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SERVICE BULLETIN

MANDATORY

Issued: November, 2013 SB 28-4131

The export of these commodities, technology or software are subject to the U.S. Export

Administration Regulations. Diversion contrary to U.S. law is prohibited. For guidance on

export control requirements, contact the Commerce Department's Bureau of Export

Administration at http://www.bis.doc.gov. 

Beechcraft Corporation (BC) issues Service Information for the benefit of owners and fixed

base operators in the form of two classes of Service Bulletins. The first class, Mandatory

Service Bulletins (red border) includes changes, inspection and modifications that could

affect safety or crashworthiness. BC also issues Service Bulletins with no red border which

are designated as either recommended or optional in the compliance section within the

bulletin. In the case of recommended Service Bulletins, BC feels the changes, modifications,

improvements or inspections will benefit the owner/operator and although highly

recommended, Recommended Service Bulletins are not considered mandatory at the time of

issuance. In the case of Optional Service Bulletins, compliance with the changes,

modifications, improvements or inspections is at the owner/operator's discretion.

Both classes are available on the web at http://pubs.beechcraft.com and mailed to:

(a) Owners of record on the FAA Aircraft Registration Branch List and the BC

Safety of Flight Information (SOFI) List.

(b) Those having a publications subscription.

Information on Safety of Flight Information (SOFI) or subscription can be obtained through

the Beechcraft Corporation Technical Manual Distribution Center (TMDC). As Mandatory

Service Bulletins and Service Bulletins are issued, the Service Bulletin Master Index will be

updated and available online at http://pubs.beechcraft.com. Warranty will be allowed only

when specifically defined in the Service Bulletin and in accordance with BC Warranty Policy.

Unless otherwise designated, BC Mandatory Service Bulletins, Service Bulletins and BC Kits

are approved for installation on BC airplanes in original or BC modified configurations only.

BC Mandatory Service Bulletins, Service Bulletins and Kits may not be compatible with

airplanes modified by STC installations or modifications other than BC approved kits.

1. Planning Information

A. Effectivity

(1) Airplanes

Model G58 Baron, Serials TH-2356 through TH-2378.

If you are no longer in possession of the airplane, please forward this information to the present

owner.

(2) Spares

The following fuel cells are suspect if ordered from Beechcraft (HBP&D) between January 2012 and

November 2013 on Baron Model 95, B95, B95A, D95A, E95, 95-55, 95-A55, 95-B55, 95-B55A, 

95-B55B (T-42), 95-C55, 95-C55A, D55, D55A, E55, E55A, 56TC, A56TC, 58, 58A, and G58:

TITLE: FUEL - INSPECTION/REPLACEMENT OF FUEL CELLS

Part Number Description

60-921046-5 Leading Edge Outboard Fuel Cell, Left

60-921046-6 Leading Edge Outboard Fuel Cell, Right

002-920034-9 Leading Edge Inboard Fuel Cell, Left

002-920034-10 Leading Edge Inboard Fuel Cell, Right

58-380003-13 Center Tank Fuel Cell, Left

58-380003-14 Center Tank Fuel Cell, Right
SERVICE BULLETIN

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MANDATORY

B. Reason

This Service Bulletin is being issued to address potential fuel leaks in defined fuel cells installed in the

wings. 

C. Description

This Service Bulletin provides instructions to remove and replace suspect fuel cells with new fuel cells, in

accordance with definitions provided in Table 1 of Paragraph 3.A. 

D. Compliance

An Airworthiness Directive will be requested on the matter covered by this Service Bulletin.

Beechcraft Corporation considers this to be a Mandatory Service Bulletin. Airplanes with 150 or more flight

hours shall remove and replace applicable fuel cells at the next annual inspection or 100 flight hours,

whichever occurs first. Airplanes with less than 150 flight hours shall remove and replace applicable fuel

cells within 20 flight hours from issuance of this Service Bulletin. 

NOTE

Until such time as this Service Bulletin has been complied with, reference Safety

Communique 332. 

E. Approval

The engineering data contained in this Service Bulletin is FAA approved. 

Prior to accomplishment, owners/operators of airplanes registered in countries other than the United

States shall consult with their local Aviation Regulatory Authority.

Incorporation of this Service Bulletin restores the airplane to original Type Design. 

F. Manpower

The following information is for planning purposes only:

Estimated man-hours for inspection: 12 hours

Suggested number of technicians for inspection: 1

Estimated man-hours for modification: 16 hours per fuel cell, not to exceed 96 hours

Suggested number of technicians: 2

The above is an estimate based on experienced, properly equipped technicians complying with this

Service Bulletin. Occasionally, after work has started, conditions may be found that could result in

additional man-hours.
SERVICE BULLETIN

Issued: November, 2013

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SB 28-4131

MANDATORY

G. Weight and Balance

Negligible.

It is the responsibility of the owner/operator to maintain compliance with the applicable Airworthiness

Regulations.

H. Electrical Load Data

No change.

I. Software Accomplishment Summary

Not applicable.

J. References

Baron 55 and 58 Maintenance Manual, P/N 55-590000-13G5, Chapter 28;

Beechcraft Baron 56TC and A56TC Turbo-Baron Shop Manual, P/N 96-590003-5B, Revision 

96-590003-5B5, Section 8;

Beechcraft Travel Air 95 Series Shop Manual, P/N 95-590001-1C, Revision 95-590001-1C5, Section 4; 

Beech Baron 58P and 58TC Maintenance Manual, P/N 102-590000-5A, Revision A25, Chapter 28;

Safety Communique 332. 

K. Publications Affected

It is recommended that a note, “See Service Bulletin 28-4131,” be made in the appropriate chapter of the

Illustrated Parts Catalog. 

L. Interchangeability of Parts

Not applicable.
SERVICE BULLETIN

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MANDATORY

M. Warranty Credit 

Warranty credit for labor and parts obtained from Beechcraft Corporation or Hawker Beechcraft Services,

to the extent noted under MANPOWER and MATERIAL, will be allowed on all airplanes meeting all the

following criteria:

(1) Airplane owners must have active Standard Warranty coverage and/or an active Beechcraft

Maintenance program with applicable Service Bulletin coverage for the subject airplane when the

Service Bulletin is issued.

(2) Standard Warranty coverage and/or Beechcraft Maintenance Program must be active for the subject

airplane on the day the work is accomplished. 

(3) The work shall be accomplished in accordance with the criteria defined in Paragraph 1.D.,

COMPLIANCE. 

(4) The work shall be accomplished in accordance with criteria defined in Paragraph 3,

ACCOMPLISHMENT INSTRUCTIONS.

(5) The work shall be accomplished at Hawker Beechcraft Services or an Authorized Service Center

(ASC) rated to perform maintenance on the specific model of Beechcraft airplane. 

(6) While work shall be accomplished in accordance with the criteria defined in Paragraph 1.D,

COMPLIANCE, warranty coverage offered in this Service Bulletin will expire 12 months from the last

day of the month this Service Bulletin is issued. After this date, the owner/operator assumes the

responsibility for compliance cost.

(7) Claims for compliance with this Service Bulletin (SB) are to be filed as a W4-type claim against SB

28-4131.

(8) After the Service Bulletin has been accomplished, a warranty claim must be submitted to HBC within

60 days of the Service Bulletin completion date. 

Beechcraft Corporation (BC) reserves the right to void continued airplane warranty coverage in the area

affected by this Service Bulletin until the date the Service Bulletin is accomplished.

The owner/operator should contact Hawker Beechcraft Services or an ASC to schedule the warranty work

to be accomplished. Hawker Beechcraft Services or an ASC must submit the appropriate paperwork

directly to the Beechcraft Warranty Department for warranty consideration.

2. Material Information

A. Materials - Price and Availability

Contact information:

Hawker Beechcraft Parts & Distribution (HBP&D)

10511 East Central Avenue

Wichita, KS 67206

USA

Phone: 316-676-3100 or 1-888-727-4344

Fax: 316-676-3222 or 316-676-3327

E-mail: parts@beechcraft.com
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SB 28-4131

MANDATORY

B. Industry Support

Not applicable.

C. Airplanes

(1) The following parts required for accomplishment of this Service Bulletin may be ordered through

Hawker Beechcraft Services, an ASC, or HBP&D:

Beechcraft Corporation expressly reserves the right to supersede, cancel and/or declare obsolete,

without prior notice, any parts or publications that may be referenced in this Service Bulletin.

(2) The following materials may be obtained locally:

Part Number Description Quantity Per 

Airplane

60-921046-1 Leading Edge Outboard Fuel Cell, Left As Required

60-921046-2 Leading Edge Outboard Fuel Cell, Right As Required

002-920034-1 Leading Edge Inboard Fuel Cell, Left As Required

002-920034-2 Leading Edge Inboard Fuel Cell, Right As Required

58-380003-5 Center Tank Fuel Cell, Left As Required

58-380003-6 Center Tank Fuel Cell, Right As Required

WWD82 Clamp As Required

NAS1924-114 or WWD114 Clamp As Required

52KS3 or 4852SS305 Clamp As Required

002-920020-1 Gasket As Required

35-921502 Gasket As Required

Part Number Description Quantity Per 

Airplane

Polyken 231 or ASTMD5486, Type IV, Class ITape, Pressure-Sensitive As Required
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MANDATORY

D. Spares

Not applicable.

E. Reidentified Parts

None.

F. Tooling - Price and Availability 

Not applicable.

3. Accomplishment Instructions

This Service Bulletin shall be accomplished as follows:

NOTE

Should any difficulty be encountered in accomplishing this Service Bulletin,

contact Beechcraft Corporation at 1-800-429-5372 or 316-676-3140.

Observe all Warnings and Cautions contained in the airplane manuals

referenced in this Service Bulletin.

Whenever any part of this system is dismantled, adjusted, repaired or

renewed, detailed investigation must be made on completion to make sure

that distortion, tools, rags or any other loose articles or foreign matter that

could impede the free movement and safe operation of the system are not

present, and that the systems and installations in the work area are clean.

A. Airplane

(1) Perform the following Steps (1)(a) through (1)(f) to inspect part numbers of all six fuel cells in

accordance with Table 1 below. Fuel Cell part numbers that are listed in the Fuel Cell P/N to be

Removed column shall be replaced by part numbers in the Fuel Cell P/N to be Installed column.

Table 1

Fuel Cell P/N to be Removed Fuel Cell P/N to be Installed

P/N 60-921046-5, Leading Edge Outboard Fuel

Cell, Left

P/N 60-921046-1, Leading Edge Outboard Fuel

Cell, Left

P/N 60-921046-6, Leading Edge Outboard Fuel

Cell, Right

P/N 60-921046-2, Leading Edge Outboard Fuel

Cell, Right

P/N 002-920034-9, Leading Edge Inboard Fuel

Cell, Left

P/N 002-920034-1, Leading Edge Inboard Fuel

Cell, Left
SERVICE BULLETIN

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SB 28-4131

MANDATORY

At all locations during the incorporation of this Service Bulletin, inspect for

the existence of and damage from foreign objects (FOD). All foreign objects

shall be removed and any damage shall be addressed in accordance with

the applicable Baron Maintenance Manual or Shop Manual. 

(a) Remove all power from the airplane and disconnect the battery. Display warning notices

prohibiting reconnection of airplane electrical power.

Review fuel handling and fuel cell maintenance procedures warnings and

cautions contained in Baron Maintenance Manual or Shop Manual. 

(b) Defuel the airplane in accordance with the applicable chapter/section of the appropriate

Maintenance Manual or Shop Manual.

(c) Remove lower and upper access panels to enable replacement of the inboard, outboard and

center section fuel cells. Refer to Figure 1.

(d) Remove the respective fuel cell doors to gain access to the fuel cells. These doors are located

behind access panels removed in Step (1)(c).

(e) Remove the exhaust heat shields to enable access to fuel cells. Refer to Figure 1.

(f) Use an explosion proof flashlight and mirror as needed to inspect the top and middle of all

existing fuel cells to determine which part numbers have been installed. Fuel Cell part numbers

that are listed in the Fuel Cell P/N to be Removed column of Table 1 shall be replaced by part

numbers in the Fuel Cell P/N to be Installed column.

(2) Remove the applicable fuel cell(s), as defined in Step (1), in accordance with the applicable 

chapter/section of the appropriate Maintenance Manual or Shop Manual.

(3) Along all areas of the fuel bay liners, verify that tape is installed over rivets and sheet metal edges,

and that no foreign objects are present. If any foreign objects exist or tape is found to be missing

from edges, remove the foreign objects and install tape over defined areas. 

P/N 002-920034-10, Leading Edge Inboard Fuel

Cell, Right

P/N 002-920034-2, Leading Edge Inboard Fuel

Cell, Right

P/N 58-380003-13, Center Tank Fuel Cell, Left P/N 58-380003-5, Center Tank Fuel Cell, Left

P/N 58-380003-14, Center Tank Fuel Cell, Right P/N 58-380003-6, Center Tank Fuel Cell, Right

Table 1

Fuel Cell P/N to be Removed Fuel Cell P/N to be Installed
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MANDATORY

(4) Install the applicable new fuel cell(s), as defined in Step (1), in accordance with guidelines provided

in the applicable chapter/section of the appropriate Maintenance Manual or Shop Manual, in

conjunction with the following Steps (4)(a) through (4)(f):

NOTE

Verify interconnect tube position relative to the spar. If the interconnect tube is not

correctly positioned, unintended loads could be induced on the fuel cell.

(a) Apply forward pressure to the aft side of each interconnect tube. If the interconnect tube(s) are

installed correctly the tube bead should come against the spar and not continue to the leading

edge fuel cell area (Refer to Figure 3). If the interconnect tube is not installed correctly remove

the interconnect tube and install correctly per Figure 3. If the tube is installed correctly proceed

to the next step. 

(b) The purpose of this step is to verify that the fuel cell is positioned tight against the spar. If the fuel

cell is not tight against and supported by the spar, unintended loads could be induced on the fuel

cell. Hold forward pressure on the aft side of the interconnect tube(s), access the forward side of

the interconnect tubes in the inboard and outboard leading edge fuel cells and ensure that the

leading edge inboard and outboard fuel cells, at each interconnect tube, are tight against the

forward side of the spar. If not tight, reposition nipple, ensuring it is tight against the forward face

of the spar. 

(c) Reinstall center tank nipples to interconnect tubes and ensure that the fuel cell is tight against

the aft face of the fuel bay liner. 

(d) Install new clamps, P/N WWD82, as applicable, to interconnect tube, P/N 002-920012-53.

Ensure that the clamps are torqued to 30-35 inch-pounds. Install new clamps, P/N WWD114 (or

equivalent P/N NAS1924-114), as applicable, to interconnect tube, P/N 002-920012-51. Ensure

that the clamps are torqued to 35-40 inch-pounds.

(e) When assembling wet wing interconnect tube P/N 60-921047-1 into leading edge outboard fuel

cell, use new clamp, P/N 52KS3 or P/N 4852SS305, as needed. Torque to 20-25 inch-pounds.

(f) Ensure that the hanger snap clips are properly fastened on the top of each fuel cell.

(5) Install the respective fuel cell doors, using new gaskets, P/N 002-920020-1 (As Required) and 

P/N 35-921502 (As Required). Install fuel access panels. Install any other access panels that were

removed to gain access to the applicable fuel cells. 

(6) Install exhaust heat shields. 

(7) Reconnect the airplane battery, remove warning notices, and restore power.

(8) Fully fuel the airplane in accordance with guidelines provided in the applicable chapter/section of the

appropriate Maintenance Manual or Shop Manual. A minimum of four hours after fueling the

airplane, check for leaks.

(9) Ensure all work areas are clean and clear of tools and miscellaneous items of equipment.

(10) Return airplane to service.

B. Spares

Review fuel cell configuration as defined in Paragraph 1.A.(2) of this Service Bulletin.

C. Record of Compliance

Upon completion of this Service Bulletin, make an appropriate maintenance record entry.
SERVICE BULLETIN

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SB 28-4131

MANDATORY

B413103.AI

LOWER ACCESS PANELS

UPPER ACCESS PANEL LOCATIONS

HEAT SHIELD 

SHOWN REMOVED

FUEL ACCESS 

Access Panel Locations

Figure 1
SERVICE BULLETIN

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MANDATORY

B413101.AI

WET WING INTERCONNECT CENTER TANK FUEL CELL

TUBE P/N 60-921047-1

LEADING EDGE

OUTBOARD FUEL CELL

LEADING EDGE

INBOARD FUEL CELL

WET WING

CLAMP P/N 52KS3 OR

P/N 4852SS305,

(1 EACH - LEFT AND RIGHT)

P/N 002-920012-53 

INBOARD INTERCONNECT TUBE

WWD82 CLAMP

(4 EACH - LEFT AND RIGHT)

P/N 002-920012-51 

OUTBOARD INTERCONNECT TUBE

WWD114 OR NAS1924-114 CLAMP

(2 EACH - LEFT AND RIGHT)

(LEFT WING SHOWN, RIGHT OPPOSITE)

Fuel Cells

Figure 2
SERVICE BULLETIN

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SB 28-4131

MANDATORY

B413102.AI

THE MIDDLE BEAD OF THE INTERCONNECT TUBE SHOULD BE ON THE AFT SIDE OF THE SPAR. THE INTERCONNECT

TUBE SHOULD BE STICKING OUT OF THE NIPPLE ON BOTH SIDES FOR THE MID-BOARD AND INBOARD TUBES. THE 

OUTBOARD TUBE SHOULD BE FLUSH OR SLIGHTLY IN OR OUT DEPENDING ON TOLERANCES. 

VIEW SHOWING THE MIDDLE BEAD OF THE 

P/N 002-920012-51 OR -53 INTERCONNECT

TUBE LOCATED ON THE AFT SIDE OF THE

SPAR.

BEAD SHOULD BE LOCATED FIRMLY

AGAINST SPAR TO ALLOW PROPER 

FIT AT FUEL CELL INSTALLATION. 

FWD

A

B

B

A FOR THE -51 2.60 INCHES

FOR THE -53 3.00 INCHES

FOR THE -51 2.90 INCHES

FOR THE -53 4.80 INCHES

SPAR

FUEL BAY

LINER (REFERENCE DIMENSIONS ONLY)

Fuel Cell Installation Requirements

Figure 3