ASB No. EC155-05A027

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 Civil version: B, B1 

 

ALERT SERVICE BULLETIN

SUBJECT: TIME LIMITS - MAINTENANCE CHECKS - External life rafts installed in the 

footsteps 

 Check of the deployment system of the external life rafts located in the 

footsteps 

 ATA 25 

Revision No. Date of issue 

Revision 0 2014-06-12 

Revision 1 2014-09-01 

Summary: 

Check for corrosion and measurement of the operational clearance in the junction units of the external life raft 

installation in the footstep. 

Reason for last Revision: 

Revision 1 of this ALERT SERVICE BULLETIN consists in adding: 

- modifications to the junction unit illustrations. 

- details concerning compliance with AMM Task 25-69-01-721. 

Compliance: 

Airbus Helicopters renders compliance with this ALERT SERVICE BULLETIN mandatory, except for 

paragraph 3.D.

For the attention of 
 ASB No. EC155-05A027

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Corrosion 

1. PLANNING INFORMATION 

1.A. EFFECTIVITY 

1.A.1. Helicopters/installed equipment 

Helicopters equipped with external life rafts in the footsteps, with junction units 

with Part Number (MP/N) 200188 (P/N 704A341302.30). 

1.A.2. Non-installed equipment 

On junction units with Part Number (MP/N) 200188 (P/N 704A341302.30). 

1.B. ASSOCIATED REQUIREMENTS 

Not applicable. 

1.C. REASON 

On an AS365 helicopter, during the maintenance operation scheduled at 600 flying hours or 24 months on 

the external life rafts located in the footstep, the life raft deployment test carried out by the operator by pulling 

the LH internal deployment handle did not function correctly. 

Investigations revealed the presence of corrosion inside the LH junction unit MP/N 200197. The deployment 

handle was blocked due to this corrosion. 

Some EC155 version B and B1 helicopters are equipped with similar junction units with Part Number 

(MP/N) 200188. 

Consequently, pending a definitive solution and in order to prevent any risk of blockage in the external life 

raft deployment control system, Airbus Helicopters makes compliance with the instructions of this ALERT 

SERVICE BULLETIN mandatory, except for paragraph 3.D. 

Revision 1 does not affect compliance with Revision 0 of this ALERT SERVICE BULLETIN. 
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1.D. DESCRIPTION 

Compliance with this ALERT SERVICE BULLETIN Revision 0 consisted in: 

- Checking that the drainage hole blank, located on the RH and LH junction units of the external life raft 

installation, is correctly positioned. 

- Measuring the operational clearance between the junction unit pulleys and cover. 

- Checking that there is no corrosion inside the junction units. 

- If necessary, removing the corrosion from the cover surface and/or pulleys of the junction unit(s). 

This ALERT SERVICE BULLETIN Revision 1 consists in: 

- Adding modifications to the illustrations of the junction unit, in order to comply with its dimensions and 

geometry. 

- Specifying the acceptable tensile loads during compliance with AMM Task 25-69-01-721, by adding 

paragraph 4.B. and modifying the flow chart in paragraph 1.E.2. 

- Modifying part of the wording in paragraph 1.E.2. 

- Limiting compliance with this ALERT SERVICE BULLETIN required in the flow chart to paragraphs 3.A. and 

3.B. 

1.E. COMPLIANCE 

1.E.1. Compliance at the works 

Helicopters/installed equipment: 

Not applicable. 

Non-installed equipment: 

Before delivery, comply with paragraph 3.B.6. on the junction units specified in paragraph 1.A.2. 
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1.E.2. Compliance in service 

The work on the helicopter is to be performed by the operator. 

Helicopters/installed equipment: 

- Comply with this ALERT SERVICE BULLETIN within the time limits defined in the flowchart below: 

NO 

Time limits for compliance 

with this ALERT SERVICE 

BULLETIN

Comply with AMM Task 25-69-01-721 before the next mission for which life rafts are needed following receipt 

of this ALERT SERVICE BULLETIN Revision 1, issued on the date indicated at the bottom of the page. 

YES 

Comply with paragraphs 3.A. and 3.B. of

this ALERT SERVICE BULLETIN within 

110 flying hours following compliance 

with AMM Task 25-69-01-721.

Comply with paragraphs 3.A. and 3.B.

of this ALERT SERVICE BULLETIN 

no later than within 15 days following 

compliance with AMM Task 

25-69-01-721. 

Comply with paragraphs 3.A. and 

3.B. of this ALERT SERVICE 

BULLETIN before the next 

mission for which life rafts are 

needed. 

Fill in and return the list of the checked junction units (list given in the Appendix) within 

1 month following compliance with paragraphs 3.A. and 3.B. of this ALERT SERVICE 

BULLETIN Revision 1. 

- If corrosion is found, send the list of checked junction units along with photos of 

the corroded unit (before rework of the unit). 

. Contact the Airbus Helicopters Technical Support Department: 

Fax: + 33 (0)4.42.85.99.66. 

E-mail: Support.Technical-Optionnal@airbus.com

END 

NO 

YES

Are the tensile loads compliant 

with AMM Task 25-69-01-721 

and paragraph 4.B. of this ASB? 

Did the snap wire break? 

Apply a maximum load of 29 DaN 

(65.195 lbf) to one of the two handles 

during compliance with AMM 

Task 25-69-01-721.
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- For helicopters, regardless of whether or not they carry out missions for which life rafts are needed: 

. In order to ensure that the operational clearance is checked and measured within a controlled calendar 

time limit, Airbus Helicopters makes compliance with paragraph 3. of this ALERT SERVICE BULLETIN 

mandatory, no later than within 3 months following receipt of this ALERT SERVICE BULLETIN, issued on 

the date indicated at the bottom of the page. 

 Non-installed equipment: 

At the latest before installation on the helicopter, comply with paragraph 3.B.6. on the junction units specified 

in paragraph 1.A.2. 

1.F. APPROVAL 

 Approval of modifications: 

Not applicable. 

 Approval of this document: 

The technical information contained in this ALERT SERVICE BULLETIN Revision 0 was approved 

on June 11, 2014 under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of 

civil versions subject to an Airworthiness Certificate. 

The technical information contained in this ALERT SERVICE BULLETIN Revision 1 was approved 

on September 01, 2014 under the authority of EASA Design Organization Approval No. 21J.056 for 

helicopters of civil versions subject to an Airworthiness Certificate. 

1.G. MANPOWER 

For compliance with this ALERT SERVICE BULLETIN, Airbus Helicopters recommends the following 

personnel qualifications: 

Qualification: 1 Mechanical Engineering Technician 

The time for the operations is given for information purposes, for a standard configuration. 

Time for the operations: 6 hours for 1 Mechanical Engineering Technician 

1.H. WEIGHT AND BALANCE 

Not applicable. 
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1.I. EFFECT ON ELECTRICAL LOADS 

Not applicable. 

1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD 

Not applicable. 

1.K. REFERENCES 

The documents required for compliance with this ALERT SERVICE BULLETIN are as follows: 

MTC: 20.02.01.418: General - Protection of electrical wiring during maintenance operations 

MTC: 20.04.03.401: Corrosion inhibiting and removal procedures - General method for reconditioning 

corroded metal surfaces 

MTC: 20.04.04.403: Surface treatment before painting - Touch-up of protective treatment with Alodine 1200 

MTC: 20.04.05.434: Paint and primer application procedure - Application of metal primer scheme P50 

AMM: 25-69-01-063: External life raft installation - Removal/installation of life rafts 

AMM: 25-69-01-061: Life raft - Removal/installation of the life raft deployment controls 

AMM: 25-69-01-721: Life raft - Functional test of the life raft deployment control system 

1.L. DOCUMENTS AFFECTED 

Airbus Helicopters will modify the Aircraft Maintenance Manual (AMM) with respect to this ALERT SERVICE 

BULLETIN. 

The affected document will be updated as part of a future revision. 

1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS 

Not applicable.
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2. MATERIAL INFORMATION 

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT 

Price 

For any information concerning the kits and/or components, contact the Airbus Helicopters Network Sales 

and Customer Relations Department.

Availability 

The kits and/or components will be delivered on customer's order. 

Procurement conditions 

Order the required quantity (unless otherwise specified) 

from 

Airbus Helicopters 

Etablissement de Marignane 

Direction Ventes et Relations Client (ECR) 

13725 MARIGNANE CEDEX 

France 

NOTE 1 

On the purchase order, please specify the mode of 

transport, the destination and the serial numbers of the 

helicopters to be modified. 

NOTE 2 

For ALERT SERVICE BULLETINS, order by: 

Telex: HELICOP 410 969F 

Fax: +33 (0)4.42.85.99.96

2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT 

Not applicable. 

2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT 

Components to be ordered for one helicopter or one assembly: 

Designation Qty New P/N Item Former 

 P/N → Instruction 

Junction unit 1 or 2 200188 1 / To be returned as 

per paragraph 2.D. 
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 Products to be ordered separately: 

Refer to the Work Cards and Tasks specified in this ALERT SERVICE BULLETIN and the list below: 

Designation Qty Product P/N CM Item

Protective product 

DINOL AV 30 A/R - CM 508 yy

The products can be ordered separately from the INTERTURBINE AVIATION LOGISTICS company. 

Website: http://www.interturbine.com

 Telephone: +49.41.91.809.300 

AOG: +49.41.91.809.444 

Specific tooling: 

Designation Qty Tool P/N or equivalent Item 

Internal micrometer, 

diameter 60 to 80mm 1 Off the shelf zz 

2.D. MATERIAL TO BE RETURNED 

Return the non-compliant junction unit(s) to the following address: 

Airbus Helicopters 

Département EBSEEE 

Bâtiment R6 Marseilleveyre 

13725 MARIGNANE CEDEX - FRANCE 
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3. ACCOMPLISHMENT INSTRUCTIONS 

3.A. GENERAL 

Read and comply with the protection rules for electrical wiring during maintenance operations as per MTC 

Work Card 20.02.01.418. 

3.B. OPERATIONAL PROCEDURE 

The operational clearance measurements and the check for corrosion are only described for the LH junction 

unit. Carry out the operational clearance measurements and the check for corrosion in the RH junction unit 

by complying with the same operational procedure. 

3.B.1. Preliminary steps 

 

HANDLE THE CONTAINER WITH CARE, TO 

PREVENT ACTIVATING THE CYLINDER 

PERCUSSION AND TO PREVENT INJURY TO 

PERSONNEL.

 

BEFORE ANY WORK, RIG THE FLIGHT 

CONTROLS IN ORDER TO PREVENT INJURY TO 

PERSONNEL AND MAKE SURE THAT THE 

LOCKING PIP PIN FITTED WITH ITS PENNANT IS 

PRESENT ON THE CYLINDER PERCUSSION 

SYSTEM, IN ORDER TO PREVENT ACCIDENTAL 

PERCUSSION.

- Remove and/or open all cowlings, panels, doors and equipment as required for access to the various work 

zones. 

- Disconnect the cylinder percussion system connection kit as per AMM Task 25-69-01-063. 

 

WARNING

WARNING
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3.B.2. Check and measurement of the operational clearance of the junction unit 

3.B.2.a. Check of the junction unit cover (Figures 1 and 2) 

 

- Remove the screws (b) from the junction unit (f) (Figure 1). 

- Remove the cover (a). 

- Disconnect the deployment cables (c) and percussion cable (d) from the pulleys (e) located in the junction 

unit (f) (Figure 1) as per AMM Task 25-69-01-061. 

- Remove the junction unit (f) as per AMM Task 25-69-01-061. 

- Make sure that the drainage hole located on the upper face of the junction unit cover (a) is blanked with a 

cap (g) (Figure 2). 

- Make sure that the drainage hole located on the lower face of the junction unit cover (a) is not blanked 

(Figure 2). 

NOTE 

The blanking of the drainage holes depends on the position 

of the junction unit on the helicopter (refer to Figure 2). 

- Comply with paragraph 3.B.2.b. 

 

3.B.2.b. Check of the condition of the junction unit cover and measurement of the operational clearance 

 (Figures 3 and 4) 

- Make sure that there is no corrosion inside the cover (a) (Area A, Figure 3). 

. If there is no corrosion: 

- Measure and record the diameter (D1) of the cover using an internal micrometer (zz) (Figure 4). 

- Comply with paragraph 3.B.2.c. 

. If there is corrosion: 

- Carry out and record measurements of the diameter of the cover using an internal micrometer (zz) 

(Figure 4): 

. Carry out an initial measurement (D1) on a non-corroded surface of the cover. 

- If the measurement (D1) cannot be carried out (due to corrosion over the entire circumference 

of the cover), comply with paragraph 3.B.3. 

. Carry out a measurement (D2) on each corroded surface point of the cover. 

- Comply with paragraph 3.B.2.c. 
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3.B.2.c. Check of the condition of the junction unit pulleys and measurement of the operational clearance 

(Figures 1 and 3) 

- Make sure that there is no corrosion on the junction unit pulleys (Area B, Figure 3). 

. If there is no corrosion: 

- Measure and record the diameter (d1) (not shown) of the pulleys using a caliper gage. 

- Interpret the results as per paragraph 3.B.2.d. 

. If there is corrosion: 

- Carry out and record measurements of the diameter of the pulleys using a caliper gage: 

. Carry out an initial measurement (d1) (not shown) on a non-corroded surface 

of the pulleys. 

- If the measurement (d1) cannot be carried out (due to corrosion over the entire circumference 

of the pulleys), comply with paragraph 3.B.3. 

. Carry out a measurement (d2) (not shown) on each corroded surface point of the pulleys. 

- Interpret the results as per paragraph 3.B.2.d. 

3.B.2.d. Interpretation of the results 

- Calculate the initial clearance (J) between the internal/external pulley and the cover of the junction unit: 

. Initial clearance J = 

. If (J) is greater than (Jmax) (see Figure 4), comply with paragraph 3.B.3. 

. If (J) is smaller than or equal to (Jmax) (see Figure 4): 

- If there are no corrosion marks on the junction unit cover and pulleys, comply with paragraph 3.B.4. 

- If there is a corrosion mark on the junction unit cover: 

. Calculate the depth of the rework (P1) to be carried out on the junction unit cover, for each 

corrosion point: 

- Depth of the rework P1 = D2 - D1 

. If P1 is lower than 0, mechanically remove the corrosion from the surface as per MTC Work 

Card 20.04.03.401 until P1 is higher than or equal to 0 on each reworked surface point. 

. If P1 is higher than or equal to 0, record the P1 value for each reworked surface point. 

D1 - d1 

2 
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- If there is a corrosion mark on the junction unit pulley(s): 

. Calculate the depth of the rework (P2) to be carried out on the junction unit pulley(s), for each 

corrosion point: 

- Depth of the rework P2 = d1 - d2 

. If P2 is less than 0, mechanically remove the corrosion from the surface as per MTC Work 

Card 20.04.03.401 until P2 is higher than or equal to 0 on each reworked surface point. 

. If P2 is greater than or equal to 0, record the P2 value for each reworked surface point. 

- Calculate the total clearance between the internal/external pulleys and the cover of the junction unit 

for each reworked surface point: 

. Total clearance = J + P1 +P2. 

. If at least one of the two calculated total clearance values is greater than (Jmax) (see Figure 4), comply 

with paragraph 3.B.3. 

. If all calculated total clearance values are less than or equal to (Jmax) (see Figure 4), comply with 

paragraph 3.B.4. on the junction unit (f). 

3.B.3. Replacement of the junction unit 

- Return the junction unit (f) as per paragraph 2.D. 

- Order a new junction unit (1) as per paragraph 2.A. 

- Comply with paragraph 3.B.4. on the new junction unit (1). 

3.B.4. Protection and installation of the junction unit (Figures 1 and 3) 

- If the junction unit has been reworked as per 3.B.2.: 

. Apply Alodine 1200 to each reworked surface point as per MTC Work Card 20.04.04.403. 

- Apply metal primer scheme P50 to Areas A and B of the junction unit (Figure 3) as per MTC Work 

Card 20.04.05.434. 

- Apply Dinol AV 30 to Areas A and B of the junction unit (Figure 3) using a brush. 

CAUTION 

POSITION THE JUNCTION UNIT WITH THE 

DOUBLE CONNECTION POINTING TOWARD 

THE FRONT OF THE HELICOPTER. 

- Install the junction unit as per AMM Task 25-69-01-061. 

- Connect the deployment cables (c) and percussion cable (d) to the pulleys (e) located in the junction unit as 

per AMM Task 25-69-01-061. 

- Carry out a functional test of the life raft control system as per AMM Task 25-69-01-721.

- Install the cover (a) using the screws (b) of the junction unit, 

then, 

- tighten to torque as per Figure 1. 

- Comply with paragraph 3.B.5. 
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3.B.5. Final steps 

CAUTION 

REMOVE THE PIP PIN FROM THE PERCUSSION 

SYSTEM CYLINDER AND THE RIGGING PINS 

FROM THE FLIGHT CONTROLS.

- Connect the cylinder percussion system connection kit as per AMM Task 25-69-01-063. 

- Install and/or close all cowlings, panels, doors and equipment removed and/or opened during the 

preliminary steps (paragraph 3.B.1.). 

3.B.6. Operational procedure on non-installed equipment 

3.B.6.a. Measurement of the operational clearance between the junction unit cover and pulleys (Figures 1 and 4) 

- Remove the screws (b) from the junction unit (f) (Figure 1). 

- Remove the cover (a). 

- Measure and record the diameter (D1) of the cover using an internal micrometer (zz) (Figure 4). 

- Measure and record the diameter (d1) (not shown) of the pulleys using a caliper gage. 

- Calculate the initial clearance (J) between the internal/external pulley and the cover of the junction unit: 

. Initial clearance J = 

- If (J) is greater than (Jmax) (see Figure 4): 

. Transmit the Serial Number (S/N) of the checked junction unit to Airbus Helicopters: 

Contact the Airbus Helicopters Technical Support Department: 

Fax: +33 (0)4.42.85.99.66. 

E-mail: Support.Technical-Optionnal@eurocopter.com

. Return the junction unit (f) as per paragraph 2.D. 

- If (J) is less than or equal to (Jmax) (see Figure 4), comply with paragraph 3.B.6.b. 

3.B.6.b. Protection of the junction unit (Figure 3) 

- Apply Alodine 1200 to each reworked surface point as per MTC Work Card 20.04.04.403. 

- Apply metal primer scheme P50 to Areas A and B of the junction unit (Figure 3) 

as per MTC Work Card 20.04.05.434. 

- Apply Dinol AV 30 (yy) to Areas A and B of the junction unit (Figure 3) using a brush. 

- Install the cover (a) using the screws (b) of the junction unit, 

then, 

- tighten to torque as per Figure 1. 

- The junction unit can be installed. 

D1 - d1 

2 
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3.C. IDENTIFICATION 

 Identification of this document: 

Record first compliance with this ALERT SERVICE BULLETIN, with the revision number, in the helicopter 

documents. 

3.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

 Operating instructions: 

Not applicable. 

 Maintenance instructions: 

- Pending a definitive solution, comply with paragraphs 3.A. and 3.B. every 600 flying hours or 1 year 

following first compliance with the instructions given in this ALERT SERVICE BULLETIN. 

Then, 

- fill in and return the list of checked junction units (list given in the Appendix) within 1 month following latest 

compliance with this ALERT SERVICE BULLETIN. 

- If corrosion is found, send the list of checked junction units along with photos of the corroded unit (before 

rework of the unit). 

 . Contact the Airbus Helicopters Technical Support Department: 

Fax: +33 (0)4.42.85.99.66. 

E-mail: Support.Technical-Optionnal@airbus.com

The Aircraft Maintenance Manual (AMM) will incorporate these instructions as part of a future revision. 

Refer to the AMM once these instructions are integrated. 
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b 

e

a

f

1

Figure 1: Removal/installation of the junction unit 

c 

d 

5 

44.25 
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g 

h 

g 

j 

a 

a 

Junction unit cover located on the LH side of the helicopter, with blank (g) on 

the upper drainage hole (h). 

Junction unit cover located on the RH side of the helicopter, with blank (g) on 

the upper drainage hole (j). 

Figure 2: Drainage holes on the junction unit cover 
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Area A

D = 61±0.2 mm (2.40± .0079 in)

d = 60 mm (2.36 in) 

+0 

-0.25 

+0 

- .0098 

Area B

 

Check of the junction unit cover

 

Check of the junction unit pulleys 

Figure 3: Check for corrosion 
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Jmax = 0,75 mm (.029 in)

Jmax = 0,75 mm (.029 in)

Figure 4: Measurement of the clearance on the junction unit 

Second measurement D2

Initial measurement D1 

Corroded surface 

(cylindrical surface) 

Non-corroded surface 

(cylindrical surface) 
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4. APPENDIX 

4.A. LIST OF CHECKED JUNCTION UNITS 

Helicopter Serial 

Number (S/N) 

Number of flying 

hours logged by 

the helicopter 

Check of 

junction unit 

number 

Presence of 

corrosion in the 

junction unit* 

Flight for 

which life 

rafts are 

needed* 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

YES / NO YES / NO 

* Cross out as appropriate 

4.B. ACCEPTABLE TENSILE LOADS 

During compliance with AMM Task 25-69-01-721 on a junction unit MP/N 200188, a tensile load of 

between 15 DaN (33.721 lbf) and 20 DaN (44.961 lbf) is acceptable.