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SERVICE BULLETIN

MANDATORY

Issued: August, 2012 SB 55-4114 

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. 

Hawker Beechcraft Corporation (HBC) 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. HBC 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, HBC 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.hawkerbeechcraft.com and mailed to:

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

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 Hawker 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.hawkerbeechcraft.com. Warranty

will be allowed only when specifically defined in the Service Bulletin and in accordance with

HBC Warranty Policy.

Unless otherwise designated, HBC Mandatory Service Bulletins, Service Bulletins and HBC

Kits are approved for installation on HBC airplanes in original or HBC modified configurations

only. HBC Mandatory Service Bulletins, Service Bulletins and Kits may not be compatible

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

1. Planning Information

A. Effectivity

(1) Airplanes

(a) Civil 

Model 1900 Airliner, Serial UA-3;

Model 1900C Airliner, Serials UB-1 through UB-74; UC-1 through UC-174;

Model 1900D Airliner, Serials UE-1 through UE-439.

(b) Military 

Model 1900C (C-12J) Airliner, Serials UD-1 through UD-6.

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

owner.

(2) Spares

None.

B. Reason

This Service Bulletin is being issued because Hawker Beechcraft Corporation (HBC) has determined that

potential exists for development of crack(s) in the forward spar cap angles and upper hat sections on

defined airplanes. HBC has received reports of cracks in this area from two different operators. 

C. Description

This Service Bulletin provides instructions for visual inspection of the forward vertical spar to horizontal

stabilizer attach point angles for any crack(s) in the P/N 101-640011-3/-4 spar cap angles and 

visual inspection of the P/N 114-640000-25/-26 hat section for crack(s). If crack(s) are found, contact

Hawker Beechcraft Airliner Customer Support Group as defined in ACCOMPLISHMENT INSTRUCTIONS. 

TITLE: STABILIZERS - INSPECTION OF FORWARD SPAR ATTACH ANGLES
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MANDATORY

D. Compliance

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

(1) Civil Airplanes

Hawker Beechcraft Corporation considers this to be a mandatory inspection. It must be

accomplished at the next "I" Inspection Check Procedure or 600 flight hours from receipt of this

Service Bulletin, whichever occurs first.

(2) Military Airplanes

For compliance information on military airplanes affected by this Service Bulletin, contact the

appropriate headquarters.

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. 

This Service Bulletin is for inspection only and there is no change to Type Design. 

F. Manpower

The following information is for planning purposes only:

Estimated man-hours for inspection: 1.5 hours

Suggested number of personnel for inspection: 1

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

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

G. Weight and Balance

Not applicable.

H. Electrical Load Data

No change.

I. Software Accomplishment Summary

Not applicable.

J. References

Appropriate chapter of the applicable model manual: 

(1) Civil Airplanes

Hawker Beechcraft Corporation Model 1900/1900C Airliner Maintenance Manual (MM), 

P/N 114-590021-7C7 or subsequent revision, Chapter 6-50;
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MANDATORY

Hawker Beechcraft Corporation Model 1900D Airliner Maintenance Manual (MM), P/N 129-590000-

15B7 or subsequent revision, Chapter 6-50;

Hawker Beechcraft Corporation Model 1900/1900C Airliner Structural Inspection Manual (SIM), 

P/N 98-30937G or subsequent revision, “I” Check;

Hawker Beechcraft Corporation Model 1900D Airliner Structural Inspection Manual (SIM), P/N 129-

590000-65E3 or subsequent revision, “I” Check.

(2) Military Airplanes

Hawker Beechcraft Corporation Model 1900/1900C Airliner Maintenance Manual (MM), 

P/N 114-590021-7C7 or subsequent revision, Chapter 6-50;

Hawker Beechcraft Corporation Model 1900C(C-12J) Maintenance Manual Supplement, 

P/N 98-31326 or subsequent revision, Chapter 6-50.

K. Publications Affected

It is recommended that a note “See Service Bulletin 55-4114” be made in the appropriate chapter of the

applicable Maintenance Manual, Structural Inspection Manual, and Maintenance Manual Supplements.

L. Interchangeability of Parts

Not applicable.

M. Warranty Credit 

None.

2. Material Information

A. Materials - Price and Availability

Contact information:

Hawker Beechcraft Parts & Distribution

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: HBC_Parts@hawkerbeechcraft.com

B. Industry Support

Not applicable.

C. Airplanes

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

through a Hawker Beechcraft Authorized Service Center or HBP&D or obtained locally:
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MANDATORY

Hawker 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.

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

Material Item Number

(Ref. MM Chapter 20) Description Quantity Per 

Airplane

A-A-1491, CCC-C-440 or 

equivalent

Cotton Cheesecloth As Required

A-A-53513 or P/N 187 7711 [1] Gloves, Polyethylene, Industrial, Solvent

Handling

As Required

DOD-R-003081 Rag, Lint-Free As Required

TT-I-735 or MIL-I-10428 Isopropyl Alcohol As Required

TT-N-95, Type II Solvent, Aliphatic Naphtha As Required

MPK [2] Solvent, Methyl Propyl Ketone (MPK) As Required

ASTM D329 Solvent, Acetone As Required

[1] Obtain from Eastman Kodak Company, 343 State Street, Rochester, NY 14650, Website: www.kodak.com, 1-800-242-2424

or 585-724-4000.

[2] Obtain from Barton Solvents, Inc., 201 South Cedar, Valley Center, KS 67147, Website: www.barsol.com, 316-755-2305,

FAX: 316-755-2323; or Eastman Chemical Company, Inc., P. O. Box 511, Kingsport, TN 37662, Website: www.eastman.com,

1-800-EASTMAN (1-800-327-8626) or 423-229-2000, FAX: 423-229-2145. 
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MANDATORY

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

reconnection of airplane electrical power.

Use care to ensure damage to airplane components and structure does not occur

during positioning and movement of maintenance stand.

(2) Utilize a maintenance stand to gain access to the upper forward vertical stabilizer and horizontal

stabilizer, as required to facilitate accomplishment of inspection procedures through access panels.

Remove attachment screws securing access panels 35 (left and right, for Model 1900 and 1900C

airplanes) or access panels 331GL and 331GR (for Model 1900D airplanes) to gain access to the

spar cap angle inspection area. Refer to the applicable airplane Maintenance Manual (MM), Chapter

6-50 and Figures 1 and 2. Retain attachment hardware.

(3) Remove access panel assembly 16 (for Model 1900 and 1900C airplanes) or access panel

assembly 332BTC (for Model 1900D airplanes) to gain access to the upper inspection area. Retain

attachment hardware.

Solvents are flammable and toxic to skin, eyes, and respiratory tract. Skin

and eye protection is required. Avoid repeated or prolonged contact. Keep

away from flames or sources of heat. Use in a well-ventilated area or

respiratory protection equipment may be required.

NOTE

Oil film, dirt and grime can mask areas containing cracks. It may be necessary to

clean components in inspection areas prior to borescope inspection using clean

cotton cheesecloth or a clean shop rag moistened with solvent.

(4) Using a borescope, conduct an inspection of the area shown in Figure 1, Detail C for crack(s) in the

P/N 101-640011-3/-4 spar cap angles. Using a flashlight and mirror, visually inspect the P/N 114-

640000-25/-26 hat sections for cracks as shown in Figure 2, Detail C and the applicable airplane

Structural Inspection Manual, “I” Check procedures.
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MANDATORY

(5) If crack(s) are found in any P/N 101-640011-3/-4 spar angles or the P/N 114-640000-25/-26 hat

sections, contact Hawker Beechcraft Airline Customer Support Group at 1-800-429-5372 or 316-

676-3140 for disposition.

(6) If inspections of the P/N 101-640011-3/-4 spar cap angles and P/N 114-640000-25/-26 hat sections

reveal no crack(s), proceed with access panel installation.

(7) Install access panels 35 (L and R) and access panel assembly 16 (for Model 1900 and 1900C

airplanes) or access panels 331GL and 331GR, and panel assembly 332BTC (for Model 1900D

airplanes) utilizing retained attachment hardware. Refer to MM, Chapter 6-50. 

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

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

(10) Return airplane to service.

B. Spares

Not applicable.

C. Record of Compliance

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

B411401.AI

FWD

HAT SECTION

(SKIN REMOVED FOR CLARITY)

HAT SECTION

EXAMPLE OF CRACK

IN P/N 101-640011-3

SPAR CAP ANGLE

INSPECTION

AREA

VERTICAL

STABILIZER

FWD SPAR

FWD

DETAILA

DETAILB

DETAILC

C

ACCESS PANEL 35L

(1900, 1900C, SHOWN)

 35R (OPPOSITE)

 OR

ACCESS PANEL 331GL

(1900D, SHOWN)

331GR (OPPOSITE)

A

B

Inspection of Vertical Stabilizer Forward Spar Cap Angle and Hat Section for Cracks

Figure 1
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MANDATORY

B411402.AI

C

P/N 114-640000-25

LEFT HAT SECTION

P/N 114-640000-26

RIGHT HAT SECTION

(HORIZONTAL ATTACH POINT)

RIB

ANGLE

P/N 101-640011-4 SPAR CAP ANGLE

AREA OF INTEREST P/N 101-640011-3 SPAR CAP ANGLE

AREA OF INTEREST

ATTACH

FITTING

ATTACH

FITTING

DETAILB

DETAILC

ACCESS PANEL

16 (1900, 1900C,)

(COVER ASSY)

 OR

ACCESS PANEL

332BTC (1900D)

(COVER ASSY)

SCREW

B

A

DETAILA

Inspection of Vertical Stabilizer Forward Spar Cap Angle and Hat Section for Cracks

Figure 2