Bulletin: Heating Systems

May 30, 2017
Alert Service Bulletin #071

Combustion Heater – P/N CD14048 or CD14048-1 Heater Pressure Decay Test Requirement

Affects all CD14048 and CD14048-1 Cabin Heaters installed in Piper PA-31-350 Chieftain aircraft.

April 4, 2016
Service Letter #059

Combustion Heater – Improved Cycling Switch Installation

Introduction of improved solid state cycling switches, P/N 81000 and 81001 to replace HET / Janitrol P/N 07D32 switch.

May 3, 2013
Service Bulletin #051

Replacement of P/N 69C13 Base in 65C30 Series Sealed Control Assembly.

August 22, 2012
Service Bulletin #A-101 Rev. G

Aircraft Heater Upgrade to I-Series. 

Affects HET / Janitrol B-Series heaters.  Provides upgrade instructions and installation eligibility for HET I-Series Heaters.

December 9, 2011
Service Information Letter #A-144

65C30 Series Sealed Control Solenoid Valve Clamp Replacement.

Installation instructions to replace P/N 10C67 Solenoid Valve Assembly with P/N 10C67-1.

March 27, 2008
Service Information Letter #A-129

Overheat Limit Switch Replacement – P/N ( )07D29 for Janitrol Aircraft Cabin Heaters.

February 9, 2007
Service Bulletin #025

Temporarily Disabling Janitrol B Series Aircraft Heaters (Supersedes Janitrol Aero SB 76).  Affects models B-1500, B-2030, B-2500, B-3040, B-3500, B-4050, and B-4500.

February 8, 2007
Service Bulletin #24

Welding of Combustion Tube in Janitrol B Series Aircraft Heaters (Supersedes Janitrol Aero SB73).  Affects Kelly Aerospace Power Systems models B-1500, B-2030, B-2500, B-3040, B-3500, B-4050, and B-4500.

January 31, 2007
Service Letter #023 B

Availability of Janitrol B Series Aircraft Heater Service & Overhaul Manuals P/N 24E25-1 & P/N 94E47. 

May 30, 2006
Service Information Letter #A-120

Improved Air Pressure Switch – 94E42.

December 20, 2004
Service Information Letter #A-110B

Recommended Service/Inspection for Model 91E93-1 & 91E92-1 Heater Fuel Pump.

March 21, 2003
Service Instruction #A-106 Rev. A

Recommended Time Between Overhaul (TBO) Period and Service Intervals for Extended Life (EL) Janitrol Heaters.
Affects Janitrol Heater Models B2500, B3500, and B4500.

Service Instruction #A-105 Rev. B

Documentation Procedure For Installation Of New Factory Rebuilt Janitrol Heaters.

January 6, 2003
Service Bulletin #A-108A

New Regulator Valve Approved for Use in Hartzell Engine Technologies B4050 & B4500 Series Heaters Installed in Piper PA-31-350.

September 6, 2002
Service Bulletin #A-107A

Inspection of Fuel Regulator Shutoff Valve as used with Kelly Aerospace Combustion Heaters, Models B-1500 through B-4500.

May 10, 2001
AD 2001-08-01 AMOC

Alternate Means of Compliance with AD 2001-08-01.

FAA Letter dated May 10, 2001 regarding SB A-107.

March 1, 2001
Service Bulletin #A-104 Rev. B

Janitrol B-Series Aircraft Heaters Combustion Air & Ventilation Air Blower Motors.

Part supersedure information.

October 1, 1998
Service Bulletin #A-103 Rev. A

Janitrol B-Series Aircraft Heaters – 42D36 Combustion Air Pressure Switch.
Supersedes SB #A-102.  Obsoletes P/N 42D36 replaced by P/N 94E42.