Service Letters

May be mandatory or at the discretion of the operator. Service Letters give guidance and inspection criteria on known service conditions.

SL317A_RevNC
Temperature Control Electrical Circuit change
SL323_RevNC
Replacement of Hi-Output Blower Motor Support Bracket 206L4 & 407 series
SL325_RevNC
Installation of additional R/H forward evaporator in Bell 206 A/B helicopter
SL330_RevA
Forward Evaporator Air Outlet Louver Up-grade & Replacement Procedure 206 & 407
SL348_RevNC
Condenser Scoop Actuator Replacement Procedure 206, 407, & 427
SL-365_RevC
Air Conditioner Blower Motor Connector Upgrade
SL310_RevNC
Condenser Blower Motor Assembly change
SL304_RevNC
Air Conditioning System Performance Improvement Kit: 206L4 S/N 52118
SL311_RevC
Electrical Change (Prevent potential overload of existing power source)
SL313_RevA
Charging procedures change R134a
SL317_RevNC
Air conditioning system. Temperature Control electrical circuit change 206L4
SL316_RevA
Replacement of Forward Evaporator Blower Wheel & Motor Assy.

SL206-303_RevNC
Upgrade Kit - Bell 206 Cabin Heater Aft Heater Outlet Flow Control
SL305_RevNC
Upgrade Kit, Heater Ejector Installations
SL306_RevNC
Cabin Exhaust Vent Blower Modification 206BIII S/N 4324
SL328_RevA
Repair or Replacement of ES26185-1 (4712-7) Firewall shutoff valve
SL339_RevNC
Test procedures for ES26185-1 / -2 (4712-7) solenoid valves
SL341_RevNC
Modification of S-9266EC-30 Particle Separator bleed air port

SL313_RevA
System charging procedures change R134a
SL316_RevA
Replacement of Forward Evaporator Blower Wheel & Motor Assy.
SL323_RevNC
Replacement of Hi-Output Blower Motor Support Bracket
SL330_RevA
Forward Evaporator Air Outlet Louver Up-grade & Replacement Procedure 206 & 407
SL-366_RevC
Air Conditioner Blower Motor Connector Upgrade
SL348_RevNC
Condenser Scoop Actuator Replacement Procedure 206, 407, & 427
SL312_RevNC
Condenser Blower Motor Assembly change
SL314_RevA
Temperature Control electrical circuit change
SL343_RevNC
Modification to Bell 407 Air Conditioner Belt Tensioning Collar in conjunction with Bell Helicopter Technical Bulletin No. 407-02-35
SL349_RevNC
Inspection of the Bell 407 Air Conditioner Driveshaft Mounted Pulley and Drive Ring assembly
SL-329_RevB
Condenser Scoop Bellcrank Replacement & Adjustment Procedure

SL313_RevA
System charging procedures change R134a
SL328_RevA
Repair or Replacement of ES26185-1 (4712-7) Firewall shutoff valve
SL307_RevNC
Compressor Change
SL315_RevNC
Compressor Inspection Procedures
SL-374_RevC
Compressor Drive Pulley Belt Guard Change
SL318_RevNC
Inspection of Existing Air Conditioning System Condenser Assemblies
SL319_RevNC
Relocation of Air Conditioning System Charging/Service Parts
SL320_RevNC
Removal and Replacement of Air Conditioning System Compressor
SL324_RevNC
Replacement of AFT Evaporator Blower Wheel & Motor Assy.
SL326_RevNC
Inspection of 412AC-5040-3 Accumulator, when installed with Aeronautical Accessories Hoist Kit (P/N 412-150-400)
SL333_RevNC
Main Transmission Breather Vent Cap Relocation
SL334_RevH
Compressor/Compressor Mount Up-grade
SL336_RevNC
Hi/Lo Pressure Switch / Receiver Drier Schrader Valve Installation
SL-337_RevNC
Receiver Drier Upper Support Bracket
SL344_RevA
Compressor Speed Reducer Pulley and Bearing (Replacement of Al Idler Pulley by SS Pulley)
SL345_RevA
Compressor Speed Reducer Bearing Replacement
SL350_RevNC
Alternate compressor drive belt installation for the Bell 412CF air conditioner system

SL-363_Rev_1
Bell M429 Condenser Blower Motor Inspection and Possible Replacement
SL-429EC-9/2015_Rev_NC
Air Conditioning System Product Improvements

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