Service Letters

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

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.
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

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

SL-329_RevB
Condenser Scoop Bellcrank Replacement & Adjustment Procedure
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

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
SL318_RevNC
Inspection of Existing Air Conditioning System Condenser Assemblies
SL-374_RevC
Compressor Drive Pulley Belt Guard Change
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

Under our roof we have decades of engineering, manufacturing, and service experience. Our people are simply the best in the business.

AirComm personnel have traveled worldwide assisting and supporting our customers - often at a moments’ notice.