SB

- 18, Revision A Issued: 03/15/2011

Original Issue Date: 10/14/2010 Page 1 of 4 Distributed by: Manufactured By:

1. Applicability : Except as noted in the “Exempted MFB Carburetors” section below, this

service bulletin applies to all machined from billet (MFB) HA

- 6 TM carburetors , including

but not necessarily limited to the following part numbers (including all dash numbers) :

10

- 5219

- XX , 10

- 5224

- XX, 10

- 5230

- XX, 10

- 5235

- XX, 10

- 5253

- XX, 10

- 5255

- XX, 10

-

5283

- XX, 10

- 6001

- XX, 10

- 6019

- XX, and 10

- 6030

- XX, regardless of whether the

carburetor is new, rebuilt, overhauled or used, and regardless of what agency performed

service on the carburetor(s) in the past

. M FB HA

- 6 TM carburetors are found on various

Lycoming engine models , possibly on engines made by other manufacturers, and on

certificated and non

- certificated aircraft of various types

. This bulletin applies only to

MFB HA

- 6 TM carburetors, it does NOT apply to die

- cast HA

- 6 TM carburetors. (See Figure

3 below)

Exempted MFB Carburetors

– This bulletin does not apply to MFB HA

- 6 TM carburetors

manufactured by Marvel

- Schebler Aircraft Carburetors LLC (MSA), formerly known as

Volare C arburetors LLC and having a serial number listed below. This SB likewise does

not apply to any MFB HA

- 6 TM carburetors that MSA serviced after October 10, 2010, or

to any MFB HA

- 6 TM carburetor bearing :

A. “IC” number of 17 or higher on the data plate ;

B. O ne of the following or higher serial numbers stamped on the carburetor data

plate in cases where the original data plate and original carburetor body

combination remai ns unchanged; 

## Marvel

- Schebler Aircraft

Carburetors LLC

125 Piedmont Avenue

Gibsonville, N.C. 27249, USA

Phone: 336

- 446

- 0002 // 0005

Fax: 336

- 446

- 0007

Email: customerservice@msacarbs.com

Website: www.msacarbs.com 

# EMERGENCY

Service Bulletin: SB

- 18 Rev A

Original Date: October 1 4 th 

## , 2010

R evision D ate : March 15 th 

## , 2011



## SUBJECT: LOOSE MIXTURE SLEEVES

- BEFORE FURTHER FLIGHT

AVOID SERIOUS RISK OF INJURY OR DEATH

MN353303 MS385901 VC213901 VC307001 VN041603 VN067103 VN148901

MN353304 MS392501 VC224401 VC334201 VN041604 VN091501 VN158301

MN353305 MS392901 VC230501 VC346701 VN041605 VN091502 VN226403

MN382201 MS392902 VC238401 VC356501 VN041606 VN091503 VN244301

MS357901 MS392903 VC242401 VN026601 VN041607 VN091504 VN244305SB

- 18, Revision A Issued: 03/15/2011

Original Issue Date: 10/14/2010 Distributed by: Manufactured By:

C. The letters NWP and/or 8

- 08 (or numbers representing a month and year later than

August 2008) stamped in the airbox flange and/or the engine flange gasket surface.

(See Figure 1) , or ;

D

. A laser marking affixed to the carburetor by Marvel

- Schebler ®

o n the bottom of the

carburetor float bowl as shown in Figure 2 indicating that the carburetor is in

compliance with this service bulletin. MS364001 VC140601 VC242402 VN026602 VN041609 VN091505 VN292901

MS366301 VC140602 VC249201 VN026603 VN041610 VN091506 VN297501

MS366501 VC140701 VC249202 VN026604 VN043801 VN091507 VN298301

MS370501 VC171301 VC249203 VN026605 VN043802 VN091508 VN313804

MS370503 VC171401 VC249204 VN026606 VN043803 VN111203 VN313805

MS372301 VC181101 VC249205 VN026607 VN043804 VN111204 VN314601

MS378301 VC181102 VC260801 VN026608 VN043805 VN111205 VN314602

MS385201 VC181103 VC260802 VN041001 VN043806 VN134001 VN326701

MS385202 VC210701 VC264101 VN041201 VN067101 VN134003 VN326703

MS385203 VC213401 VC264102 VN041601 VN067102 VN134004 VN326704

VN326705

Page 2 of 4 Figure 1 NOTE: If the carburetor body has been replaced, the serial number is not exempt.SB

- 18, Revision A Issued: 03/15/2011

Original Issue Date: 10/14/2010 Distributed by: Manufactured By:

CAUTION: Some over

- haulers have substituted data plates bearing their own names and/or

logos on carburetors originally manufactured by M SA or its predecessors. Such obfuscation of

the actual manufacturer of an aircraft component can lead to confusion as to wh at service

bulletins and or Airworthiness Directives apply to what units ( see MSA Service Bulletin SB

- 16 )

. Regardless of what name or logo appears on the dat a plate , this service bulletin applies to every

MFB HA

- 6 TM carburetor ori ginally manufactured by MSA or its predecessors unless it is

specifically exempted above.

NOTE : Machined From Billet (MFB) HA

- 6 TM carburetors can be identified by their faceted,

milled surfaces (most MFB HA

- 6 TM carburetors were originally anodized a golden color. Color

alone should not be the sole factor in determining if a HA

- 6 TM carburetor was made from billet or

was die cast. A die

- cast carburetor may have been painted or the gold anodizing could have been

removed from the MFB) See Figure 3 & 4 below. Do not confuse MFB HA

- 6 TM carburetors with

die

- cast HA

- 6 TM carburetors.

`

ORIG INAL GOLD

COLOR ORIGINA L GREY

COLOR DIE CAST BODY

(Smooth Body) MACHINED FROM

BILLET BODY

(Faceted Body)

I.C. NUMBER

SERIAL

NUMBER

Figure 4

Page 3 of 4 Figure 3



### Figure 2SB

- 18, Revision A Issued: 03/15/2011

Original Issue Date: 10/14/2010 Distributed by: Manufactured By:

2. Reason : M arvel

- Schebler ® has discovered a very dangerous problem involving loose

mixture control sleeves or sleeves that might become loose and is issuing this SB to

inform over

- haulers, owners, and operators of serious issues with certain MFB HA

- 6 TM

c arburetors

.

3. Backg round : This service bulletin is prompted by a reported in

- flight loss of engine

power resulting in the forced landing of an aircraft equipped with a made from billet

HA

- 6 TM carburetor. Upon inspection, M arvel

- Schebler TM determined that the carburetor’s

mixture control sleeve was loose and had rotated in the carburetor body. If a mixture

sleeve rotates sufficiently it will interrupt fuel flow to the engine.

4. Procedure :

A. For every affected MFB HA

- 6 TM carbu retor installed on an aircraft, prior to further flight:

i. R emove the carburetor and send it to Marvel

- Schebler ® for inspection and

possible repair before re

- install ing on the aircraft ;

ii. Replace the carburetor with a serviceable MFB HA

- 6 TM carburetor of the

proper part number that is exempt from this SB; or,

iii. Replace the carburetor with a serviceable die

- cast HA

- 6 TM carburetor of the

proper part number.

B. For every affected MFB HA

- 6 TM carburetor in inventory or otherwise not installed o n

an aircraft, prior to releasing such carburetors for flight, submit such carburetors to

M arvel

- S chebler ® for inspection and possible repair.

5. Voiding of Warranty and Waiver of Liability : Operation of a carburetor in which other

than genuine Marvel

- Schebler ® approved parts are installed voids any otherwise

applicable warranty and constitutes a complete and total waiver to the extent

permitted by law of any and all rights the owner, operat or and/or service facility or

repairer may have had to hold M arvel

- Schebler Aircraft Carburetors LLC responsible or

liable for the malfunction or failure of such an aviation carburetor

.

6

. Safety First : Marvel

- Schebler ® is a customer

- service oriented company committed to

technical innovation in pursuit of aviation safety. While Marvel

- Schebler ® has no

authority to compel owners to act responsibly and take prudent action to insure their own

safety and the safety of others

, Marvel

- Schebler ® believes compliance with this

EMERGENCY S ervice B ulletin is important and will help to insure safer

, better

ma intained and better performing products.

Page 4 of 4