# JASC 8520: Reciprocating Engine Power Section - Type: JASC system/component code (FAA) - ATA chapter: 85 Reciprocating Engine - Title in the code table: RECIPROCATING ENGINE POWER SECTION - Service difficulty reports: 2,213 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=71 - Page: https://openairdocs.org/jasc/8520 ## What it covers The section which contains the crankshaft, cam shaft, tappet guides, valve lifters, connecting rods, drive gears, etc. Does not include the push rods which are filed in the cylinder section in JASC code 8530 or rear case accessory drives. Typical parts are crankcase, crankshaft, cam ring, lifter, camshaft, cylinder stud, connecting rod, bolt, through bolt, cap, rod bolt, main bearing, rod bearing, etc. ## Service difficulty reports (2,213, newest 50) - [SDR 2026FA0000818](https://openairdocs.org/sdr/2026FA0000818), Oct 6, 2026: Cirrus SR22. DRIVE GEAR. SPALLED. FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 AL - [SDR 2026FA0000807](https://openairdocs.org/sdr/2026FA0000807), Oct 1, 2026: Cirrus SR22T. DRIVE GEAR. SPALLED. FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 AL - [SDR 2026FA0000820](https://openairdocs.org/sdr/2026FA0000820), Sep 24, 2026: Cirrus SR22. DRIVE GEAR. SPALLED. FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 AL - [SDR 8TNC202609060001](https://openairdocs.org/sdr/8TNC202609060001), Sep 6, 2026: Piper PA32301. CASE. CRACKED. THIS ENGINE HAS BEEN REMOVED FROM SERVICE DUE TO A CRACK ON THE RT SIDE OF THE CASE BELOW THE NR 3 CYLINDER AT THE FORWA (N81052) - [SDR 2026FA0000817](https://openairdocs.org/sdr/2026FA0000817), Jul 15, 2026: Cirrus SR22T. DRIVE GEAR. SPALLED. FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 AL - [SDR 2026FA0000819](https://openairdocs.org/sdr/2026FA0000819), Apr 29, 2026: Cirrus SR22T. DRIVE GEAR. SPALLED. FACE GEAR DAMAGED, ENGINE HAS EXHIBITED DAMAGE TO THE ALTERNATOR DRIVE FACE GEAR (P/N 657984), WHICH DRIVES THE NO. 1 AL - [SDR 8HBR20260426081](https://openairdocs.org/sdr/8HBR20260426081), Apr 23, 2026: Cessna 152. PLUG. WORN. WHILE COMPLYING WITH LYCOMING SB667A, ONE WRIST PIN PLUG ON CYLINDER #2 WAS FOUND EXCESSIVELY WORN WITH A HOLE IN THE CE (N89312) - [SDR 2026FA0000214](https://openairdocs.org/sdr/2026FA0000214), Mar 25, 2026: Cessna 172M. BUSHING SLEEVE. MIGRATED. FOUND BRONZE PARTICLES IN FULL FLOW FILTER AT INSPECTION. TRACED TO MIGRATING CONNECTING ROD BUSHINGS ON ALL 4 RODS (N1470) - [SDR NX422026031600013](https://openairdocs.org/sdr/NX422026031600013), Mar 13, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANKCASE HALF ON ALL FOUR THRU STUD BORE LOC (N923ER) - [SDR NX422026031600012](https://openairdocs.org/sdr/NX422026031600012), Mar 13, 2026: Cessna 172S. STUD. DAMAGED. UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON ONE OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DIPLSACED (N979ER) - [SDR NX422026031600011](https://openairdocs.org/sdr/NX422026031600011), Mar 13, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANKCASE HALF TO THREE THRU STUD BORE LOCATI (N979ER) - [SDR HYIA20260327008](https://openairdocs.org/sdr/HYIA20260327008), Feb 27, 2026: Tecnam P2012. CRANKCASE. CRACKED. DURING INSPECTION, WHILE TROUBLESHOOTING AN OIL LEAK, A CRACK FOUND IN THE ENGINE CRANK CASE. THE ENGINE WAS REPLACED WI (N843CA) - [SDR NX422026022700010](https://openairdocs.org/sdr/NX422026022700010), Feb 24, 2026: Cessna 172S. STUD. DISPLACED. UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON ONE OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED (N964ER) - [SDR NX422026022700009](https://openairdocs.org/sdr/NX422026022700009), Feb 24, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ONE THRU STUD LOCATION. THE DAMAG (N964ER) - [SDR NX422026021800008](https://openairdocs.org/sdr/NX422026021800008), Feb 17, 2026: Cessna 172S. STUD. DISPLACED. UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 2 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED ST (N909ER) - [SDR NX422026021800007](https://openairdocs.org/sdr/NX422026021800007), Feb 17, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ALL 4 THRU STUD LOCATIONS. THE DA (N909ER) - [SDR NX422026021800006](https://openairdocs.org/sdr/NX422026021800006), Feb 16, 2026: Cessna 172S. STUD. DISPLACED. UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 1 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED ST (N934ER) - [SDR NX422026021800005](https://openairdocs.org/sdr/NX422026021800005), Feb 16, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO ALL 4 THRU STUD LOCATIONS. THE DA (N934ER) - [SDR NX422026020600004](https://openairdocs.org/sdr/NX422026020600004), Feb 2, 2026: Cessna 172S. STUD. DISPLACED. UPON DISASSEMBLY FOR IT'S FIRST OVERHAUL, DAMAGE WAS FOUND ON 2 OF THE THRU STUDS. THE DAMAGE APPEARS TO BE DISPLACED ST (N958ER) - [SDR NX422026020600003](https://openairdocs.org/sdr/NX422026020600003), Feb 2, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE TO THE UPPER MIDDLE FLOATING THRU ST (N958ER) - [SDR NX422026020600001](https://openairdocs.org/sdr/NX422026020600001), Feb 2, 2026: Cessna 172S. CRANKCASE. GOUGED. UPON DISASSEMBLY FOR ITS FIRST OVERHAUL, DAMAGE WAS FOUND ON THE LEFT HAND CRANCASE ON ALL 4 OF THE FLOATING THRU STUD L (N963ER) - [SDR NX422026020600002](https://openairdocs.org/sdr/NX422026020600002), Feb 2, 2026: Cessna 172S. STUD. DISPLACED. ON DISASSEMBLY FOR ITS 1ST OVERHAUL, DAMAGE FOUND ON 2 OF THRU STUDS. DAMAGE APPEARS TO BE DISPLACED STEEL UNDER THREADE (N963ER) - [SDR 2025FA0000775](https://openairdocs.org/sdr/2025FA0000775), Nov 20, 2025: CRANKCASE. GOUGED. DURING DISASSEMBLY OF THE ENGINE FOR OVERHAUL DAMAGE WAS FOUND ON THE LEFT CRANKCASE HALF AT EACH OF THE 4 THRU STUD CYL (N957ER) - [SDR HYIA20260327003](https://openairdocs.org/sdr/HYIA20260327003), Nov 5, 2025: Tecnam P2012. CASE. CRACKED. DURING TROUBLESHOOTING FOR AN OIL LEAK DURING SCHEDULED INSPECTION, A CRACK IN THE ENGINE CASE WAS FOUND IN THE AREA OF (N508CA) - [SDR 2025FA0000457](https://openairdocs.org/sdr/2025FA0000457), Jul 8, 2025: Cessna 172G. PISTON. CRACKED. HIGH OIL CONSUMPTION REPORTED. BORESCOPE INSPECTION REVEALED PISTON DAMAGE. CYLINDER REMOVED AND FOUND PISTON CRACKED AN - [SDR 2025FA0000409](https://openairdocs.org/sdr/2025FA0000409), Jun 18, 2025: Cessna 172N. CRANKCASE. CRACKED. CASE CRACKED AT TOP BASE OF #2 CYLINDER, LEAKING OIL (N3080E) - [SDR 2025FA0000383](https://openairdocs.org/sdr/2025FA0000383), Jun 3, 2025: Cirrus SR22T. CAMSHAFT. GOUGED. AN UNACCEPTABLE OIL SAMPLE LEAD TO A RECOMMENDATION BY AN OUTSIDE COMPANY TO HAVE AN INSPECTION OF THE CAMSHAFT AND LIFT (N486W) - [SDR N3XR202505230001](https://openairdocs.org/sdr/N3XR202505230001), May 21, 2025: Diamon DA42. PISTON. CRACKED. WHEN COMPLYING WITH AD2024-19-10 / MSB-E4-043 (RTBORESCOPE) INSPECTION, THE #2 PISTON WAS FOUND CRACKED. (N316ER) - [SDR N3XR20250507001](https://openairdocs.org/sdr/N3XR20250507001), May 2, 2025: Diamon DA42. PISTON. CRACKED. WHILE COMPLYING WITH AD2024-19-10 / MSB-E4-043 (RTBORESCOPE INSPECTION), THE #2 PISTON ON THE RIGHT ENGINE WAS FOUND CRA (N313ER) - [SDR 2025FA0000113](https://openairdocs.org/sdr/2025FA0000113), Jan 23, 2025: Cirrus SR22. CONNECTING ROD. BINDING. DURING FLIGHT THE AIRCRAFT OWNER/OPERATOR NOTICED A DRONING VIBRATION AT CRUISE. UPON LANDING, ALL CYLINDERS WERE INSPEC (N623ES) - [SDR 2025FA0000000](https://openairdocs.org/sdr/2025FA0000000), Jan 3, 2025: NUT. DAMAGED. NHDO ASSEMBLING COMCC??NG RODS TO CRANKSHAFT DURING OVERHAUL. II WAS NOTICED THAT T NUT WAS NOT SLMNG FLUSH TO ITS BEARI - [SDR 2024FA0000979](https://openairdocs.org/sdr/2024FA0000979), Dec 15, 2024: Piper PA31350. CRANKCASE. DAMAGED. AT CRUISE ALTITUDE, AN OIL PRESSURE FLUCTUATION WAS OBSERVED ON NO.1 ENGINE INSTRUMENTS. ALSO NOTICED A SMALL OIL STREAK (N41148) - [SDR 7L7R2024102100779](https://openairdocs.org/sdr/7L7R2024102100779), Oct 6, 2024: PISTON. DAMAGED. ECU A AND B FAIL DURING INITIAL CLIMB, AND SIGNIFICANT LOSS OF POWER. DURING SUBSEQUENT BORESCOPE INSPECTION FOUND A HOL (N946L) - [SDR N3XR20240903004](https://openairdocs.org/sdr/N3XR20240903004), Aug 30, 2024: Diamon DA42NG. PISTON. CRACKED. DURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #2 PISTON IN THE LEFT ENGINE WAS FOUND CRACKED. (N311ER) - [SDR N3XR20240903003](https://openairdocs.org/sdr/N3XR20240903003), Aug 30, 2024: Diamon DA42NG. PISTON. CRACKED. DURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #4 PISTON IN THE RIGHT ENGINE WAS FOUND CRACKED. (N304ER) - [SDR N3XR20240903002](https://openairdocs.org/sdr/N3XR20240903002), Aug 30, 2024: Diamon DA42NG. PISTON. CRACKED. DURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043, THE #4 PISTON IN THE RIGHT ENGINE WAS FOUND CRACKED. (N304ER) - [SDR N3XR202409030001](https://openairdocs.org/sdr/N3XR202409030001), Aug 30, 2024: Diamon DA42NG. PISTON. CRACKED. DURING THE BORESCOPE INSPECTION REQUIRED BY DIAMOND MSB-E4-043/0 THE #3 PISTON WAS FOUND CRACKED. (N304ER) - [SDR N3XR202408290316](https://openairdocs.org/sdr/N3XR202408290316), Aug 29, 2024: Diamon DA42NG. PISTON. CRACKED. WHILE PERFORMING THE INSPECTION OF DIAMOND MSB-E4-043 ENGINE (BORESCOPE INSPECTION) ON THE RIGHT ENGINE, THE PISTON IN C (N316ER) - [SDR 2024FA0000628](https://openairdocs.org/sdr/2024FA0000628), Aug 15, 2024: Piper PA28181. NUT. MISSING. FORWARD MOST THROUGH CASE BOLT BEHIND CRANKSHAFT SEAL AND #1 MAIN BEARING, TOP STUD AND NUT MISSING. BOTTOM BOLT AND NUT (N288BL) - [SDR 2024FA0000594](https://openairdocs.org/sdr/2024FA0000594), Aug 13, 2024: LIFTER. CORRODED. RECEIVED FACTORY REMANUFACTURED TSIO520 R9B FROM CAT. PRIOR TO REMOVING THE ENGINE FROM THE SHIPPING CRATE A PITTED AND - [SDR 2024FA0000568](https://openairdocs.org/sdr/2024FA0000568), Aug 6, 2024: FLYWHEEL. FRAGMENTED. DUAL ECU FAIL AND POWER LOSS IN FLIGHT. FOUND FLYWHEEL FAILURE WHICH APPEARS TO HAVE STARTED WITH SPRING FAILURE. (N366L) - [SDR 2024FA0000435](https://openairdocs.org/sdr/2024FA0000435), Jun 7, 2024: Piper PA28180. CASE. CRACKED. ON CLIMB TO CRUISING ALTITUDE PIC FELT AN ENGINE VIBRATION AND DECIDED TO TURN BACK TO KARG. ON TURN BACK TO DEPARTURE A (N15871) - [SDR N3XR202406120001](https://openairdocs.org/sdr/N3XR202406120001), Jun 4, 2024: Diamon DA42. PISTON. CRACKED. LEFT ENGINE POWER HAD 3% & RPM(100RPM) FLUCTUATION. VISIBLE ENGINE OIL LEAKING OUT OF AIR OUTLETS. DIVERTED TO XXXX ON T (N316ER) - [SDR 2024FA0000422](https://openairdocs.org/sdr/2024FA0000422), Jun 4, 2024: Cirrus SR22T. CONNECTING ROD. FAILED. ENGINE WAS DISASSEMBLED FOR INSPECTION DUE TO PROPELLER STRIKE. UPON DISASSEMBLY IT WAS NOTED THAT THE CONNECTING ROD BU (N522RK) - [SDR 2024FA0000141](https://openairdocs.org/sdr/2024FA0000141), Feb 9, 2024: Diamon DA40NG. ROD BOLT. SHEARED. UNUSUAL CLANGING SOUNDS HEARD DURING A TRAINING FLIGHT. IMMEDIATELY TURNED TO BASE AND GAINED ALTITUDE TO ASSURE SAFE LA (N517BL) - [SDR 2024FA0000140](https://openairdocs.org/sdr/2024FA0000140), Feb 8, 2024: Diamon DA42NG. BOLT. SHEARED. SIGNIFICANT OIL LOSS AND LOSS OF OIL PRESSURE ON TAKEOFF. FADEC SYSTEM AUTOMATICALLY SHUT DOWN ENGINE DUE TO OIL PRESSUR (N517BL) - [SDR N3XR202401160001](https://openairdocs.org/sdr/N3XR202401160001), Jan 11, 2024: Diamon DA42. PISTON. CRACKED. ON TAKE-OFF, THE CREW NOTICED A LOW OIL PRESSURE INDICATION VIA A WARNING ON THE G1000 FOR THE RIGHT ENGINE. AN EMERGENC (N304ER) - [SDR 2024FA0000003](https://openairdocs.org/sdr/2024FA0000003), Jan 3, 2024: Mooney M20TN. ROCKER BOSS. BROKEN. PILOT REPORTED SUDDEN VIBRATION IN FLIGHT, FOLLOWED BY LOSS OF CHT/EGT ON CYLINDERS #1, #3, #5, AND LOSS OF ENGINE OIL P - [SDR 2023FA0000854](https://openairdocs.org/sdr/2023FA0000854), Dec 22, 2023: Diamon DA40NG. PISTON. BROKEN. THE AIRCRAFT WAS IN CRUISE AT APPROXIMATELY 7500’ WHEN THEY EXPERIENCED SOME ENGINE ROUGHNESS, A LOSS OF OIL PRESSURE AN (N445L) - [SDR 2023FA0000837](https://openairdocs.org/sdr/2023FA0000837), Dec 16, 2023: Cessna 172N. PUSHROD. DAMAGED. DURING SB388C, EXHAUST VALVE GUIDE INSPECTION FOUND 4EA PUSH RODS P/N 15F28835-10 & 4EA ROCKERS P/N 17F19357 TO HAVE HEA (N734BB) All 2,213: https://openairdocs.org/jasc/8520/reports.md ## Other codes in chapter 85 - [JASC 8500](https://openairdocs.org/jasc/8500): Engine (Reciprocating) (745 reports) - [JASC 8510](https://openairdocs.org/jasc/8510): Reciprocating Engine Front Section (70 reports) - [JASC 8530](https://openairdocs.org/jasc/8530): Reciprocating Engine Cylinder Section (4,340 reports) - [JASC 8540](https://openairdocs.org/jasc/8540): Reciprocating Engine Rear Section (167 reports) - [JASC 8550](https://openairdocs.org/jasc/8550): Reciprocating Engine Oil System (669 reports) - [JASC 8560](https://openairdocs.org/jasc/8560): Reciprocating Engine Supercharger (21 reports) - [JASC 8570](https://openairdocs.org/jasc/8570): Reciprocating Engine Liquid Cooling (10 reports) - [JASC 8597](https://openairdocs.org/jasc/8597): Engine System Wiring (5 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.