# Service difficulty reports: Pratt & Whitney JFTD12A-5A

A list on [Pratt & Whitney JFTD12A-5A](https://openairdocs.org/engine/pratt-whitney-jftd12a-5a.md).

Newest first. General aviation reporting is voluntary.

- [SDR JYDR20201013282](https://openairdocs.org/sdr/JYDR20201013282.md): Attach Bolt · broken · Oct 13, 2020 · N159AC · Skrsky S64F · Engine/Transmission Coupling
  > PILOTS SUDDENLY FELT A VIBRATION AND HEARD A HOWLING NOISE. THEY RETURNED TO THE LANDING SITE AND SHUT DOWN. AT INSPECTION, MAINTENANCE FOUND 1 OF 3 NAS628-15 BOLT BROKEN IN HALF ON THE NR 2 HIGH SPEED SHAFT ON THE FORWARD END, WHERE IT ATTACHES TO THE FREE
- [SDR JYDR20201008218](https://openairdocs.org/sdr/JYDR20201008218.md): Engine · overtemp · Oct 7, 2020 · N159AC · Skrsky S64F · Engine (Turbine/Turboprop)
  > AIRCRAFT WAS ON SHORT FINAL AT 50 FT AGL WHEN NR 1 ENGINE LOW SPEED CHIME CAME ON. PILOT NOTED DECREASING N1 RPM WITH RISING T% (ROLLBACK). PROPER ENGINE IDENTIFIED AND SHUT DOWN. RECORDING T5 INDICATOR CHECKED AND FOUND ENGINE HAD REACHED 784C FOR 4 SECOND
- [SDR JYDR20180713190](https://openairdocs.org/sdr/JYDR20180713190.md): Disc · cracked · Jul 11, 2018 · Skrsky S64F · Turbine Engine Compressor Section
  > DURING INSPECTION IAW AD 97-02-13 USING AMOC LETTER. 6 CRACKS WERE FOUND AT THE TIE BOLT THROUGH HOLES. CRACKS WERE FOUND WITH BOTH FPI AND EDDY CURRENT. AD STATES THAT DISK IS TO BE INSPECTED AT OR BEFORE 3000 HOURS TT AND 1500 HOURS THEREAFTER. THIS DISK HA
- [SDR JYDR20160422098](https://openairdocs.org/sdr/JYDR20160422098.md): Bearing Race · cracked · Apr 21, 2016 · N178A · Skrsky S64F · Main Rotor Head
  > FOUND HORIZONTAL HINGE PIN INNER BEARING RACE CRACKED DURING REPAIR. MRH HAD 292.3 HRS. REMAINING TO O/H. MFG HAS BEEN INFORMED.
- [SDR CA150511015](https://openairdocs.org/sdr/CA150511015.md): Solenoid · defective · May 9, 2015 · Skrsky CH54B · Aerial Tow Equipment
  > (CAN) UNCOMMANDED INADVERTENT RELEASE OF LOWER HOOKS.
- [SDR JYDR2013110800239](https://openairdocs.org/sdr/JYDR2013110800239.md): Servo · worn · Nov 8, 2013 · N171AC · Skrsky S64F · Rotorcraft Servo System
  > DURING A SCHEDULED MAIN GEAR BOX CHANGE, THE LT LATERAL PRIMARY SERVO WAS FOUND TO HAVE A SEVERELY WORN BOLT AND BUSHING AT THE LOWER PIVIT FOLLOW UP ARM. SERVO WAS REMOVED FROM SERVICE AND RETURNED TO THE REPAIR STATION FOR INVESTIGATION. THE MFG IS PARTISIP
- [SDR JYDR2013110801239](https://openairdocs.org/sdr/JYDR2013110801239.md): Servo · worn · Nov 8, 2013 · N171AC · Skrsky S64F · Rotorcraft Servo System
  > DURING A SCHEDULED MAIN GEAR BOX CHANGE, THE LT LATERAL PRIMARY SERVO WAS FOUND TO HAVE A SEVERELY WORN BOLT AND BUSHING AT THE LOWER PIVIT FOLLOW UP ARM. SERVO WAS REMOVED FROM SERVICE AND RETURNED TO THE REPAIR STATION FOR INVESTIGATION. THE MFG IS PARTICIP
- [SDR 2009FA0000042](https://openairdocs.org/sdr/2009FA0000042.md): Nut · cracked · Jan 8, 2009 · N163AC · Skrsky CH54B · Main Rotor Head
  > DURING THE DISASSEMBLY OF THE MRH, 1 NUT WAS FOUND CRACKED. THE NUT IS CRACKED THROUGH ON ONE SIDE AND RUNS THE LENGTH OF THE NUT. THE UNT IS ONE OF (2) THAT SECURES THE DAMPER BRACKET TO THE MRH LOWER PLATE. THE CAUSE OF THE CRACK IS BEING INVESTIGATED. (
- [SDR 2006FA0000951](https://openairdocs.org/sdr/2006FA0000951.md): Axle · cracked · Sep 8, 2006 · N158AC · Skrsky CH54B · Main Landing Gear Strut/Axle/Truck
  > (REF NR: MDR06-091) UPON DISASSEMBLY, AXLE WAS FOUND TO BE CRACKED AND RUNS AROUND THE CIRCUMFERENCE. THE TRACTURE APPEARS TO ROIGINATE IN THE WELD ON THE CENTER OF THE AXLE SHAFT. THE AXLE WAS FRACTURED UNDER THE SOCKET, PN 6425-50202-101, AS EVIDENCED BY A
- [SDR JYD2006F00000](https://openairdocs.org/sdr/JYD2006F00000.md): Bearing · spalled · Dec 9, 2005 · N159AC · Skrsky CH54B · Main Rotor Mast/Swashplate
  > BEARING OUTER RACE SPALLED AND CRACKED. SPALLING AND CRACK ARE ON NR1 BEARING ROW ONLY. CRACK IS APPROXIMATELY 2.25 INCHES LONG. PROBABLE CAUSE IS UNKNOWN. THE BEARING RACE WILL BE ANALYZED TO DETERMINE THE CAUSE. THERE ARE NO RECOMMENDATIONS TO PREVENT RE
- [SDR 2005FA0000820](https://openairdocs.org/sdr/2005FA0000820.md): Turbine Blades · broken · Apr 13, 2005 · N159AC · Skrsky S64F · Turbine Section
  > COMPRESSOR ASSY WAS REMOVED FROM AC FOR FAILING VIBRATION ANALYSIS. DURING THE PRELIMINARY INSPECTION IT WAS NOTED THAT A PIECE OF 2ND STAGE TURBINE BLADE OUTER SHROUD KNIFE EDGE WAS MISSING. THE MISSING PIECE WAS APPROXIMATELY.500 INCH LONG AND FROM THE AF
- [SDR 2005FA0000818](https://openairdocs.org/sdr/2005FA0000818.md): Duct · cracked · Mar 2, 2005 · N189AC · Skrsky S64E · Turbine Section
  > NR 1 ENGINE REMOVED FROM ACFT, DUE TO 5 INCH AXIAL BULGE AT OUTER TURBINE CASE, 2-3 OCLOCK POSITION WITH APPROX.5625 INCH HORIZONTAL CRACK RUNNING THROUGH CENTER MOST PORTION OF THE BULGED AREA. UPON REMOVAL OF ENGINE HOT SECTION, TURBINE OUTLET DUCT FOUN
- [SDR 2005FA0000817](https://openairdocs.org/sdr/2005FA0000817.md): Thrust Washer · worn · Feb 14, 2005 · N173AC · Skrsky S64E · Main Rotor Gearbox
  > MAIN GEAR BOX, SN A6051 REMOVED FOR BRASS CONTAMINATION. UPON DISASSEMBLY DISCOVERED BRASS MATERIAL WAS FROM SECOND STAGE PLANETARY THRUST WASHERS. 34 OUT OF 36 THRUST WASHERS WORN ON ID BEYOND MAX SERVICEABLE LIMITS. 18 EA BEARINGS HAD SHARP EDGES INNER RAC
- [SDR 2005FA0000340](https://openairdocs.org/sdr/2005FA0000340.md): Bearing Race · cracked · Jan 10, 2005 · N158AC · Skrsky S64F · Main Rotor Head
  > (MDR05-072) THE MRH SLEEVE AND SPINDLE ASSY DEVELOPED AN OIL LEAK WHILE ON AIRCRAFT AND WAS NOTED DURING ROUTE INSPECTION. UPON REMOVAL AND REPLACEMENT WITH A SERVICEABLE ASSY, A CRAK WAS FOUND ON THE INNER RACE. VISUAL INSPECTION SHOWS WEAR AND CORROSION TY
- [SDR JYDRMDR04069](https://openairdocs.org/sdr/JYDRMDR04069.md): Housing · cracked · Dec 6, 2004 · N159AC · Skrsky S64F · Main Rotor Gearbox
  > MGB WAS REMOVED FOR MAIN SHAFT REPLACEMENT AND OVERHAUL. AFTER DISASSEMBLY OF GEAR BOX, THE UPPER HOUSING WAS LOCALLY BLENDED, ETCHED UNDER THE INPUTS AND INSPECTED BY FPI. THE HOUSING WAS REJECTED FOR CRACKS ON THE LT AND RT SIDE. POOR REWELD QUALITY OF CA
- [SDR MDR03032](https://openairdocs.org/sdr/MDR03032.md): Bleed Valve · obstructed · Oct 2, 2004 · N178AC · Skrsky S64F · Compressor Bleed Valve
  > NR 1 ENG OIL PRESS WAS INDICATING LOWER THAN NR 2 ENG. PRESS INDICATED 45 PSI. ADJUSTED PRESS VALVE TO INCREASE CHECK AT NEXT FLT. NR 1 ENG WAS STARTED, INDICATED NML GROUND IDLE. ACCELERATING TO 70 PERCENT N2, OIL PRESS DROPPED OFF, CAUTION LIGHT ILLUM, P
- [SDR 2004F00286](https://openairdocs.org/sdr/2004F00286.md): Duct · cracked · Jul 13, 2004 · Skrsky S64E · Turbine Engine Compressor Section
  > DURING DISASSEMBLY OF N1 SECTION, IT WAS NOTICED THAT THERE WAS A LARGE PIECE OF MATERIAL WEDGED IN BETWEEN TWO 1ST STAGE BLADES. UPON FURTHER DISASSEMBLY/INVESTIGATION THE OUTLET DUCT ASSEMBLY WAS FOUND TO BE MISSING A LARGE SECTION OF THE OUTER DUCT APPROXI
- [SDR MDR03039](https://openairdocs.org/sdr/MDR03039.md): Attach Angle · cracked · Dec 15, 2003 · N158AC · Skrsky CH54B · Fuselage Miscellaneous Structure
  > DURING A SCHEDULED INSPECTION, LT ATTACH ANGLE, PN 6420-66340-105, WAS FOUND CRACKED AT STA 767.8 LBL 5.5, WL 177.1. THE CRACK ORIGINATED AT THE BOTTOM HUCK FASTENER AND TRAVELED DOWN TO THE EDGE OF THE ANGLE. THESE ANGLES ATTACH THE INTERCOSTALS TO THE CANT
- [SDR 98ZZZX2255](https://openairdocs.org/sdr/98ZZZX2255.md): Blade · fractured · Apr 24, 1998 · N159AC · Skrsky S64F · Turbine Engine Compressor Section
  > ON 4-24-98, AIRCRAFT WAS ON A FIRE FIGHTING MISSION. DURING CLIMB-OUT, A LOUD 'BANG' SOUND OCCURRED, FOLLOWED BY A LEFT YAW. THE LOAD OF WATER WAS JETTISONED AND PILOTS PUSHED MAXIMUM BEEP ON BOTH ENGINES. THE NR 1 ENG WAS CARRYING THE LOAD. THE NR 2 ENG R
- [SDR 98ZZZX68](https://openairdocs.org/sdr/98ZZZX68.md): Case · cracked · Dec 9, 1997 · N178AC · Skrsky S64F · Turbine Section
  > WHILE INSTALLED, AFT FLANGE OF CASE SN 225 FRACTURED 360 DEGREES WITHIN THE FLANGE WELD JOINT. FRACTURING OF AFT FLANGE ASSY ELIMINATED THE AFT MOUNT FROM ENG SUPPORT. ENG FREE TO MOVE VERTICALLY, LATERALLY, AND FORE AND AFT, UNRESTRAINED BY AFT MOUNT. THIS
- [SDR 97ZZZX4464](https://openairdocs.org/sdr/97ZZZX4464.md): Bearing · failed · Sep 30, 1997 · Turbine Engine Compressor Section
  > BEARING REMOVED FROM ENG DURING OVERHAUL WITH TT OF 1691.6 HRS. DURING OVERHAUL, BEARING WAS INSPECTED AND 2 UNUSUAL CONDITIONS FOUND: BALLS EXHIBITED SEVERE SCRATCHES AND RETAINER SHOWED SMEARED SILVER PLATING IN THE BALL RETENTION AREA. AFTER ANALYSIS, R
- [SDR 970326](https://openairdocs.org/sdr/970326.md): Air Seal · cracked · Mar 13, 1997 · Turbine Engine Compressor Section
  > ON MARCH 13, 1997, COMPRESSOR ASSY S/N 677775 WAS SCHEDULED FOR AN OVERHAUL, W.O. NR 25419. TEAR DOWN WAS COMPLETED ON MARCH 14, 1997, WITH NO PROBLEMS. THE AIR SEAL ON THE REAR OF THE 7TH STAGE DISK WAS NOTED TO HAVE A CRACK COMPLETELY THROUGH IT AND ANOTH
- [SDR 97ZZZX853](https://openairdocs.org/sdr/97ZZZX853.md): Bevel Gearshaft · cracked · Feb 11, 1997 · Turbine Section
  > FOUND CRACK INDICATIONS DURING FMPI INSIDE SQUARE DRIVE OF GEARSHAFT. INDICATORS APPEAR SHARP. A WELL DEFINED CRACK-TYPE INDICATION IS SEEN INSIDE CORNERS OF SHAFT. OUTSIDE DIAMETER SHOWS BROAD FUZZY INDICATIONS THAT CORRESPOND DIRECTLY TO INSIDE INDICATIO
- [SDR 97ZZZX854](https://openairdocs.org/sdr/97ZZZX854.md): Bevel Gearshaft · cracked · Feb 11, 1997 · Turbine Section
  > FOUND CRACK INDICATIONS DURING FMPI INSIDE SQUARE DRIVE OF GEARSHAFT. INDICATORS APPEAR SHARP. A WELL DEFINED CRACK-TYPE INDICATION IS SEEN INSIDE CORNERS OF SHAFT. OUTSIDE DIAMETER SHOWS BROAD FUZZY INDICATIONS THAT CORRESPOND DIRECTLY TO INSIDE INDICATIO
- [SDR 97ZZZX855](https://openairdocs.org/sdr/97ZZZX855.md): Bevel Gearshaft · cracked · Feb 11, 1997 · Turbine Section
  > FOUND CRACK INDICATIONS DURING FMPI INSIDE SQUARE DRIVE OF GEARSHAFT. INDICATORS APPEAR SHARP. A WELL DEFINED CRACK-TYPE INDICATION IS SEEN INSIDE CORNERS OF SHAFT. OUTSIDE DIAMETER SHOWS BROAD FUZZY INDICATIONS THAT CORRESPOND DIRECTLY TO INSIDE INDICATIO
- [SDR 97ZZZX856](https://openairdocs.org/sdr/97ZZZX856.md): Bevel Gearshaft · cracked · Feb 11, 1997 · Turbine Section
  > FOUND CRACK INDICATIONS DURING FMPI INSIDE SQUARE DRIVE OF GEARSHAFT. INDICATORS APPEAR SHARP. A WELL DEFINED CRACK-TYPE INDICATION IS SEEN INSIDE CORNERS OF SHAFT. OUTSIDE DIAMETER SHOWS BROAD FUZZY INDICATIONS THAT CORRESPOND DIRECTLY TO INSIDE INDICATIO
- [SDR 96ZZZX5190](https://openairdocs.org/sdr/96ZZZX5190.md): Tablock · missing · Jun 25, 1996 · N178AC · Skrsky S64F · Turbine Engine Compressor Section
  > TABLOCK FOUND MISSING AT POST-FLIGHT INSPECTION ON 6-25-96. THE LAST OVERHAUL WAS PERFORMED BY SABRELINER. WHEN INSPECTING THE COMPRESSOR THROUGH THE INLET, CONTACT OF 3RD STAGE BLADE NOTED ON FACE OF 4TH STAGE STATOR NEAR CENTERLINE OF ENGINE (ROOT END OF B
- [SDR 96ZZZX5191](https://openairdocs.org/sdr/96ZZZX5191.md): Tablock · missing · Apr 26, 1996 · N178AC · Skrsky S64F · Turbine Engine Compressor Section
  > TABLOCK FOUND MISSING AT PRE-FLIGHT INSPECTION CONDUCTED ON 4-26-96. THE LAST OVERHAUL PERFORMED BY EAC ON 8-4-94. WHEN INSPECTING THE COMPRESSOR THROUGH THE INLET, CONTACT OF 3RD STAGE BLADE WAS NOTED ON FACE OF 4TH STAGE STATOR NEAR CENTERLINE OF ENGINE (R
- [SDR 96ZZZX5313](https://openairdocs.org/sdr/96ZZZX5313.md): Tablock · missing · Jan 26, 1996 · N159AC · Skrsky S64F · Turbine Engine Compressor Section
  > TABLOCK FOUND MISSING AT HIDDEN DAMAGE INSPECTION CONDUCTED ON COMPRESSOR BEING PROCESSED INTO THE REPAIR STATION ON 1-26-96. THE LAST OVERHAUL WAS PERFORMED BY EAC ON 8-4-94. WHEN INSPECTING THE COMPRESSOR THROUGH THE INLET, CONTACT OF 3RD STAGE BLADE NOTED
- [SDR 96ZZZX5192](https://openairdocs.org/sdr/96ZZZX5192.md): Tablock · missing · Dec 2, 1995 · N178AC · Skrsky S64F · Turbine Engine Compressor Section
  > ENGINE FAILED INTERNALLY AT FIRST LIFT-OFF OF THE DAY. TABLOCK FOUND MISSING 12-2-95. THE LAST OVERHAUL PERFORMED BY EAC ON 1-6-94. WHEN INSPECTING COMPRESSOR THROUGH INLET, CONTACT OF 3RD STAGE BLADE NOTED ON FACE OF 4TH STAGE STATOR NEAR CENTERLINE OF ENG
- [SDR 96ZZZX5193](https://openairdocs.org/sdr/96ZZZX5193.md): Tablock · missing · Aug 22, 1995 · N178AC · Skrsky S64F · Turbine Engine Compressor Section
  > ENGINE REMOVED FOR HSI. TABLOCK FOUND MISSING AT HIDDEN DAMAGE INSPECTION CONDUCTED ON COMPRESSOR BEING INDUCTED IN REPAIR STATION ON 8-22-95. THE LAST OVERHAUL PERFORMED BY EAC ON 10-7-94. WHEN INSPECTING COMPRESSOR THROUGH INLET, CONTACT OF 3RD STAGE BLAD
- [SDR 95ZZZX2154](https://openairdocs.org/sdr/95ZZZX2154.md): Disk · pitted · Jan 24, 1995 · Skrsky S64A · Turbine Engine Compressor Section
  > P AND W SB 1508, REQUIRES ALL ENGINES TO BE COMPLETELY DISASSEMBLED TO CONDUCT A CORROSION INSPECTION EVERY 7 YEARS. SERIOUS CORROSION PITTING FOUND WHEN CONVERTING MILITARY T73-P-1 OR T73-P-700 ENGINES TO COML. USE. DISK FAILURE CAN OCCUR IF CORROSION INSPE

## 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 engine_model_key = 'JFTD12A5A'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/pratt-whitney-jftd12a-5a/reports

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