# Pratt & Whitney JFTD12A-4A

- Type: Engine model (FAA registry)
- Registry code: 51502
- Manufacturer (registry): P & W
- Model: JFTD12A-4A
- Engine type: Turbo-shaft
- Power: 4,500 hp
- Data sheet: [TCDS E15EA](https://openairdocs.org/tcds/E15EA) (OpenAirDocs)
- Holder: Erickson Incorporated DBA Erickson Air-Crane
- Installed in: 12 registered aircraft
- Page: https://openairdocs.org/engine/pratt-whitney-jftd12a-4a

Model codes come from the FAA registry's reference file.

## ADs that may apply (OpenAirDocs)

Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 97-02-13](https://openairdocs.org/ad/97-02-13): Disk rupture · Pratt & Whitney Division JFTD12A-4A (T73P-1) and JFTD12A-5A (T73-P-700). Effective Apr 4, 1997
- [AD 71-24-05](https://openairdocs.org/ad/71-24-05): Compressor Rotor Discs · Pratt & Whitney Division JFTD12A-4A (T73P-1), JFTD12A-5A (T73-P-700), JT12A-6 and 2 more. Effective May 31, 1974

## Registered aircraft (12)

- [N172AC](https://openairdocs.org/aircraft/N172AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1968, S/N 64061
- [N173AC](https://openairdocs.org/aircraft/N173AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1967, S/N 64015
- [N176AC](https://openairdocs.org/aircraft/N176AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1962, S/N 64003
- [N189AC](https://openairdocs.org/aircraft/N189AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1997, S/N 641001
- [N217AC](https://openairdocs.org/aircraft/N217AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamlee, GA](https://openairdocs.org/faa-place/GA/Chamlee), built 1968, S/N 64064
- [N243AC](https://openairdocs.org/aircraft/N243AC): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1967, S/N 64022
- [N615HX](https://openairdocs.org/aircraft/N615HX): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1968, S/N 64065
- [N6962R](https://openairdocs.org/aircraft/N6962R): [Helicopter Express LLC](https://openairdocs.org/faa-owner/HELICOPTER%20EXPRESS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1968, S/N 64058
- [N792HT](https://openairdocs.org/aircraft/N792HT): [U S Leasco Inc](https://openairdocs.org/faa-owner/U%20S%20LEASCO%20INC), [Aurora, OR](https://openairdocs.org/faa-place/OR/Aurora), built 1968, S/N 68-18447
- [N793HT](https://openairdocs.org/aircraft/N793HT): [U S Leaseco Inc](https://openairdocs.org/faa-owner/U%20S%20LEASECO%20INC), [Aurora, OR](https://openairdocs.org/faa-place/OR/Aurora), built 1967, S/N 67-18427
- [N795HT](https://openairdocs.org/aircraft/N795HT): [U S Leaseco Inc](https://openairdocs.org/faa-owner/U%20S%20LEASECO%20INC), [Aurora, OR](https://openairdocs.org/faa-place/OR/Aurora), built 1968, S/N 6818458
- [N9125M](https://openairdocs.org/aircraft/N9125M): [Siller Helicopters LLC](https://openairdocs.org/faa-owner/SILLER%20HELICOPTERS%20LLC), [Chamblee, GA](https://openairdocs.org/faa-place/GA/Chamblee), built 1968, S/N 68-18455

## NTSB investigations (5)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC26FA079](https://openairdocs.org/ntsb/ANC26FA079), Aug 7, 2026: Helicopter Transport Services CH-54A (N793HT), Cove Fort, UT, destroyed, 2 fatal, investigation ongoing
- [NTSB WPR19WA147](https://openairdocs.org/ntsb/WPR19WA147), Jan 28, 2019: Sikorsky S64 (N173AC), Mount Eliza, Australia, substantial damage
- [NTSB LAX07TA001](https://openairdocs.org/ntsb/LAX07TA001), Oct 1, 2006: Erickson S64E (N189AC), Ojai, CA, substantial damage. Probable cause: The pilot-in-command's improper remedial action, which resulted in a loss of helicopter control. Contributing factors were the retardant tank and snorkel designs.
- [NTSB LAX00LA018](https://openairdocs.org/ntsb/LAX00LA018), Oct 16, 1999: Sikorsky CH-54A (N9125M), Elko, NV, no damage, 1 fatal. Probable cause: the flight engineer's decision to climb a step ladder that put him in close proximity to the still turning main rotor blades. The gusting wind was a factor in the accident.
- [NTSB MIA71FKD01](https://openairdocs.org/ntsb/MIA71FKD01), Jul 3, 1970: Sikorsky S-64E (N6962R), Union City, TN, substantial damage

## FAA accident and incident reports (6)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20260807010199A](https://openairdocs.org/incident/20260807010199A), Aug 7, 2026: Helicopter Transport Svc LLC CH-54A (N793HT), Richfield, UT, Destroyed, 2 fatal. During part 133 firefighting flight. [privacy data omitted] Arrived from the northwest flying over the targeted drop zone. While maneuvering in a right turn…
- [Incident 20200509010389I](https://openairdocs.org/incident/20200509010389I), May 9, 2020: Sikorsky S-64E (N172AC), Mcleod, OR, No damage. During sea snorkeling operations at lost creek lake, the pilot in command was distracted by an abnormal indication on the water quantity instrument located in…
- [Accident 20061001019979A](https://openairdocs.org/incident/20061001019979A), Oct 1, 2006: Skrsky S64E (N189AC), CA, Substantial damage. (-23) On Sunday October 1st 2006, an exclusive use erickson air-crane S-64 helicopter, N189AC, operated by erickson air-crane of central point, Oregon, had…
- [Incident 20020714034489I](https://openairdocs.org/incident/20020714034489I), Jul 14, 2002: Skrsky S64E (N189AC), Bishop, CA, Substantial damage. (-23) The safecom report was generated by the U.S. Forest service and conveyed that a model 64E helicopter, N189AC, was engaged in water drops on the Piper…
- [Incident 20020207002059I](https://openairdocs.org/incident/20020207002059I), Feb 7, 2002: Skrsky S64E (N173AC), Applegate, OR. (-23) This aircraft was engaged in logging operations, by erickson air crane, inc., E8KL, near Applegate lake in southwest Oregon. The PIC made a precautionary…
- [Accident 19991016029129A](https://openairdocs.org/incident/19991016029129A), Oct 16, 1999: Skrsky CH54A (N9125M), Elko, NV, 1 fatal. (.19) On October 16, 1999, at 1410 hours pacific daylight time, a Sikorsky CH-54A, N9125M, was shutting down at Elko, Nevada, when a crewmember was struck by a…

## Service difficulty reports (108, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR JYDR20231019286](https://openairdocs.org/sdr/JYDR20231019286), Oct 18, 2023: BLADE. BROKEN. AIRCRAFT WAS FIREFIGHTING WHEN PILOTS HEARD A LOW FREQUENCY RUMBLE. AIRCRAFT RETURNED TO BASE FOR TROUBLESHOOTING. AFTER TROUBLESHOOTING AMTS FOUND 1 EA. 2ND ST
- [SDR JYDR20220406093](https://openairdocs.org/sdr/JYDR20220406093), Apr 4, 2022: NONE. BROKEN. AIRCRAFT WAS ON FERRY FLIGHT WHEN PILOT NOTICED LOSS OF OIL PRESSURE ON NUMBER 2 ENGINE. LARGE AMOUNT OF OIL ON RIGHT SIDE OF AIRCRAFT. ENGINE SHUT DOWN IN FLIG
- [SDR JYDR20220214044](https://openairdocs.org/sdr/JYDR20220214044), Feb 13, 2022: TURBINE BLADES. BROKEN. AIRCRAFT WAS LOGGING. PILOTS FELT VIBRATION FROM #2 ENGINE AND RETURNED TO SERVICE LANDING. WHEN SHUT DOWN ENGINE CAME TO A SUDDEN STOP AND LOCKED UP. WHEN FREE
- [SDR JYDR20220120016](https://openairdocs.org/sdr/JYDR20220120016), Jan 19, 2022: NONE. BROKEN. WHILE LANDING FROM A HOVER, AS THE WHEELS TOUCHED DOWN A VIBRATION WAS FELT. PILOTS PULLED EACH ENGINE BACK SEPARATELY AND FOUND VIBRATION COMING FROM #2 ENGINE
- [SDR JYDR20210715194](https://openairdocs.org/sdr/JYDR20210715194), Jul 14, 2021: ENGINE. OVERTEMP. SHORT FINAL FOR WATER DROP. PILOT HEARD LOUD WOOSH SOUND FOLLOWED BY ROLLBACK CONDITIONS, 65% CHIME, 60% WARNING T5 RISING, N1 DROPPING. AIRCRAFT LANDED AT FIRS
- [SDR JYDR20210715184](https://openairdocs.org/sdr/JYDR20210715184), Jul 13, 2021: ENGINE. OVERTEMP. SHORT FINAL FOR WATER DROP. PILOT RECEIVED 65% CHIME THEN 60% WARNING. ENGINE SECURED AND AIRCRAFT RETURNED TO BASE SINGLE ENGINE. THIS IS A PRELIMINARY REPORT 
- [SDR JYDR20210615165](https://openairdocs.org/sdr/JYDR20210615165), Jun 14, 2021: BLADE. BROKEN. AIRCRAFT PERFORMING LOGGING OPERATIONS. PILOTS FELT VIBRATION AND NOISE. ENGINE SHUT DOWN IN FLIGHT, AIRCRAFT RETURNED TO LANDING AREA. MAINTENANCE FOUND DEBRIS
- [SDR JYDR20210429](https://openairdocs.org/sdr/JYDR20210429), Apr 29, 2021: BLADE. BROKEN. AT SHUTDOWN PILOTS FELT VIBRATION AND HEARD NOISE. UPON INSPECTION MAINTENANCE FOUND INTERNAL FOD IN TAILPIPE. AFTER REMOVING ENGINE, MAINTENANCE FOUND 2ND STAG
- [SDR JYDR20201008272](https://openairdocs.org/sdr/JYDR20201008272), Oct 7, 2020: BLADES. BROKEN. PILOTS HEARD A NOISE COMING FROM NR 2 ENGINE AND RETURNED TO SERVICE LANDING. MAINTENANCE FOUND DEBRIS IN TAIL PIPE. ENGINE REMOVED AND IS BEING SHIPPED BACK TO
- [SDR JYDR20200420109](https://openairdocs.org/sdr/JYDR20200420109), Apr 19, 2020: TURBINE BLADES. BROKEN. DURING RE-FUELING PILOT REPORTED A STRANGE ENGINE NOISE. AFTER SHUTDOWN MECHANICS FOUND A SECOND STAGE N1 BLADE HAD BROKEN AND EXITED THROUGH THE FREE TURBINE. 
- [SDR JYDR20190423081](https://openairdocs.org/sdr/JYDR20190423081), Apr 22, 2019: TURBINE BLADES. BROKEN. ENGINE RECEIVED AT REPAIR STATION FOR REPAIR. FOUND 1 EACH 2ND STAGE N1 BLADE BROKEN AT ROOT. UNKNOWN CAUSE AT THIS TIME BECAUSE THIS REPORT MUST BE SUBMITTED F
- [SDR JYDR20190124023](https://openairdocs.org/sdr/JYDR20190124023), Jan 23, 2019: DISK. CRACKED. ENGINE WAS AT REPAIR STATION FOR OVERHAUL. NDT WAS COMPLIED WITH ON THE 3RD STAGE DISK REFERENCE OIS 352 REV N, 3/3/2015. 7EA. CRACK INDICATIONS WERE FOUND FROM
- [SDR JYDR20190107007](https://openairdocs.org/sdr/JYDR20190107007), Jan 7, 2019: TAB. BROKEN. ENGINE WAS AT REPAIR STATION FOR SCHEDULED OVERHAUL. DURING TEAR DOWN A BROKEN TAB LOCK WAS DISCOVERED ON THE 4TH STAGE COMPRESSOR DISK. THIS CAUSED THE 4TH STA
- [SDR JYDR20181214347](https://openairdocs.org/sdr/JYDR20181214347), Dec 13, 2018: DISK. CRACKED. ENGINE WAS RECEIVED AT REPAIR STATION FOR HOT SECTION AND AIRWORTHINESS COMPLIANCE (AD) UNDER WO 164822. DURING COMPLIANCE WITH AD 97-02-13 NDT INSPECTION, 2 EA
- [SDR JYDR20181130332](https://openairdocs.org/sdr/JYDR20181130332), Nov 28, 2018: BLADES. BROKEN. THIS IS A PRELIMINARY REPORT TO MEET REPORTING REQUIREMENTS. THE ENGINE IS CURRENTLY BEING SHIPPED TO THIS REPAIR STATION FROM CANADA. MORE INFORMATION WILL BE 
- [SDR JYDR20170628176](https://openairdocs.org/sdr/JYDR20170628176), Jun 27, 2017: TURBINE BLADES. MISSING. PILOT RETURNED TO LANDING REPORTING NOISE AND VIBRATION IN NR 1 ENGINE. AFTER SEPARATING FREE TURBINE FROM ENGINE DISCOVERED ONE EACH SECOND STAGE N1 TURBINE BL
- [SDR JYDR20170428115](https://openairdocs.org/sdr/JYDR20170428115), Apr 28, 2017: BLADE. CRACKED. ENGINE AT REPAIR STATION FOR OVERHAUL. DURING FPI INSPECTION A CRACK WAS DETECTED ON INBOARD SIDE OF PLATFORM ON DOVE TAIL. CRACK WAS APPROXIMATELY .025 INCH IN
- [SDR JYDR20170306065](https://openairdocs.org/sdr/JYDR20170306065), Mar 6, 2017: BOLT. BROKEN. DURING POST FLIGHT, MECHANIC FOUND A DING IN THE LEADING EDGE OF 1 TAIL ROTOR BLADE. FURTHER INSPECTION REVEALED A BROKEN STABILIZER BOLT HEAD. TRB WAS REPLACED
- [SDR JYDR20170321001](https://openairdocs.org/sdr/JYDR20170321001), Jan 1, 2017: GEARBOX. FAILED. DURING A NORMAL START PROCEDURE, WITH THE NR 1 ENGINE AT GROUND IDLE AND JUST PRIOR TO THE ROTOR BRAKE BEING RELEASED, A FAILURE OCCURRED IN THE MAIN GEARBOX TH
- [SDR JYDR20161128318](https://openairdocs.org/sdr/JYDR20161128318), Nov 28, 2016: BLADE. UNBONDED. TAIL ROTOR BLADE CAUSED VIBRATION ON AIRCRAFT. UPON DISASSEMBLY AT REPAIR STATION, A LARGE AMOUNT OF WATER WAS FOUND IN THE FAIRING. THE WATER WAS ALLOWED ENTRY
- [SDR JYDR20150814209](https://openairdocs.org/sdr/JYDR20150814209), Aug 13, 2015: LOCK TAB. MISSING. DURING INSPECTION OF COMPRESSOR CORE IT WAS NOTED THAT ONE 5TH STAGE BLADE TAB LOCK WAS MISSING AND THAT BLADE HAD MOVED AFT IN THE DISK MAKING CONTACT WITH THE
- [SDR JYDR20150611153](https://openairdocs.org/sdr/JYDR20150611153), Jun 11, 2015: RING GEAR. LOOSE. MAIN GEAR BOX WAS RECEIVED FOR OVERHAUL. DURING DISASSEMBLY IT WAS FOUND THAT 1EA NUT, MS14182P06 HAD BACKED OFF OF 1EA BOLT MS14181-06010P THAT HOLDS THE SECON
- [SDR JYDR20150408085](https://openairdocs.org/sdr/JYDR20150408085), Apr 7, 2015: TURBINE. LOOSE. FREE TURBINE ASSY WAS AT REPAIR STATION FOR A LEAK REPAIR. DURING DISASSEMBLY THE NUT THAT HOLDS THE 6435-20072-101 DRIVE FLANGE WAS FOUND TO BE LOOSE. FURTHER 
- [SDR JYDR2014030600439](https://openairdocs.org/sdr/JYDR2014030600439), Mar 6, 2014: BEARING. SPALLED. MAIN GEAR BOX WAS REMOVED FROM ACFT, DUE TO MAKING METAL AFTER A CHIP LIGHT DURING FLIGHT. DISASSEMBLY OF MGB AT REPAIR STATION REVEALED THAT LT (NR 1) 2ND STAG
- [SDR JYDR2013FA0000586](https://openairdocs.org/sdr/JYDR2013FA0000586), Oct 3, 2013: LOCK TAB. BROKEN. DURING TEARDOWN OF THE COMPRESSOR CORE THERE WAS EXTENSIVE DAMAGE TO BLADES AND VANES FROM THE 3RD STAGE AFT. THE DAMAGE OCCURED WHEN THE AFT END OF A 3RD STAGE
- [SDR JYDR2013FA0000420](https://openairdocs.org/sdr/JYDR2013FA0000420), Jul 26, 2013: COMPRESSOR WHEEL. CRACKED. COMPRESSOR WAS BEING OVERHAULED. DURING NDT CRACKS WERE FOUND AT THE TIE ROD HOLES.
- [SDR JYDR2013FA0000421](https://openairdocs.org/sdr/JYDR2013FA0000421), Jul 26, 2013: COMPRESSOR WHEEL. CRACKED. COMPRESSOR WAS BEING OVERHAULED. DURING NDT CRACKS WERE FOUND AT THE TIE ROD HOLES.
- [SDR 2013FA0000416](https://openairdocs.org/sdr/2013FA0000416), Jul 18, 2013: LOCK. BROKEN. ENGINE REMOVED, DURING DISASSEMBLY MINOR DAMAGE WAS NOTED ON THE BLADES AND VANES AFT IF 5TH STAGE. THE DAMAGE WAS CAUSED BY A 5TH STAGE DISK TAB LOCK THAT HAD 
- [SDR 2011FA0000703](https://openairdocs.org/sdr/2011FA0000703), Aug 29, 2011: BLADE. CRACKED. AT FIRST BIM CHECK, PILOTS REPORTED HEARING A CHIRPING NOISE COMING FROM THE MAIN ROTOR BLADES. INSPECTED BLADES. FOUND THE TIP WEIGHT ON MAIN ROTOR BLADE PROTR
- [SDR 2011FA0000704](https://openairdocs.org/sdr/2011FA0000704), Jun 10, 2011: BLADES. FRACTURED. AFTER ABOUT 1.5 HRS OF FLIGHT, THE PILOTS RETURNED TO LANDING AND SAID THAT THE NR1 ENGINE HAD A HIGH FREQUENCY RUMBLE AND JUST BEFORE LANDING, THE TQ AND EPR G
- [SDR CA100323004](https://openairdocs.org/sdr/CA100323004), Mar 8, 2010: ENGINE. FAILED. ACFT WAS INVOLVED IN AERIAL TIMBER HARVESTING OPERATIONS . WHILE THE ACFT WAS DESCENDING TO THE LOG LANDING AT A RATE OF 200 TO 300 FT PER MINUTE AND AN AIRPSEE
- [SDR CA100119008](https://openairdocs.org/sdr/CA100119008), Jan 15, 2010: BLADE. DISLODGED. (CAN) COMPRESSOR WAS REMOVED FROM ACFT FOR HIGH VIBRATION. COMPRESSOR HAD 20.3 HOURS SINCE INSTALL AND LAST HOT SECTION INSP. UPON DISASSEMBLY, DAMAGE WAS FOUND
- [SDR CA080925006](https://openairdocs.org/sdr/CA080925006), Sep 8, 2008: ENGINE. MALFUNCTIONED. (CAN) WHILE DEPARTING AREA WITH AN AIRSPEED OF 30 TO 40 KNOTS AND A 500 FT PER MINUTE RATE OF DESCENT, NR 2 ENGINE N1 LOW RPM AUDIO HORN SOUNDED ALONG WITH ILLU
- [SDR CA080925007](https://openairdocs.org/sdr/CA080925007), Sep 8, 2008: FUEL CONTROL. FAILED. (CAN) LIGHT A SCAN OF THE ENG GAUGES REVEALED THE NR 2 ENGINE HAD LOW N1 RPM WITH A CLIMBING T5 TEMP. FLIGHT CREW IDENTIFIED THE PROBLEM AS AN ENG ROLL BACK AND
- [SDR CA081105002](https://openairdocs.org/sdr/CA081105002), Sep 8, 2008: ENGINE. OVERTEMP. (CAN) WHILE DEPARTING AREA WITH AN AIRSPEED OF 30 TO 40 KNOTS AND A 500 FT PER MINUTE RATE OF DESCENT, NR 2 ENG N1 LOW RPM AUDIO HORN SOUNDED ALONG WITH ILLUMIN
- [SDR CA080530001](https://openairdocs.org/sdr/CA080530001), May 29, 2008: SERVO. LOOSE. (CAN) DURING A POST-FLIGHT INSP, MECHANIC FOUND MOVEMENT BETWEEN THE FORK AND PISTON. THE PRIMARY SERVO WAS REPLACED. AFTER DISASSEMBLY AT REPAIR STATION, IT WA
- [SDR H3V2007F00000](https://openairdocs.org/sdr/H3V2007F00000), Jul 8, 2007: PIN. MISSING. ON JULY 8, 2007, HLH EXPERIENCED A HARD GROUND ROLLOVER OF AC. INITIAL INSPECTION OF THE WRECKAGE REVEALED A SERVO PIN, PN 6465-20201-101, FROM THE LT LATERAL S
- [SDR CA061218007](https://openairdocs.org/sdr/CA061218007), Dec 2, 2006: OIL SYSTEM. MALFUNCTIONED. (CAN) THE AIRCRAFT WAS INVOLVED IN HELICOPTER LOGGING OPERATIONS. AS THE AIRCRAFT WAS APPROACHING THE LOG LANDING WITH A LOAD, THE FLIGHT CREW WERE ALERTED BY A
- [SDR CA061218010](https://openairdocs.org/sdr/CA061218010), Nov 21, 2006: BOLT. DAMAGED. (CAN) THE AIRCRAFT WAS INVOLVED IN HELICOPTER LOGGING OPERATIONS. THE YARDING PROFILE WAS A DOWN HILL FLIGHT FROM THE HARVEST CUT BLOCK TO A ROAD SIDE LOG LANDI
- [SDR 2006FA0001137](https://openairdocs.org/sdr/2006FA0001137), Nov 6, 2006: TURBINE BLADES. FRACTURED. (REF NR: MDR06-092) VIBRATION FELT BY CREW, UPON LANDING, MAINTENANCE PERSONNEL FOUND METAL PARTICLES IN NR 2 ENGINE EXHAUST. UPON CLOSER EXAMINATION, A 2ND STA
- [SDR CA061018003](https://openairdocs.org/sdr/CA061018003), Oct 10, 2006: ROD. BROKEN. (CAN) THE AIRCRAFT WAS INVOLVED IN AERIAL LOGGING OPERATIONS AND HAD JUST SHUT DOWN FOR IT’S MIDDAY MAINTENANCE. THIS MAINTENANCE INVOLVES A FLUID LEVELS CHECK,
- [SDR CA061011013](https://openairdocs.org/sdr/CA061011013), Oct 7, 2006: TURBINE BLADES. BROKEN. (CAN) THE AIRCRAFT WAS INVOLVED IN AERIAL LOGGING OPERATIONS, ON A SHORT FINAL APPROACH TO THE LOG LANDING THE AIRCRAFT DEVELOPED A VERY NOTICEABLE HIGH FREQUEN
- [SDR 2006FA0001135](https://openairdocs.org/sdr/2006FA0001135), Oct 6, 2006: BEARING. CRACKED. (REF NR:MDR06-090) MAIN GEARBOX PN 6435-20400065, SN A6-011 WAS REMOVED DUE TO FINDINGS OF FERROUS METAL IN THE OIL SCREEN AND FILTER. UPON DISASSEMBLY AND TEAR
- [SDR 2006FA0001136](https://openairdocs.org/sdr/2006FA0001136), Oct 6, 2006: BEARING. CRACKED. (REF NR MDR06-089) THE IGB CHIP DETECTOR INDICATED A CHIP LIGHT. IGB WAS REMOVED AND THE INNER RACE WAS FOUND TO BE CRACKED THROUGH AND SPALLED. PROBABLE CAUSE:
- [SDR CA060704011](https://openairdocs.org/sdr/CA060704011), Jun 28, 2006: FUEL CONTROL. FAILED. (CAN) AFTER SETTING A TURN OF LOGS DOWN ON LOG LANDING WITH A LT CROSS WIND, ACFT TURNED FULLY INTO WIND & BEGAN A CLIMB BACK UP HILL TO LOGGING UNIT WITH APPRO
- [SDR CA060621001](https://openairdocs.org/sdr/CA060621001), Jun 15, 2006: ENGINE. FAILED. A/C INVOLVED IN HELI-LOGGING OPS WITH A/C IN HOVER MADE A MODERATE PWR REDUCTION TO REPOSITION GRAPPLE ON A LOG. AS PWR WAS REDUCED A "WHOOSH" SOUND WAS HEARD A
- [SDR 2006FA0000795](https://openairdocs.org/sdr/2006FA0000795), May 24, 2006: SPAR. CRACKED. (REF NR: MDR06-088) IB SIDE OF SPAR ON TRAILING EDGE HAS A CRACK. THE CRACK IS APPROX .482 INCH LONG AND RUNS FROM TIP END OF BLADE, DOWN INTO THE SCREW HOLE CO
- [SDR CA051102003](https://openairdocs.org/sdr/CA051102003), Oct 29, 2005: ENGINE. FAILED. (CAN) AFTER SLIGHT REDUCTION IN PWR SETTING PILOT HEARD A WHOOSH SOUND FOLLOWED BY N1 LOW RPM AUDIO WARNING HORN. CO-PILOT IDENTIFIED NR1 ENG IN A ROLLBACK COND
- [SDR CA051102002](https://openairdocs.org/sdr/CA051102002), Oct 27, 2005: FUEL CONTROL. FAILED. (CAN) PILOT ELECTED TO BACK AC OUT AWAY FROM LOG LANDING. AS AC STARTED ITS REARWARD DESCENT DOWN TO LOGGING BLOCK, PILOT HEARD WHOOSH SOUND FOLLOWED BY AN ENG 
- [SDR CA051013004](https://openairdocs.org/sdr/CA051013004), Sep 23, 2005: CLAMP. MISINSTALLED. (CAN) DURING GROUND RUN PHASE OF MAIN GB REPLACEMENT, NR 2 GEN VESPAL DRIVE SPLINE ADAPT STRIPPED OUT CAUSING GEN TO FALL OFF LINE. GEN WAS REMOVED FROM ACCY GB

All 108: https://openairdocs.org/engine/pratt-whitney-jftd12a-4a/reports.md

## PMA parts (OpenAirDocs) (346, first 50)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first.

- [80888TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID196237341020260616140917.0001): Gear, Driver – Control. Source Manufacturing Inc · PMA PQ1549CE · Replaces 80888 · Apr 10, 2026
- [745112TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194317500420260616140917.0001): Rivet–Split, Fillister. Source Manufacturing Inc · PMA PQ1549CE · Replaces 745112 · Apr 10, 2026
- [790450TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194257482820260616140919.0001): Bearing, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 790450 · Apr 10, 2026
- [417637TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID192285882020260616140920.0001): Gearshaft, Main Oil Pump. Source Manufacturing Inc · PMA PQ1549CE · Replaces 417637 · Apr 10, 2026
- [659330CL1TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID190668690320260616140918.0001): Counterweight. Source Manufacturing Inc · PMA PQ1549CE · Replaces 659330CL1 · Apr 10, 2026
- [71080TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189780568720260616140915.0001): Washer, Key. Source Manufacturing Inc · PMA PQ1549CE · Replaces 71080 · Apr 10, 2026
- [560890TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID188247252220260616140913.0001): Seal, Air – 1st Stage Turbine. Source Manufacturing Inc · PMA PQ1549CE · Replaces 560890 · Apr 10, 2026
- [501267TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID184063503120260616140919.0001): Ring, Retaining. Source Manufacturing Inc · PMA PQ1549CE · Replaces 501267 · Apr 10, 2026
- [370915TMT, 370915-05TMT, 370915-10TMT, 370915-15TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID182531854620260616140912.0001): Spacer, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 370915 · Apr 10, 2026
- [406123TMT, 406123-05TMT, 406123-10TMT, 406123-15TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID180036331320260616140913.0001): Spacer, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 406123 · Apr 10, 2026
- [491975TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID179798830320260616140915.0001): Washer. Source Manufacturing Inc · PMA PQ1549CE · Replaces 491975 · Apr 10, 2026
- [446-3-90TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID178360562220260616140916.0001): Screw, Machine – Flathead. Source Manufacturing Inc · PMA PQ1549CE · Replaces 446-3-90 · Apr 10, 2026
- [575188TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID176624874620260616140920.0001): Seal, Air – Free Turbine Inlet. Source Manufacturing Inc · PMA PQ1549CE · Replaces 575188 · Apr 10, 2026
- [426273TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID176409759220260616140917.0001): Seal Ring. Source Manufacturing Inc · PMA PQ1549CE · Replaces 426273 · Apr 10, 2026
- [406119TMT, 406119-05TMT, 406119-10TMT, 406119-15TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID175682255220260616140912.0001): Spacer, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 406119 · Apr 10, 2026
- [501268TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID169474205220260616140919.0001): Ring, Retaining. Source Manufacturing Inc · PMA PQ1549CE · Replaces 501268 · Apr 10, 2026
- [80890TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167266528020260616140917.0001): Shaft, Control Drive Gear. Source Manufacturing Inc · PMA PQ1549CE · Replaces 80890 · Apr 10, 2026
- [390940TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID166143657520260616140915.0001): Gearshaft, Main Oil Pump. Source Manufacturing Inc · PMA PQ1549CE · Replaces 390940 · Apr 10, 2026
- [586986TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID157738458620260616140910.0001): Valve, Fuel Dump. Source Manufacturing Inc · PMA PQ1549CE · Replaces 586986 · Apr 10, 2026
- [388505TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID155399131420260616140914.0001): Adjuster Housing. Source Manufacturing Inc · PMA PQ1549CE · Replaces 388505 · Apr 10, 2026
- [373221TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID155001386020260616140910.0001): Plug, Guide. Source Manufacturing Inc · PMA PQ1549CE · Replaces 373221 · Apr 10, 2026
- [370779TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID153540178020260616140911.0001): Washer, Key. Source Manufacturing Inc · PMA PQ1549CE · Replaces 370779 · Apr 10, 2026
- [586987TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID153079269020260616140911.0001): Strip, Extension – Fuel Dump Valve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 586987 · Apr 10, 2026
- [695847TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID148803224420260616140914.0001): Stator, Fuel Nozzle. Source Manufacturing Inc · PMA PQ1549CE · Replaces 695847 · Apr 10, 2026
- [659330CL2TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID147446137020260616140918.0001): Counterweight. Source Manufacturing Inc · PMA PQ1549CE · Replaces 659330CL2 · Apr 10, 2026
- [394708TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID147428463920260616140919.0001): Gasket. Source Manufacturing Inc · PMA PQ1549CE · Replaces 394708B · Apr 10, 2026
- [397229TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID143631943920260616140911.0001): Spring, Helical Compression. Source Manufacturing Inc · PMA PQ1549CE · Replaces 397229 · Apr 10, 2026
- [384240TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID140794862620260616140909.0001): Liner. Source Manufacturing Inc · PMA PQ1549CE · Replaces 384240 · Apr 10, 2026
- [587509TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID133473561820260616140920.0001): Seal, Air – Free Turbine Rotor. Source Manufacturing Inc · PMA PQ1549CE · Replaces 587509 · Apr 10, 2026
- [673000TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID131823038620260616140918.0001): Plug. Source Manufacturing Inc · PMA PQ1549CE · Replaces 673000 · Apr 10, 2026
- [431579TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID127677931820260616140913.0001): Coupling. Source Manufacturing Inc · PMA PQ1549CE · Replaces 431579 · Apr 10, 2026
- [80904TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID126014310520260616140916.0001): Washer, Thrust. Source Manufacturing Inc · PMA PQ1549CE · Replaces 80904 · Apr 10, 2026
- [668736TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125327944020260616140920.0001): Gearshaft. Source Manufacturing Inc · PMA PQ1549CE · Replaces 668736 · Apr 10, 2026
- [370917TMT, 370917-05TMT, 370917-10TMT, 370917-15TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125200865820260616140912.0001): Spacer, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 370917 · Apr 10, 2026
- [545073TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID120704003420260616140914.0001): Adjuster. Source Manufacturing Inc · PMA PQ1549CE · Replaces 545073 · Apr 10, 2026
- [71078TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID119886479520260616140913.0001): Impeller Assembly, Shaft and Pin. Source Manufacturing Inc · PMA PQ1549CE · Replaces 71078 · Apr 10, 2026
- [419881TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID119326239520260616140918.0001): Bolt. Source Manufacturing Inc · PMA PQ1549CE · Replaces 419881 · Apr 10, 2026
- [407395TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID117839264120260616140915.0001): Washer, Key. Source Manufacturing Inc · PMA PQ1549CE · Replaces 407395 · Apr 10, 2026
- [406102TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID114716142420260616140920.0001): Gasket, Valve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 406102B · Apr 10, 2026
- [49902TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID107187630520260616140915.0001): Gear, Impeller Driven. Source Manufacturing Inc · PMA PQ1549CE · Replaces 49902 · Apr 10, 2026
- [384249TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID106832901220260616140910.0001): Valve Assembly. Source Manufacturing Inc · PMA PQ1549CE · Replaces 384249 · Apr 10, 2026
- [414471TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID106828924920260616140916.0001): Pin. Source Manufacturing Inc · PMA PQ1549CE · Replaces 414471 · Apr 10, 2026
- [586989TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID104968989020260616140911.0001): Spring, Garter – Fuel Dump Valve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 586989 · Apr 10, 2026
- [394809TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID104597897620260616140914.0001): Spacer Seal. Source Manufacturing Inc · PMA PQ1549CE · Replaces 394809 · Apr 10, 2026
- [370916TMT, 370916-05TMT, 370916-10TMT, 370916-15TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100260108120260616140912.0001): Spacer, Sleeve. Source Manufacturing Inc · PMA PQ1549CE · Replaces 370916 · Apr 10, 2026
- [80884TMT](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100162069420260616140916.0001): Shaft, Main Drive. Source Manufacturing Inc · PMA PQ1549CE · Replaces 80884 · Apr 10, 2026
- [575183](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID113978756220250926210552.0001): Seal – Air  Free Turbine,       2-Stage. Able Aerospace Services, Inc. · PMA PQ2487NM · Replaces 575183 · Aug 26, 2025
- [544180SMI](https://drs.faa.gov/browse/excelExternalWindow/E105A386FAD257298625847400613394.0001): Cam Seal. Source Manufacturing Inc · PMA PQ1549CE · Replaces 544180 · Dec 22, 2018
- [332060AA](https://drs.faa.gov/browse/excelExternalWindow/F990FC5037493FB5862580CE00749166.0001): Bolt. Able Aerospace Services, Inc. · PMA PQ2487NM · Replaces 332060 · Feb 1, 2017
- [370211AA](https://drs.faa.gov/browse/excelExternalWindow/F23F8CE181A9172686257FAE006ADEE6.0001): Retaining Ring. Able Engineering and Component Services, Inc. · PMA PQ2487NM · Replaces 370211 · Feb 1, 2017

All of them: https://openairdocs.org/engine/pratt-whitney-jftd12a-4a/pma.md

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