Service Bulletins

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• Cabin Heaters
• Electrical Accessories
• Fuel & Filtration
• Turbocharging Systems

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Cabin Heaters

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• Service Information Letter #A-144
  Date: December 9, 2011
  Subject: Provides instruction to permit use of an updated P/N 10C67-1 Solenoid Valve Assembly in 65C30 Series Sealed Control Units by removing the existing clamp and installing a new clamp assembly which fits the new Solenoid Valve Assembly. P/N 10C67 is no longer available but existing new or serviceable units may continue to be used with the original clamp arrangement. This SIL does not require change of a properly operating Solenoid Valve Assembly.

• Service Information Letter #A-129
  Date: March 27, 2008
  Subject: This Service Information Letter provides identification criteria and announces the change and availability of a replacement Overheat Limit switch for the continued support and maintenance of Hartzell Engine Technologies (Janitrol) B Series aircraft cabin heaters.

• Service Information Letter #A-128 Rev. B
  Date: February 4, 2010
  Subject: Hartzell Engine Technologies, LLC is pleased to announce that Revision C of the 94E47 B Series heater overhaul manual is now available. This revision corrects minor errors and changes in the application, testing and IPL sections of the manual.

• Service Information Letter #A-127 Rev. C
  Date: February 28, 2012
  Subject: Hartzell Engine Technologies is pleased to announce that Revision D of the 24E25-1 B Series heater overhaul manual is now available. This revision corrects minor errors, removal of application section, changes in name and Logo is various sections of the manual.

• Service Bulletin #025
  Date: February 9, 2007
  Subject: This Service Bulletin supercedes the old Midland Ross (JAD) SB 76 regarding the option of disabling B Series aircraft heaters in lieu of repair or replacement. This new bulletin states disabling as a temporary option which must be remedied within 24 months.

• Service Bulletin #24
  Date: February 8, 2007
  Subject: This Service Bulletin supercedes the old Midland Ross (JAD) SB 73 regarding the welding of B Series aircraft heater combustion air tubes. This new bulletin continues to prohibit any repair by welding.

• Service Letter #023 B
  Date: Jan 31, 2007
  Subject: This Service Letter announces the availability of B Series Aircraft Heater Overhaul and Service manuals. P/N 24E25-1 has been expanded and reissued for standard tube heaters and P/N 94E47 has been issued for extended life tube heaters. The new manuals now contain an IPC.

• Service Bulletin #A-101 Rev. F
  Date: July 12, 2006
  Subject: B-Series Janitrol Heaters - Supersedure Data
  Aircraft installations using JANITROL B-SERIES HEATERS have undergone certain product improvements that are available to users in order to upgrade the performance of their Combustion Heaters. This Service Letter is to advise users of those improvements and recommend upgrade of their particular Heater at the next required Major Overhaul. The purpose of this Letter is to reduce field problems with older technology Heaters through supercedure to later, improved designs.

• Service Bulletin #A-102
  Date: September 1994
  Subject: Janitrol B-Series Aircraft Heaters - 42D36 Combustion Air Pressure Switch
  Aircraft installations of B-Series Heaters (B1500, B2030, B3040, B4050) have experienced field failures of the 42D36 Combustion Air (C/A) Pressure Switch due to over adjustment and consequent de-coupling of the pressure sensing spring. Bulletin requires users to check and adjust their C/A switch by the proper procedure.

• Service Bulletin #A-103 Rev. A
  Date: February 1998
  Subject: B-Series Heaters - Replacement of 42D36 Switch Series
  New Switch (P/N 94E42) upgrade recommendation. FAA AD-NOTE #96-20-07

• Service Bulletin #A-104 Rev. B
  Date: March 2001
  Subject: B-Series Heaters - Supersedure Data
  Combustion Air & Ventilation Air Blower Motors

• Service Instruction #A-105 Rev. B
  Date: March 21, 2003
  Subject: Factory Rebuilt Janitrol Heaters
  Document Procedure For Installation of New Factory Rebuilt Janitrol Heaters

• Service Instruction #A-106 Rev. A
  Date: March 21, 2003
  Subject: Recommended Time Between Overhaul (TBO) Period and Service Intervals for Extended Life (EL) Janitrol Heaters.
  Models B2500, B3500, and B4500

• Service Bulletin #A-107A
  Date: September 6, 2002
  Subject: Inspection of Fuel Regulator Shutoff Valve as Used With Kelly Aerospace Devices Combustion Heaters, Models B1500-B4500
  This revision of Kelly Aerospace Service Bulletin No A-107 incorporates modifications to the pressure test procedure described in Sections 3 and 4. Recurrent inspection requirements are added to Section 7. A dark highlight bar in the left-hand margin denotes change locations.
  
  Alternate Means of Compliance for AD 2001-08-01 FAA Letter dated May 10, 2001*
  AD2004-25-16R1 Eliminates the requirement to re-stamp the regulator body with a date of inspection code as found in step 6 of SB A-107A Airworthiness Directive 2004-25-16 R1*

• Service Bulletin #A-108A
  Date: January 6, 2003
  Subject: New Regulator Valve Approved for Use in Hartzell Engine Technologies B4050 & B4500 Series Heaters Installed in Piper PA-31-350.

• Service Information Letter #A-110B
  Date: December 20, 2004
  Subject: Recommended Service/Inspection for Model 91E93-1 & 91E92-1 Heater.
  In response to recent complaints of leakage on dual fuel pump installations outside of the original SIL A-110A timeframe. Kelly Aerospace, Inc. recommends an inspection of all model 91E93-1 (12 volt) and 91E92-1 (24-volt) aircraft heater fuel pumps.

• Service Information Letter #A-120
  Date: May 30, 2006
  Subject: Improved Air Pressure Switch - 94E42.
  Kelly Aerospace Power Systems is pleased to announce the availability of an improved air pressure switch which will improve the reliability of cabin heater operation.
  

Electrical Accessories

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• Service Bulletin #044
  Date: November 7, 2011
  Subject: A non-conforming bearing wave retainer clip was used in the production of alternator Drive End Housing (DE) assemblies on the affected alternators. The bearing wave retainer clip may allow the DE bearing outer race to rotate in the housing. It is possible that wear due to a rotating bearing race may lead to alternator malfunction which may result in engine damage.

• Service Bulletin #043
  Date: November 2, 2011
  Subject: This Service Bulletin requires that use of X-Drive starters on Partenavia and Vulcanair P68 series aircraft should be discontinued. Hartzell Engine Technologies advises that the above applications using the SRB-9021 X-Drive starter may experience airframe interference including contact with the engine oil cooler not evident at initial starter installation but occurring after start or upon application of engine torque.

• Service Letter #040
  Date: October 6, 2011
  Subject: Service Letter SL 040 restricts the use of HET magneto bearing P/N ES10-353056 in TCM/Bendix Series S1200, D2000, and D3000 pressurized magnetos. To further clarify bearing usage, the Service Letter also authorizes the continued use of this bearing in non-pressurized magnetos.

• Service Information Letter #A-141
  Date: April 1, 2011
  Subject: Direct drive starter motor torque & drive shaft tolerance. This SIL is being issued to provide service information for checking the starter drive shaft tolerances prior to installation of the starter and to supplement the current OE-A2 Alternator and Starter Overhaul and Maintenance Manual until a revision can be made to add the technical instructions.

• Service Information Letter #A-140
  Date: March 11, 2011
  Subject: This Service Information Letter is being issued to remind installer's of new, rebuilt, or overhauled gear driven alternators procured from HET for aircraft engines, that all shipping hardware must be removed and discarded prior to installation of the alternator drive coupling.

• Service Letter #038
  Date: October 1, 2010
  Subject: This service letter provides a technical discussion for purchasers or installers of the HET lightweight M-Drive starter and the effect of using it with an existing TCM starter adapter.

• Service Bulletin #038 Rev. A
  Date: September 24, 2009
  Subject: Service Bulletin SB 038 Rev A is being issued to correct the date from 2008 to 2009 current date. The original issuance mandated the inspection for cracks in a specific area of the ES10024-1 alternator. If found in the serial numbers listed in the publication, replace the existing ES10024-1 (TCM P/N 656802) alternator.

• Service Information Letter #A-132
  Date: March 12, 2009
  Subject: This Service Information Letter is intended to provide information and guidance as to the installation and normal operation of Hartzell Engine Technologies E-Drive and X-Drive starters used on aircraft or rotorcraft.

• Service Bulletin #033
  Date: July 11, 2008
  Subject: This Service Bulletin is being issued to mandate the replacement of both the fan and pulley assemblies on the existing ES7024-11 (TCM 656872) & ES7024-14 (TCM 657199) alternators and to announce the availability of an improved pulley assembly which when installed will remedy a cracked fan condition.

• Service Letter #25
  Date: February 12, 2008
  Subject: This service letter announces the supercedure of certain Hartzell Engine Technologies Magnaflite series starters with new E & X Drive series aircraft starters.

• Service Information Letter #A-126
  Date: November 16, 2007
  Subject: This SIL (Service Information Letter) provides recommended methods for establishing eligibility when installing current or new Kelly Aerospace Inc. starters should the FAA 8130-3 be marked NA in the eligibility block.

• Service Information Letter #A-125 Rev. A
  Date: February 6, 2008
  Subject: This Service Information Letter entails terminal connection instructions for the ES-6000 & ES-7000 series alternator. (revises torque call out in step 4 and instructions in step 9)

• Service Information Letter #A-122 OE-A2 Rev. 4
  Date: November 15, 2010
  Subject: An update and revision of the OE-A2 Overhaul and Maintenance Manual for Aircraft Alternator and Starters has been completed and is now available. Any registered owner of an OE-A2 Overhaul Manual with a valid serial number may purchase this revision.

• Service Bulletin #016 Rev. A
  Date: April 28, 2003
  Subject: Notifcation of Part Number Supersedure for Factory New Alternators Incorporating Improved Slip Ring End Bearing
  Factory new alernators incorporating an improved slip ring end bearing are available for ALE, ALT, ALU, ALX, ALY, ALZ, ANG Series, ES-4032, and ES-4039 Model Alternators.

• Service Bulletin #017 Rev. A
  Date: April 28, 2003
  Subject: Replacement of Slip Ring End Bearing
  Service experience has indicated the roller element bearing used in the slip ring end of the ALE, ALT, ALU, ALX, ALY, ALZ, ANG series, ES-4032, and ES-4039 alternators may be subject to excessive wear which could result in loss of alternator performance.

• Service Bulletin #018 Rev. A
  Date: April 28, 2003
  Subject: Part Number Supersedure For Electrosystems Alternators
  Factory New ALE, ALT, ALU, ALX, ALY, ALZ, ANG Series, ES-4032, and ES-4039 Model Alternators Effected.

• Service Information Letter #0101
  Date: October 5, 2001
  Subject: VR286, VR288 & VR710A Paralleling Procedure
  This Service Instruction provides information for installation of alternators in parallel.

• Service Bulletin #A-112 Rev. A
  Date: November 24, 2003
  Subject: Hartzell Engine Technologies is initiating a recall of the following Starters due to potential failure of the drive gear assembly. Customers owning starters affected by this Service Bulletin may also experience actuation difficulties with the starter's bendix drive assembly. This could include failure of the bendix to properly retract after engine start or failure of the bendix to properly extend at the beginning of the starting cycle. Either condition may result in damage to the starter or the engine fly wheel. The bendix assembly cannot be field repaired. The starter bendix should be replaced with a factory reconditioned or factory new unit.
  
  MODELS AFFECTED: MHB-6014, -6014R, -6016, -6016R, -6018, -6018R; MMU-6001; MZ-6204, -6220, -6220R, -6222, -6222R, -6224, -6226 Starters. Only those assemblies itemized in this Bulletin are subject to this recall.

• Service Bulletin #021
  Date: February 26, 2004
  Subject: 1) Notification of the applicability of the Kelly Aerospace OE-A2 Starter and Alternator Overhaul Manual. 2) Notification that the OE-A1 Overhaul Manual is superceded and obsolete.
  To notify and clarify the relevant IFCA data to be used for the overhaul of Kelly Aerospace Electrical accessories. Products Affected: All Kelly Aerospace Electrical Accessories (Starters & Alternators). Compliance: Effective Immediately

• Service Information Letter #A-115
  Date: February 16, 2005
  Subject: Recommended Service/Inspection for Alternator Series ALE, ALU, ALY, ALX
  In response to recent complaints of nuisance tripping of the voltage regulator at overvoltage, Kelly Aerospace has completed an investigation of this condition.

• Service Information Letter #A-116
  Date: April 14, 2005
  Subject: Recommended Alternators Brush Holder Replacement For Model ALE, ALH, ALT, ALU, ALX, ALY, ALZ Series
  Since implementation of the current one piece brush holder assembly for the above series alternators, maintenance personnel have complained of difficulty in installing or removing the assembly. Kelly Aerospace has designed a new two piece brush holder which is superior in construction and designed to ease both installation and removal during routine maintenance. These new brush holders are offered as a product improvement and are considered an alternate but will supercede the current brush holder assembly as field stock is depleted.

• Service Information Letter #A-118
  Date: February 9, 2006
  Subject: Replacement Bendix Drive Shaft MZ-326A.
  Clarifies the use of the Bendix starter drive shaft KAPS P/N 326 and 326A. Part number 326A is produced in two interchangeable versions.

• Service Information Letter #A-119
  Date: March 24, 2006
  Subject: Voltage Regulator Adjustment - VR515GA.
  Clarifies the access, adjustment procedures and specifications for the VR515GA and VR515GA-1 voltage regulators.
  

Fuel & Filtration

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• Service Bulletin #045
  Date: March 8, 2012
  Subject: This Service Bulletin This Service Bulletin is being issued to mandate an inspection and recall of affected 201F fuel pumps related to possible fuel leakage.  The corrective action requires affected 201F fuel pumps be returned to the HET factory replacement.  The Service Bulletin may require action Before Further Flight.

• Service Bulletin #041 Rev. A
  Date: March 5, 2012
  Subject: This Service Bulletin is being issued to mandate an inspection regarding fuel leakage at the 201F fuel pump shaft seal. The corrective action requires affected 201F fuel pumps be returned to the HET factory for repair or replacement. Please distribute to customers using the affected HET FAA/PMA approved fuel pumps. Revision A adds six serial numbers to the effectivity.

• Service Bulletin #034
  Date: July 7, 2009
  Subject: A condition may exist in 200F series fuel pumps where the tolerances of the bearing and housing bore vary outside of acceptable limits which may result in failure of the pump drive shaft. This Service Bulletin is being issued to mandate the removal and replacement of all new or rebuilt 200F series fuel pumps that have been manufactured between January 1, 2008 and June 25, 2009 and which have accumulated ten (10) hours or less time in service.

• Service Bulletin #028 Rev. A
  Date: Aug 28, 2007
  Subject: This Service Bulletin is being issued to mandate the replacement of affected fuel pump diaphragm and plunger assemblies part number CFRB15985 manufactured and sold between September of 2005 to July 25, 2007.

• Service Information Letter #A-123 Rev. A
  Date: Oct 9, 2008
  Subject: SIL A-123 Rev. A announces the availability of the 200201-0000 Fuel Pump Overhaul manual Revision D which corrects several minor errors.

• Service Letter #020
  Date: June 1, 2006
  Subject: Availability of Overhaul and Maintenance Manual for the HET 200F and 201F fuel pumps.
  Hartzell Engine Technologies is pleased to announce the availability of the Overhaul and Maintenance Manual for the HET 200F and 201F fuel pumps P/N 200201-0000.

• Service Information Letter #A-109
  Date: September 17, 2002
  Subject: 200F Series Fuel Pump Replacement Notification

• Service Information Letter #A-114 Rev. A
  Date: September 21, 2007
  Subject: Kelly Aerospace Power Systems Oil Filter Application Eligibility.

• Mandatory Service Bulletin #113
  Date: August 6, 2004
  Subject: Isolated reports of minor fuel weepage from the relief valve housing at the parting surface on certain Kelly Aerospace engine driven fuel pumps have come to our attention. This condition has been noticed at the upper end of fuel pressure on Piper Chieftain Aircraft that use Kelly Aerospace Power Systems pumps. The purpose of this service bulletin is to provide information to Piper Chieftain owners, operators, and maintenance personnel regarding the inspection and factory repair of the KAPS 200F Series fuel pumps.
  
  All Navajo Chieftain Aircraft with the New Kelly Aerospace 200F-5002 (62E23186), 200F-5003 (62E23188) and 200F-5004 (62E23187) Fuel Pump(s) installed. NOTE: This bulletin is applicable only to Chieftain* (PA-31-350) Aircraft with pumps bearing the S/Ns found in Table 1 below. Pumps installed on aircraft other than the PA-31-350 are not subject to this bulletin regardless of S/N inclusion in Table 1 below.
  

Turbocharging Systems

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• Alert Service Bulletin #047
  Date: May 8, 2012
  Subject: Hartzell Engine Technologies has discovered that an oil passage in the turbocharger center housing may have been incorrectly located.  This oil passage feeds oil to the journal bearings.  This condition may also be present in the turbocharger center housings sold to the field as piece parts with a date code of H-0112.  This condition may restrict oil flow and damage or destroy the bearings quickly which may result in seizure of the turbocharger with subsequent engine power reduction or engine oil starvation.

• Service Bulletin #042
  Date: June 30, 2011
  Subject: This Service Bulletin is being issued to mandate the return of all HET P/N
  407134-000 turbocharger journal bearings with date codes of H-1110, H-1210,
  H-0111, H-0211, H-0311, H-0411, & H-0511, etched on the bearing.

• Service Information Letter #A-139
  Date: April 1, 2011
  Subject: TE06 model turbocharger alternate thrust bearing. This Service Information Letter introduces the P/N 449886-0001 thrust bearing as an alternate for the P/N 405466-0000 thrust bearing for use in TEO6 model turbochargers as listed in Table 1 of the SIL.

• Service Information Letter #A-142
  Date: March 29, 2011
  Subject: Turbocharger Installation and Turbine Housing Mounting Tab Shim Washers. This Service Information Letter is being issued to advise installation instructions and should a gap be noticed per the instructions, provide a corrective action. The corrective action adds locally procured washers during installation to fill the gap as required.

• Service Bulletin #040 Rev. A
  Date: December 22, 2010
  Subject: Turbocharger CHRA Contamination. Hartzell Engine Technologies (HET) has become aware of a condition affecting certain turbocharger center housing rotating assemblies (CHRA) where debris may not have been removed after the machining operation. This Service Bulletin is being issued to mandate the return of affected turbochargers to HET for disassembly and cleaning of CHRA center housing.

• Service Bulletin #039 Rev. A
  Date: February 10, 2010
  Subject: Turbocharger Turbine Wheel replacement. The revision is being done to avoid confusion of applicable turbocharger part numbers. This is a mandatory service bulletin. The bulletin regards rebuilt turbochargers using reclaimed turbine wheels only. Revision A adds P/N 406610-9028 to Table 1 even though the Reference data for this part number on page 6 is correct. It is anticipated that this will become the subject of an FAA/AD.
  
  Alternate Means of Compliance for AD 2010-07-08 FAA Letter dated April 23, 2010*

• Service Information Letter #A-134
  Date: July 28, 2009
  Subject: This Service Information Letter is issued to provide factory guidance for the replacement of the turbine wheel and shaft assembly, if performing a repair only, due to a conflicting statement generated by revision A of the 400600-0000 Turbocharger Overhaul and Maintenance manual.

• Service Bulletin #037
  Date: July 8, 2009
  Subject: This Service Bulletin is being issued to serve as notification to the owner, operator and/or service facility that use of HET P/N 400999-0000 Overhaul and Maintenance manual and the requirements therein is considered mandatory for any repair or overhaul of any and all valves and controllers covered in the manual.

• Service Bulletin #036
  Date: July 14, 2009
  Subject: This Service Bulletin is being issued to serve as notification to the owner, operator and/or service facility that use of HET P/N 400600-0000 Overhaul and Maintenance manual and the requirements therein is considered mandatory for any repair or overhaul of any and all turbochargers covered in the manual.

• Service Bulletin #035
  Date: July 14, 2009
  Subject: This Service Bulletin is being issued to serve as notification to the owner, operator and/or service facility that HET does not approve of the use of any "unauthorized" part or component in any of its turbo system products.

• Service Information Letter #A-133 Rev. A
  Date: Feb 27, 2009
  Subject: SIL A-133 announces the availability of Revision A to the P/N 400600-0000 turbocharger overhaul and maintenance manual. This a big revision which makes some substantial changes and corrects some minor errors. Some overhaul parts have been removed from the mandatory replacement status and other parts have been added. This is a critical update and the first since the original printing.

• Service Information Letter #A-131
  Date: June 2, 2008
  Subject: This Service Information Letter requires the inspection of KAPS turbocharger P/N 466304-0003 data tags for looseness and applies a remedy. It also requires that a logbook statement be inserted which clearly states the turbocharger part number, serial number, and location.

• Service Information Letter #A-130 Rev. A
  Date: May 21, 2008
  Subject: This Service Information Letter announces the availability of Rev. A of the P/N 400999-0000 Overhaul Manual for Aircraft Turbocharger, Valves & Controllers and serves to notify users of this manual of the current revision status.

• Service Bulletin #031
  Date: February 28, 2008
  Subject: This Service Bulletin is being issued to mandate the inspection and/or replacement of affected turbocharger turbine housing(s) P/N 441977-0023 & 441977-0025.  These were sold on individual turbocharger spares or as piece parts and may be used on Lycoming or TCM engines.

• Service Bulletin #030 Rev. A
  Date: April 1, 2008
  Subject: This Service Bulletin is being issued to mandate the inspection and/or replacement of affected turbocharger turbine housing(s) P/N 441977-0023 & 441977-0025 found on KAPS turbocharger P/N's 465680-0004, 465930-0002, 466412-0003, 465930-0003, and 466412-0004 as used on TCM engines.

• Service Bulletin #029
  Date: February 1, 2008
  Subject: This Service Bulletin is being issued to mandate the inspection and/or replacement of affected turbocharger turbine housing(s) P/N 441977-25 as found on KAPS turbocharger P/N 409170-0001 (Lyc LW-12463) per the serial numbers listed in the table.

• Service Bulletin #027
  Date: July 25, 2007
  Subject: This Service Bulletin is being issued to mandate the replacement of turbocharger part number 466304-0003 (TCM 646677) for an out of balance condition of compressor and turbine wheel assembly. Teledyne Continental Motors engines used on turbocharged Colombia Aircraft,Mooney Aircraft, and Piper Malibu aircraft may be affected.

• Service Bulletin #026 Rev. B
  Date: July 27, 2007
  Subject: Service Bulletin 026 Rev. B revises the serial number effectivity list by adding S/N KCN01116. This Service Bulletin is being issued to mandate the replacement of turbocharger part number 466304-0003 for an out of balance condition of compressor and turbine wheel assembly. Cirrus Design aircraft with the Tornado Alley STC installation are affected.

• Service Information Letter #A-121
  Date: March 15, 2007
  Subject: Procedure for returning valves & controls test set for calibration or repair.

• Service Letter #021
  Date: Jan. 5, 2007
  Subject: We are pleased to announce that a new Turbocharger Valves & Controls Service & Overhaul Manual (P/N 400999-0000) has been issued, superceding several Garrett/Honeywell Manuals. The new manual contains service and overhaul instructions, calibration data, test box operation and an illustrated parts catalog.

• Service Information Letter #A-117
  Date: Nov. 28, 2006
  Subject: This Service Information Letter alerts those who handle or maintain THO8A series turbochargers on specifics of handling, shipping, and storing this particular unit prior to, during or after any service.

• Sales Bulletin #MB-2021
  Date: April 25, 2000
  Subject: Warranty Consideration for Allied Signal/Honeywell Manufactured turbocharger Valves & Controller Products

• Service Letter #019 Rev. B
  Date: May 19, 2006
  Subject: Reissue and Supercedure of Turbocharger Overhaul manual.

• Service Bulletin #020
  Date: October 17, 2001
  Subject: 406610-9005 (Cessna P/N: C295001-0101) Turbochargers with missing anti-rotation pins.
  Only those RAJAY (formally GARRETT) Model TE0659 Turbochargers found to have the Serial Numbers indicated in this Bulletin.

• AD2002-24-07
  Date: January 17, 2003
  Subject: RAJAY Scavenge Pump Replacement
  Replacement of RAJAY Scavenge Pump P/N: 101633-01, -02 within 50 hours of flight time from Jan. 17, 2003.

• Customer Information Bulletin #CIB-2008
  Date: January 30, 2003
  Subject: Attention Aerostar Owners - Replacement of Aerostar Turbocharger Oil Scavenge Pumps
  To provide Aerostar Owners with an FAA approved means of compliance with SB600-131A (AD2002-24-07).

• Service Information Letter #A-111
  Date: February 7, 2003
  Subject: Recommended Service/Inspection for Cessna 402C Exhaust By-Pass Valve Assembly
  This bulletin applies only to the Cessna 402C incorporating the Hartzell Engine Technologies (RAJAY/Garrett) Exhaust By-Pass Valve P/N: 470908-9013 (Cessna P/N: C165006-0107).

• Service Bulletin #022 Rev. A
  Date: September 1, 2004
  Subject: Recommended Service / Inspection. Products Affected: P/N: 46C19836 (466011-0002) Turbocharger, bearing the Serial Numbers found in this Bulletin.
  Due to isolated reports of premature bearing wear/failures in Part Number 46C19836 (466011-0002) turbochargers, Hartzell Engine Technologies recommends an inspection of suspect turbochargers bearing the following Serial Numbers.

• Service Bulletin #023
  Date: February 8, 2006
  Subject: Turbocharger System Operational Tests
  Certain tests are required to be performed after any repair or overhaul of Kelly Aerospace turbochargers prior to returning the aircraft or rotorcraft to service.