# JASC 6322: Rotorcraft Cooling Fan System - Type: JASC system/component code (FAA) - ATA chapter: 63 Main Rotor Drive - Title in the code table: ROTORCRAFT COOLING FAN SYSTEM - Service difficulty reports: 213 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=58 - Page: https://openairdocs.org/jasc/6322 ## What it covers The component which provides a cooling air flow to the rotorcraft piston engine cylinders, oil coolers, etc. Typical parts are fan, shroud, blade, impeller, duct, drive belt, stator, etc. ## Service difficulty reports (213, newest 50) - [SDR AC2A2025122013901](https://openairdocs.org/sdr/AC2A2025122013901), Dec 19, 2025: Agusta AW139. COOLING FAN. SHEARED. DURING TAXI IN FROM RUNWAY, MGB TEMP WARNING ILLUMINATED. (N639CF) - [SDR YV3R2023112200587](https://openairdocs.org/sdr/YV3R2023112200587), Nov 11, 2023: Robsin R22BETAII. FANWHEEL. DEFECTIVE. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 BOLTS WERE LOOSE WITHIN 5.0 HOURS. - [SDR 8HBR20220228041](https://openairdocs.org/sdr/8HBR20220228041), Jan 19, 2022: Robsin R22BETA. NONE. CRACKED. THE ENGINE COOLING FAN WHEEL WAS REMOVED TO FACILITATE OTHER MAINTENANCE AND A CRACK WAS FOUND ON THE FAN AT A BALANCE B (N924SH) - [SDR AC2A2021101513902](https://openairdocs.org/sdr/AC2A2021101513902), Oct 15, 2021: Agusta AB139. COOLING FAN. CONTAMINATED. MAIN GEARBOX OIL COOLER FAN WAS REMOVED AND REPLACED DUE TO MGB FAN QUILL SEAL LEAKING ALLOWING OIL TO MIGRATE TO FAN BE (N139FW) - [SDR AC2A2021101513901](https://openairdocs.org/sdr/AC2A2021101513901), Oct 15, 2021: Agusta AB139. SEAL. LEAKING. MAIN GEARBOX OIL COOLER FAN DRIVE SEAL LEAKING (N139FW) - [SDR AC2A2021061013901](https://openairdocs.org/sdr/AC2A2021061013901), Apr 24, 2021: Agusta AB139. COOLING FAN. LEAKING. OIL COOLER FAN WAS REMOVED AND REPLACED DUE TO MGB FAN QUILL SEAL LEAKING ALLOWING OIL TO MIGRATE TO FAN BEARINGS. TEARD (N139FW) - [SDR YV3R2020111400386](https://openairdocs.org/sdr/YV3R2020111400386), Nov 11, 2020: Robsin R22BETAII. FANWHEEL. CRACKED. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 WAS CRACKED. - [SDR AC2A2021061013903](https://openairdocs.org/sdr/AC2A2021061013903), Oct 11, 2020: Agusta AB139. COOLING FAN. LEAKING. OIL COOLER FAN WAS REMOVED AND REPLACED DUE TO MGB FAN QUILL SEAL LEAKING ALLOWING OIL TO MIGRATE TO FAN BEARINGS. TEARD (N139FW) - [SDR YV3R2020101400366](https://openairdocs.org/sdr/YV3R2020101400366), Oct 8, 2020: Robsin R22BETAII. FANWHEEL. CRACKED. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 WAS FOUND CRACKED. - [SDR YV3R2020101400365](https://openairdocs.org/sdr/YV3R2020101400365), Oct 8, 2020: Robsin R22BETAII. FANWHEEL. CRACKED. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 WAS FOUND CRACKED. - [SDR YV3R2020072400307](https://openairdocs.org/sdr/YV3R2020072400307), Jul 21, 2020: Robsin R22BETAII. FANWHEEL. CRACKED. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 CONE P/N: A187-4 WAS FOUND CRACKED. - [SDR AC2A2021061013902](https://openairdocs.org/sdr/AC2A2021061013902), Jul 3, 2020: Agusta AB139. COOLING FAN. LEAKING. OIL COOLER FAN WAS REMOVED AND REPLACED DUE TO MGB FAN QUILL SEAL LEAKING ALLOWING OIL TO MIGRATE TO FAN BEARINGS. TEARD (N139FW) - [SDR YV3R2019012200080](https://openairdocs.org/sdr/YV3R2019012200080), May 7, 2019: Robsin R22BETAII. FANWHEEL. CRACKED. CUSTOMER REPORTED FANWHEEL ASSEMBLY P/N: B174-1 WAS CRACKED. - [SDR YV3R2019031600047](https://openairdocs.org/sdr/YV3R2019031600047), Mar 12, 2019: Robsin R22BETAII. BOLT. LOOSE. CUSTOMER REPORTED HUB BOLTS WERE FOUND LOOSE. - [SDR 2019FA0000010](https://openairdocs.org/sdr/2019FA0000010), Jan 11, 2019: Robsin R22BETAII. HUB. UNSERVICEABLE. A POST FLIGHT INSPECTION OF THE DRIVE SYSTEM WAS PERFORMED AFTER ENCOUNTERING A FLICKERING CLUTCH LIGHT. DURING THE INSP (N252CS) - [SDR 8HBR20170406002](https://openairdocs.org/sdr/8HBR20170406002), Mar 31, 2017: Robsin R22BETAII. HUB. CRACKED. DURING THE REPLACEMENT OF THE CRANKSHAFT SEAL THE AIRCRAFT FANWHEEL WAS REMOVED AND THE MOUNTING HUB WAS FOUND CRACKED. (N779SH) - [SDR AC2R2016120501](https://openairdocs.org/sdr/AC2R2016120501), Dec 5, 2016: Agusta AW139. BEARING. ROUGH. REMOVED OIL COOLER FAN FOR OVERHAUL. ROTATED FAN BY HAND. FOUND BEARING TO BE ROUGH. (N639GG) - [SDR AC2R2016112901](https://openairdocs.org/sdr/AC2R2016112901), Nov 21, 2016: Agusta AW139. FAN. FAILED. MGB OIL TEMP WARNING CAS MESSAGE CAME ON IN FLIGHT APPROX. 10 MINUTES AFTER TAKE OFF FROM OFFSHORE LOCATION. FOUND MGB O (N639WW) - [SDR CHIR201606152436](https://openairdocs.org/sdr/CHIR201606152436), Jun 14, 2016: Boeing 1072. SEAL. FAILED. THE AFT TRANSMISSION, PN 107D2010-34, SN TA-9-22 WAS REMOVED FROM ACFT FOR A SCHEDULED INSPECTION. WHILE IN THE SHOP, TH (N6674D) - [SDR CHIR020166062396](https://openairdocs.org/sdr/CHIR020166062396), Jun 6, 2016: Dhav DHC2MK3. GARLOCK SEAL. FAILED. DURING AN INSPECTION, MECHANIC REMOVED AFT TRANSMISSION LUBE FILTER AND NOTICED LARGE METALLIC CHIPS IN THE FILTER HOUSI (N6682D) - [SDR CA151127011](https://openairdocs.org/sdr/CA151127011), Nov 11, 2015: Robsin R22BETA. BEARING. FAILED. (CAN) PILOT NOTICED SMOKE IN THE COCKPIT WHILE IN FLIGHT. HELICOPTER WAS LANDED SAFELY. LOWER ACTUATOR BEARING ASSY WAS - [SDR 2015FA0000292](https://openairdocs.org/sdr/2015FA0000292), Jun 29, 2015: Robsin R22BETA. BEARING. DAMAGED. DURING FLIGHT THERE WAS REPORT OF AN ABNORMAL VIBRATION AS WELL AS AN INTERMITTENT CLUTCH LIGHT INDICATION. MAINTENANCE (N7087J) - [SDR CHIR201410151754](https://openairdocs.org/sdr/CHIR201410151754), Oct 14, 2014: Boeing 234. CASE. CRACKED. CASE ASSEMBLY AT WEB OR LINER 247 HAS INDICATION OF A CRACK APPROXIMATELY 1.5" LONG. CRACK AT HOUSING IN PREVIOUS WELD R (N242CH) - [SDR CA140414011](https://openairdocs.org/sdr/CA140414011), Apr 14, 2014: Robsin R44RAVENII. BEARING. LACK OF LUBE. (CAN) DURING THE 50 HOUR INSPECTION OF THE HELICOPTER, THE LOWER FAN SHAFT BEARING WAS FOUND TO BE EXTRUDING A BLACK RES - [SDR CA110718013](https://openairdocs.org/sdr/CA110718013), Jun 30, 2011: Bell 206L4. FAN. FAILED. DURING A FLIGHT THE PILOT REPORT SHUTDOWN NR 2 ENGINE BECAUSE OF OIL OVERTEMP UP TO 150 DEGREES AND ABOVE 120 DEGREES FO - [SDR 2009FA0000947](https://openairdocs.org/sdr/2009FA0000947), Oct 30, 2009: Skrsky S76A. BLOWER. FAILED. ON A RETURN FLT BACK TO HOME BASE, AT APPROXIMATELY 2130-2200 HRS, CREW DETECTED AN ELECTRICAL BURNING ODOR. IT WAS IMME (N761MH) - [SDR CA081107001](https://openairdocs.org/sdr/CA081107001), Nov 4, 2008: Robsin R22BETAII. MOUNT. CRACKED. (CAN) AT REINSTALLATION OF FANWHEEL ASSEMBLY, FOUND TAPERED MOUNTING FLANGE COMPLETELY CRACKED LONGITUDINALLY. UNIT SENT - [SDR 2008FA0000741](https://openairdocs.org/sdr/2008FA0000741), Oct 26, 2008: Hughes 369FF. NUT. BACKED OUT. OIL COOLER BLOWER DRIVEN PULLEY RETAINING NUT IS BACKING OFF OF SHAFT DURING NORMAL US. NUT IS A STAINLESS STEEL, SILVER (N5185G) - [SDR CA080407007](https://openairdocs.org/sdr/CA080407007), Apr 5, 2008: Bell 47G4. GEAR SET. SHEARED. APPROX 100 HRS AGO TRANSMISSION WAS O/H AND NEW PMA GEAR SET WAS INSTALLED S/N GR586A FROM HELICOPTER TECH DURING FLIGHT - [SDR M7K2008F00080](https://openairdocs.org/sdr/M7K2008F00080), Sep 19, 2007: Urocop EC130B4. BLOWER MOTOR. SEIZED. PILOT REPORTED BLOWER VERY NOISY/GROWLS IN OPERATION. CLOSER EXAMINATION REVEALED VERY ROUGH SHAFT BEARING. A NEW REPLAC (N817MH) - [SDR CA060322009](https://openairdocs.org/sdr/CA060322009), Mar 8, 2006: Hughes 369D. BELT. FAILED. (CAN) DURING A 100 HOUR INSPECTION THE BLOWER BELT WAS NOTED AS HAVING SEVERAL TEETH MISSING. BELT IS IDENTIFED WITH THE - [SDR KBM2005F00221](https://openairdocs.org/sdr/KBM2005F00221), Jun 23, 2005: Snias AS350B2. MOTOR. RATCHETING. MOTOR, MAKING RATCHETING NOISE. REMOVED AND REPLACE. (K) (N350SH) - [SDR KBM2005F00136](https://openairdocs.org/sdr/KBM2005F00136), Jun 23, 2005: Snias AS350B2. MOTOR. RATCHETING. MOTOR, MAKING RACHETING NOISE. REMOVED AND REPLACED. (K) (N350SH) - [SDR CA050216010](https://openairdocs.org/sdr/CA050216010), Sep 11, 2004: Bell 206B. HANGER ASSY. ROTATED. (CAN) PILOT REPORTED A HIGH FREQUENCY VIBRATION. UPON INVESTIGATION, THE BEARING IN THE FORWARD HANGER ASSEMBLY OF THE O - [SDR CA040811008](https://openairdocs.org/sdr/CA040811008), Aug 5, 2004: Aerosp AS355F1. BLOWER. DAMAGED. (CAN) DURING OPERATION A NOISE WAS HEARD FROM THE BACK OF THE AIRCRAFT, AIRCRAFT WAS LANDED AND DURING INSPECTION TO DET - [SDR CA040120002](https://openairdocs.org/sdr/CA040120002), Jan 19, 2004: Robsin R44. HUB. GALLED. (CAN) OTHER PART AFFECTED LOWER BEARING C181-3 S/N 1328 UPON REMOVING FAN ASSY FOR ACCESS TO A DEFECTIVE ACTUATOR C051-1 - [SDR HEEA086701](https://openairdocs.org/sdr/HEEA086701), May 22, 2003: Bell 214ST. BLOWER. INOPERATIVE. NR 2 ENGINE BLOWER OFF CAUTION LIGHT ILLUMINATED IN FLIGHT. TO BE SENT TO VENDOR FOR REPAIR. (N8045T) - [SDR HEEA083538](https://openairdocs.org/sdr/HEEA083538), Jan 13, 2003: Skrsky S76A. BLOWER. DAMAGED. RIVETS LOOSE ON HOUSING. REPLACED WITH SERVICEABLE PART. (N1546G) - [SDR HEEA082566](https://openairdocs.org/sdr/HEEA082566), Dec 6, 2002: Bell 214ST. SHAFT. BROKEN. NR 2 ENGINE PARTICLE SEPERATOR BLOWER SHAFT BROKEN. RETURNED TO VENDOR. (N59806) - [SDR AUS20020628](https://openairdocs.org/sdr/AUS20020628), Apr 21, 2002: Bell 47G3B. STUD. FAILED. (AUS) COOLING FAN MOUNT STUD LOCATED ON CRANKCASE FAILED. LOSS OF TENSION ALLOWED BELT TO FALL OFF AND DESTROY THE COOLI - [SDR HEEA078225](https://openairdocs.org/sdr/HEEA078225), Feb 28, 2002: Snias AS350B. MOTOR. SEIZED. COOLER BLOWER MOTOR HAS IT`S BEARINGS FROZEN. (N855PH) - [SDR HEEA077870](https://openairdocs.org/sdr/HEEA077870), Feb 19, 2002: Bell 407. BEARING. ROUGH. FWD BEARING ROUGH AND MAKING NOISE. (N493PH) - [SDR HEEA077620](https://openairdocs.org/sdr/HEEA077620), Dec 19, 2001: Bell 407. HOUSING. DAMAGED. COOLER BLOWER HOUSING HAS WORKING RIVETS. (N493PH) - [SDR HEEA077584](https://openairdocs.org/sdr/HEEA077584), Dec 18, 2001: Bell 407. DUCT. CRACKED. OIL COOLER DUCT CRACKED. (N496PH) - [SDR HEEA077204](https://openairdocs.org/sdr/HEEA077204), Nov 6, 2001: Bell 407. BLOWER. FAILED. FORWARD BEARING LOUD AND ROUGH. (N496PH) - [SDR HEEA076051](https://openairdocs.org/sdr/HEEA076051), Sep 24, 2001: Bell 214ST. BLOWER. FAILED. THE #1 PARTICLE SEPARATOR CAUTION LIGHT CAME ON. MAINTENANCE FOUND PARTICLE SEPARATOR BLOWER SHAFT SHEARED. (N8045T) - [SDR AUS20010764](https://openairdocs.org/sdr/AUS20010764), Jul 18, 2001: Bell 412. FAN BLADE. FAILED. (AUS) NO1 ENGINE OIL COOLER BLOWER FAN BLADES SEPARATED FROM HUB. - [SDR HEEA073787](https://openairdocs.org/sdr/HEEA073787), Jun 19, 2001: Snias AS350B2. OIL COOLER. CORRODED. OIL COOLER CORRODED. REPLACED WITH SERVICEABLE TRANS OIL COOLER. (N40466) - [SDR HEEA073643](https://openairdocs.org/sdr/HEEA073643), Jun 19, 2001: Bell 214ST. BLOWER. FAILED. SHAFT SHEARED. SENDING TO VENDOR FOR REPAIR. (N3897N) - [SDR HEED073552](https://openairdocs.org/sdr/HEED073552), Jun 14, 2001: Bell 407. SHAFT. VIBRATION. HIGH RDA VIBRATION LEVEL. REPLACED UNIT. (N3193E) All 213: https://openairdocs.org/jasc/6322/reports.md ## Other codes in chapter 63 - [JASC 6300](https://openairdocs.org/jasc/6300): Main Rotor Drive System (637 reports) - [JASC 6310](https://openairdocs.org/jasc/6310): Engine/Transmission Coupling (772 reports) - [JASC 6320](https://openairdocs.org/jasc/6320): Main Rotor Gearbox (1,930 reports) - [JASC 6321](https://openairdocs.org/jasc/6321): Main Rotor Brake (275 reports) - [JASC 6330](https://openairdocs.org/jasc/6330): Main Rotor Transmission Mount (603 reports) - [JASC 6340](https://openairdocs.org/jasc/6340): Rotor Drive Indicating System (265 reports) - [JASC 6397](https://openairdocs.org/jasc/6397): Main Rotor Drive System Wiring (17 reports) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.