Removal of the hoses can be done by following the instructions of the related
Component Maintenance Manual (CMM) (section "DISASSEMBLY") whose listing is
given hereafter, and additional procedure that follows.
- AB412 helicopter  : refer to CMM 25-69-29, section "DISASSEMBLY" page 301,
• AB205 helicopter  refer to CMM 25-69-37, section "DISASSEMBLY page 301
- AB205/212/412 helicopter : refer to CMM 25-69-80, section "DISASSEMBLY" page 301
- AW 139 helicopter  refer to CMM 25-69-56, section "DISASSEMBLY" page 301.
Remove and unfold the float equipped with the hoses to be inspected, refer to the related
instructions given in Aircraft Maintenance Manual (AMM).
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Loosen and remove the cylinder hose from the main supply coupling of the float.
(d) Loosen and remove each stop screw from the float supply couplings.
(e) Disconnect then remove the float supply hose to be inspected.
C. Procedure
(1) Examine the supply hose with a plastic cable tie (in-service equipment and spare component)
(a) Insert the end of plastic cable tie in the hole of banjo (refer to Figure 2):
- If the cable tie goes through the banjo freely up to a minimal length of 300 mm (11.811 in),
the hose is fully operative (refer to Figure 3),
If a blockage occurs in the duct of banjo, the hose is blocked internally and must be
replaced:
• Please contact Zodiac Aerospace Services (ZS) to get a replacement part.
• Inform Safran Aerosystems of any occurrence at the email address that follows:
tech-support.sao@safrangroup.com
Do again the operation for all end-pieces and banjos of the hose.
NOTE: For the double duct banjos, do the inspection for each duct through its related
hole.
(b)  At the end of the inspection, apply a piece of green heat-shrinkable sleeve to the flexible
part of the supply hose to show that the component is fully operative.
(c)  Record the application of the service bulletin by writing down SB 025-69-19 above the
external identification marking of EFS.
(d)  Accordingly complete the log-card of the equipment when the hose is installed on EFS
by writing the date and the reference of the Service Bulletin.
D.  Re-identification
Not applicable.
E. Test
Not applicable.
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
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F.  Close-up
(1)  Re-install each supply hose on the equipment (applicable to in-service equipment)
NOTE: Installation of the hoses has to be performed with the instructions of the related
Component Maintenance Manual (CMM) (section "ASSEMBLY") whose listing is given
- AB412 helicopter  : refer to CMM 25-69-29, section "ASSEMBLY" page 701,
- AB205 helicopter  : refer to CMM 25-69-37, section "ASSEMBLY" page 701,
- AB205/212/412 helicopter : refer to CMM 25-69-80, section "ASSEMBLY" page 701,
- AW 139 helicopter  : refer to CMM 25-69-56, section "ASSEMBLY" page 701.
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S SAFRAN  AEROSYSTEMS
Manufacturing date
Batch number
• 1000
Identification label of hose
Figure 1
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
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Banjo  Plastic cable tie
300 mm min. × 5 mm max.
(11.811 in min. × .196 in max.)
Figure 2
Figure 3
DATE: NOV 22/19  SERVICE BULLETIN  025-69-19
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### Page 28

Remarks:
Information: 
SERVICE BULLETIN COMPLIANCE   FORM Date:
Number:
Revision:
Please send to the following address: 
Telephone:
Fax:
 B.T. Compliance Date:
 Customer Name and Address:
 Helicopter Model S/N Total Number Total Hours T.S.O.
LEONARDO S.p.A.
CUSTOMER SUPPORT & SERVICES - ITALY
PRODUCT SUPPORT ENGINEERING & LICENSES DEPT. 
Via  Giovanni Agusta, 520
21017  Cascina  Costa di Samarate (VA) - ITALY 
Tel.: +39 0331 225036  Fax: +39 0331 225988
We request your cooperation in filling this form,  in order to keep out statistical data relevant to aircraft configuration up-to-date. The form should be filled in all
its parts and sent to the above address or you can communicate the application also via Technical Bulletin Application Communication Section placed in 
Leonardo AW Customer Portal - MyCommunications Area. We thank you beforehand for the information given.

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