# JASC 7800: Engine Exhaust System - Type: JASC system/component code (FAA) - ATA chapter: 78 Engine Exhaust - Title in the code table: ENGINE EXHAUST SYSTEM - Service difficulty reports: 281 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=67 - Page: https://openairdocs.org/jasc/7800 ## What it covers For general reports of engine exhaust system defects with insufficient information to file in a more specific JASC 7800 series code. ## Service difficulty reports (281, newest 50) - [SDR 2026FA0000037](https://openairdocs.org/sdr/2026FA0000037), Jan 19, 2026: Boeing 76733A. CHANNEL. CRACKED. DURING MAINTENANCE INSPECTIONS AT IAI FACILITIES SHOP FOUND A CRACK ON CHANNEL. DAMAGED AND ENLARGED FASTENER HOLES ON O (N407EG) - [SDR 2025FA0000514](https://openairdocs.org/sdr/2025FA0000514), Jul 23, 2025: Diamon DA42. EXHAUST PIPE. INFLT SEPARATION. HEATSHIELD IS LOOSE ON THE EXHAUST PIPE TTSN 31.9 HOURS (N350TS) - [SDR ENHA20250522001](https://openairdocs.org/sdr/ENHA20250522001), May 21, 2025: Cessna 207A. MUFFLER. LEAKING. PILOT REPORTED CO DETECTOR INDICATING. MECHANICS FOUND THE RIGHT HAND MUFFLER COUPLING LEAKING. MECHANICS REPLACED THE A (N207YH) - [SDR 2025FA0000270](https://openairdocs.org/sdr/2025FA0000270), Apr 15, 2025: Diamon DA42. EXHAUST PIPE. SEPARATED. AD2018-10-10 DATED JUNE 12 2018 REQUIRES THE HEAT SHIELD TO BE TIGHT ON THE AND WELDED TO THE EXHAUST PIPE. THE HEAT SHI (N350TS) - [SDR 2025FA0000269](https://openairdocs.org/sdr/2025FA0000269), Apr 15, 2025: Diamon DA42. EXHAUST PIPE. SEPARATED. AD2018-10-10 DATED JUNE 12 2018 REQUIRES THE HEAT SHIELD TO BE TIGHT ON THE AND WELDED TO THE EXHAUST PIPE. THE HEAT SHI (N350TS) - [SDR 2025FA0000268](https://openairdocs.org/sdr/2025FA0000268), Apr 15, 2025: Diamon DA42. EXHAUST PIPE. SEPARATED. AD2018-10-10 DATED JUNE 12 2018 REQUIRES THE HEAT SHIELD TO BE TIGHT ON THE AND WELDED TO THE EXHAUST PIPE. THE HEAT SHI (N350TS) - [SDR 2025FA0000134](https://openairdocs.org/sdr/2025FA0000134), Feb 26, 2025: Cessna 172S. MUFFLER. CRACKED. CREW REPORTS EXHAUST SMELL IN CABIN. VISUAL INSPECTION FOUND MUFFLER CRACKED. (N578CA) - [SDR VNAA202408070007](https://openairdocs.org/sdr/VNAA202408070007), Aug 7, 2024: Cndair CL6002C10. COAMING. CRACKED. RH UPPER TRANSCOWL LATCH COAMING IS CRACKED. REMOVED AND REPLACED COAMING IAW MHIRJ REO 670-54-21-1647 REV -A DATED 2024 (N719PS) - [SDR SWAA2024071512651](https://openairdocs.org/sdr/SWAA2024071512651), Jul 14, 2024: Boeing 7377BD. TAILPIPE. FIRE. TAIL PIPE FIRE ENGINE #1. EXTINGUISHED ON ITS OWN<[01] INSPECTED #1 ENGINE INLET & EXHAUST. FOUND OIL ACCUMULATION IN CE (N7720F) - [SDR MK1Y20240602008](https://openairdocs.org/sdr/MK1Y20240602008), Jun 2, 2024: Boeing 767330. SLEEVE. UNKNOWN. REPAIR - ENG #2, PW4060, PRIMARY EXHAUST SLEEVE. (N447CM) - [SDR SWAA2024042477722](https://openairdocs.org/sdr/SWAA2024042477722), Apr 21, 2024: Boeing 7378. TUBE. LEAKING. DECLARED EMERGENCY, SUSPECT LEAK #1 ENGINE<[01] R&R CENTER VENT TUBE EXTENSION AND MIXER IAW AMM 78-11-03 AND REMOVED AN (N8710M) - [SDR SWAA2024042478765](https://openairdocs.org/sdr/SWAA2024042478765), Apr 21, 2024: Boeing 7378. MIXING UNIT. LEAKING. DECLARED EMERGENCY, SUSPECT LEAK #1 ENGINE<[01] R&R CENTER VENT TUBE EXTENSION AND MIXER IAW AMM 78-11-03 AND REMOVED AN (N8710M) - [SDR SWAA2024042478766](https://openairdocs.org/sdr/SWAA2024042478766), Apr 21, 2024: Boeing 7378. PLUG. LEAKING. DECLARED EMERGENCY, SUSPECT LEAK #1 ENGINE<[01] R&R CENTER VENT TUBE EXTENSION AND MIXER IAW AMM 78-11-03 AND REMOVED AN (N8710M) - [SDR CALA2024010800052](https://openairdocs.org/sdr/CALA2024010800052), Jan 4, 2024: Boeing 757224. UNKNOWN. UNKNOWN. AFTER POWER UP ON T/O ROLL-MOMENTARY RT ENG REVERSER LIGHT-RTO COMPLIED WITH DDP DDP COMPLIED WITH DISPATCH DESK: 24 NAM (N58101) - [SDR CALA2023111603401](https://openairdocs.org/sdr/CALA2023111603401), Nov 14, 2023: Boeing 757324. UNKNOWN. UNKNOWN. DURING T/O ROLL AFTER T/O THRUST APPLIED HAD MOMENTARY RIGHT THRUST REV LIGHT. ACCOMPLISHED #2 ENGINE THRUST REVERSER DE (N77865) - [SDR CALA2023111603405](https://openairdocs.org/sdr/CALA2023111603405), Nov 13, 2023: Boeing 757224. UNKNOWN. UNKNOWN. RIGHT REVERSER AMBER LIGHT ILLUMINATED AT 115KTS ON TAKEOFF FOUND NO MESSAGE UNDER STATUS PAGE OR UNDER ECS/MSG ON P61. (N58101) - [SDR 2023FA0000677](https://openairdocs.org/sdr/2023FA0000677), Oct 25, 2023: Boeing 767381. UNKNOWN. UNKNOWN. FOUND EXISTING DOUBLER REPAIR ON ENGINE #1 PRIMARY EXHAUST SKIN AT LH SIDE. (N290CM) - [SDR 2023FA0000659](https://openairdocs.org/sdr/2023FA0000659), Oct 22, 2023: Boeing 76738E. UNKNOWN. UNKNOWN. ENG #1 EXHAUST OUTER SLEEVE S/N 0468-A P/N 015T0305-10: NRC M0769 DENT WITH SHARP CREASE IN THE OUTER EXHAUST SKIN LOCAT (N278CM) - [SDR 2023FA0000654](https://openairdocs.org/sdr/2023FA0000654), Oct 22, 2023: Boeing 76738E. UNKNOWN. UNKNOWN. DURING MAINTENANCE INSPECTION SHOP FOUND ON ENG #1, THRUST REVERSER, AT JUNCTION OF TWO (2) PANELS, LOWER REAR PART, MIS (N278CM) - [SDR 2023FA0000646](https://openairdocs.org/sdr/2023FA0000646), Oct 22, 2023: Boeing 76738E. UNKNOWN. UNKNOWN. DURING MAINTENANCE INSPECTION SHOP FOUND ON ENG #1, THRUST REVERSER, AT JUCTION OF BOTH SIDE OF C-DUCT, LOWER REAR PARTS (N278CM) - [SDR CALA2023102503168](https://openairdocs.org/sdr/CALA2023102503168), Oct 10, 2023: Boeing 757324. ACTUATOR. FAULTY. L REV CAUTION ON TAKEOFF .REV CAUTION OUT AFTER THROTTLE RETARDED MEL TO BE APPLIED WITH TOMC APPROVEL REV ISOL VALVE PI (N57869) - [SDR YV3R2023082800578](https://openairdocs.org/sdr/YV3R2023082800578), Aug 25, 2023: Robsin R44RAVENII. SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-1 WAS FOUND CRACKED.. - [SDR JJBA20230823021](https://openairdocs.org/sdr/JJBA20230823021), Jul 13, 2023: Emb EMB145XR. UNKNOWN. UNKNOWN. AT LH TR ASSY, AFT OUTBD SIDE, CORROSION SUSPECTED UNDER SKIN. LH TR ASSY REMOVED AND REPLACED. OPS CHECK SAT. (N11192) - [SDR ENHA LP233910](https://openairdocs.org/sdr/ENHA%20LP233910), May 19, 2023: Piper PA31350. SEAL. LEAKING. LEFT ENGINE BLUBBERED THEN DIED WHILE TURNING AROUND TO TAKEOFF. MECHANICS FOUND #1 CYLINDER SPARK PLUGS FOULED AND WET (N14AP) - [SDR YV3R2023061400570](https://openairdocs.org/sdr/YV3R2023061400570), May 18, 2023: Robsin R44. SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-1 WAS FOUND CRACKED. - [SDR UIEA2023051000446](https://openairdocs.org/sdr/UIEA2023051000446), May 13, 2023: Boeing 747481. DUCT. UNKNOWN. NO.1 ENG LH C-DUCT FWD V BLADE UPPER AREA CRACK(

C-DUCT REPLACED AS PER AMM 78-31-01 REV 107 DATE : 15 MAR 2023.

) (N429MC) - [SDR YV3R2023051600568](https://openairdocs.org/sdr/YV3R2023051600568), May 10, 2023: Robsin R44RAVENII. SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 WAS FOUND CRACKED. - [SDR ABXA2023042467](https://openairdocs.org/sdr/ABXA2023042467), Apr 23, 2023: Boeing 767232. UNKNOWN. UNKNOWN. LH REV ISLN VLV MSG DISPLAYED,DURING, LH ENG START. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE DEFE (N750AX) - [SDR CALA2023041201105](https://openairdocs.org/sdr/CALA2023041201105), Apr 12, 2023: Boeing 777222. THRUST REVERSER. UNKNOWN. PDA 3 #1 ENGINE THRUST REVERSER O/B AFT UPPER SIDE HAS 9 FASTENERS MISSING. SEE PHOTO. ADDED PHOTO. INSTALLED NEW FASTEN (N776UA) - [SDR UIEA2023040300304](https://openairdocs.org/sdr/UIEA2023040300304), Apr 2, 2023: Boeing 74747UF. SWITCH. UNKNOWN. ON TAKE-OFF, N1 ON #1 ENGINE ONLY PRODUCED 42% THRUST(

FOUND #1 THRUST REVERSER POSITION FEEDBACK SENSOR OUT OF ADJUST (N415MC) - [SDR HALA2023032100009](https://openairdocs.org/sdr/HALA2023032100009), Mar 21, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. REPORTED #1 ENGINE TAILPIPE FIRE. ACCOMPLISHED AMM 72-00-00-210-817-A. VISUAL INSPECTION OF ENG AFTER FIRE NO DEFECTA NO (N217HA) - [SDR 2023FA0000201](https://openairdocs.org/sdr/2023FA0000201), Mar 11, 2023: Robsin R44RAVENII. MUFFLER. FAILED. CARBON MONOXIDE INDICATION ON ON MAP DISPLAY ON FOREFLIGHT FROM SENTRY PLUS ADS-B RECEIVER. IMMEDIATELY CAME ON WHEN HEA (N74808) - [SDR UIEA2023022400192](https://openairdocs.org/sdr/UIEA2023022400192), Feb 28, 2023: Boeing 747481F. NONE. NONE. NO.4 ENG LH T/R OPEN ACTUATOR ATT POINT BOLT HOLE FOUND ELONGATED.(

NO.4 ENG LH T/R OPEN ACTUATOR ATT POINT REPAIRED I (N404KZ) - [SDR UIEA2023022200175](https://openairdocs.org/sdr/UIEA2023022200175), Feb 28, 2023: Boeing 747481F. SUPPORT RING. NONE. NO.4 ENG L/H T/R AFT CASCADE SUPPORT RING 11 O'CLOCK FOUND CRACK FORWARD OF BOLT HOLE.(

SUPPORT RING REPLACEMENT CARRI (N404KZ) - [SDR UIEA2023022000142](https://openairdocs.org/sdr/UIEA2023022000142), Feb 28, 2023: Boeing 747481F. NONE. NONE. NO.3 ENG L/H T/R IDG SERVICE DOOR AFT 2EA LATCH ATT SKIN FOUND WEAR.(

2EA WEAR SKIN AREA REPAIRED AS PER ST ENGINEERIN (N404KZ) - [SDR IXXA2023040303](https://openairdocs.org/sdr/IXXA2023040303), Feb 23, 2023: Boeing 767319. RIB. GOUGED. #2 ENGINE OUTBOARD THRUST REVERSER INSIDE FWD STIFFENER GOUGED (N367AZ) - [SDR YV3R2023031500553](https://openairdocs.org/sdr/YV3R2023031500553), Feb 16, 2023: Robsin R44RAVENII. SHIELD. CRACKED. CUSTOMER REPORTED SHIELD ASSEMBLY P/N: D314-2 CRACKED. - [SDR SROM110220222](https://openairdocs.org/sdr/SROM110220222), Nov 2, 2022: Bombdr DHC8402. NONE. CRACKED. LH NACELLE EXHAUST SHROUD SPRING CLIPS CRACKED AT 2 LOCATIONS (P/N 8Z9029-103). CRACKS ARE OUTSIDE OF MANUFACTURES LIMIT (N794CP) - [SDR UIEA2022102201169](https://openairdocs.org/sdr/UIEA2022102201169), Oct 24, 2022: Boeing 767. NONE. NONE. THREE DENTS ON ENGINE #2 PRIMARY EXHAUST OUTER SKIN BETWEEN 6/8 O´CLOCK AND BETWEEN NAC STA 323.42/344.67(

WELD FILL (N1013A) - [SDR CALA2022102402930](https://openairdocs.org/sdr/CALA2022102402930), Oct 24, 2022: Airbus A319131. NONE. MISSING. PDA 3 FOUND ON WALK AROUND: #1 ENGINE COMMON EXHAUST NOZZLE APPOX 1 O''CLOCK IS MISSING METAL. SEE PICS ADDED PICS ADD P (N848UA) - [SDR 2022FA0000618](https://openairdocs.org/sdr/2022FA0000618), Oct 21, 2022: Cessna 172N. MUFFLER. CRACKED. NEWLY "OVERHAULED" MUFFLER CRACKED AFTER ONLY 81.3 HOURS OF OPERATION. VISIBLE INDICATION OF FAILURE WAS EXHAUST SOOT ON (N7374E) - [SDR CALA2022091402347](https://openairdocs.org/sdr/CALA2022091402347), Sep 14, 2022: Boeing 757. NONE. NONE. REVERSER UNLOCK INDICATI ON DURING TAKEOFF. REJ ECTED AT AROUND 100KTS. BTS GOT TO 4 AT HIGHEST DEACTIVATED AND SECURED (N78866) - [SDR CALA2022091202343](https://openairdocs.org/sdr/CALA2022091202343), Sep 12, 2022: Airbus A300*. EEC. INOPERATIVE. PILOT REPORTS E1 REV FAULT. DIVERSION INTO BNA. THRUST REVERSER HAS BEEN DEACTIVATED AND SECURED IN THE FWD THRUST (STOW (N815UA) - [SDR CALA2022091202338](https://openairdocs.org/sdr/CALA2022091202338), Sep 12, 2022: Boeing 737. NONE. MISSING. PDA 3 #2 ENG PRIMARY EXH NOZZLE OUTBD SIDE FWD FENCE HAS ELONGATED HOLES IN NOZZLE ITSELF AND THE FENCE AND MISSING HI-L (N12218) - [SDR SWIA202266633](https://openairdocs.org/sdr/SWIA202266633), Sep 7, 2022: Cndair CL6002C10. NONE. CHAFED. L/H UPPER TRANSCOWL COAMING IS CHAFED AT FWD EDGE. (C-CHECK RO 10/24/2022) PERMANENTLY REPAIRED L/H UPPER TRANSCOWL COAM (N779SK) - [SDR SWIA202266632](https://openairdocs.org/sdr/SWIA202266632), Sep 7, 2022: Cndair CL6002C10. NONE. CHAFED. L/H LOWER TRANSCOWL COAMING IS CHAFED AT FWD EDGE. (C-CHECK RO 10/24/2022) COMPLIED WITH REO REPAIR REF REO 670-54-21-10 (N779SK) - [SDR SWIA202266631](https://openairdocs.org/sdr/SWIA202266631), Sep 7, 2022: Cndair CL6002C10. NONE. CHAFED. R/H LOWER TRANSCOWL COAMING CHAFED AT FWD EDGE. (C-CHECK RO 10/24/2022) REPAIRED R/H LOWER TRANSCOWL COAMING AT FWD EDGE (N779SK) - [SDR SWIA202266630](https://openairdocs.org/sdr/SWIA202266630), Sep 7, 2022: Cndair CL6002C10. NONE. WORN. R/H LOWER TRANSCOWL FWD AND AFT LATCH BEARING PADS ARE WORN. (C-CHECK RO 10/24/2022) REMOVED AND REPLACED FWD. AND AFT. (N779SK) - [SDR SWIA202266629](https://openairdocs.org/sdr/SWIA202266629), Sep 7, 2022: Cndair CL6002C10. NONE. CHAFED. R/H UPPER TRANSCOWL COAMING CHAFED AT FWD EDGE. (C-CHECK RO 10/24/2022) REPAIRED R/H UPPER TRANSCOWL COAMING AT FWD EDGE (N779SK) - [SDR SWIA202266628](https://openairdocs.org/sdr/SWIA202266628), Sep 7, 2022: Cndair CL6002C10. NONE. WORN. R/H UPPER TRANSCOWL LATCH DOOR HAS EXCESSIVE PLAY AT HINGE POINT. (C-CHECK RO 10/24/2022) ON R/H UPPER TRANSCOWL LATCH-D (N779SK) All 281: https://openairdocs.org/jasc/7800/reports.md ## Airworthiness concern sheets (5) - [AIR760-2009-12-S-7800-ACS](https://openairdocs.org/acs/AIR760-2009-12-S-7800-ACS): Engine Exhaust. Issued Sep 21, 2009 - [AIR750-2009-11-S-7800-ACS](https://openairdocs.org/acs/AIR750-2009-11-S-7800-ACS): Engine Exhaust. Issued Aug 21, 2009 - [AIR750-2009-04-S-7800-ACS](https://openairdocs.org/acs/AIR750-2009-04-S-7800-ACS): Exhaust Muffler. Issued Mar 19, 2009 - [AIR760-2007-09-S-7800-ACS](https://openairdocs.org/acs/AIR760-2007-09-S-7800-ACS): Heat Exchanger. Issued Apr 27, 2007 - [AIR760-2007-03-S-7800-ACS](https://openairdocs.org/acs/AIR760-2007-03-S-7800-ACS): Muffler and Tailpipe Assemblies. Issued Feb 17, 2007 ## Other codes in chapter 78 - [JASC 7810](https://openairdocs.org/jasc/7810): Engine Collector/Tailpipe/Nozzle (1,898 reports) - [JASC 7820](https://openairdocs.org/jasc/7820): Engine Noise Suppressor (248 reports) - [JASC 7830](https://openairdocs.org/jasc/7830): Engine Thrust Reverser (5,903 reports) - [JASC 7897](https://openairdocs.org/jasc/7897): Engine Exhaust System Wiring (94 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.