# Service difficulty reports: N4573B, cancelled May 11, 2024 A list on [N4573B, cancelled May 11, 2024](https://openairdocs.org/deregistered/N4573B-2024-05-11.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR HEEA082674](https://openairdocs.org/sdr/HEEA082674.md): Faceplate · damaged · Dec 11, 2002 · N4573B · Bolkms BO105S · Interphone/Passenger Announcement (PA) System > FACEPLATE BAD. FOUND LIGHT PANEL, VOLUME AND SELECTOR KNOBS, SWITCHES S6, S10, AND S11 BAD. REPLACED, REPAIRED. BENCH CHECK GOOD. - [SDR HEEA079289](https://openairdocs.org/sdr/HEEA079289.md): Blade · eroded · May 24, 2002 · N4573B · Bolkms BO105S · Main Rotor Blades > THE OUTBOARD ABRASION STRIP ON MAIN ROTOR BLADE HAS EROSION HOLE. - [SDR HEEA063855](https://openairdocs.org/sdr/HEEA063855.md): Nozzle · cracked · Aug 31, 1999 · N4573B · Bolkms BO105S · Turbine Section > ENGINE REMOVED DUE TO 3,500 HOUR OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED VANES ON NR 1 NOZZLE. INSTALLED NEW PART. - [SDR HEEA062899](https://openairdocs.org/sdr/HEEA062899.md): Transceiver · inoperative · Jul 12, 1999 · N4573B · Bolkms BO105S · VHF Communications System > INOPERATIVE. WILL NOT COME ON. PERFORMED PRELIMINARY INSPECTION. FOUND UNIT TO BE DRAWING CURRENT, BUT ALL POWER SUPPLY VOLTAGES ARE LOW. - [SDR HEEA060468](https://openairdocs.org/sdr/HEEA060468.md): Transducer · reads low · Jan 25, 1999 · N4573B · Bolkms BO105S · Fuel Pressure Indicator > TRANSDUCER READS EXCESSIVLEY LOW. - [SDR HEEA0016738](https://openairdocs.org/sdr/HEEA0016738.md): Transducer · failed · Nov 6, 1998 · N4573B · Bolkms BO105S · Fuel Pressure Indicator > TRANSDUCER - OUTPUT DOES NOT CHANGE WITH PRESSURE APPLIED. - [SDR HEEA0016704](https://openairdocs.org/sdr/HEEA0016704.md): Indicator · fluctuated · Nov 6, 1998 · N4573B · Bolkms BO105S · Engine RPM Indicating System > OIL INDICATION FLUCTUATES, NR 1 NEEDLE STICKS AT ZERO. - [SDR HEEA0016650](https://openairdocs.org/sdr/HEEA0016650.md): Drive Shaft · cracked · Nov 5, 1998 · N4573B · Bolkms BO105S · Tail Rotor Drive Shaft > CRACKS AND FLAKING ON INBOARD JOURNAL FLAME SPRAY COATING. - [SDR HEEA0016031](https://openairdocs.org/sdr/HEEA0016031.md): Fuel Control · out of adjust · Sep 11, 1998 · N4573B · Bolkms BO105S · Fuel Control/Reciprocating Engines > ON FIRST START AFTER INSTALLATION IN THE AIRCRAFT, TOT ROSE RAPIDLY. FOUND START/ACCEL AND START/DERICH ADJUSTMENTS TURNED TO MINIMUM, NO MORE ADJUSTMENT AVAILABLE. RECEIVED UNIT IN SHOP WITH START DERICHMENT AND START ACCELERATION ADJUSTMENTS BOTH ADJUSTED - [SDR HEEA0015933](https://openairdocs.org/sdr/HEEA0015933.md): Servomotor · failed · Aug 28, 1998 · N4573B · Bolkms BO105S · Fuel Controlling System > SERVO MOTOR WILL NOT ACTUATE, FILTER SHORTED TO GROUND. - [SDR HEEA0015560](https://openairdocs.org/sdr/HEEA0015560.md): Transducer · failed · Aug 14, 1998 · N4573B · Bolkms BO105S · Fuel Pressure Indicator > NO OUTPUT FROM TRANSDUCER. - [SDR HEEA0015058](https://openairdocs.org/sdr/HEEA0015058.md): Bevel Gear Set · spalled · Jun 30, 1998 · N4573B · Bolkms BO105S · Main Rotor Gearbox > SPALLING OF M/R GEARBOX GEAR TEETH. SCRAPPED PARTS AND REPLACED WITH NEW PARTS. - [SDR HEEA0014678](https://openairdocs.org/sdr/HEEA0014678.md): Indicator · out of tolerance · Jun 10, 1998 · N4573B · Bolkms BO105S · Engine EGT/TIT Indicating System > FOUND ENGINE TOT UNIT TO READ OUT OF TOLERANCE THROUGHOUT SCALE. - [SDR HEEA0014514](https://openairdocs.org/sdr/HEEA0014514.md): Transmitter · inoperative · Jun 4, 1998 · N4573B · Bolkms BO105S · Fuel Pressure Indicating > FUEL PRESSURE TRANSMITTER INOPERABLE. - [SDR HEEA0013240](https://openairdocs.org/sdr/HEEA0013240.md): Indicator · failed · Mar 4, 1998 · N4573B · Bolkms BO105S · Main Rotor Indicating System > MAST MOMENT INDICATOR HAS NO INDICATION IN FLIGHT. - [SDR HEEA0013239](https://openairdocs.org/sdr/HEEA0013239.md): Transmitter · failed · Mar 4, 1998 · N4573B · Bolkms BO105S · Main Rotor Indicating System > MAST MOMENT INDICATOR NO INDICATION IN FLIGHT. - [SDR HEEA0012765](https://openairdocs.org/sdr/HEEA0012765.md): Bevel Gear · spalled · Feb 5, 1998 · N4573B · Bolkms BO105S · Main Rotor Gearbox > FOUND SPALLING ON BEVEL GEAR TEETH. REPLACED WITH SERVICEABLE PART. - [SDR HEEA0012764](https://openairdocs.org/sdr/HEEA0012764.md): Sun Gear · spalled · Feb 5, 1998 · N4573B · Bolkms BO105S · Main Rotor Gearbox > FOUND SPALLING ON SUN GEAR TEETH. REPLACED WITH SERVICEABLE PART. - [SDR HEEA0012378](https://openairdocs.org/sdr/HEEA0012378.md): Spline Adapter · worn · Dec 18, 1997 · N4573B · Bolkms BO105S · Turbine Engine Compressor Section > ENGINE REMOVED DUE TO CRACKED COMPRESSOR SCROLL AND VIBRATION. UPON INSPECTION OF COMPRESSOR PARTS NOTED: WORN BEYOND SERVICEABLE LIMITS ON SPLINE ADAPTER RETAINING RING GROOVE. INSTALLED A NEW SPLINE ADAPTER. - [SDR HEEA0011883](https://openairdocs.org/sdr/HEEA0011883.md): Transducer · failed · Nov 10, 1997 · N4573B · Bolkms BO105S · Fuel Pressure Sensor > INDICATES LOW OUT OF TOLERANCE. - [SDR HEEA0011882](https://openairdocs.org/sdr/HEEA0011882.md): Transducer · defective · Nov 10, 1997 · N4573B · Bolkms BO105S · Fuel Pressure Indicator > FUEL PRESSURE INDICATES LOW OUT OF TOLERANCE. - [SDR 98ZZZX2099](https://openairdocs.org/sdr/98ZZZX2099.md): Governor · malfunctioned · Nov 2, 1997 · N4573B · Bolkms BO105S · Turbine Governor > DURING FLIGHT, NR 2 ENGINE BEGAN OSCILLATING. PILOT RETURNED TO BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED ENGINE N2 GOVERNOR DUE TO STIFF CONTROL SHAFT. REF: ALLISON C-20 IPC, CHAPTER 73-20-00, FIG 2, ITEM 81. - [SDR HEEA0011366](https://openairdocs.org/sdr/HEEA0011366.md): Gyro · defective · Oct 9, 1997 · N4573B · Bolkms BO105S · Directional Gyro and Indicating System > DIR GYRO INTERMEDIATE GEAR OUT OF BALANCE. EAST HEADING PRECESSES EXCESSIVELY. - [SDR HEEA0010554](https://openairdocs.org/sdr/HEEA0010554.md): Coupling · worn · Aug 5, 1997 · N4573B · Bolkms BO105S · Turbine Section > ENGINE REMOVED DUE TO METAL. UPON INSPECTION OF TURBINE PARTS NOTED: WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES (FAILED NO GO GAUGE) INSTALLED A NEW N1 COUPLING. - [SDR HEEA0010072](https://openairdocs.org/sdr/HEEA0010072.md): Transceiver · inoperative · Jun 11, 1997 · N4573B · Bolkms BO105S · Localizer/VOR System > TRANSCEIVER LOCALIZER INOPERATIVE. - [SDR HEEA0010015](https://openairdocs.org/sdr/HEEA0010015.md): Transducer · failed · Jun 2, 1997 · N4573B · Bolkms BO105S · Fuel Pressure Sensor > TRANSDUCER PEGS HIGH AND FLUCTUATES. - [SDR HEEA968474](https://openairdocs.org/sdr/HEEA968474.md): Tube Assy. · out of spec · Nov 13, 1996 · N4573B · Bolkms BO105S · Turbine Engine Accessory Drive > ENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING:TUBE FAILED DIMENSIONAL CHECK PER CEB 1307. INSTALLED A NEW PART. - [SDR HEEA968222](https://openairdocs.org/sdr/HEEA968222.md): Rear Diffuser · mis mfg · Oct 11, 1996 · N4573B · Bolkms BO105S · Turbine Engine Compressor Section > RECEIVING INSPECTION REVEALED: BEARING BORE UNDERSIZED MEASURED 2.165 (SPECS 2.1654 - 2.1659) ON REAR DIFFUSER. ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet' WHERE n_number = 'N4573B' AND deregistration_id = 'N4573B-2024-05-11' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/deregistered/N4573B-2024-05-11/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.