Summary of Contents for ACR Electronics COBHAM B406-4
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B406-4 EMERGENCY LOCATOR TRANSMITTER Abbreviated Component Maintenance Manual This manual includes data for the equipment that follows: Component Part No. Model No. Emergency Locator Transmitter 453-5004 B406-4 Wulfsberg Electronics Division 6400 Wilkinson Rd., Prescott, AZ 86301 Cage Code: 1B7G3 25-62-03...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) PROPRIETARY INFORMATION This document contains proprietary information and such information may not be disclosed to others for any purpose, nor used for manufacturing purposes without written permission from Wulfsberg Electronics.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SERVICE BULLETIN LIST SERVICE ISSUE MANUAL MANUAL SUBJECT BULLETIN NO DATE REV NO REV DATE 25-62-03 Page 5 of 86 APR 06/10...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) LIST OF EFFECTIVE PAGES SUBJECT PAGE DATE SUBJECT PAGE DATE Title Page Apr 06/10 Description and Operation Apr 06/10 Notices Apr 06/10 (cont.) Apr 06/10 Record of Revisions Apr 06/10...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBJECT PAGE DATE SUBJECT PAGE DATE Installation Apr 06/10 Appendix A Apr 06/10 (cont.) Apr 06/10 Apr 06/10 Apr 06/10 Illustrated Parts List Apr 06/10 Apr 06/10 Apr 06/10 Apr 06/10...
Installation Registration Illustrated Parts List In the United States, the B406-4 ELT must be installed and maintained in accordance with the requirements herein and 14 CFR, FAR Parts 43, and 91; and other airworthiness requirements, as applicable. In Canada, the B406-4 ELT must be installed and maintained in accordance with the requirements herein and Canadian Aviation Regulations (CAR), Part V, Paragraph 551.104 and...
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ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) B406-4 ELT installation and maintenance in all other countries must comply with the requirements herein and applicable national airworthiness requirements. The accessories (i.e., remote switch panel and antennas) addressed in this manual are the accessories most commonly associated with the B406-4 ELT.
2. Model Description SUBTASK 25-62-03-990-001 B406-4 The B406-4 is a type AF (Automatic Fixed) ELT, which transmits on 121.5, 243.0, and 406 MHz. The ELT is enclosed within a multi-piece mounting frame consisting of a mounting tray assembly, protective top cover assembly and mounting frame cap assembly.
B406-4 FAA TSO C126, Type AF NOTE: Details of TSO certification for the B406-4 ELT are available in the “B406-4 TSO Test Report” (572-0010). The conditions and tests required for TSO approval of this article are minimum performance standards. It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within TSO standards.
SUBTASK 25-62-03-990-002 Discussion The 406 MHz transmitter frequency of the B406-4 ELT was originally 406.025 MHz. In order to comply with COSPAS-SARSAT frequency allocation requirements, changes to the 406 MHz frequency may occur since the original release of this product.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-990-805 5. List of Acronyms, Abbreviations, and Definitions SUBTASK 25-62-03-990-001 Term Definition Advisory Circular – A Federal Aviation Administration (USA) bulletin with special information. For the purposes of this document, the acro- nym AC does not refer to electrical alternating current.
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) EUROCAE European Organization for Civil Aviation Equipment – EUROCAE docu- ments are widely referenced as a means of compliance to European Technical Standard Orders (ETSOs) and other regulatory documents. Federal Aviation Administration – The United States government agency for aircraft safety and regulation.
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Search and Rescue SCREEN ROOM The term “Screen Room”, within the context of this document, refers to a room designed to suppress RF signals, such that the broadcast of an ELT placed in the screen room cannot reach the SAR satellite sys- tem.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-990-806 6. References SUBTASK 25-62-03-990-001 Regulatory Documents The following regulatory documents are referred to herein. When referring to such documents, it is the manual user’s responsibility to ensure they are using the latest revision or release of such documents.
The following documents are available on-line at the Artex web site at www.artex.net, or from Wulfsberg Electronics upon request. 570-1000, “ELT Test Set (ETS) Operation Manual” 570-6501, “ELT/NAV Interface -B Abbreviated Component Maintenance Manual” 572-0010, “B406-4 TSO Test Report” 572-0043, “452-0133 - 406 Lithium Battery Pack TSO C142 Report” 25-62-03 Page 25 of 86...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) DESCRIPTION AND OPERATION TASK 25-62-03-870-801 1. Description SUBTASK 25-62-03-870-001 Functional Overview The ELT automatically activates during a crash and transmits the standard sweep tone on 121.5 and 243.0 MHz. Approximately every 50 seconds, for up to 520 milliseconds (long message protocol), the 406 MHz transmitter turns on.
SUBTASK 25-62-03-870-002 Components The B406-4 ELT main assembly is housed in a high impact, fire resistant, polycarbonate plastic case, which is enclosed in a protective mounting frame assembly made of similar material. See "Figure 1. B406-4 ELT and Mounting Frame Assembly".
Buzzer". Figure 3. Buzzer The battery pack for the B406-4 ELT consists of four “D” size lithium manganese dioxide cells connected in series. In an effort to increase the safety of the battery pack, a number of features were designed into the battery pack. To prevent the cells from being charged, diodes are connected across each cell and fuses are connected to the output.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Four dual-input antennas are approved for use with the B406-4 ELT. Selection of the proper antenna is dependent upon end use, aircraft configuration, speed, and other factors. See "Figure 5. Antennas".
See "Figure 6. ELT Operational Flow Diagram". A primary feature of the B406-4 ELT is its simplicity of operation. As long as the ELT is connected to the remote switch panel harness ELT connector, such that pins 5 and 8 are jumpered (G-switch loop), it will activate in the event of a crash.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) “ACTIVE” state requires a positive switch transition from either the cockpit remote switch, ELT local switch, or G-switch. NOTE: It is possible the G-switch could activate the ELT as the result of severe maneuvers or a very hard landing.
TASK 25-62-03-870-803 3. Specifications SUBTASK 25-62-03-870-001 Environmental and Physical Table 2 lists the environmental and physical specifications of the B406-4 ELT. NOTE: For automatic activation, the higher threshold of 4.5 ft/sec (2.3 ) is specified in accordance with Eurocae ED-62. Use of the higher threshold crash sensor has been approved by the FAA as a deviation to TSO C126 (FAA Reference #98-130S-108, February 6, 1998).
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TEST AND FAULT ISOLATION TASK 25-62-03-750-801 1. Inspection and Test Regulatory Requirements SUBTASK 25-62-03-990-001 United States In accordance with FAR Part 91, Subpart C, § 91.207 (d), the ELT must be inspected within 12 calendar months after the last inspection for: Proper installation;...
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-990-003 Other Countries For all other countries, maintenance and testing shall be conducted in accordance with the requirements of applicable national regulatory authorities and the requirements herein, as applicable. Local regulations and requirements shall take precedence.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-750-802 2. Inspection and Test Procedures SUBTASK 25-62-03-990-001 Checklist Table 5 provides a list of the ELT inspection and testing requirements, a copy of which may be used as a checklist to verify inspection and test completion. The item numbers in the table correspond to the item identifiers for each task.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-000-001 Preparation Remove the ELT in accordance with SUBTASK 25-62-03-010-001, on page 51. Remove the battery pack in accordance with SUBTASK 25-62-03-050-001, on page 52. SUBTASK 25-62-03-220-001 Coax Cables and Wiring Connections Inspection – Item 1 Check remote panel harness connector for corrosion bent or broken pins and other damage.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) When the total of all known transmissions exceeds one hour; or On or before battery replacement (expiration) date. SUBTASK 25-62-03-750-001 G-Switch Functional Check – Item 4 CAUTION: A JUMPER IS REQUIRED TO PERFORM THIS CHECK. DUE TO THE POTENTIAL OF PHYSICAL DAMAGE IF THE JUMPER IS IMPROPERLY INSTALLED, THIS STEP SHOULD ONLY BE PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Place the ELT in a container or screen room capable of substantially attenuating RF signals, or the transmitter power output shall be connected to a suitable dummy load to minimize radiation.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-750-005 121.5/243.0 MHz Power Output Measurement – Item 5c Connect the measuring device, referring to SUBTASK 25-62-03-750-002, on page 41. Activate the ELT, if necessary, by placing the control switch in the “ON” position.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-750-008 M. Current Draw Test – Item 5f CAUTION: EXERCISE EXTREME CAUTION TO AVOID CAUSING A SHORT CIRCUIT CONDITION, WHICH WILL BLOW THE FUSES IN THE BATTERY PACK. THIS TEST SHOULD ONLY BE PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Allow the ELT to stabilize for at least 30 seconds to avoid false readings. Read the current draw on the ammeter. Steady state current draw must not exceed 200 mA.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Repeat the activation and deactivation cycle if the ETS fails to read the message on the initial try. The 406 MHz oscillator may not be warmed up. If continued attempts to read the message fail, check for self-test error codes and refer to Table 6, on page 48.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-750-012 Antenna Test – Item 7 CAUTION: DO NOT ALLOW THE DURATION OF THIS TEST TO EXCEED 5 SECONDS. Tune a low quality AM receiver (i.e., radio) to 121.5 MHz.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-810-801 3. Troubleshooting SUBTASK 25-62-03-810-001 Self-Test Error Troubleshooting Guidelines Table 6 describes the ELT self-test LED error codes (i.e., flash codes), their probable causes, and possible solutions. The 5-flash error is not present when the ELT is programmed with a serial user protocol (short message).
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) CODE PROBABLE CAUSE POSSIBLE SOLUTION Battery low Low power output 3A fuse on battery pack circuit board faulty 3-Flash (cont.) Improper programming Verify 406 MHz programming Cannot be repaired in field - Return to...
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-050-801 2. Battery SUBTASK 25-62-03-050-001 Battery Pack Removal CAUTION: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD) COMPONENTS AND IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR A GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURING INSTALLATION ACTIVITIES.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-500-801 3. Material or Equipment Return SUBTASK 25-62-03-510-001 Shipment Information If any material or equipment is to be returned to the factory, under warranty or otherwise, Wulfsberg Electronics must be notified prior to shipment with the following information: •...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) INSTALLATION TASK 25-62-03-410-801 1. Regulatory Requirements and Guidelines SUBTASK 25-62-03-990-001 TSO C126, Paragraph D TSO approval of the ELT does not constitute installation approval. All ELT installations are subject to field approval for a given airframe by either an approved FAA DER or FAA FSDO.
STRUCTURAL INTEGRITY OF THESE COMPONENTS. THESE SAME CHEMICAL AGENTS MAY ALSO CAUSE CORROSION OF ELECTRICAL CONNECTIONS. Select a suitable location for the mounting tray. See "Figure 12. B406-4 ELT Outline and Dimensions". Refer to these dimensions when determining mounting location.
Mark the four holes needed for mounting the tray, using the tray as a pattern. The hole pattern is also illustrated in "Figure 12. B406-4 ELT Outline and Dimensions”, on page 57. Drill the four mounting holes with a #19 or 4.25 mm drill.
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Install the mounting tray with the 8-32 x 5/8” SS pan head phillips screws, flat washers, lock washers, and nuts provided in the installation kit (455-7421), as shown in "Figure 13. Typical Mounting Tray Installation".
SUBTASK 25-62-03-990-001 Selection Use only antennas approved for use with the B406-4 ELT. The ELT will not work properly without being connected to an antenna for which it was designed. Verify the antenna selected matches the requirements of the specific installation.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-450-803 4. Remote Switch Panel SUBTASK 25-62-03-450-001 Location NOTE: In most cases, panel space and wiring have been pre-provisioned by the aircraft manufacturer for the G737 control panel (remote switch panel assembly); however, location and installation requirements are defined for installations in aircraft not pre-provisioned for this remote switch panel.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-450-804 5. Buzzer SUBTASK 25-62-03-450-001 Location CAUTION: PLACING THE BUZZER IN THE COCKPIT IS NOT RECOMMENDED DUE TO THE POTENTIAL FOR DISTRACTION. THE BUZZER PRODUCES A LOUD, SIREN-TYPE SOUND WHEN THE ELT IS ACTIVATED. SINCE THE BUZZER OPERATES IN TANDEM WITH THE COCKPIT LED, IT WOULD ONLY SERVE AS A REDUNDANT WARNING INDICATOR IN THE COCKPIT.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-450-805 6. Wiring SUBTASK 25-62-03-990-001 General Considerations and Recommendations CAUTION: IF GROUND OR OTHER CONNECTIONS ARE BROKEN OR OTHERWISE DAMAGED, THE ELT IS STILL CAPABLE OF AUTOMATIC ACTIVATION; HOWEVER, THE COCKPIT REMOTE SWITCH MAY BE INCAPABLE OF RESETTING THE ELT AND OPERATION MAY NOT BE INDICATED ON THE REMOTE SWITCH LED.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) AIRCRAFT BATTERY +28VDC NOTE: IF HORN IS NOT USED, CONNECT YELLOW BLUE HORN REMOTE SWITCH CONTROL PANEL PIN 8 DIRECTLY TO ELT PIN 2. BLACK 2 ELT ON 1 LIGHT...
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COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Fabricate a 4-wire harness long enough to reach from the ELT to the cockpit remote switch panel, allowing enough slack to provide a drip loop at the ELT end and a service loop at the cockpit remote switch panel end.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) manufacturer’s written instructions or as described in AC 43.13-1, Chapter 11, § 9 through 12, as applicable. Terminate the aircraft side of the wires fabricated in Step (3) at the appropriate connection points in accordance with the aircraft manufacturer’s written instructions or AC 43.13-1, as...
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) NOTE: Prior to installing the 12-pin ELT receptacle onto the harness, the wires connecting to the ELT must be routed through the rectangular hole in the ELT mounting frame cap.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Ring out the wiring between the remote switch panel and the ELT, verifying proper continuity. Insert the buzzer wire (YELLOW) in Pin 2 of the receptacle. SUBTASK 25-62-03-450-004 Coax Cables Installation Route the two antenna coax cables through the airframe.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) (11) Secure the mounting frame cap to the mounting tray with the thumbscrews and tighten them to no more than 18 lb-in (203 N•cm). (12) Tie up excess slack in the harness and coax cables, such that they form drip loops and there is enough slack, approximately 5 in.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-410-002 Installation Documentation Make appropriate logbook (i.e., aircraft records) entries and submit FAA Form 337, along with any supporting data required by the FAA for approval of the installation, as applicable.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-450-806 8. Battery Pack Installation SUBTASK 25-62-03-450-001 Battery Reinstallation CAUTION: THE BATTERY PACK CONTAINS ELECTROSTATIC DISCHARGE SENSITIVE (ESD) COMPONENTS AND IT MUST BE HANDLED WITH CARE. IF POSSIBLE, WEAR A GROUNDED WRIST STRAP WHEN HANDLING THE BATTERY PACK DURING INSTALLATION ACTIVITIES.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Reset the ELT by toggling the ELT local control switch to “ON” and back to “OFF” after 1-2 seconds. NOTE: This step is necessary because the ELT will occasionally activate when power is connected to it in Step 6.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) SUBTASK 25-62-03-450-002 New Battery Installation CAUTION: DO NOT USE CONTACT CLEANER ON ELT COMPONENTS. SUCH CHEMICAL AGENTS CAN BE HIGHLY DESTRUCTIVE TO THE MOUNTING HARDWARE AND ELT HOUSING, CAUSING CRACKING, FRACTURING AND OTHER DAMAGE.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) APPENDIX A – ELT REGISTRATION TASK 25-62-03-990-801 1. Background Information SUBTASK 25-62-03-990-001 Hex ID Code Each 406 MHz ELT is programmed with a unique hex ID code (i.e., registration code) that is transmitted to the SAR satellite system.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-990-802 2. Registration SUBTASK 25-62-03-990-001 Responsibility It is the responsibility of the aircraft owner to register the ELT. If an ELT is moved to a different aircraft (i.e., an aircraft other than the one it was originally installed on), and/or the aircraft is registered in a new country, the ELT must be re-registered.
Purpose This illustrated parts list (IPL) illustrates and lists the spare parts, with attaching hardware, applicable to the B406-4 ELT. Parts and components not listed herein, are not field replaceable and ELT repairs requiring parts outside the scope of this manual must be accomplished by the manufacturer.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-990-802 2. Manufacturer Name and Address SUBTASK 25-62-03-990-001 Ordering Information Approved parts may be ordered from Wulfsberg Electronics, or any authorized dealer. CONTACT INFORMATION Sales, Wulfsberg Electronics 6400 Wilkinson Dr.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) TASK 25-62-03-990-803 3. Explanation of Detailed Parts List Entries SUBTASK 25-62-03-990-001 Fig # & Item Column The first number at the top of the column is the figure number of the corresponding illustration.
COBHAM AVIONICS WULFSBERG ELECTRONICS ABBREVIATED COMPONENT MAINTENANCE MANUAL B406-4 (453-5004) Assemblies, subassemblies, and detail parts subject to modification, deletion, addition, or replacement by an issued service bulletin, are annotated to indicate both pre- and post- service bulletin configurations. The term (PRE SB XXXX) in the “Nomenclature” column designates the original configuration, and the term (POST SB XXXX) identifies assemblies and parts after the modification has been completed.