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DataBases updated: Mar 5th, 2026
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Service Bulletins
NameRevisionLangSubjectDate
en Cockpit Display Box Modification
en Replacement of TEEL Pump4/3/1989
en Relay Box Conversion to Prevent Damage of the Electric Actuator4/7/1998
en Incorrect Weight and Balance Statement9/4/1990
en Alert R44lll Spray System Honda Pump Fitting Inspection3/28/2017
en Rewire to Precluded Relay Contact Arcing
en Safety Issue Concerning P/N 5595: Do Not Use10/7/1998
en Teflon Spacers P/N 5749 Used in Seal Kit Boom Valve. Spacers Tolerance too Tight5/21/1998
B en Boom Valve Replacement Retro Fit Kit12/12/1994
en Boom Valve Replacement Retro Fit Kit9/23/1994
en Control Valve Maintenance Bulletin12/12/1997
en Converts Boom Valve 5990 to 5990-020
en Replace 5990 or 4670 with 5990-020 Boom Valve Replacement Kit 5990-026
en Replace 5990 or 4670 with 5990-020 Boom Valve Replacement Kit 5990-027
B en Boom Valve Conversion Kit 5990-030 Replace 5990-24 Power Head with 5990-030 Power Head
en Rewire to Preclude Relay Contact Arcing
en Electrical Control System Use and Indicator Box Replacement by Fuse Adapter
en Aluminum Brackets are Subject to Failure Under Higher Speeds5/15/2001
A en Replace Spacers with Mounting Brackets9/16/1998
en Modification of Hydraulic Power Unit5/12/1998
en Steps to Secure the Nut on the Main Support that Secures the Main Tank to Helicopter5/15/1998
en Modifying the Power Unit6/22/1998
en Allow a Shear Breakaway and Clearance for Hover Refill Pump Assembly to Swivel Past Manifold7/2/1998
A en Describes Steps for the Installation of 2 Pressure Reliefs at the Aft Actuators8/21/1998
en Describes Steps for Modifying the Filter on a 10900 or 10900-050 Fire Attack System7/7/1998
en Describes Steps for a Trail Switch Upgrade on Both the 10900 and 10900-050 Systems7/8/1998
en Describes Steps for Applying Grease to Door Seals7/8/1998
en Describes Steps for a Dual Switch Box Assembly Installation for Both Models7/10/1998
B en Steps for a Flow Restriction Installation for Both Models10/7/1998
en Evaluation of Foam Pump P/N Needs to be Relocated to Prevent Leaking Pump Shaft Seal11/23/1999
en Modification to Box in Order to Decrease the Arcing of Relay Contacts
A en Modification is to Improve and Standardize Operation and Durability
en Hydraulic Quick Disconnect Assembly6/29/1999
en Relay Box Main Power Stud Replacement5/21/2004
en Adding Hover Pumps with an Improved Wear Resistant Sleeving8/15/2002
en Cable Attached Between the Pump Assembly and the Tank Not Required6/25/1999
B en Threaded Rod Assemblies3/29/2004
en Adding Hover Pumps with an Improved Wear Resistant Sleeving8/15/2002
A en Determined that Plugging Foam Injection Lines in Tank will Allow System to be Flown
en Regarding Use of Thread Locking Material for the Bolts on Hub10/1/2002
en Older 10901-13 Relay/Starter Box Assemblies10/10/2002
en Older 10996-006 Relay/Starter Box Assemblies10/4/2002
en Determined that to Help Retain the Actuator Key in Keyway, Actuator Should be Adhered to Keyway10/4/2002
en Anodized Tank Vents6/24/2004
en Tie-Down Assembly with Increased Length Bolt6/24/2004
en Hover Pump Elbow Set Bolt Addition6/24/2004
en Foam Tank Foam Pump Wire Harness Plug6/25/2004
en Addition on Hose Clamp Keeper on Spray Boom6/24/2004
en S/Ns 1088, 1089, 1090 Only7/29/2003
en Hover Pump Screen Updated Design
en New Patch Plug Allows System to Continue Operating in Case of Computer Malfunction8/7/2002
en Modification to Increase Boom Valve Suck Back Performance3/8/2000
en Addition of in-Line Fuse to Spray Pump Harness4/19/2004
en Minimal Clearance Issue Regarding Aircraft Probe4/1/2003
en Lock Tite Applied to Threads of Bolts in Place of Safety Wiring Bolts10/1/2002
C en Modification to Insure Proper Water Seal for Hover Refill Pump Motor10/21/1999
en Decrease Current Draw on Hover Pump
en Output Shaft Seal Valve
en Modification to Insure Proper Water Seal for Hover Refill Pump Motor9/29/2000
en Need to Upgrade Seal Sleeve and Impeller Used in Assembly to Meet with QC Standards6/9/1999
en Available Modification to Allow Independent Operation of Left and Right Doors10/15/2002
en Addresses Relay Box Design and Proposes Substitution Solution9/6/2002
en Hover Pump Bypass Plug on the Hover Pump Connector J4A when the Hover Pump is Not Installed which Corrects this Erroneous Indication11/6/2003
en Improved Tank Hardpoints and Struts7/12/2004
en Installation of Revised Shroud Using Mounting Studs Instead of Link Locks4/1/2004
en Minimal Clearance Issue Regarding Aircraft Probe4/1/2003
en Regarding Improvement of Forward Attachment Internal Structure5/22/2005
B en Due to Manufacturing Changes Over Time, there May be Configurations in Field that have Less than Adequate Bolt Edge Margin in Hidden Structure of Forward Attachment Hard Point Installations4/5/2004
A en Regarding Improvement of Forward Attachment Internal Structure5/22/2002
A en Regarding Hardpoint Attaching Hardware & Internal Baffle Interference
en Adding Additional Support Posts to Forward Shroud Attachment2/25/2003
en Adding Additional Support Posts to Forward Shroud Attachment2/25/2003
en Use of Eurocopter AS350 Series Fixed Landing Lights2/16/2004
A en Installation of Revised Shroud with Provisions for Fixed Landing Lights4/19/2004
en Relocation of Wiring to Clear Landing Light1/9/2004
en Installation of Low Profile Hydraulic Fittings & Hoses12/23/2003
A en Installation of Rotational Limiting Device on Hover Pump Elbow12/23/2003
en Regarding Installation of Water Sight Gauge to Monitor Tank Water Level9/13/2002
en Structural Discrepancies in the Construction of the First Three 314 Fire Attack System9/5/2003
en Structural Discrepancies in the Construction of the 314 Fire Attack System Serial Numbers 001, 002 and 0035/14/2003
B en Installation of Water Payload Display and Continuous Water Level Readouts4/15/2005
en Replacement of Vne Placard
en Hover Pump Elbow Access Hatch5/12/2004
en Mandatory Modification of Hard Point to Eyebolt Clearance by Injection of Epoxy Filler Material4/22/2004
A en Installation of Flanged Hover Refill Pump Elbow5/10/2004
A en Modification of Sluiceway, Installation of Check Valves and Installation of New PLC Software to Meet IAB Certification4/12/2004
en Improved Cockpit Display Box
en Regarding Safety Risk of Electrical Shock During Operation of Electrical Hover Pump4/18/2003
B en Tank Structure at Ground Handling Wheels Prone to Failure if Wheels Overextended6/3/2002
en Tank Shell Daily Inspection
en Reduce Water Volume and Improve Drop Pattern8/7/2003
en Regarding Replacement Procedures of Existing Electric Control System, Hydraulic Power Unit7/7/2003
en Reconfigured Mirror Design
Service Letters
NameRevisionLangSubjectDate
en Alteration of Tank Level Sensor Connection5/20/2005
en Installation of Shims on Attachment Fittings6/20/2005
B en Installation of Modified Tank Top Skin Inserts7/11/2005
en Modification of Tank Hardpoints and Struts12/28/2005
en Installation of 323 Lower Shroud Brackets3/14/2006
en Installation of 323-001 Dual "L" Foam Bags3/14/2006
en Installation of a Vacuum Breaker Valve11/13/2006
en Hydraulic Back Pressure Repair1/22/2007
A en Modification of Tank Hardpoints and Struts3/20/2007
en Installation of Vacuum Breaker Valve in Hover Refill Elbow6/16/2007
F en Replacement of 10953-009 Threaded Rod Assembly & 10954 Threaded End8/6/2008
F en Replacement of 10953-001 Threaded Rod Assembly8/6/2008
F en Replacement of 10953-002 Threaded Rod Assembly & 10954 Threaded End8/6/2008
F en Replacement of 10953-005 Threaded Rod Assembly8/6/2008
en Installation of Modified Tank Top Skin Inserts4/2/2008
en Modification of the Location of Tank Attachment Fittings3/24/2008
en Modification of the Door Actuator and Shaft Assembly4/14/2008
en Composite Repair on 301 Tank Structure for Actuator Mount Attachment Holes11/11/2008
en Labeling of Fire Attack System Circuit Breakers2/11/2009
en Periodic Servicing Recommendations3/5/2009
en Installing Neble Plug Clearance Cup4/27/2009
en Repairing Mack Javelin Turret Lock Handle5/18/2009
en Shroud Modification6/4/2009
en Installation of Relay Cover8/13/2009
en Cockpit Display Box Door Position LED9/8/2009
en Installation of Overflow Shroud10/15/2009
en Installation of Overflow Shroud10/15/2009
en Wiring Harness Repair12/15/2009
en Dispersal Door Overhaul3/17/2010
en Tank Attachment Inspection3/17/2010
A en Dispersal Door Overhaul8/4/2010
A en DC Electric Hover Refill Pump Recommended Maintenance Schedule8/4/2010
en DC Electric Hover Refill Pump Recommended Maintenance Schedule3/17/2010
A en AC Electric Hover Refill Pump Recommended Maintenance Schedule8/9/2010
en AC Electric Hover Refill Pump Recommended Maintenance Schedule3/17/2010
en AC Electric Hover Refill Pump Recommended Maintenance Schedule3/17/2010
en Hydraulic Hover Refill Pump Recommended Maintenance Schedule3/17/2010
en Tank Attachment Inspection3/17/2010
A en Tank Attachment inspection8/9/2010
A en Tank Attachment inspection8/4/2010
en Tank Vibration Dampening1/26/2010
en Hover Pump Bumper Replacement3/23/2010
en Hydraulic Back Pressure Repair4/28/2010
en Spray System Engine Wiring Harness Modification6/25/2010
en Spray System Boom Valve Control Head Adapter Update6/29/2010
B en Replacement of Fasteners in Turret Assembly9/10/2012
B en R44III Spray System Honda Pump Fitting Replacement3/14/2018
en R44III Spray System Honda Pump Outlet Cover Installation3/12/2018
Miscellaneous
NameRevisionLangSubjectDate
en Engineering Letter: Composite Inspection and Repair Procedures for 301 Hard Point Area as Identified by Santoku Aviation11/2/2009