EMERGENCY

ALERT SERVICE BULLETIN

MBB BK117 C-2

MBB BK117 C-2-85A-024

PAGE 1 of 5

2009-04-16

REVISION 1, 2010-06-23

Optional Equipment – External Mounted Hoist System – Check of

boom support for cracks

1. Planning Information

A. Effectivity

(1) Helicopters affected: All MBB BK117 C-2 with external mounted hoist system.

(2) Components affected: Boom support 44307-500*

*) For S/N of the affected boom supports see Service Bulletin 44307-500-03, 

Rev. 2 of the Goodrich company.

(3) Spare Parts affected: Boom support 44307-500*

*) For S/N of the affected boom supports see Service Bulletin 44307-500-03, 

Rev. 2 of the Goodrich company.

B. Concurrent Requirements

Not applicable.

C. Reason

During pre-flight check of the external mounted hoist, cracks were detected on the boom

support. Therefore this Emergency Alert Service Bulletin prescribes a visual check of the

boom support.

With Revison 1 of this Emergency Alert Service Bulletin ECD distributes Service Bulletin

44307-500-03, Rev. 2 of the Goodrich company. This Service Bulletin specifies an

inspection. If no cracks are detected the boom support can be operated without limitations

after the accomplishment i.a.w. the Goodrich Service Bulletin 44307-500-03, Rev. 2.

D. Description

EFFECTIVITY Before accomplishment of Service Bulletin 44307-500-03, Rev. 2 of the

Goodrich company.

(1) Check boom support for cracks.

EFFECTIVITY With Revision 1 of this Emergency Alert Service Bulletin the Service

Bulletin 44307-500-03, Rev. 2 of the Goodrich company is distributed.

(2) See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company attached to this

Emergency Alert Service Bulletin.

This document is available on the internet: www.eurocopter.com/techpub
EMERGENCY

ALERT SERVICE BULLETIN

MBB BK117 C-2

MBB BK117 C-2-85A-024

PAGE 2 of 5 REVISION 1, 2010-06-23

2009-04-16

E. Compliance

EFFECTIVITY Before accomplishment of Service Bulletin 44307-500-03, Rev. 2 of the

Goodrich company.

(1) The check of the boom support i.a.w. Section 3.A of this Emergency Alert Service

Bulletin must be accomplished before every first flight of the day.

(2) Boom supports in store must be checked i.a.w. Section 3.A of this Emergency Alert

Service Bulletin before installation at the latest.

(3) If cracks on the boom support are detected during the visual check, the boom support

must be removed or replaced before the next flight.

EFFECTIVITY With Revision 1 of this Emergency Alert Service Bulletin an inspection

i.a.w. Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company is

specified.

(4) The inspection of the boom support i.a.w. Service Bulletin 44307-500-03, Rev. 2 of the

Goodrich company must be accomplished within 30 days after receipt of Revision 1 of

this Emergency Alert Service Bulletin.

After that, all measures of this Emergency Alert Service Bulletin are no longer

applicable.

F. Approval

The technical content of this document is approved under the authority of

DOA No. EASA.21J.034

G. Manpower

EFFECTIVITY Before Revision 1 of this Emergency Alert Service Bulletin.

(1) Approx. 15 minutes for the visual check of the boom support.

EFFECTIVITY With Revison 1 of this Emergency Alert Service Bulletin.

(2) See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

H. Weight and Balance

Not applicable.

I. Electrical Load Data

Not applicable.

J. Software Accomplishment Summary

Not applicable.
EMERGENCY

ALERT SERVICE BULLETIN

MBB BK117 C-2

MBB BK117 C-2-85A-024

PAGE 3 of 5

2009-04-16

REVISION 1, 2010-06-23

K. References

See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

L. Other Publications affected

Not applicable.

M. Interchangeability of Parts

Not applicable.

2. Material Information

A. Material – Price and Availability

See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

B. Support Information

Not applicable.

C. Material Necessary for Each Helicopter

See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

D. Material Necessary for Each Spare

See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

E. Reidentified Parts

See Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

F. Special Tooling

Not applicable.
EMERGENCY

ALERT SERVICE BULLETIN

MBB BK117 C-2

MBB BK117 C-2-85A-024

PAGE 4 of 5 REVISION 1, 2010-06-23

2009-04-16

3. Accomplishment Instructions

EFFECTIVITY Before accomplishment of Service Bulletin 44307-500-03, Rev. 2 of the

Goodrich company.

A. Visual check of the boom support:

NOTE Effective for LH and RH installation of external mounted hoist.

NOTE The visual check can be accomplished by maintenance personnel or the

flight crew.

(1) Clean boom support (1, Figure 1) in the marked area and check for cracks. If necessary

use a flashlight and a mirror.

(2) If cracks are detected during the visual check, contact ECD customer support. In this

case the boom support must be removed or replaced before the next flight.

B. Confirm first accomplishment of this Emergency Alert Service Bulletin by an entry in the log

card of the external mounted hoist.

EFFECTIVITY With Revision 1 of this Emergency Alert Service Bulletin an inspection is

specified i.a.w. Service Bulletin 44307-500-03, Rev. 2 of the Goodrich

company.

C. Accomplish Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.

D. Confirm accomplishment of Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company

by an entry in the log card of the external mounted hoist.

4. Appendix

Service Bulletin 44307-500-03, Rev. 2 of the Goodrich company.
EMERGENCY

ALERT SERVICE BULLETIN

MBB BK117 C-2

MBB BK117 C-2-85A-024

PAGE 5 of 5

2009-04-16

REVISION 1, 2010-06-23

Visual check of boom support

Figure 1

1 Boom support

1

2

2

2

Check for cracks.

Boom support with cracks.

Only RH external mounted hoist

shown.

44307-500-03 Apr 30/10

Highlights-1

SENSORS AND INTEGRATED SYSTEMS (HOIST AND WINCH)

1550 S. VALLEY VISTA DR, DIAMOND BAR, CALIFORNIA 91765

TO: HOLDERS OF SERVICE BULLETIN 44307-500-3,Rev.1, DATED APR 21/10 COVERING THE 

BOOM ASSEMBLY, PART NUMBER 44307-500.

REVISION NO. 2, DATED APR 30/10

HIGHLIGHTS

Pages which have been revised are outlines below together with the highlights of the revision. Please 

destroy your obsolete pages of this manual and replace it with Revision No. 2, DATED APR 30/10.

 

PAGE NO. DESCRIPTION OF CHANGE EFFECTIVITY

2 Revise the compliance time to read "within 30 days 

after receipt of this service bulletin".

All

COMMERCE DEPARTMENT "These commodities, technology or 

software were exported from the United States in accordance with the Export 

Administration Regulations. Diversion contrary to U.S. law prohibited."
44307-500-03

Page 1 of 10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - One Time Inspection

Feb 15/10

1. Planning Information

A. Effectivity

This Service Bulletin is applicable to the Boom and Support Assembly, part numbers 

44301-500 and 44307-500. The affected boom and support assemblies are listed in Table 

1. The Boom and Support Assemblies are manufactured by Goodrich Corporation, Sensors 

and Integrated Systems, Diamond Bar, California. 

B. Reason

 During a routine inspection conducted in the field. Four boom and support assemblies 

were found to have cracks on the boom elbow, part number 44307-512 (Figure 1), Testing 

and failure analysis were conducted to identify the cause of the crack. 

The root cause of cracking was found to be due to a customer maintenance error.

A one time visual inspection of the boom and support assembly is performed to ensure no 

cracks exist in other boom and support assemblies. If cracks are found, the boom and 

support assembly is removed from service and return to Goodrich for repair or 

replacement.Refer to paragraph 2.F for current price and RMA number. 

COMMERCE DEPARTMENT "These commodities, technology or software were exported from the United States in 

accordance with the Export Administration Regulations. Diversion contrary to U.S. law prohibited."

C. Description

This service bulletin provides the instructions necessary to perform the one time visual 

inspection and corrective action of the boom and support assembly elbow. The one time 

visual inspection consists of visually inspecting the boom and support assembly elbow. If 

crack (s) are found during the inspection, the boom and support assembly must be 

removed from the helicopter. If no cracks are found, the boom and support assembly may 

Table 1: Affected Boom and Support Serial Numbers

GOODRICH 

PART NUMBER

GOODRICH

SERIAL NUMBER

GOODRICH 

PART NUMBER

GOODIRCH 

SERIAL NUMBER

44301-500 0002 thru 033 44307-500 0002 thru 0186

44307-500 0188 thru 0192

44307-500 0194 thru 0198

44307-500 0200 thru 0203

44307-500 0205 thru 0213
44307-500-03

Page 2 of 10

Feb 15/10

Revision 2-Apr 30/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

remain in service and performance of the repetitive inspection i.a.w Eurocopter Germany 

MBB BK117 C-2-85A-024 or EC135-85A-036 is no longer necessary.

D. Compliance

This mandatory one time inspection must be performed within the next 30 days after receipt 

of this Service Bulletin Compliance is mandatory as defined within the Eurocopter 

Deutschland Service Bulletin.

E. Approval

This service bulletin contains no modification information that revises the approved 

configuration. This modification is in compliance with the existing FAA approved 

configuration. Certification of this Service Bulletin will be with Eurocopter Germany Service 

Bulletin.

F. Manpower

(1) The estimated amount of labor to accomplish the instructions of this Service Bulletin 

for one Boom and Support Assembly is 60 minutes, as follows:

(2) The one time visual Inspection described in this Service Bulletin shall be performed 

by Hoist Operators/Users, Goodrich Corporation, Sensors and Integrated Systems, or 

by personnel and facilities officially authorized by Goodrich Corporation, Sensors and 

Integrated Systems to perform this one time visual inspection.

G. Material — Cost and Availability

(1) Material required to accomplish the instructions of this Service Bulletin for each 

Boom and Support Assembly is located in Table 2.

Remove hoist and boom 

assembly

15 minutes

Inspection 10 minutes

Corrective action 20 minutes

Install hoist and boom 

assembly

15 minutes
44307-500-03

Page 3 of 10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - One Time Inspection

Feb 15/10

NOTE: *Corrosion Inhibitive compound, part number 148927 (PPG/PRC Desoto 

International, part number CA 1000, 2820 W. Empire Av. Burbank, CA 91504) may 

be used as an alternate.

NOTE: **Equivalent items can be use.

H. Tooling - Price and Availability

None.

I. Weight and Balance

Not affected.

J. Electrical Load Data

Not affected.

K. Software Accomplishment Summary

Table 2. Materials Required

NEW P/N DESCRIPTION OLD P/N QTY

*148931 Joint Compound (Mastinox, 6856K 

MIL-P-8116B)

----- AR

148851 Polyurethane 

Paint, Fed-Std. 595 Mil-C-85285-Type 

I,II or III, 

Class H-Lusterless BlackColor No. 37038

----- AR

146028 Wash Primer, Mil-C-8514 ----- AR

146030 Epoxy Primer, MIL-P-23377 ----- AR

----- Alodine, MIL-C-5541, Class 1A, ----- AR

SBL 44307-500-03 Service Bulletin label ----- 1

** PR1440 or PR1422 Sealant ----- AR

**SK-416 Dye Penetrant Kit

Magnaflux/ITW

----- 1
44307-500-03

Page 4 of 10

Feb 15/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

None.

L. Reference

Goodrich Corporation Component Maintenance Manual 25-00-21-1

M. Other Publications Affected

None.

2. Accomplishment Instructions

A. Prepare for inspection

NOTE: Refer to the rescue hoist Component Maintenance Manual (CMM) 25-00-21-

1 for detail removal instructions. Refer to ECD LOAP document for current 

revision level.

(1) Set the rescue hoist power source OFF. Disconnect and remove the external 

electrical power source from the helicopter.

(2) Remove the rescue hoist from the boom and support assembly in accordance with 

the instructions in the appropriate CMM.

(3) Remove the boom and support from the helicopter in accordance with the instructions 

in the appropriate CMM.

NOTE: Penetranting oil may be required to remove the boom tube from the elbow.

(4) Remove the boom tube assembly from the elbow assembly in accordance with the 

instructions in the appropriate CMM.

(5) Clean the external and internal surface of the elbow where the crack or crack (s) are 

suspected (refer to Figure 1). 

(6) Remove minor corrosion in accordance with the instructions in the appropriate CMM.

B. Inspection
44307-500-03

Page 5 of 10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - One Time Inspection

Feb 15/10

NOTE: Crack or crack (s) are not allowed on any surface of the boom and support 

assembly. The unserviceable boom and support assembly must be removed 

from the helicopter.

NOTE: Conduct all checks under a strong light and 5x-power to 10x-power 

magnification to detect surface flaws. 

(1) Visually inspect the internal and external surfaces of the of the boom and support 

elbow for cracks (Refer to Figure 1). If necessary, Perform dye penetrant inspection to 

confirm the suspected crack or crack (s). (refer to Step D). 

(2) If the suspected crack or crack(s) are confirmed. Do not install the unserviceable 

boom and support assembly onto the helicopter. Send the unserviceable boom and 

support assembly to Goodrich repair center for replacement of the failed components. 

(3) If no cracks are found return the boom and support assembly to service after 

performing step C.(1) below.

C. Final Assembly

NOTE: Refer to the rescue hoist Component Maintenance Manual (CMM) 25-00-21-

1 for detail installation instructions.

(1) To mitigate the risk of damage to the boom and support assembly with no crack or 

crack(s) due to intrusion of corrosive elements perform the following steps:

(a) Apply a uniform thin film of joint compound on the entire mating surfaces of the 

elbow and boom tube.

(b) Install the boom tube into the elbow and rotate to ensure uniform distribution of 

the joint compound. Wipe off excess material from the boom tube and elbow.

(c) Install the mounting hardware. Torque the mounting hardware nuts to 8 to 12 inlbs (.9 N•m to 1.2 N•m). beyond running torque of the lock nut.

(d) Seal around the outside of the boom tube at the outboard face of the boom 

elbow using PR1440 or PR1422. Equivalent items can be used. See Figure 1.

(2) Install the boom and support on the helicopter in accordance with the instructions in 

the appropriate CMM.

(3) Install the rescue hoist on the boom and support assembly in accordance with the 

instructions in the appropriate CMM.

D. Dye Penetrant Inspection (DPI)
44307-500-03

Page 6 of 10

Feb 15/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

WARNING: DYE PENETRANT IS COMBUSTIBLE AND MODERATELY TOXIC TO SKIN, 

EYES, AND RESPIRATORY TRACT. PROTECTION: CHEMICAL SPLASH 

PROOF GOGGLES, GLOVES, AND FORCED VENTILATION OR 

RESPIRATOR; KEEP CONTAINER CLOSED; KEEP SPARKS, FLAMES, AND 

HEAT AWAY. KEEP PENETRANT OFF SKIN, EYES, AND CLOTHES; DO NOT 

BREATHE VAPORS.

NOTE: The dye penetrant procedures contained in the dye penetrant kit supersedes the 

generic steps below.

(1) Clean the area to be inspected as follows

(a) Clean the test surface to remove any dirt, paint, oil, grease or any loose scale 

that could either keep penetrant out of a defect, or cause irrelevant or false 

indications. 

NOTE: Smaller flaws will require a longer penetration time

(2) Apply penetrant to the test surface. Allow approximately 10 to 30 minutes for the 

penetrant to soak into any flaws.

(3) Remove excess penetrant from the surface

(4) Apply the developer to the surface.

(5) Inspect the test area within 10 minutes after the developer is applied.

(6) Clean the test area.

E. Paint and Protect Surface (Repair)

(1) Protect the surface Inspected as follows:
44307-500-03

Page 7 of 10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - One Time Inspection

Feb 15/10

(a) If the painted surface requires repair polish the area with aluminum oxide cloth, 

A-A-1048, or crocus cloth, A-A-1206, as applicable.

WARNING: CHEMICAL FILM (ALODINE), MIL-C-5541, IS TOXIC TO SKIN, EYES AND 

RESPIRATORY TRACT. AVOID SKIN AND EYE CONTACT. GOOD GENERAL 

VENTILATION IS NORMALLY ADEQUATE.

(b) Apply a protective chemical film, Alodine, MIL-C-5541, Class 1A, to exposed 

aluminum repair areas.

(c) Prepare the exposed metal surface area by masking off the area to be painted

(d) Paint the exposed surfaces as follows:.

1 Apply one coat of primer coat, MIL-C-8514.

2 Apply one coat of primer coat, MIL-P-23377, Type I, CL C

3 Apply one coat of polyurethane, top coat. Refer to Table for paint color.

(e) Remove the masking material after painting.

 Marking

(1) The incorporation of this one time inspection and Corrective Action service bulletin is 

to be documented on the hoist maintenance records or log-card. 

(2) Upon successful completion of functional check enter the date the modification was 

completed on the label’s “DATE” field with black ink.

(3) Attach Service Bulletin Label SBL 44307-500-03 on the boom and support assembly.

F. Point of Contact

To notify Goodrich of the one time inspection finding. Please contact one of the Goodrich 

Representatives at the address listed below:
44307-500-03

Page 8 of 10

Feb 15/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

Goodrich Corporation,

Sensors and Integrated Systems (SIS)

Diamond Bar, California

Attn: Joe Rumolo

Phone: 909-569-0231

FAX: 909-569-0387

For RMA Number:

Danna O’Donnell

Phone: 909-569-0240

FAX: 909-569-0387
44307-500-03

Page 9 of 10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - One Time Inspection

Feb 15/10

3. Material Information

Table 3: Material Information 

NOTE: * Corrosion Inhibitive compound, part number 148927 (PPG/PRC Desoto 

International,part number CA 1000, 2820 W. Empire Ave. Burbank, CA 91504) 

may be used as an alternate.

NOTE: ** Equivalent items can be use.

***NOTE: Order Service Bulletin Kit SBK 44307-500-03

NEW P/N QTY

UNIT 

PRICE DESCRIPTION OLD P/N

INSTRUCTIONS/ 

DISPOSITION 

*148931 AR ----- Joint Compound (Mastinox, 

6856K 

MIL-P-8116B)

----- Install on the 

entire mating surface of the elbow 

and tube.

148851 AR ----- Polyurethane 

Paint, Fed-Std. 595 Mil-C85285-Type I,II or III, 

Class H-Lusterless BlackColor No. 37038

----- Apply one coat of 

paint.

146028 AR ----- Wash Primer, Mil-C-8514 ----- Apply one coat of 

wash primer.

146030 AR ----- Epoxy Primer, MIL-P23377----- Apply one coat of 

epoxy primer

----- AR ----- Alodine, 

MIL-C-5541, Class 1A, 

----- Apply Alodine, 

MIL-C-5541, 

Class 1A, to

exposed 

aluminum repair

areas.

**SK-416 1 ----- Dye Penetrant Kit

Magnaflux/ITW

----- Use to perform 

Penetrant test if 

crack or crack (s) 

are suspected.

** PR1440 or PR 

1422

AR ----- Sealant ----- Apply to seal the 

boom gap.

***SBL 44307-

500-03

1 ----- Service Bulletin label ----- Install on boom 

support assembly 
44307-500-03

Page 10 of 10

Feb 15/10

Revision1- Apr 21/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

.

Figure 1. Boom and Support Assembly

44307-500-03

Page 10 of 10

Feb 15/10

Revision1- Apr 21/10

SERVICE BULLETIN

Equipment/Furnishings - Boom and Support Assembly - 

One Time Inspection and Corrective Action

.

Figure 1. Boom and Support Assembly