Service Letters
May be mandatory or at the discretion of the operator. Service Letters give guidance and inspection criteria on known service conditions.
AgustaWestland AW119 Air Conditioning
Air Conditioning
Airbus AS350 Air Conditioning
Airbus EC120 Air Conditioning
Airbus EC130 Air Conditioning
Airbus EC135 Air Conditioning
Airbus EC145 Air Conditioning
Bell 206 Air Conditioning
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SL-365_RevC
Air Conditioner Blower Motor Connector Upgrade
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SL310_RevNC
Condenser Blower Motor Assembly change
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SL304_RevNC
Air Conditioning System Performance Improvement Kit: 206L4 S/N 52118
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SL311_RevC
Electrical Change (Prevent potential overload of existing power source)
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SL313_RevA
Charging procedures change R134a
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SL317_RevNC
Air conditioning system. Temperature Control electrical circuit change 206L4
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SL316_RevA
Replacement of Forward Evaporator Blower Wheel & Motor Assy.
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SL317A_RevNC
Temperature Control Electrical Circuit change
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SL323_RevNC
Replacement of Hi-Output Blower Motor Support Bracket 206L4 & 407 series
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SL325_RevNC
Installation of additional R/H forward evaporator in Bell 206 A/B helicopter
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SL330_RevA
Forward Evaporator Air Outlet Louver Up-grade & Replacement Procedure 206 & 407
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SL348_RevNC
Condenser Scoop Actuator Replacement Procedure 206, 407, & 427
Bell 206 Heating System
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SL206-303_RevNC
Upgrade Kit - Bell 206 Cabin Heater Aft Heater Outlet Flow Control
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SL305_RevNC
Upgrade Kit, Heater Ejector Installations
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SL306_RevNC
Cabin Exhaust Vent Blower Modification 206BIII S/N 4324
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SL328_RevA
Repair or Replacement of ES26185-1 (4712-7) Firewall shutoff valve
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SL339_RevNC
Test procedures for ES26185-1 / -2 (4712-7) solenoid valves
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SL341_RevNC
Modification of S-9266EC-30 Particle Separator bleed air port
Bell 206 Hydraulic System
Bell 407 Air Conditioning
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SL313_RevA
System charging procedures change R134a
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SL316_RevA
Replacement of Forward Evaporator Blower Wheel & Motor Assy.
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SL323_RevNC
Replacement of Hi-Output Blower Motor Support Bracket
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SL330_RevA
Forward Evaporator Air Outlet Louver Up-grade & Replacement Procedure 206 & 407
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SL-366_RevC
Air Conditioner Blower Motor Connector Upgrade
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SL348_RevNC
Condenser Scoop Actuator Replacement Procedure 206, 407, & 427
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SL312_RevNC
Condenser Blower Motor Assembly change
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SL314_RevA
Temperature Control electrical circuit change
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SL343_RevNC
Modification to Bell 407 Air Conditioner Belt Tensioning Collar in conjunction with Bell Helicopter Technical Bulletin No. 407-02-35
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SL349_RevNC
Inspection of the Bell 407 Air Conditioner Driveshaft Mounted Pulley and Drive Ring assembly
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SL-329_RevB
Condenser Scoop Bellcrank Replacement & Adjustment Procedure
Bell 407 Heating System
Bell 412 Air Conditioning
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SL313_RevA
System charging procedures change R134a
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SL328_RevA
Repair or Replacement of ES26185-1 (4712-7) Firewall shutoff valve
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SL307_RevNC
Compressor Change
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SL315_RevNC
Compressor Inspection Procedures
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SL-374_RevC
Compressor Drive Pulley Belt Guard Change
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SL318_RevNC
Inspection of Existing Air Conditioning System Condenser Assemblies
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SL319_RevNC
Relocation of Air Conditioning System Charging/Service Parts
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SL320_RevNC
Removal and Replacement of Air Conditioning System Compressor
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SL324_RevNC
Replacement of AFT Evaporator Blower Wheel & Motor Assy.
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SL326_RevNC
Inspection of 412AC-5040-3 Accumulator, when installed with Aeronautical Accessories Hoist Kit (P/N 412-150-400)
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SL333_RevNC
Main Transmission Breather Vent Cap Relocation
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SL334_RevH
Compressor/Compressor Mount Up-grade
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SL336_RevNC
Hi/Lo Pressure Switch / Receiver Drier Schrader Valve Installation
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SL-337_RevNC
Receiver Drier Upper Support Bracket
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SL344_RevA
Compressor Speed Reducer Pulley and Bearing (Replacement of Al Idler Pulley by SS Pulley)
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SL345_RevA
Compressor Speed Reducer Bearing Replacement
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SL350_RevNC
Alternate compressor drive belt installation for the Bell 412CF air conditioner system
Bell 427 Air Conditioning
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SL-369_RevA
Air Conditioner Blower Motor Connector Upgrade
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SL329_RevB
Condenser Scoop Bellcrank Replacement & Adjustment Procedure
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SL348_RevNC
Condenser Scoop Actuator Replacement Procedure 206, 407, & 427
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SL335_RevA
Bell 427 Air Conditioner Compressor Drive Belt Replacement
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SL346_RevNC
Alternate Compressor Belt
Bell 427 Heating System
Bell 429 Air Conditioning
MD 900 Air Conditioning
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