# JASC 7270: Turbine Engine Bypass Section

- Type: JASC system/component code (FAA)
- ATA chapter: 72 Turbine/turboprop Engine
- Title in the code table: TURBINE ENGINE BYPASS SECTION
- Service difficulty reports: 65
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=61
- Page: https://openairdocs.org/jasc/7270

## What it covers

For the non-rotating portion of engine air flow ducting for the prime purpose of adding to engine thrust of turbo-jet engines. Does not include the rotating components such as blades. Typical parts are duct, skin, duct segment, etc.

## Service difficulty reports (65, newest 50)

- [SDR HYIA20230512001](https://openairdocs.org/sdr/HYIA20230512001), May 9, 2023: Tecnam P2012. SENSOR. FAILED. PILOT REPORTED LEFT ENGINE LOST FUEL PRESSURE WHEN CLIMBING THROUGH 7000 FEET. CREW NOTICED IT WAS WHEN THE LEFT FUEL PU (N995CA)
- [SDR 2021FA0000336](https://openairdocs.org/sdr/2021FA0000336), Nov 23, 2021: Cessna 680A. NONE. NONE. LH ENGINE LPT BORESCOPE PORT PLUG BROKEN BOLT. REFERENCE PRATT & WHITNEY CANADA LETTER DAA2021-891-PW306D1-CN0121, CRM C (N524QS)
- [SDR CA190617027](https://openairdocs.org/sdr/CA190617027), Jun 13, 2019: Israel ASTRASPX. DUCT. DAMAGED. (CAN) DURING ROUTINE INSPECTION, NOTICED THAT THERE WAS SOME DAMAGE ON LH ENGINE ON THE OUTER BYPASS DUCT JUST AFT OF TH
- [SDR HALA2015101300211](https://openairdocs.org/sdr/HALA2015101300211), Oct 13, 2015: Airbus A330243. GUIDE VANE. LOOSE. DURING ENGINE A-CHECK, FOUND MULTIPLE FASTENERS LOOSE ON EXIT GUIDE VANE PANELS. PERFORMED MINOR REPAIRS TO NR 1 ENGINE  (N382HA)
- [SDR SIMA20141024003](https://openairdocs.org/sdr/SIMA20141024003), Oct 24, 2014: Emb EMB145LR. DUCT. DAMAGED. TRANSFERRED FROM NRWC 942-SGF-02022 ITEM 1. LT ENG INNER RT BYPASS DUCT HAS LARGE BURN HOLE IN IT. R & R LT ENG ASSEMBLY (N942LL)
- [SDR QXEA2012100601181](https://openairdocs.org/sdr/QXEA2012100601181), Oct 6, 2012: Bombdr DHC8402. ACTUATOR. MISSING. NR 2 LOWER COWLING BYPASS DOOR AND ACTUATOR FOUND MISSING FROM THE ACFT ON POST FLIGHT WALKAROUND BY MX. REPLACED THE LO (N408QX)
- [SDR 2012FA0000647](https://openairdocs.org/sdr/2012FA0000647), Sep 26, 2012: Cessna 510. DUCT. DELAMINATED. AFT BYPASS DUCT WAS FOUND DELAMINATED DURING A SCHEDULED INSPECTION. (N949JB)
- [SDR 2011FA0000636](https://openairdocs.org/sdr/2011FA0000636), Sep 28, 2011: Gulstm GV. PANEL. DAMAGED. APPROX 4" DIAMETER HOLE IN INNER BYPASS DUCT PANEL OVER NR1 IGNITOR OF RT ENGINE. (N661GA)
- [SDR CHQA200900178](https://openairdocs.org/sdr/CHQA200900178), Aug 14, 2009: Emb EMB145LR. ENGINE. LEAKING. FLIGHT 6047, CMH TO JFK. ON CLIMBOUT BETWEEN 500 TO 1,000 FT A BURNING ODOR THAT SMELLED LIKE OIL WAS NOTICED IN THE COC (N571RP)
- [SDR CA070613001](https://openairdocs.org/sdr/CA070613001), Jun 12, 2007: DUCT. MISREPAIRED. (CAN) ENGINE FRONT BYPASS DUCT FOUND AT INSPECTION WITH NON STANDARD REPAIR OUTSIDE OEM LIMITATION. PATCH REPAIR ON OUTS
- [SDR DXTA200601576](https://openairdocs.org/sdr/DXTA200601576), Aug 24, 2006: Cessna 560CESSNA. DUCT. SEPARATED. RIGHT ENGINE REAR INNER BYPASS DUCT SEPARATED FROM AIRCRAFT DURING TAKEOFF ROLL. REMOVED REAR INNER BYPASS DUCT ASSEMBLY (N354QS)
- [SDR DXTA200601573](https://openairdocs.org/sdr/DXTA200601573), Aug 24, 2006: Cessna 560CESSNA. DUCT. SEPARATED. RIGHT ENGINE REAR INNER BYPASS DUCT SEPARATED FROM AIRCRAFT DURING TAKEOFF ROLL. (N354QS)
- [SDR DELA200600002](https://openairdocs.org/sdr/DELA200600002), Jul 26, 2006: Lear 55LEAR. SKIN. CRACKED. DURING ROUTINE LINE MAINTENANCE WALK INSPECTION, 2 CRACKS WERE NOTED IN 2 SEPARATE SKINS OF THE LT SIDE INNER BY PASS DU (N522WK)
- [SDR CA060531014](https://openairdocs.org/sdr/CA060531014), May 17, 2006: Lear 60LEAR. PANEL. FRACTURED. (CAN) DURING GROUND INSPECTION METAL DEBRIS WAS FOUND LODGED IN THE ENGINE BYPASS DUCTING. THE ENGINE'S INNER BYPASS DUC
- [SDR BHK2006F00000](https://openairdocs.org/sdr/BHK2006F00000), Apr 18, 2006: Lear 35LEAR. FAN BLADE. BROKEN. THE MID SPAN DAMPENER APPEARS TO HAVE BROKEN OFF AND WENT THROUGH THE BYPASS OF THE ENGINE. THIS CAUSED DAMAGE TO SOME O (N53FN)
- [SDR CLC2006F00004](https://openairdocs.org/sdr/CLC2006F00004), Apr 7, 2006: Doug DC1030F. DUCT. BROKEN. ON CLIMB OUT, NR 1 ENGINE FIRE DETECTOR ILLUMINATED. RETURNED TO DEPARTURE, INSPECTION OF AC ENGINE FOUND BLOWN DUCT. RE (N306FV)
- [SDR 249TR0067](https://openairdocs.org/sdr/249TR0067), Dec 22, 2004: Boeing 7372K5. FLANGE. CRACKED. LEFT ENGINE FLANGE CRACKED OUTBOARD MOUNT FLANGE FOR THE PRECOOLER. REPAIRED PER JT8D MM 72-00. (N249TR)
- [SDR EIA2004005](https://openairdocs.org/sdr/EIA2004005), Jan 12, 2004: Boeing 747132. GUIDE VANE. MISSING. ON POST FLIGHT WALKAROUND FOUND FAN EXIT GUIDE VANE MISSING AT 6:30 POSITION ON NR 4 ENGINE. VANE STRUCK T/E OF T/R SLEE (N479EV)
- [SDR HALA0301199](https://openairdocs.org/sdr/HALA0301199), Dec 23, 2003: Boeing 717200. BYPASS VALVE. MALFUNCTIONED. FLT 119 - HNL - 'ENG RT SYSTEM FAIL' ILLUMINATE EN ROUTE, STAYED ON ENTIRE TIME. INTERROGATED EEC-2. FOUND FAULT 731304, (N487HA)
- [SDR B3OR20031119](https://openairdocs.org/sdr/B3OR20031119), Nov 4, 2003: Cessna 550. DUCT. CRACKED. DURING A PHASE 3 AND 4 INSPECTION, IT WAS DISCOVERED THAT THE FORWARD INNER BY-PASS DUCT HAD A CRACK. THE CRACK WAS LOCA (N26496)
- [SDR UO22003F00007](https://openairdocs.org/sdr/UO22003F00007), Oct 13, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 2 ENGINE AFT DUCT CRACKED AROUND RIB DUCTS. (N377SC)
- [SDR UO22003F00006](https://openairdocs.org/sdr/UO22003F00006), Oct 13, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 3 ENGINE AFT DUCT CRACKED AROUND RIB DUCTS.(K) (N377SC)
- [SDR UO22003F00005](https://openairdocs.org/sdr/UO22003F00005), Oct 13, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 1 ENGINE AFT DUCT CRACKED AROUND RIB DUCTS. (N377SC)
- [SDR UO22003F00010](https://openairdocs.org/sdr/UO22003F00010), Oct 3, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 1 ENGINE AFT BY-PASS DUCT CRACK AROUND 9 O’CLOCK RIB DUCT, ALLOWED MOMENTARY DISENGAGEMENT OF OIL TRANSFER TUBE AND O (N2425)
- [SDR UO22003F00009](https://openairdocs.org/sdr/UO22003F00009), Oct 3, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 2 ENGINE AFT BY-PASS DUCT CRACKED AROUND 3 AND 9 OCLOCK RIB DUCTS. REFERENCE TWO (2) ADDITIONAL MDR DATED 10/03/03 ON (N2425)
- [SDR UO22003F00008](https://openairdocs.org/sdr/UO22003F00008), Oct 3, 2003: Amd FALCON900EX. DUCT. CRACKED. NR 3 ENGINE AFT BY-PASS DUCT CRACKED AROUND 3 AND 9 O`CLOCK RIB DUCTS. REFERENCE TWO (2) ADDITIONAN MDR DATED 10/03/03 O (N2425)
- [SDR C2XA03IA083](https://openairdocs.org/sdr/C2XA03IA083), Aug 13, 2003: Emb EMB145. MANIFOLD. DISLODGED. IAH - AFTER ROTATION THE CREW REPORTED THAT THE NR 1 ENGINE EXCEEDED ALLOWABLE TEMPERATURE LIMITS. THE AIRCRAFT RETURNED (N17115)
- [SDR COMA0360162](https://openairdocs.org/sdr/COMA0360162), Mar 21, 2003: Cndair CL6002B19. FAN. FLIGHT 5490 VIB WARNING WHEN T/O THRUST APPLIED.COULD NOT DUPLICATE - INSPECTED ENGINE AND FOUND NO DISCREPANCIES, C/W A (N984CA)
- [SDR AUS20021139](https://openairdocs.org/sdr/AUS20021139), Oct 9, 2002: Boeing 737476. PANEL. DAMAGED. (AUS) RH ENGINE BIRDSTRIKE. INVESTIGATION FOUND ENGINE NACELLE FAN DUCT EXTENSION UPPER ACOUSTIC PANEL MISSING.
- [SDR CA020503001](https://openairdocs.org/sdr/CA020503001), Apr 3, 2002: Cessna 500CESSNA. DUCT. CRACKED. (CAN) DURING PHASE I & II INSPECTION, LT ENGINE FRONT & REAR INNER BYPASS DUCT FOUND CRACKED. PARTS REMOVED FROM ENGINE 
- [SDR C2XA02TY031](https://openairdocs.org/sdr/C2XA02TY031), Feb 18, 2002: Emb EMB135LR. DUCT. CORRODED. TYS DURING A SCHEDULED 1-C INSPECTION CORROSION WAS FOUND BETWEEN THE OUTER BYPASS AND THE FAN CASE ON NR 2 ENGINE. MAIN (N29515)
- [SDR CA020215010](https://openairdocs.org/sdr/CA020215010), Feb 4, 2002: Cessna 501. DUCT. CRACKED. (CAN) DURING DAILY INSPECTION, RT ENGINE FRONT & REAR INNER BYPASS DUCT FOUND CRACKED AND PIECE OF REAR UNDER BYPASS DUC
- [SDR B3OR20020005](https://openairdocs.org/sdr/B3OR20020005), Feb 2, 2002: Cessna 550. DUCT. CRACKED. AIRCRAFT WAS INDUCTED INTO A PHASE1,2,5A & B INSPECTION.DURING THE INSPECTION OF THE NUMBER 2 ENGINE, THE FRONT BY-PASS  (N26494)
- [SDR CA020211014](https://openairdocs.org/sdr/CA020211014), Jan 13, 2002: Boeing 717200. BYPASS JACKET. DAMAGED. (CAN) A/C CAME IN FOR OVERNIGHT WITH NO MAINT PROBLEMS REPORTED. DURING OVERNIGHT SERVICE CHECK, DAMAGE NOTED ON BYPASS 
- [SDR C2XA01TY218](https://openairdocs.org/sdr/C2XA01TY218), Dec 30, 2001: Emb EMB135LR. BYPASS JACKET. CORRODED. TYS DURING A SCHEDULED 1-C INSPECTION THE NR 1 FANCASE TO BYPASS HAD CORROSION. MAINTENANCE CLEANED UP THE CORROSION. AP (N14514)
- [SDR C2XA01TY202](https://openairdocs.org/sdr/C2XA01TY202), Dec 15, 2001: Emb EMB135ER. BYPASS JACKET. CORRODED. TYS DURING A SCHEDULE INSPECTION, BETWEEN THE FAN CASE AND THE OUTER BYPASS, OXIDATION WAS FOUND ON NR 1 AND NR 2 ENGINE (N27512)
- [SDR C2XA01TY203](https://openairdocs.org/sdr/C2XA01TY203), Dec 15, 2001: Emb EMB135ER. BYPASS JACKET. CORRODED. TYS DURING A SCHEDULE INSPECTION, BETWEEN THE FAN CASE AND THE OUTER BYPASS, OXIDATION WAS FOUND ON NR 1 ENGINE. MAINTEN (N27512)
- [SDR C1HA200182013](https://openairdocs.org/sdr/C1HA200182013), Oct 4, 2001: Boeing 7272S7. ENGINE. AFTER DEPARTURE IN CANCUN, #3 ENGINE BYPASS LIGHT ILLUMINATED ALSO LOUD VIBRATION IN #3 ENGINE PULLED POWER TO FLIGHT ID (N682CA)
- [SDR AUS20010968](https://openairdocs.org/sdr/AUS20010968), Sep 5, 2001: Boeing 767238. ACOUSTIC PANEL. MISSING. (AUS) RT ENGINE COLD STREAM DUCT ACOUSTIC PANELS MISSING.
- [SDR COMA0160679](https://openairdocs.org/sdr/COMA0160679), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5775. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERED MULTIPLE BIRD STRIKES ON #1 ENGINE, CREW DECLARED AN EMERGENC (N937CA)
- [SDR COMA0160678](https://openairdocs.org/sdr/COMA0160678), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5575. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERED MULTIPLE BIRD STRIKES ON #1 ENGINE, CREW DECLARED AN EMERGENC (N937CA)
- [SDR COMA0160677](https://openairdocs.org/sdr/COMA0160677), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5575. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERED MULTIPLE BIRD STRIKES ON #1 ENGINE, CREW DECLARED AN EMERGENC (N937CA)
- [SDR COMA0160676](https://openairdocs.org/sdr/COMA0160676), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5775. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERD MULTIPLE BIRD STRIKES ON #1 ENIGNE, CREW DECLARED AN EMERGENCY (N937CA)
- [SDR COMA0160675](https://openairdocs.org/sdr/COMA0160675), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5775. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERED MULTIPLE BIRD STRIKES ON #1 ENGINE, CREW DELCARED AN EMERGENC (N937CA)
- [SDR COMA0160674](https://openairdocs.org/sdr/COMA0160674), Sep 4, 2001: Cndair CL6002B19. FAN BLADE. DAMAGED. FLIGHT #5775. DURING CLIMB OUT OF CVG AIRCRAFT ENCOUNTERED MULTIPLE BIRD STRIKES ON #1 ENGINE, CREW DECLARED AN EMERGENC (N937CA)
- [SDR COMA0160234](https://openairdocs.org/sdr/COMA0160234), Feb 10, 2001: Cndair CL6002B19. WARNING SYSTEM. ILLUMINATED. RT ENGINE FAN VIB ICON ON EICAS. INSPECTED ENGINE AND FOUND NO DEFECTS. COULD NOT DUPLICATE. (N958CA)
- [SDR COMA0160110](https://openairdocs.org/sdr/COMA0160110), Jan 14, 2001: Cndair CL6002B19. PLUG. CHAFED. LEFT ENGINE FAN VIB INDICATED 2.7. FOUND BLADES RUBBING AT ACCESS PLUG. ADJUSTED GAP AT ACCESS PLUG. (N967CA)
- [SDR COMA0160098](https://openairdocs.org/sdr/COMA0160098), Jan 13, 2001: Cndair CL6002B19. SPINNER. VIBRATION. LEFT ENGINE FAN VIB INDICATED 2.7. REPLACED THE AFT FAN SPINNER (OUT OF BALANCE). (N954CA)
- [SDR 20000503SH004](https://openairdocs.org/sdr/20000503SH004), May 3, 2000: Doug DC987. CASE. DAMAGED. IT LOOKED LIKE THE Y-DUCT OF THE BLEED AIR MANIFOLD ASSY FAILED AT THE WELD CAUSING THE FAIRING ASSY OF THE FAN DUCT TO  (N143G)
- [SDR CA000516033](https://openairdocs.org/sdr/CA000516033), Apr 11, 2000: Cndair CL6001A11. FAN. FAILED. (CAN) FOLLOWING A/C ROTATIONAT 100AGL THE NUMBER 2 ENGINE AUTOMATICALLY SHUTDOWN WITH AN OVERSPEED INDICATION. N1 FAN WO

All 65: https://openairdocs.org/jasc/7270/reports.md

## Other codes in chapter 72

- [JASC 7200](https://openairdocs.org/jasc/7200): Engine (Turbine/Turboprop) (14,713 reports)
- [JASC 7210](https://openairdocs.org/jasc/7210): Turbine Engine Reduction Gear (873 reports)
- [JASC 7220](https://openairdocs.org/jasc/7220): Turbine Engine Air Inlet Section (1,718 reports)
- [JASC 7230](https://openairdocs.org/jasc/7230): Turbine Engine Compressor Section (5,063 reports)
- [JASC 7240](https://openairdocs.org/jasc/7240): Turbine Engine Combustion Section (509 reports)
- [JASC 7250](https://openairdocs.org/jasc/7250): Turbine Section (3,624 reports)
- [JASC 7260](https://openairdocs.org/jasc/7260): Turbine Engine Accessory Drive (1,098 reports)
- [JASC 7261](https://openairdocs.org/jasc/7261): Turbine Engine Oil System (5,122 reports)
- [JASC 7297](https://openairdocs.org/jasc/7297): Turbine Engine System Wiring (275 reports)

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