# JASC 4980: APU Exhaust System

- Type: JASC system/component code (FAA)
- ATA chapter: 49 Airborne Auxiliary Power
- Title in the code table: APU EXHAUST SYSTEM
- Service difficulty reports: 164
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=44
- Page: https://openairdocs.org/jasc/4980

## What it covers

The components and parts which collect and direct exhaust gasses from the APU turbine to the aircraft exterior. Includes the movable door fairing. Typical parts are nozzle, door, actuator, seal, clamp, and shield.

## Service difficulty reports (164, newest 50)

- [SDR DALA2026082004760](https://openairdocs.org/sdr/DALA2026082004760), Aug 19, 2026: Airbus A319114. BONDING STRAP. CORRODED. LEVEL 2 CORROSION, EMPENNAGE, APU EXHAUST TAIL CONE, FR86 WERE FOUND BONDING ANGLE, FRAME AUXILIARY AND LOWER CHANNEL WI (N343NB)
- [SDR IPXA2026081706388](https://openairdocs.org/sdr/IPXA2026081706388), Jul 22, 2026: Boeing 75724APF. STRAP. CORRODED. APU INLET DOOR AFT STRAP HAS CORROSION . ACCOMPLISHED THE REPAIR PER EO-98314-REQ1 AND VT-MAE EA 757-5380-27-A4592, REV. (N424UP)
- [SDR IPXA2026073073927](https://openairdocs.org/sdr/IPXA2026073073927), Jul 2, 2026: Airbus A300F4622R. EXHAUST DUCT. CRACKED. APU EXHAUST DUCT (INTERNAL SIDE) WITH CRACKS AND MISSING MATERIAL (DOT 64-004). INSTALLED NEW DUCT ASSY (INTERNAL APU DU (N144UP)
- [SDR DALA2025060204222](https://openairdocs.org/sdr/DALA2025060204222), May 31, 2025: Airbus A319114. EXHAUST DUCT. CORRODED. SHIP 3162 EMPENAGE TAIL CONE, APU EXAUST DUCT, NAVEGATION LIGHT, TRANSFORMERS SUPPORT ANGLES WITH CORROSION. CORRECTIVE  (N362NB)
- [SDR SWAA2025050967900](https://openairdocs.org/sdr/SWAA2025050967900), May 5, 2025: Boeing 7378. TAILPIPE. CONTAMINATED. CREW OBSERVED SMOKE AT BASE OF HORIZONTAL STAB WITH APU RUNNING.<[01] FOUND EXCESSIVE WATER ACCUMULATED IN APU TAIL CONE (N8827Q)
- [SDR NACA2025031100002](https://openairdocs.org/sdr/NACA2025031100002), Mar 11, 2025: Boeing 7373Q8. EXHAUST PORT. CORRODED. CORROSION AT APU COOLING AIR EXHAUST EXIT AREA OF APU DOOR. REPLACED THE DAMAGE FILLER AT APU COOLING AIR EXHAUST EXIT A (N304KH)
- [SDR U5QA202412260142](https://openairdocs.org/sdr/U5QA202412260142), Dec 26, 2024: Bombdr BD1001A10. MUFFLER. DEFECTIVE. APU FIRE INDICATION DISPLAYED DURING APU START ON APPROACH, EMERGENCY DECLARED. R&R FIRE LOOPS AND APU EXHAUST MUFFLER A (N315JE)
- [SDR DALA2024111811015](https://openairdocs.org/sdr/DALA2024111811015), Nov 16, 2024: Boeing 757351. TAILPIPE. FIRE. SHIP 5812 PRIOR TO BOARDING APU TAILPIPE FIRE. SHUT DOWN APU ADVISED FIRE OUT. PULLED AND COLLARD C/BS B-34 APU ALT CTL, (N592NW)
- [SDR LR7A2024020703361](https://openairdocs.org/sdr/LR7A2024020703361), Feb 7, 2024: Lkheed 382G. EXHAUST DUCT. CRACKED. DURING SCHEDULED B-3 CHECK UNDER JOB CARD HB3200, FOUND APU UPPER EXHAUST DUCT MOUNTING FLANGES CRACKED AT FS457, LBL90, (N405LC)
- [SDR REXA2024102901149](https://openairdocs.org/sdr/REXA2024102901149), Jan 17, 2024: Cndair CL6002D24. SEAL. TORN. APU EXHAUST AFT B SEAL TORN AWAY FROM ATTACH FASTENERS LOWER SIDE BETWEEN 5:00 AND 7:00 POSITION. REMOVED AND REINSTALLE (N299PQ)
- [SDR NACA2023110900001](https://openairdocs.org/sdr/NACA2023110900001), Nov 9, 2023: Boeing 7673BG. UNKNOWN. UNKNOWN. FOUND APU EXHAUST DUCT DAMAGED, LEFT SIDE. REMOVED AND REPLACED APU EXHAUST DUCT LEFT SIDE IAW AMM 49-11-01 (N566NC)
- [SDR YENA2022062700623](https://openairdocs.org/sdr/YENA2022062700623), Jun 25, 2022: Airbus A320232. A/C PACK. ODOR. FLT#2136, PHX-JFK. 'MAGIC MARKER FUME EVENT ON DESCENT 11K TO GROUND BOTH BACKS. ISOLATING THE PACK DID NOT HELP.; COMPL (N834JB)
- [SDR VNAA202208279992](https://openairdocs.org/sdr/VNAA202208279992), Jun 16, 2022: Cndair CL6002C10. EXHAUST DUCT. BENT. BENT APU EXHAUST DUCT AFT EDGE, SEVERAL LOCATIONS. (N538EG)
- [SDR ASAA2022052838486](https://openairdocs.org/sdr/ASAA2022052838486), May 28, 2022: Boeing 737990ER. APU. NOISY. BOTH "B" AND "C" FA'S REPORTED UNUSAL BANG AFTER COMPLETION OF PUSHBACK BOTH FELT IT IN THEIR SEATS NEITHER THE "A OR "D (N472AS)
- [SDR YENA2022052700529](https://openairdocs.org/sdr/YENA2022052700529), May 24, 2022: Airbus A320232. APU. ODOR. FLT#2061, LGA-RSW. 'ODOR SMELL WITH APU & PACKS ON AT PUSHBACK (LGA). THE SMELL IS A BURNT OIL SMELL. AFTER THE ENGINE S (N806JB)
- [SDR YENA2022051900500](https://openairdocs.org/sdr/YENA2022051900500), May 14, 2022: Airbus A321231. ECS. ODOR. FLT#1568, PUJ-JFK. ' ODER EVENT OCCURRED DURING CRUISE; COMPLIED WITH INFO NOTICE 2017-T015 SECTION A, ISOLATED ODER TO  (N972JT)
- [SDR AALA202205127356](https://openairdocs.org/sdr/AALA202205127356), May 10, 2022: Airbus A300*. THERMOCOUPLE. FAULTY. AIRCRAFT WAS GROUNDED: APU AUTO SHUTDOWN 23 MINUTES AFTER TAKEOFF. APU SHUTDOWN AGAIN AFTER RESTART. RETURNED TO DFW, LA (N163US)
- [SDR R61A2022050500318](https://openairdocs.org/sdr/R61A2022050500318), Apr 13, 2022: Emb ERJ170200LR. BAFFLE. CRACKED. DURING HEAVY CHECK MAINTENANCE FOUND APU EXHAUST BAFFLE #4 CRACKED. APU EXHAUST BAFFLE #4 HAS BEEN REPAIRED IAW ETD2022- (N724YX)
- [SDR 2022F00179](https://openairdocs.org/sdr/2022F00179), Apr 6, 2022: Cessna 680A. STINGER. CORRODED. STINGER UPPER NUTPLATE DRAG ANGLES ARE CORRODED AT NUTPLATES. (N627QS)
- [SDR REXA2022060601051](https://openairdocs.org/sdr/REXA2022060601051), Mar 23, 2022: Cndair CL6002D24. DUCT. CORRODED. APU EXHAUST DUCT HAS MULTIPLE AREAS OF CORROSION WITH A MAX DEPTH OF .006" REMOVE AND REPLACE APU EXHAUST DUCT. (N676CA)
- [SDR AALA202111161189](https://openairdocs.org/sdr/AALA202111161189), Nov 6, 2021: Airbus A319132. SHUTOFF VALVE. STUCK. AIRCRAFT WAS GROUNDED: AFTER AIRCRAFT BOARDING THE JET BRIDGE WAS PULLED AWAY THE GROUND PERSONNEL REPORT FLAME IMINATIN (N802AW)
- [SDR AALA202111165003](https://openairdocs.org/sdr/AALA202111165003), Nov 6, 2021: Airbus A319132. APU. SEIZED. AIRCRAFT WAS GROUNDED: AFTER AIRCRAFT BOARDING THE JET BRIDGE WAS PULLED AWAY THE GROUND PERSONNEL REPORT FLAME IMINATIN (N802AW)
- [SDR AALA202111091189](https://openairdocs.org/sdr/AALA202111091189), Nov 6, 2021: Airbus A319132. SHUTOFF VALVE. STUCK. AIRCRAFT WAS GROUNDED: AFTER AIRCRAFT BOARDING THE JET BRIDGE WAS PULLED AWAY THE GROUND PERSONNEL REPORT FLAME IMINATIN (N802AW)
- [SDR DALA2021110406787](https://openairdocs.org/sdr/DALA2021110406787), Oct 9, 2021: Boeing 717200. NONE. NONE. REF NRC 503: CRACK FOUND ON APU EXHAUST DUCT MATING FLANGE. MARKED. NRC 503: COMPLIED WITH PRI 594460-14 REV 3 AND ERA 5 (N971AT)
- [SDR R61A2021071000562](https://openairdocs.org/sdr/R61A2021071000562), Jun 22, 2021: Emb ERJ170100SE. BAFFLE. CRACKED. APU TAIL CONE EXHAUST BAFFLE #2 FOUND CRACK AT 09:00 LOCATION. APU TAIL CONE EXHAUST BAFFLE #2 AT 09:00 LOCATION HAS BEE (N643RW)
- [SDR V0XD20210723001](https://openairdocs.org/sdr/V0XD20210723001), Jun 5, 2021: Cndair CL6002D24. EXHAUST DUCT. CRACKED. APU EXHAUST CRACKED. CORRECTIVE ACTION: ACCOMPLISHED WELD REPAIR PER STS ENGINEERING SOLUTIONS EA 81-2012-053 REV A. HON (N912FJ)
- [SDR LR7A2021012202774](https://openairdocs.org/sdr/LR7A2021012202774), Feb 4, 2021: Lkheed 382G. EXHAUST DUCT. CRACKED. DURING SCHEDULED B-3 CHECK UNDER JOB CARD HB4902, FOUND THE APU EXHAUST DUCT MOUNTING TABS CRACKED AND BENT. / REPAIRED 
- [SDR R61A2021013000128](https://openairdocs.org/sdr/R61A2021013000128), Jan 18, 2021: Emb ERJ170100SE. BULKHEAD. CRACKED. SUPPLEMENTAL RECORD USED THE SAME SDR. TWICE. R61A2021013000127 DATED 01/18/2021 SHOULD BE R61A2021013000128 (N647RW)
- [SDR R61A2021013000127](https://openairdocs.org/sdr/R61A2021013000127), Jan 18, 2021: Emb ERJ170100SE. BULKHEAD. CRACKED. WHILE A/C WAS IN FOR HEAVY CHECK FOUND APU EXHAUST 4TH BULKHEAD FROM AFT CRACKED. REPAIRED BULKHEAD PN 170-50120-003, IA (N647RW)
- [SDR R61A2021013000130](https://openairdocs.org/sdr/R61A2021013000130), Jan 13, 2021: Emb ERJ170100SE. BULKHEAD. CRACKED. WHILE A/C WAS IN FOR HEAVY CHECK FOUND APU EXHAUST 3RD BULKHEAD FROM AFT CRACKED AT THE 12 O'CLOCK POSITION. REPAIRED BU (N647RW)
- [SDR SWIA202155373](https://openairdocs.org/sdr/SWIA202155373), Jan 9, 2021: Cndair CL6002D24. EXHAUST DUCT. CONTAMINATED. DURING TAKEOFF, A PUNGENT SMELL/FUME FILLED THE CABIN. ON ENGINE BLEEDS, A/C WAS A FFOD, APPROX 4MIN HAD ELAPSED AFTER E (N816SK)
- [SDR LR7A2020100502284](https://openairdocs.org/sdr/LR7A2020100502284), Oct 5, 2020: Lkheed 382G. BRACKET. CRACKED. DURING SCHEDULED C-1 CHECK UNDER JOB CARD HC4912, FOUND APU AFT EXHAUST DUCT UPPER MOUNTING BRACKET CRACKED. REPAIRED IA (N410LC)
- [SDR SWIA202053019](https://openairdocs.org/sdr/SWIA202053019), Oct 4, 2020: Cndair CL6002B19. HEAT SHIELD. CRACKED. APU HEAT EXHAUST SHIELD HAS A CRACK BETWEEN THE 7 O`CLOCK AND 8 O`CLOCK POSITION. FILED CLOSED RO 10/5/2020. REMOVED AND (N652BR)
- [SDR SWIA202052768](https://openairdocs.org/sdr/SWIA202052768), Sep 23, 2020: Cndair CL6002B19. HEAT SHIELD. CRACKED. APU EXHAUST SHEILD CRACKED AT THE 6 O'CLOCK POSITION. FILED CLOSED (9/23/2020). REMOVED AND REPLASED THE APU EXHAUST SHI (N980SW)
- [SDR SWIA202052767](https://openairdocs.org/sdr/SWIA202052767), Sep 23, 2020: Cndair CL6002B19. HEAT SHIELD. CRACKED. APU HEAT SHIELD HAS A CRACK AT THE 6 O' POSITION. FILED CLOSED (9/23/2020). REMOVED AND REPLACED APU EXHAUST HEAT SHIELD (N863AS)
- [SDR SWIA202052766](https://openairdocs.org/sdr/SWIA202052766), Sep 22, 2020: Cndair CL6002B19. SHIELD. CRACKED. APU EXHAUST SHIELD CRACKED AT THE 7 O'CLOCK SCREW POSITION. FILED CLOSE (9/23/2020). REMOVED AND REPLACED APU EXHAUST SH (N906SW)
- [SDR SWIA202052077](https://openairdocs.org/sdr/SWIA202052077), Aug 17, 2020: Emb ERJ170200LR. MUFFLER. UNBONDED. RACK 300 - APU INLET SILENCER VANE DISBONDED AS MARKED (C-CHECK 8/24/2020) UPON FURTHER EVALUATION FOUND APU INLET SILEN (N196SY)
- [SDR REXA2020041300467](https://openairdocs.org/sdr/REXA2020041300467), Mar 29, 2020: Cndair CL6002D24. SEAL. TORN. AWR. HIDDEN DISCREPANCY: TORN SEAL IN APU TAILCONE EXHAUST CONE ASSY [IN REF NRC 00055 ] (APU) (SM). SUMMARY: B-SEAL AFT (N300PQ)
- [SDR AALA202003309003](https://openairdocs.org/sdr/AALA202003309003), Mar 29, 2020: Airbus A321231. TUBE. BLOCKED. AIRCRAFT NOT GROUNDED: AFTER ENGINE START SFO UPON APU SHUTDOWN ANOTHER FLIGHT CREW REPORTED FLAMES /SMOKE COMING FROM A (N994AN)
- [SDR IPXA2020020325705](https://openairdocs.org/sdr/IPXA2020020325705), Feb 2, 2020: Airbus A300F4622R. ATTACH BRACKET. DAMAGED. INSPECTION TYPE:SEGAPU EXHAUST CONE HOLD OPEN ROD ATTACH BRACKET PIT P/N HOLES BLOWN OUTR&R BRACKET IAW SRM 51-40-21 (N168UP)
- [SDR QXEA2019122400476](https://openairdocs.org/sdr/QXEA2019122400476), Dec 23, 2019: Emb ERJ170200LR. APU. SMOKE. GROUND CREW REPORTED LARGE AMOUNT OF DARK SMOKE COMING FROM APU. APU PLACED ON MEL. MEL CLEARED BY PERFORMING OPS TEST O (N631QX)
- [SDR REXA2020010724025](https://openairdocs.org/sdr/REXA2020010724025), Dec 4, 2019: Cndair CL6002D24. SEAL. TORN. "AWR. HIDDEN DISCREPANCY: TORN SEAL IN APU TAILCONE EXHAUST CONE ASSY [IN REF NRC 187] (APU) (SM). "B-SEAL AFT WAS REPLA (N166PQ)
- [SDR REXA2019070101088](https://openairdocs.org/sdr/REXA2019070101088), Jul 1, 2019: Cndair CL6002D24. SEAL. TORN. AWR. HIDDEN DISCREPANCY: TORN SEAL IN APU TAILCONE EXHAUST CONE ASSY [IN REF W634079 PERM REPAIR APU EXHAUST CONE] (APU) (N279PQ)
- [SDR 2019F00219](https://openairdocs.org/sdr/2019F00219), Jun 5, 2019: Cessna 750. CAP. OUT OF TOLERANCE. APU MUFFLER EXHAUST CAP ASSEMBLY OVERSIZED HOLES. (N966QS)
- [SDR 2019F00218](https://openairdocs.org/sdr/2019F00218), Jun 5, 2019: Cessna 750. CAP. OUT OF TOLERANCE. APU MUFFLER EXHAUST CAP ASSEMBLY OVERSIZED HOLES. (N966QS)
- [SDR 2019F00172](https://openairdocs.org/sdr/2019F00172), Apr 18, 2019: Cessna 750. MUFFLER. DAMAGED. REPAIR OF APU MUFFLER EXHAUST CAP OVERSIZED HOLES. TEXTRON AVIATION REPAIR LETTER DQ1914M1 DATED APRIL 12, 2019. (N904QS)
- [SDR JJBA201902287014](https://openairdocs.org/sdr/JJBA201902287014), Feb 27, 2019: Emb EMB145XR. CASE. CRACKED. APU EXHAUST EXTERNAL CASE HAS CRACK LEFT SIDE. R&R APU (N14177)
- [SDR GTIA2018071202734](https://openairdocs.org/sdr/GTIA2018071202734), Jul 10, 2018: Airbus A320271N. DUCT CLAMP. LEAKING. F/A REPAIR FUME EVENT IN CABIN. R&R APU IAW AMM 49-11-11 OPS CHECK GOOD. LEAK FOUND AT EXHAUST CLAMP REAR OF APU. (EXHAU (N904NK)
- [SDR R61A201807160785](https://openairdocs.org/sdr/R61A201807160785), Jun 27, 2018: Emb ERJ170100SE. LINER. CORRODED. WHILE AC WAS OUT OF SERVICE FOR HEAVY CHECK, MAINTENANCE DISCOVERED LEVEL 2 CORROSION ON APU EXHAUSE LINER/SILENCER. REP (N641RW)
- [SDR R61A201710050782](https://openairdocs.org/sdr/R61A201710050782), Oct 5, 2017: Emb ERJ170100SE. SLEEVE. CRACKED. MAINTENANCE FOUND A CRACK AT THE APU TAILCONE EXHAUST SLEEVE. MAINTENANCE REMOVED AND REPLACED THE SLEEVE IAW AMM 49-82- (N861RW)

All 164: https://openairdocs.org/jasc/4980/reports.md

## Other codes in chapter 49

- [JASC 4900](https://openairdocs.org/jasc/4900): Airborne Auxiliary Power Unit (APU) System (1,839 reports)
- [JASC 4910](https://openairdocs.org/jasc/4910): APU Cowling/Containment (953 reports)
- [JASC 4920](https://openairdocs.org/jasc/4920): APU Core Engine (2,429 reports)
- [JASC 4930](https://openairdocs.org/jasc/4930): APU Engine Fuel and Control (1,087 reports)
- [JASC 4940](https://openairdocs.org/jasc/4940): APU Start/Ignition System (1,424 reports)
- [JASC 4950](https://openairdocs.org/jasc/4950): APU Bleed Air System (949 reports)
- [JASC 4960](https://openairdocs.org/jasc/4960): APU Controls (383 reports)
- [JASC 4970](https://openairdocs.org/jasc/4970): APU Indicating System (272 reports)
- [JASC 4990](https://openairdocs.org/jasc/4990): APU Oil System (2,650 reports)
- [JASC 4997](https://openairdocs.org/jasc/4997): APU System Wiring (226 reports)

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