412 Technical Bulletins


File Name
Date Posted
Description
  TB_412-17-240.pdf 24-May-17 HYDRAULIC SYSTEMS #1 AND #2 ACCUMULATOR P/N 212-076-007-003, REMOVAL OF
  TB_412-17-239.pdf 03-Apr-17 ADIU, DU, SOFTWARE UPGRADE TO SW 3.0 AND GTN 750 MAIN SOFTWARE UPGRADE TO VERSION 6.11
  TB_412-16-236_Rev_A.pdf 23-Feb-17 INTERMEDIATE GEARBOX OUTPUT QUILL COUPLING AND TAIL ROTOR COUPLINGS GREASE LEAK, PREVENTION OF
  TB_412-05-203.pdf 12-Dec-16 TAILBOOM BULKHEAD REINFORCEMENT
  TB_412-16-237.pdf 18-Nov-16 LCR 100 ATTITUDE HEADING REFERENCE SYSTEM (AHRS) MODIFICATION OF THE HEADING SYNCHRO OUTPUT
  TB_412-16-238.pdf 17-Nov-16 ENGINE FUEL FILTER DRAIN SYSTEM REDUCER 412-061-033-101, INTRODUCTION OF
  TB_412-15-234.pdf 12-May-16 HUB AND SLEEVE ASSEMBLY 412-010-401, CONFIGURATION CHANGE AND UPGRADE
  TB_412-16-235-RA.pdf 24-Mar-16 ADIU, DU, SOFTWARE UPGRADE TO SW 2.0 AND GTN 750 MAIN SOFTWARE UPGRADE TO VERSION 4.10
  TB_412-16-236.pdf 10-Feb-16 INTERMEDIATE GEARBOX OUTPUT QUILL COUPLING AND TAIL ROTOR COUPLINGS GREASE LEAK, PREVENTION OF
  TB_412-16-235.pdf 01-Feb-16 ADIU, DU, SOFTWARE UPGRADE TO SW 2.0 AND GTN 750 MAIN SOFTWARE UPGRADE TO VERSION 4.10
  TB_412-04-197-RB.pdf 05-Nov-15 INTAKE SCREEN IMPROVEMENTS
  TB_412-15-233.pdf 05-Jun-15 TAIL ROTOR GEARBOX INPUT QUILL LEAK, PREVENTION OF
  TB_412-14-232-RA.pdf 15-Dec-14 NEW TAIL ROTOR BLADE 412-016-100-111, INTRODUCTION.
  TB_412-14-232.pdf 04-Dec-14 NEW TAIL ROTOR BLADE 412-016-100-111, INTRODUCTION.
  TB_412-14-231.pdf 15-Aug-14 NEW MAIN ROTOR MAST 412-040-366-ALL ASSEMBLY, INTRODUCTION
  TB_412-13-230.pdf 29-Oct-13 COCKPIT VOICE RECORDER KIT, MODIFICATION
  TB_412-12-229.pdf 03-Jan-13 HYDRAULIC FLUID CONVERSION FROM MIL-PRF-5606 TO MIL-PRF-87257
  TB_412-12-228.pdf 09-May-12 TRANSMISSION UPGRADE
  TB_412-12-227.pdf 05-Apr-12 LATERAL FORCE GRADIENT ASSEMBLIES 212-001-034, CONFIGURATION CHANGE AND UPGRADE
  TB_412-12-226.pdf 05-Apr-12 FORE AND AFT FORCE GRADIENT ASSEMBLIES 212-001-035, CONFIGURATION CHANGE AND UPGRADE
  TB_412-11-INDEX.pdf 29-Feb-12 TECHNICAL BULLETIN INDEX
  TB_412-10-223-RA.pdf 15-Nov-11 FUEL TRANSFER IMPROVEMENT
  TB_412-01-177-RB.pdf 30-Aug-11 TAILBOOM ASSEMBLIES, P/N 212-030-100-111 / -121 / -133 / -147 / -159 / -177 / -191 / -203 AND -229, MODIFICATION FOR USE ON ALL MODEL 412 AND 412EP HELICOPTERS.
  TB_412-11-225.pdf 07-Apr-11 GENERATOR GROUNDING, IMPROVEMENT OF.
  TB_412-11-224.pdf 22-Mar-11 NUMBER ONE ENGINE JACKSHAFT SUPPORT INSPECTION AND MODIFICATION OF.
  TB_412-10-223.pdf 07-Oct-10 FUEL TRANSFER IMPROVEMENT
  TB_412-09-222.pdf 30-Nov-09 AFT CROSSTUBE ROCKING BEAM UPGRADE
  TB_412-09-220.pdf 18-Aug-09 TAIL ROTOR GEARBOX EXCLUDER HOUSING LEAK: PREVENTION OF
  TB_412-09-221.pdf 19-May-09 HOLES IN L/H MAIN BEAM WEB FOR USE WITH LEVELING JACKS, INTRODUCTION OF.
  TB_412-99-163_Rev._B.pdf 30-Apr-09 REVISION B TO TECHNICAL BULLETIN 412-99-163 ENGINE POWER SECTIONS, MIXING, AND USE OF.
  TB_412-99-165_Rev._A.pdf 30-Apr-09 FUEL PUMP LARGER DIAMETER DRAIN LINES, INTRODUCTION OF.
  TB_412-09-219.pdf 10-Feb-09 BELL HELICOPTER VIBRATION MONITOR (BHVM) KIT P/N 412-262-001/412-262-002412-262-003/412-262-004 WITH SMARTCYCLE + INTERFACE KIT INSTALLED IMPROVEMENT OF.
  TB_412-08-218.pdf 16-Jan-09 LINER P/N 412-040-102-103: INTRODUCTION OF
  TB_412-08-217.pdf 22-May-08 FUEL OVERFLOW DEFLECTOR UPGRADE
  TB_412-08-216.pdf 22-May-08 CARGO ARM SWITCH, REPLACEMENT AND REWIRE OF
  AAI TB AA-07126.pdf 01-Apr-08 BELL HELICOPTER VIBRATION MONITOR (BHVM) KIT
  TB_412-08-215.pdf 01-Apr-08 BELL HELICOPTER VIBRATION MONITOR (BHVM) KIT P/N 412-262-001/412-262-002/412-262-003/412-262-004 IMPROVEMENT OF
  TB_412-08-214.pdf 31-Mar-08 REPLACEMENT OF BLIND RIVETS ON TAILBOOM
  TB_412-08-213.pdf 14-Mar-08 UPPER CREW DOOR HINGE STRUCTURE, REINFORCEMENT OF
  TB_412-07-212.pdf 03-Jan-08 ARM AND BEARING ASSEMBLY ALTERNATE BOLT NAS6604H35, USE OF
  TB_412-05-203_Rev_A.pdf 03-Jan-08 TAILBOOM BULKHEAD REINFORCEMENT
  TB_412-06-205_Rev_A.pdf 16-Jul-07 REVISION "A" TO TECHNICAL BULLETIN 412-06-205: IMPROVED BAGGAGE COMPARTMENT DOOR SEAL
  TB_412-07-211.pdf 23-May-07 ATTITUDE AND HEADING REFERENCE SYSTEM (AHRS), MODIFICATION OF THE 26 VOLT AC WIRING
  TB_412-07-210.pdf 23-May-07 HYDRAULIC SYSTEM #1 FALSE WARNING INDICATION, PREVENTION OF
  TB_412-07-209.pdf 11-Apr-07 POWER SECTION CASE DRAIN FITTING STANDARDIZATION
  TB_412-06-208.pdf 08-Nov-06 CENTER ENGINE DECK MODIFICATION FOR USE ON OTHER AIRCRAFT
  TB_412-06-207.pdf 04-Aug-06 VERTICAL FIN COVER HINGE PIN IMPROVED INSTALLATION
  TB 412-06-206.pdf 15-Jun-06 INSTALLATION OF MISSING RIGGING RIVETS
  TB_412-06-204.pdf 03-Apr-06 IMPROVED MAST TORQUE SIGNAL CONDITIONER, INTRODUCTION OF
  TB_412-88-66_Rev_A.pdf 11-Oct-05 MAIN BEAM CAP 205-030-186-005 INSPECTION & REPLACEMENT WITH MAIN BEAM CAP 205-030-186-101
  TB_412-05-202.pdf 29-Aug-05 AFT TOP COWLING REINFORCEMENT
  TB_412-98-150_Rev_A.pdf 25-Jul-05 INTRODUCTION OF PROCEDURES FOR ELIMINATION OF MAST SEAL LEAKS
  TB 412-05-201.pdf 23-May-05 BEARING AND LINER ASSEMBLIES P/N 204-010-433-001 AND P/N 204-011-443-001: INSTALLATION IMPROVEMENTS
  TB 412-04-200.pdf 29-Oct-04 SIMPLE PENDULUM ABSORBER ADDITIONAL WASHER, INTRODUCTION OF
  TB 412-04-199.pdf 29-Oct-04 NEW CHIP DETECTOR INTERFACE PROBLEM WITH MASTER CAUTION PANEL
  TB 412-04-198.pdf 12-Jul-04 TRANSMISSION OIL PUMP 212-040-184-001, MODIFICATION OF
  TB 412-92-103 Rev A.pdf 28-Jun-04 USE OF ALTERNATE MAIN ROTOR BLADE BOLT IN LIEU OF EXPANDABLE MAIN ROTOR BLADE BOLT
  TB412-04-197.pdf 28-Jun-04 INTAKE SCREEN IMPROVEMENTS
  TB 412-04-196.pdf 05-Apr-04 OIL DRAIN VALVE P/N 209-062-010-001, POWERPLANT ACCESSORY GEARBOX, IMPROVED SECURITY OF SCREWS
  TB 412-03-195.pdf 09-Sep-03 TRANSMISSION OIL FILTER ASSEMBLY P/N 204-040-760-113: INTRODUCTION OF.
  TB 412-00-166 Rev A.pdf 23-Jun-03 REVISION "A" TO TECHNICAL BULLETIN 412-00-166: PILOT AND COPILOT COLLECTIVE STICK #1 THROTTLE GRIP, MODIFICATION OF
  TB 412-03-194.pdf 19-Jun-03 FLANGE ADAPTER P/N 412-040-634-101 AND 412-040-625-101, ELIMINATION OF RETIREMENT LIFE.
  TB 412-03-190 Rev A .pdf 12-Jun-03 REVISION A TO TECHNICAL BULLETIN 412-03-190: MAIN ROTOR HUB ASSEMBLY 412-010-100-ALL, MODIFICATION OF HARDWARE AND INSTALLATION PROCEDURE.
  TB 412-03-188 Rev A.pdf 03-Jun-03 REVISION "A" TO TECHNICAL BULLETIN 412-03-188: (REPLACEMENT OF LANDING LIGHT MECHANICAL RELAY ASSEMBLY WITH A SOLID-STATE SWITCH MOUNTED ON A PRINTED WIRING BOARD.
  TB 412-03-189.pdf 06-May-03 HUB AND SLEEVE ASSY. ELIMINATION OF PREMATURE WEAR TO DRIVE LINK 412-010-405-107/-109 AND HUB ASSY. 412-010-445-101
  TB 412-03-192.pdf 14-Apr-03 LOWER NOSE DOORS P/N 212-030-217-011 & 212-030-205-001 AND SEAL REPLACEMENT
  TB 412-03-193.pdf 14-Apr-03 TAILBOOM FIN STIFFENER MODIFICATION
  TB 412-03-191.pdf 25-Mar-03 MAIN ROTOR BRAKE QUILL, 412-040-123-101 TO 412-540-014-101 MODIFICATION OF,
  TB 412-03-187 .pdf 25-Feb-03 MAIN BEAM LANDING GEAR SUPPORT MODIFICATION
  TB 412-02-185.pdf 18-Feb-03 HYDRAULIC LINE INSTALLATION, IMPROVEMENT OF.
  TB 412-02-183.pdf 17-Jan-03 MAIN TRANSMISSION ASSEMBLY, P/N 412-040-004-103, CONFIGURATION CHANGE AND UPGRADE TO P/N 412-040-004-109
  TB 412-02-184.pdf 17-Jan-03 TRANSMISSION DEBRIS COLLECTOR ASSEMBLY P/N 212-040-146-001 TO -101FM, MODIFICATION OF.
  TB 412-02-186.pdf 10-Jan-03 TRANSMISSION OIL COOLER LINES P/N 412-040-243-101 & 412-040-244-101, INTRODUCTION OF
  TB 412-02-182.pdf 29-May-02 MAIN ROTOR BLADES IMPROVED EROSION SHIELD P/N 412-015-304-105, INTRODUCTION OF
  TB 412-02-181.pdf 24-May-02 TAIL ROTOR GEARBOX ASSEMBLY 212-040-004-009, MODIFICATION TO -103 CONFIGURATION
  TB 412-01-180.pdf 19-Dec-01 DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEM RESPONSE ON THE YAW AXIS, IMPROVEMENT OF.
  TB 412-01-179.pdf 20-Nov-01 MAIN ROTOR MAST 412-040-366-109 UPGRADE TO A -111 CONFIGURATION
  TB 412-01-178.pdf 19-Nov-01 IMPROVED ENGINE TORQUE TRANSMITTING SYSTEM BENZ MODEL 800-0001 INTRODUCTION OF
  TB 412-00-170.pdf 26-Jul-01 CYCLIC AND COLLECTIVE JACKSHAFT, INSPECTION AND MODIFICATION OF
  TB 412-01-176.pdf 15-May-01 412 CATEGORY "A" N2 RIGGING PROCEDURE, INTRODUCTION OF.
  TB 412-01-175.pdf 26-Apr-01 ENGINE POWER TURBINE GOVENOR LEVER RE-INDEXING, INTRODUCTION OF
  TB 412-01-174.pdf 21-Feb-01 ALIGNMENT: ENGINE TO TRANSMISSION
  TB 412-01-173.pdf 01-Feb-01 IMPROVED TAIL ROTOR PITCH LINKS
  TB 412-00-172.pdf 29-Sep-00 MAIN DRIVESHAFT, A) CONVERSION FROM 212-040-005-103 TO 412-040-005 103. B) UPGRADING MAIN DRIVESHAFT 412-040-005-101 TO 412-040-005-103.
  TB412-00-171.pdf 31-Aug-00 FORWARD CROSSTUBE, MODIFICATION OF
  TB 412-00-169.pdf 24-May-00 FORWARD XMSN FAIRING HINGE ASSY; REMOVAL OF
  TB 412-00-168.pdf 24-May-00 IMPROVED MAIN ROTOR SPINDLE & DAMPER BEARING
  TB 412-00-167.pdf 01-Mar-00 ELEVATOR CONTROL TUBE P/N 412-001-909-101 MODIFICATION


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