Leonardo S.p.A.
Via Giovanni Agusta, 520
21017 Cascina Costa di Samarate (VA) Italy
Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595
SERVICE BULLETIN N° 139-468
DATE: May 15, 2017
REV. : / - March 3, 2017
TITLE
ATA 26 - LEFT AND RIGHT FIRE DETECTION SYSTEM
REVISION LOG
New Issue
An appropriate entry should be made in the aircraft log book upon accomplishment.
If ownership of aircraft has changed, please, forward to new owner.
Page 1 of 14
1. PLANNING INFORMATION
A. EFFECTIVITY
All AB139/AW139 helicopters from S/N 31005 to S/N 31157 (except S/N 31007), from
S/N 31201 to S/N 31398 and from S/N 41201 to S/N 41293 (except S/N 41237)
equipped with firewalls reinforcements P/N 3G7106P07351 and 3G7106P07451 or
P/N 3P7119A35152 and 3P7119A35252 (refer to figures 1 thru 3).
B. COMPLIANCE
Part I
Within one hundred (100) FH or one (1) month from receipt of this Service Bulletin,
whichever comes first, and then every twenty-five (25) FH until part II is applied.
Part II
• Immediately after accomplishment of part I, if damages on sensing element beyond
acceptable limits are found during the accomplishment of part I of this Service
Bulletin.
• Within one hundred (100) FH or one (1) month, whichever comes first, after first
accomplishment of part I, if either interference without damages between firewall
reinforcements and sensing element is detected or an acceptable damage on
sensing element is found during the accomplishment of part I of this Service Bulletin.
• Within fifteen hundred (1500) FH or at first engine removal, whichever comes first,
after first accomplishment of part I, if interference is not detected and damages on
sensing element are not found during the accomplishment of part I of this Service
Bulletin.
C. CONCURRENT REQUIREMENTS
N.A.
D. REASON
This Service Bulletin is issued to provide the necessary instructions to modify fire
detection sensing element installation, thus preventing possible interference with the
firewall reinforcements.
S.B. N°139-468
DATE: May 15, 2017
Page 2 of 14 REVISION: /
E. DESCRIPTION
Following some events of chafing between the engine fire detection system sensing
element and the reinforcements introduced by firewalls retro modification P/N
3G7106P06011 or repair drawing P/N 3G0203P00311, this Service Bulletin provides
the instructions to ensure the appropriate clearance between the parts.
In particular, part I of this Service Bulletin prescribes a visual inspection of the affected
area that has to be repeated every twenty-five FH, in case interference between
firewall reinforcements and sensing element is found, until accomplishment of part II.
Part II provides instructions to implement an improved design (fire detection LH and
RH retromod P/N 3G2610P00211), installing a new bracket between sensing element
and firewall reinforcement, in order to increase clearance and to prevent any possible
interference issue.
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.
E.A.S.A. 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 the following MMH are deemed necessary:
Part I: approximately one (1) MMH;
Part II: approximately ten (10) MMH.
MMH are based on hands-on time and can change with personnel and facilities
available
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 3 of 14
H. WEIGHT AND BALANCE
N.A.
I. REFERENCES
1) PUBLICATIONS
DATA MODULE DESCRIPTION PART
DM01 39-A-00-20-00-00A-120A-A Helicopter on ground for a safe I, II
maintenance
DM02 39-A-06-41-00-00A-010A-A Access doors and panels I, II
DM03 39-A-26-11-01-00A-520A-A (LH) Sensing element – Remove I
procedure
DM04 39-A-26-12-01-00A-520A-A (RH) Sensing element – Remove I
procedure
DM05 39-A-26-11-01-00A-720A-A (LH) Sensing element - Install I
procedure
DM06 39-A-26-12-01-00A-720A-A (RH) Sensing element - Install I
procedure
DM07 39-A-24-31-01-00A-520A-A Number 1 starter generator - II
Remove procedure
DM08 39-A-24-31-01-00A-720A-A Number 1 starter generator - II
Install procedure
DM09 39-A-24-31-02-00A-520A-A Number 2 starter generator-
Remove procedure
DM10 39-A-24-31-02-00A-720A-A Number 2 starter generator - II
Install procedure
DM11 39-A-GG-01-00-00A-066A-A Platform (GG-01-00) I, II
DM12 39-A-GG-02-00-00A-066A-A Platform (GG-02-00) I, II
Refer also to the engine maintenance manual for the procedures referenced in the
accomplishment instructions.
2) ACRONYMS
AMDI Aircraft Material Data Information
AMP Aircraft Maintenance Publication
ASRP Aircraft Structural Repair Publication
DM Data Module
FH Flight Hours
FMM Fuel Management Module
IPD Illustrated Parts Data
ITEP Illustrated Tools & Equipment Publication
S.B. N°139-468
DATE: May 15, 2017
Page 4 of 14 REVISION: /
MMH Maintenance Man-Hours
MMIR Maintenance Malfunction Information Report
3) ANNEX
N.A.
J. PUBLICATIONS AFFECTED
AW139 AMP
AW139 IPD
K. SOFTWARE ACCOMPLISHMENT SUMMARY
N.A.
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 5 of 14
2. MATERIAL INFORMATION
A. REQUIRED MATERIALS
1) PARTS
PART II
P/N DESCRIPTION Q.TY NOTE
3G2610P00211 FIRE DETECTION LH AND RH REF
RETROMOD
Composed of
3G2610A00551 LH sensing element bracket 1
3G2610A00651 RH sensing element bracket 1
NSA5592-01 Sensor bushing 2
7C31-1AA Clamp, loop 2 (1)
MS20615-4M3R Rivet 4 Local
supply
NAS9307M-4-01 Rivet 4 Local
supply
2) CONSUMABLES
Refer to AMDI for the consumable materials required to comply with the AMP DM
referenced in the accomplishment instructions.
B. SPECIAL TOOLS
P/N DESCRIPTION Q.TY NOTE PART
RMGE-DS-06-2010-LH Platform (GG-01-00) AR I, II
or
2004-5007-A
or equivalent
RMGE-SL-06-2010 Platform (GG-02-00) AR I, II
or
2004-5007-A
or equivalent
Commercial Depth gauge 1 (2) I
Refer also to ITEP for the special tools required to comply with the AMP DM
referenced in the accomplishment instructions.
NOTE
(1) P/N 30-024-1 may be supplied as a valid alternative.
(2) The Depth Gauge dial indicator must have a graduation of 0.01 mm.
S.B. N°139-468
DATE: May 15, 2017
Page 6 of 14 REVISION: /
C. INDUSTRY SUPPORT INFORMATION
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.
NOTE: INSPECTION REPORTS are mandatory; in case the MMIR is not
accompanied by these documents, it will be rejected.
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 7 of 14
3. ACCOMPLISHMENT INSTRUCTIONS
GENERAL NOTES
a) 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.
b) Exercise extreme care during drilling operations to
prevent instruments, cables and hoses damage.
c) After drilling, remove all swarf and sharp edges.
Apply on bare metal a light film of primer unless the
hole is used for ground connection.
d) Lenghts in the figures are in mm.
PART I
1. In accordance with DM 39-A-00-20-00-00A-120A-A, prepare the helicopter on ground for
a safe maintenance. Disconnect the battery, all electrical power sources and/or the
external power supply.
2. Prepare access to the inspection area on the left side as follows:
2.1 Put the Platform (GG-01-00), or an approved alternative, adjacent to the left side
of the fuselage.
2.2 Open the access door (461AL). Refer to AMP, see DM 39-A-06-41-00-00A-010A-
A.
3. Prepare access to the inspection area on the right side as follows:
3.1 Put the Platform (GG-02-00), or an approved alternative, adjacent to the right
side of the fuselage.
3.2 Open the access door (462AR). Refer to AMP, see DM 39-A-06-41-00-00A-
010A-A.
4. With reference to figure 1, perform a visual inspection of the fire detection system
sensing element for possible interference with the firewall reinforcements and damage.
4.1 In case of no findings or if a scratch is found on the sensing element with a depth
of 0.1 mm or lower, go to step 5.
4.2 If a scratch is found on the sensing element with a depth higher than 0.1 mm,
perform following steps:
4.2.1 Remove the damaged sensing element. Refer to AMP, see DM 39-A-
26-11-01-00A-520A-A and/or DM 39-A-26-12-01-00A-520A-A.
S.B. N°139-468
DATE: May 15, 2017
Page 8 of 14 REVISION: /
4.2.2 Perform immediately fire detection retromod P/N 3G2610P00211
according to part II of this Service Bulletin.
4.2.3 Install a new sensing element. Refer to AMP, see DM 39-A-26-11-01-
00A-720A-A and/or DM 39-A-26-12-01-00A-720A-A.
5. Close the access doors (461AL) and (462AR). Refer to AMP, see DM 39-A-06-41-00-
00A-010A-A.
6. Remove the platforms from both sides of the fuselage.
7. Return the helicopter to flight configuration and record for compliance with part I of this
Service Bulletin on the helicopter logbook.
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 9 of 14
PART II
1. In accordance with DM 39-A-00-20-00-00A-120A-A, prepare the helicopter on ground for
a safe maintenance. Disconnect the battery, all electrical power sources and/or the
external power supply.
2. Prepare access to the work area on the left side as follows:
2.1 Put the Platform (GG-01-00), or an approved alternative, adjacent to the left side
of the fuselage.
2.2 Open the access door (461AL). Refer to AMP, see DM 39-A-06-41-00-00A-010A-
A.
3. With reference to figure 2, perform fire detection retromod P/N 3G2610P00211 on the
LH side as follows:
3.1 Remove the Number 1 starter generator according to AMP DM 39-A-24-31-01-
00A-520A-A.
3.2 Remove the FMM according to the engine maintenance manual (see chapter
73.20.03, paragraph 5.A).
3.3 Install clamp P/N 7C31-1AA on new sensing element bracket P/N
3G2610A00551 using two rivets P/N MS20615-4M3R.
CAUTION
Make sure that there is clearance between the firewall
reinforcement and the sensing element new routing
when positioning the bracket, according to figure 2
section C-C.
NOTE
It is allowed to temporarily disconnect the sensing
element from clamps near the firewall reinforcement, if
required to have an easier access to the work area.
3.4 Install the sensing element bracket P/N 3G2610A00551 on the firewall
reinforcement using two rivets P/N NAS9307M-4-01.
3.5 Fix the sensing element with sensor bushing P/N NSA5592-01 on the clamp in
the new position.
3.6 Install the FMM according to the engine maintenance manual (see chapter
73.20.03, paragraph 5.B).
3.7 Install the Number 1 starter generator according to AMP DM 39-A-24-31-01-00A-
720A-A.
4. Prepare access to the work area on the right side as follows:
4.1 Put the Platform (GG-02-00), or an approved alternative, adjacent to the right
S.B. N°139-468
DATE: May 15, 2017
Page 10 of 14 REVISION: /
side of the fuselage.
4.2 Open the access door (462AR). Refer to AMP, see DM 39-A-06-41-00-00A-
010A-A.
5. With reference to figure 3, perform fire detection retromod P/N 3G2610P00211 on the
RH side as follows:
5.1 Remove the Number 2 starter generator according to AMP DM 39-A-24-31-02-
00A-520A-A.
5.2 Install clamp P/N 7C31-1AA on new sensing element bracket P/N
3G2610A00651 using two rivets P/N MS20615-4M3R.
CAUTION
Make sure that there is clearance between the firewall
reinforcement and the sensing element new routing
when positioning the bracket, according to figure 3
section D-D.
NOTE
It is allowed to temporarily disconnect the sensing
element from clamps near the firewall reinforcement, if
required to have an easier access to the work area.
5.3 Install the sensing element bracket P/N 3G2610A00651 on the firewall
reinforcement using two rivets P/N NAS9307M-4-01.
5.4 Fix the sensing element with sensor bushing P/N NSA5592-01 on the clamp in
the new position.
5.5 Install the Number 2 starter generator according to AMP DM 39-A-24-31-02-00A-
720A-A.
6. Close access doors (461AL) and (462AR). Refer to AMP, see DM 39-A-06-41-00-00A-
010A-A.
7. Remove the platforms from both sides of the fuselage.
8. Return the helicopter to flight configuration and record for compliance with part II of this
Service Bulletin on the helicopter logbook.
9. Send the attached compliance form to the following mail box:
cse.aw139.aw@leonardocompany.com
As an alternative, gain access to My Communications section on Leonardo WebPortal
and compile the “Service Bulletin Application Communication”.
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 11 of 14
B 3G2610P00211
FIRE DETECTION
LH AND RH RETROMOD
LH
D
FW
SPACE VIEW
3G7106P07351 OR 3P7119A35152
REINFORCEMENT LH (SHOWN) (REF.)
3G7106P07451 OR 3P7119A35252
REINFORCEMENT RH (OPPOSITE) (REF.)
WAS
EXISTING NSA5592-01
EXISTING NSA5592-01 SENSOR BUSHING (REF)
SENSOR BUSHING (REF) EXISTING 7C31-1AA
EXISTING 7C31-1AA CLAMP LOOP (REF)
CLAMP LOOP (REF)
FIRE DETECTOR SENSOR
OLD ROUTING
VIEW A (TYP OPP SIDE)
ENGINE, STRUCTURES AND SYSTEMS ARE PARTIALLY OMITTED FOR BETTER CLARITY PURPOSE
Figure 1
S.B. N°139-468
DATE: May 15, 2017
Page 12 of 14 REVISION: /
3G2610P00211
BECOMES FIRE DETECTION
INSTALL:
3G2610A00551 SENSING
LH AND RH RETROMOD
15.00
ELEMENT BRACKET
EXISTING NSA5592-01
INSTALL: SENSOR BUSHING
INSTALL: EXISTING 7C31-1AA
NSA5592-01 SENSOR BUSHING 02 N
CLAMP LOOP
7C31-1AA CLAMP LOOP
INSTALL:
01 N
INSTALL:
01 N
EXISTING NSA5592-01
SENSOR BUSHING
EXISTING 7C31-1AA INSTALL:
CLAMP LOOP 02 N
C C
249.4
FIRE DETECTOR SENSOR
NEW ROUTING
WL
2671 VIEW A
ENGINE, STRUCTURES AND SYSTEMS
ARE PARTIALLY OMITTED FOR BETTER CLARITY PURPOSE
FIRE DETECTOR SENSOR
NEW ROUTING
3G7106P07351 OR 3P7119A35152
REINFORCEMENT LH (REF.)
3.5 RAN
CL
EA
SECTION C-C
CE
RIVET CODE
N: Head is on Near side
REF. NUMBER F: Head is on Far side REF. N. RIVET P/N
:COUNTERSINK 01 MS20615-4M3R
(100˚ only) is on 02 NAS9307M-4-01
Near side
:COUNTERSINK
(100˚ only) is on
Far side
Figure 2
S.B. N°139-468
DATE: May 15, 2017
REVISION: / Page 13 of 14
3G2610P00211
INSTALL:
BECOMES FIRE DETECTION
01 N
LH AND RH RETROMOD
15.00
INSTALL:
EXISTING NSA5592-01 3G2610A00651 SENSING
SENSOR BUSHING INSTALL:
ELEMENT BRACKET
EXISTING 7C31-1AA 02 N
CLAMP LOOP
INSTALL:
NSA5592-01 SENSOR BUSHING
7C31-1AA CLAMP LOOP
INSTALL:
01 N
EXISTING NSA5592-01
SENSOR BUSHING
EXISTING 7C31-1AA
CLAMP LOOP
D D
INSTALL:
02 N
249.4
FIRE DETECTOR SENSOR
NEW ROUTING
VIEW B WL
2671
ENGINE, STRUCTURES AND SYSTEMS
ARE PARTIALLY OMITTED FOR BETTER CLARITY PURPOSE
FIRE DETECTOR SENSOR
NEW ROUTING
3G7106P07451 OR 3P7119A35252
E
NC
REINFORCEMENT RH (REF.)
EA 3.5
RA
CL
SECTION D-D
RIVET CODE
N: Head is on Near side
REF. NUMBER F: Head is on Far side REF. N. RIVET P/N
:COUNTERSINK 01 MS20615-4M3R
(100˚ only) is on 02 NAS9307M-4-01
Near side
:COUNTERSINK
(100˚ only) is on
Far side
Figure 3
S.B. N°139-468
DATE: May 15, 2017
Page 14 of 14 REVISION: /
Please send to the following address:
SERVICE BULLETIN COMPLIANCE FORM Date:
LEONARDO S.p.A.
CUSTOMER SUPPORT & SERVICES - ITALY Number:
PRODUCT SUPPORT ENGINEERING & LICENSES DEPT.
Via Giovanni Agusta, 520
21017 Cascina Costa di Samarate (VA) - ITALY Revision:
Tel.: +39 0331 225036 Fax: +39 0331 225988
Customer Name and Address: Telephone:
Fax:
B.T. Compliance Date:
Helicopter Model S/N Total Number Total Hours T.S.O.
Remarks:
Information:
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.
