# JASC 3620: Pneumatic Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 36 Pneumatic
- Title in the code table: PNEUMATIC INDICATING SYSTEM
- Service difficulty reports: 1,276
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=42
- Page: https://openairdocs.org/jasc/3620

## What it covers

The system components and parts which sense, transmit, and indicate the temperature and pressure of air in the distribution system other than the pressure indicator or sensor. Includes the instrument which indicates air pressure in the pneumatic distributing systems. Does not include the using systems.

## Service difficulty reports (1,276, newest 50)

- [SDR SIMA20260925003](https://openairdocs.org/sdr/SIMA20260925003), Sep 25, 2026: Emb ERJ170200LR. PRESSURE SWITCH. FAILED. BLEED 2 OVERPRESSURE AT 2,000 FT. RAN QRH, MESSAGE EXTINGUISHED YET LOOKING ON ECS PAGE BLEED, 2 VALVES SHOWED FAILED CL (N236NN)
- [SDR 2026FA0000671](https://openairdocs.org/sdr/2026FA0000671), Aug 24, 2026: Beech 200BEECH. EVA TUBE. BLOWN. IN ROUTE OVER KCOU WHEN THE MASTER CAUTION CAME ON AND THE LT BLEED FAIL LIGHT ILLUMINATED. THE PILOTS FOLLOWED THE CHKL (N888ET)
- [SDR HNAA2026081200658](https://openairdocs.org/sdr/HNAA2026081200658), Aug 11, 2026: Emb EMB145LR. CLAMP. LEAKING. BLEED 1 LEAK IN FLIGHT, ENGINE BLEED SYSTEMS. TROUBLESHOT BLEED 1 SYSTEM, FOUND CLAMP BETWEEN HSV AND CHECK VALVE TO BE  (N657AE)
- [SDR DALA2026081604673](https://openairdocs.org/sdr/DALA2026081604673), Aug 11, 2026: Boeing 757351. SENSOR. FAULTED. DIVERTED TO DEN DUE TO RIGHT BLEED OFF & CABIN ALTITUDE WARNING. REPLACED 450DEGREE TEMP SENSOR. OPS CHECKED GOOD. (8391 (N581NW)
- [SDR HNA2026F00002](https://openairdocs.org/sdr/HNA2026F00002), Aug 11, 2026: Emb EMB145LR. DUCT. LEAKING. BLEED 1 LEAK IN FLT. R & R ENGINE 1 Y-DUCT IN PYLON. NO FIX. FOUND OVER-WING COUPLING IN BLEED DUCT MISSING INTERNAL O-R (N657AE)
- [SDR HNAA202608120658](https://openairdocs.org/sdr/HNAA202608120658), Aug 11, 2026: Emb EMB145LR. WARNING MESSAGE. FALSE INDICATION. DURING CRUISE RT TANK INDICATED FROM 2000LB TO 800LB WITH FUEL IMBALANCE MESSAGE. INDICATION RETURNED TO NORMAL IN DESCE (N657AE)
- [SDR SWIA2026072576673](https://openairdocs.org/sdr/SWIA2026072576673), Jul 25, 2026: Cndair CL6002B19. SENSING ELEMENT. OUT OF POSITION. ANTI-ICE DUCT MASTER WARNING MSG ENROUTE. FOLLOWED QRH. (FLIGHT 4709) ON ARRIVAL PERFORMED OPS CHK OF WING ANTI-ICE REF  (N973SW)
- [SDR 3EJAN631RP062126](https://openairdocs.org/sdr/3EJAN631RP062126), Jun 21, 2026: Bombdr BD1001A10. SEAL. WORN. L BLEED LEAK RED CAS MESSAGE. RAN CHECKLIST AND LIGHT EVENTUALLY EXTINGUISHED. REMOVED AND REPLACED SEALS FOR BOTH PACK  (N631RP)
- [SDR SWIA2026060876217](https://openairdocs.org/sdr/SWIA2026060876217), Jun 8, 2026: Cndair CL6002C10. DUCT. OUT OF POSITION. RIGHT BLEED DUCT WARNING MESSAGE, FOLLOWED BY A R BLEED DUCT CAUTION MESSAGE. PERFORMED QRH PROCEDURE FOLLOWED BY UNPRES (N748SK)
- [SDR CALA2026060916948](https://openairdocs.org/sdr/CALA2026060916948), Jun 7, 2026: Boeing 7378. SHUTOFF VALVE. FAULTY. LEFT ENGINE ANTI ICE LIGHT ILLUMINATED DURING CLIMB OUT DURING INSPECTION OF EXISTING FAULTS, MAINTENANCE MESSAGE 36-210 (N17311)
- [SDR SWIA2026031675514](https://openairdocs.org/sdr/SWIA2026031675514), Mar 16, 2026: Cndair CL6002B19. SENSING ELEMENT. FAULTED. R 14TH DUCT WARNING DURING CLIMB OUT. RAN QRH, MESSAGE DID NOT CLEAR AFTER 40 SECONDS. DURING RETURN TO FIELD, MESSAGE D (N463SW)
- [SDR DXTA2026010906472](https://openairdocs.org/sdr/DXTA2026010906472), Jan 7, 2026: Cessna 680SOV. PRESSURE VALVE. FAULTED. SHORTLY AFTER TAKEOFF POWER APPLIED, HP VALVE FAIL LT AMBER CAS LIGHT ILLUMINATED. COMPLETED APPROPRIATE QRH. INSPECTED  (N385QS)
- [SDR DXTA2026010706447](https://openairdocs.org/sdr/DXTA2026010706447), Jan 5, 2026: Emb EMB505. SHUTOFF VALVE. FAULTY. YELLOW BLEED 1 FAIL CAS WHILE WAITING FOR TAKEOFF. PERFORMED THE QRH PROCEDURE AND WAITED AN ADDITIONAL 15 MIN WITH THE  (N326QS)
- [SDR G41A2026FA0000007](https://openairdocs.org/sdr/G41A2026FA0000007), Jan 3, 2026: Lear 60LEAR. WARNING LIGHT. ILLUMINATED. ON SATURDAY 1/3/2026, N198HB CYO198, DEPARTED KERI HEADING TO KECP. DURING CLIMB, THE PRESSURIZATION SYSTEM DUAL BLEED A (N924PS)
- [SDR SWIA202511240025](https://openairdocs.org/sdr/SWIA202511240025), Nov 23, 2025: Cndair CL6002C10. CLAMP. OUT OF ADJUST. ANTI-ICE DUCT WARNING MESSAGE DURING APPROACH , WHILE IN ICING CONDITIONS. RIGHT FUSELAGE SECTION SHOWED RED ON EICAS PA (N756SK)
- [SDR DALA2025111208281](https://openairdocs.org/sdr/DALA2025111208281), Nov 9, 2025: Airbus BD5001A10. VALVE. FAULTED. DECLARED EMERGENCY DUE TO "RT BLEED FAIL" MESSAGE WITH LEFT PACK ON MEL. REPLACED RT HIGH PRESSURE VALVE (HPV). (LP# 767 (N123DQ)
- [SDR SWIA202510070920](https://openairdocs.org/sdr/SWIA202510070920), Sep 20, 2025: Cndair CL6002B19. COUPLING. LEAKING. RIGHT 14TH DUCT WARNING MESSAGE WHEN CLIMBING THROUGH ABOUT 8000FT. RAN QRH. MESSAGE CLEARED. RETURNED TO ORD. (FLIGHT 5 (N218PS)
- [SDR CALA2025091208862](https://openairdocs.org/sdr/CALA2025091208862), Sep 10, 2025: Boeing 737924ER. DUCT. BLOWN. BLEED TRIP OFF LIGHT COMES ON DURING CLIMB LIGHT NO. 2 RESET DONE DUCT PRESS SPLIT RIGHT DUCT 16 PSI LEFT DUCT 40 PSI FO (N67815)
- [SDR DALA2025091206742](https://openairdocs.org/sdr/DALA2025091206742), Sep 8, 2025: Airbus A350941. WARNING MESSAGE. FALSE ACTIVATION. ATB- DUE TO (AIR L BLEED LEAK) MESSAGE. PERFORMED HIGH POWER ENGINE RUN AND INSPECTED WING AND PYLON DUCTING WITH NO LEA (N521DN)
- [SDR DALA2025080705932](https://openairdocs.org/sdr/DALA2025080705932), Aug 6, 2025: Airbus BD5001A11. SHUTOFF VALVE. FAULTED. ATB DUE TO "LEFT BLEED FAIL" WITH LEFT BLEED ON MEL. REPLACED LEFT PRESSURE REGULATING SHUT OFF VALVE (PRSOV). (N319DU)
- [SDR SWIA202507280001](https://openairdocs.org/sdr/SWIA202507280001), Jul 26, 2025: Cndair CL6002B19. CONTROL UNIT. WARNING MESSAGE. PLEASE T/S ANTI-ICE DUCT WARNING EVENT AT NEXT MX VISIT. RECOMMEND CHECKING THE LOOPS ON THE LEFT SYSTEMMCI TYPE: TROUBL (N975SW)
- [SDR CALA2025070306202](https://openairdocs.org/sdr/CALA2025070306202), Jun 29, 2025: Airbus A321271NX. PACKING. LEAKING. AIR R WING LEAK ECAM ON DEPARTURE.SUSPECT SEAL. WHILE WORKING TSM 36-22-00-810-841-A LEAK WAS DETECTED AT HEAT EXCHANGER (N44501)
- [SDR HNAA2025060900408](https://openairdocs.org/sdr/HNAA2025060900408), Jun 6, 2025: Emb EMB145LR. PRECOOLER. CRACKED. ON CLIMB OUT OF PHL BLEED 2 LEAK WARNING MESSAGE PRESENTED. FOUND CRACK IN #2 ENG PRECOOLER R+R #2 ENG PRECOOLER IAW AMM (N902BC)
- [SDR YENA2025050200461](https://openairdocs.org/sdr/YENA2025050200461), Apr 30, 2025: Airbus A321271NX. SENSOR. FAILED. FLT#416, SFO-JFK. (ETOPS) CLASS II AIR BLEED MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM S (N2180J)
- [SDR JJBA20250410038](https://openairdocs.org/sdr/JJBA20250410038), Apr 7, 2025: Emb EMB145XR. VALVE. INOPERATIVE. BLEED 1/2 OVER TEMP IN ICING. REMOVED AND REPLACED LOW TEMP AIR THERMOSTAT. OPS CHECK SAT. PERFORMED TI AND AGAIN BLEED  (N11189)
- [SDR 3EJA2025020613025](https://openairdocs.org/sdr/3EJA2025020613025), Jan 30, 2025: Cessna 750. SWITCH. FAILED. EICAS POPULATED AN AMBER CODE OF “HP DUCT O’PRESS R”. T/S SYSTEM. R/R OVERPRESSURE SWITCH RH SIDE DUCT. OPS CK GOOD (N928JS)
- [SDR DALA2025012700639](https://openairdocs.org/sdr/DALA2025012700639), Jan 25, 2025: Airbus A320212. SENSE LINE. LOOSE. SHIP 3251 DISC: REJECTED TAKEOFF (THRUST ADVANCED, 0 KTS). DURING ICE CLEARING PROCEDURE (70% N1) AIR ENG 2 BLEED ABNORM (N351NW)
- [SDR N6WA2025011304](https://openairdocs.org/sdr/N6WA2025011304), Jan 12, 2025: Cndair CL6002C11. CLAMP. LOOSE. R BLEED DUCT WARNING IN FLIGHT. FOUND RH FWD SENSE LINE CLAMPS LOOSE BLOWING HOT AIR ON SENSING LOOPS. RESECURED CLAMPS  (N545GJ)
- [SDR YENA2024091601271](https://openairdocs.org/sdr/YENA2024091601271), Sep 13, 2024: Emb ERJ190100IGW. CONTROLLER. MALFUNCTIONED. FLT#455, BOS-JFK. 'INFLIGHT (WHILE ALREADY OPERATING W/MEL 36-00-00A) XBLEED FAIL EICAS MESSAGE PRESENTED AND AMBER X WA (N284JB)
- [SDR N6WA2024070102](https://openairdocs.org/sdr/N6WA2024070102), Jul 1, 2024: Cndair CL6002C11. O-RING. MISSING. LEFT BLEED DUCT WARNING AT FL270. REPLACED O'RING AT HEAT EXCHANGER AFT DUCT IAW CRJ AMM 21-51-06. OPS CHECK GOOD. (N578GJ)
- [SDR DXTA2024061912097](https://openairdocs.org/sdr/DXTA2024061912097), Jun 19, 2024: Emb EMB505. SHUTOFF VALVE. ODOR. BLEED 2 FAIL YELLOW CAS: UPON LANDING IN TORRANCE, SLIGHT BURNING SMELL IN THE COCKPIT, BLEED 2 FAIL YELLOW CAS MESSAGE  (N340QS)
- [SDR SWIA202310276](https://openairdocs.org/sdr/SWIA202310276), Oct 26, 2023: Cndair CL6002B19. UNKNOWN. WARNING MESSAGE. R 10 DUCT. WARNING IN CLIMB. RAN QRH, MSG EXTINGUISHED WITHIN THE 40 SEC. RETURNED TO DEN. (FLIGHT 5346 FILED OPEN) (N959SW)
- [SDR SWIA20231026004](https://openairdocs.org/sdr/SWIA20231026004), Oct 24, 2023: Cndair CL6002B19. UNKNOWN. WARNING MESSAGE. R 10TH DUCT. MASTER WARNING AND EICAS, COMPLIED WITH QRH DID NOT RESOLVE WITH THRUST AT IDLE ON AFFECTED ENGINE IN APPRO (N959SW)
- [SDR SWIA20231023](https://openairdocs.org/sdr/SWIA20231023), Oct 23, 2023: Cndair CL6002B19. UNKNOWN. WARNING MESSAGE. REPEAT L 10TH DUCT WARNING MESSAGE ON CLIMB OUT. PLEASE REVIEW HISTORY AND T/S NEXT OVERNIGHTMCI TYPE: TROUBLESHOOTING P (N914EV)
- [SDR AALA202309273990](https://openairdocs.org/sdr/AALA202309273990), Sep 26, 2023: Airbus A319132. SENSE LINE. LOOSE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW: DURING CLIMB AIR ENGINE 1 BLEED ABNOR (N802AW)
- [SDR BAGA2023091800001](https://openairdocs.org/sdr/BAGA2023091800001), Sep 17, 2023: Emb ERJ190100IGW. UNKNOWN. UNKNOWN. BLEED 2 FAIL FOLLOWED QRH PROCEDURE EAP2-3 (N102BZ)
- [SDR AALA202309188946](https://openairdocs.org/sdr/AALA202309188946), Sep 14, 2023: Airbus A320*. TUBE. FAULTY. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO SFO DUE TO LEFT ENGINE EPR FLUCTUATION. AI (N145AN)
- [SDR DALA2023071105624](https://openairdocs.org/sdr/DALA2023071105624), Jul 11, 2023: Boeing 757232. UNKNOWN. UNKNOWN. SHIP 0698 - PRES/DIV/DE - TO JAX DUE TO DUAL BLEED TRIP AND SUBSEQUENT PRESSURIZATION ISSUES. PERFORMED EMERGENCY DESCEN (N698DL)
- [SDR YENA2023062700733](https://openairdocs.org/sdr/YENA2023062700733), Jun 23, 2023: Airbus BD5001A11. SHUTOFF VALVE. FAILED. FLT#835, BOS-MSP. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' 36 R BLEED FAIL IN CLIMBING THENFL330. R PASS REG SOV I (N3104J)
- [SDR HNAA2023062000202](https://openairdocs.org/sdr/HNAA2023062000202), Jun 19, 2023: Emb EMB145LR. UNKNOWN. UNKNOWN. BLEED 1 LEAK WITH PACK 1 SURGING & PERSISTANT PACK 1 VALVE CLOSED MESSAGE. REMOVED PANEL 191EL. FOUND BLACK FLEX DUCT AT (N662EH)
- [SDR DALA2023061304846](https://openairdocs.org/sdr/DALA2023061304846), Jun 12, 2023: Boeing 757232. UNKNOWN. UNKNOWN. SHIP 0698 - DIV - TO MIA DUE TO DUAL BLEED TRIP. CORRECTIVE ACTION: T/S, REMOVE AND REPLACED THE FAN AIR VLV, HP VLV, HP (N698DL)
- [SDR SWIA202305150014](https://openairdocs.org/sdr/SWIA202305150014), May 14, 2023: Cndair CL6002D24. UNKNOWN. WARNING MESSAGE. R BLEED DUCT WARNING MESSAGE IN CLIMB JUST AFTER TAKEOFF. SHORTLY AFTER MESSAGE BECAME R BLEED DUCT CAUTION. QRH WAS RUN (N692CA)
- [SDR DALA2023050403468](https://openairdocs.org/sdr/DALA2023050403468), May 4, 2023: Airbus A330223. UNKNOWN. UNKNOWN. SHIP 3354 -DIV- DUE TO RT WING BLEED LEAK ECAM MESSAGE. CORRECTIVE ACTION: T/S. FOUND HARNESS 3506VS AND 3508VS WITH HIG (N854NW)
- [SDR DALA2023050303442](https://openairdocs.org/sdr/DALA2023050303442), May 3, 2023: Airbus A330323. UNKNOWN. UNKNOWN. SHIP 3302 -ATB- DUE TO LT WING BLEED LEAK ECAM MESSAGE. CORRECTIVE ACTION: REPLACED BOTH HEAT EXCHANGERS DUE TO CRACK AN (N802NW)
- [SDR DALA2023042503233](https://openairdocs.org/sdr/DALA2023042503233), Apr 24, 2023: Airbus A330223. UNKNOWN. UNKNOWN. SHIP 3354 - DIV - DUE TO RT WING BLEED LEAK. CORRECTIVE ACTION: INSPECTED AND RESISTANCE CHECKED ALL LOOPS FOR THE WING, (N854NW)
- [SDR 9JLA2023042025821](https://openairdocs.org/sdr/9JLA2023042025821), Apr 13, 2023: Cessna 560XL. PRECOOLER. DAMAGED. THE FLIGHT CREW REPORTED THAT DURING FLIGHT OF RECEIVING A RIGHT BLEED AIR OVERTEMP INDICATION. THE MAINTENANCE PROVIDER (N242JT)
- [SDR SWIA20230412003](https://openairdocs.org/sdr/SWIA20230412003), Apr 12, 2023: Cndair CL6002B19. HEATING ELEMENT. WARNING MESSAGE. IN CRUISE TO DEN RECEIVED L/H 14TH STAGE DUCT WARNING FOLLOWED QRH TO LAND AT NEAREST SUITIBLE AIRPORT (FLIGHT 4741 FILE (N909EV)
- [SDR YENA2023040700328](https://openairdocs.org/sdr/YENA2023040700328), Apr 2, 2023: Airbus A321271N. UNKNOWN. UNKNOWN. FLT#1388, LAX-BOS. (ETOPS) 'CLASS 2 AIR BLEED MAINT MSG ( 36-00-00-C CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STA (N2142J)
- [SDR N6WA2023030602](https://openairdocs.org/sdr/N6WA2023030602), Mar 3, 2023: Cndair CL600*. OVERHEAT LOOP. GROUNDED. RIGHT BLEED DUCT WARNING IN FLIGHT. INSPECTED AND FOUND BLEED LOOP MT146 CONTACTING BLEED DUCT. RELOCATED AND RESECURED  (N554GJ)
- [SDR IPXA2023020390577](https://openairdocs.org/sdr/IPXA2023020390577), Feb 2, 2023: Doug MD11F. NOT ENTERED. NOT ENTERED. INSPECTION TYPE:NA**DIVERSION** DURING CLIMB OUT OF PHX CREW RECIEVED LEVEL 1 AIR SYS OFF MESSAGE. RED MANF FAIL LIGHT O (N270UP)

All 1,276: https://openairdocs.org/jasc/3620/reports.md

## Other codes in chapter 36

- [JASC 3600](https://openairdocs.org/jasc/3600): Pneumatic System (508 reports)
- [JASC 3610](https://openairdocs.org/jasc/3610): Pneumatic Distribution System (7,148 reports)
- [JASC 3697](https://openairdocs.org/jasc/3697): Pneumatic System Wiring (222 reports)

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