# JASC 2910: Hydraulic System, Main

- Type: JASC system/component code (FAA)
- ATA chapter: 29 Hydraulic Power
- Title in the code table: HYDRAULIC SYSTEM, MAIN
- Service difficulty reports: 11,280
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=29
- Page: https://openairdocs.org/jasc/2910

## What it covers

The portion of the main system which is used to store and deliver hydraulic fluid to the using system. Includes all hydraulic systems other than those designated emergency or standby. Does not include the supply valves to the using systems. Typical parts are tanks, accumulators, valves, pumps, levers, cables, line, hose, relief, shutoff vales, check valves, wiring, switches, external connectors, etc.

## Service difficulty reports (11,280, newest 50)

- [SDR 2026FA0000880](https://openairdocs.org/sdr/2026FA0000880), Oct 18, 2026: Airbus A320214. HYDRAULIC LINE. LOOSE. HYD G RSVR LO LVL DURING CLIMB. IAW AMM 29-11-49-400-049-A REV 78, THE GREEN HCE PIPE#6 NUT WAS TORQUED AND ADJUSTED PRO (N955AV)
- [SDR CALA2026101920451](https://openairdocs.org/sdr/CALA2026101920451), Oct 15, 2026: Airbus A319131. HYDRAULIC LINE. LEAKING. GREEN HYD SYS LOW PRESSURE. ECAM RUN MANUAL GEAR EXTENSION. FOUND HYD LINE LEAKING IN LEFT WING BETWEEN RIB 1 AND RIB 2. (N802UA)
- [SDR CALA2026101620413](https://openairdocs.org/sdr/CALA2026101620413), Oct 15, 2026: Boeing 757224. O-RING. LEAKING. C-HYD QTY EICAS, LEAK COMING FROM DUAL PRESS/CASE DRAIN MODULE-C LOCATED IN HYD SERVICING BAY. LEAKING COMING FROM UPPER (N14106)
- [SDR FDEA202610151590](https://openairdocs.org/sdr/FDEA202610151590), Oct 15, 2026: Airbus A300F4605R. HYDRAULIC SYSTEM. LOW QUANTITY. DURING TAKEOFF ROLL AT 65 KNOTS, MASTER CAUTION WITH BLUE HYD SYS RSVR LO. REJECTED TAKEOFF AT 75 KIAS. COMPLIED WITH EC (N665FE)
- [SDR DXTA2026101510168](https://openairdocs.org/sdr/DXTA2026101510168), Oct 13, 2026: Cndair CL6002B16. O-RING. DEFECTIVE. IN CRUISE FLIGHT AT FL310 HYD 3 LO PRESS CAS ILLUMINATED. SYSTEM SHOWED 2% QUANITY AND 0 PSI. EMERGENCY DECLARED AND DIV (N268QS)
- [SDR IPXA2026101200130](https://openairdocs.org/sdr/IPXA2026101200130), Oct 11, 2026: Airbus A300F4622R. O-RING. LEAKING. AIR TURN BACK, COMPLETE HYDRAULIC GREEN LOSS OF FLUID IN FLIGHT. FOUND HYDRAULIC MOTOR ON FLAP CONTROL MODULE LEAKING. V (N153UP)
- [SDR SWAA2026101238616](https://openairdocs.org/sdr/SWAA2026101238616), Oct 11, 2026: Boeing 7378H4. HYDRAULIC SYSTEM. OVERSERVICED. SEVERAL PAX SMELLED A SCORCHED ODOR AROUND ROW 27 ON THE RIGHT SIDE OF THE AIRCRAFT. RAN PACKS WITH ENG BLEEDS RAN PACKS (N8699A)
- [SDR WNDA202610120827](https://openairdocs.org/sdr/WNDA202610120827), Oct 10, 2026: Cessna 750. HYDRAULIC LINE. LEAKING. FIRST OFFICER AND SIC WERE CONDUCTING A REPOSITION FLIGHT FROM KGKY TO KADS. ON APPROACH AND CONFIGURED AIRCRAFT FOR LAN (N200JT)
- [SDR AALA202610120473](https://openairdocs.org/sdr/AALA202610120473), Oct 10, 2026: Airbus A319112. HYDRAULIC SYSTEM. PRESSURE LOSS. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO ORD DUE TO THE FLIGHT CREW REPORTING A GRE (N709UW)
- [SDR DALA2026101405638](https://openairdocs.org/sdr/DALA2026101405638), Oct 9, 2026: Boeing 757231. PACKING. LEAKING. DIVERTED TO MSP DUE TO LOSS OF LEFT HYDRAULIC FLUID. REPLACED PACKING ON NR 5 SPOILER ACTUATOR.(7695294)(AIRCRAFT GROUND (N711ZX)
- [SDR SWIA2026100977593](https://openairdocs.org/sdr/SWIA2026100977593), Oct 9, 2026: Cndair CL6002B19. MANIFOLD. LEAKING. HYDRAULIC SYSTEM TWO WENT FROM 50 TO 5 IN 30 MINUTES NO MESSAGE ASSOCIATED UPON LANDING OBSERVED HYDRAULIC FLUID LEAKING (N945SW)
- [SDR EVCA202610120026](https://openairdocs.org/sdr/EVCA202610120026), Oct 9, 2026: Bell 206L. HYDRAULIC LINE. CHAFED. LOSS OF HYDRAULIC POWER. DUE TO LOSS OF HYDRAULIC FLUID. DUE TO CHAFED OF TWO LINES. HYDRAULIC LINES WERE CHAFED AGAINST (N132AE)
- [SDR SWIA2026100877554](https://openairdocs.org/sdr/SWIA2026100877554), Oct 8, 2026: Cndair CL6002B19. HYDRAULIC LINE. FAILED. HYD 1 LO PRESS ON CLIMB OUT, RAN QRH DID NOT FIX ISSUE, HAD TO TURN PUMP OFF, SHOWED 600 PSI & ZERO FLUID QTY. FLIGHT 51 (N919EV)
- [SDR 2026FA0000825](https://openairdocs.org/sdr/2026FA0000825), Oct 7, 2026: Agusta AW139. HYDRAULIC LINE. RUPTURED. DURING CRUISE AFTER DEPARTING, BTWN 5-10 MINUTES AFTER TAKE-OFF, AROUND 2000FT AND APPROX 140KTS, CREW NOTICED A CAS MSG (N9YTKD)
- [SDR DALA2026101305615](https://openairdocs.org/sdr/DALA2026101305615), Oct 6, 2026: Boeing 757232. O-RING. FAILED. DECLARED AN EMERGENCY DUE TO LOSS OF RIGHT HYDRAULIC SYSTEM FLUID. REPLACED FAILED O-RING ON ACCUMULATOR ISOLATION VALVE (N6715C)
- [SDR AALA202610104477](https://openairdocs.org/sdr/AALA202610104477), Oct 6, 2026: Airbus A321211. CHECK VALVE. DEFECTIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO ORD DUE TO THE FLIGHT CREW REPORTING YELLO (N194UW)
- [SDR JIKA2026100801](https://openairdocs.org/sdr/JIKA2026100801), Oct 6, 2026: Swrngn SA227AT. HYDRAULIC LINE. LEAKING. THE FLIGHT CREW NOTED A TOTAL LOSS OF HYDRAULIC PRESSURE UPON DECENT AND PERFORMED AND EMERGENCY LANDING GEAR MANUAL EXT (N573G)
- [SDR AALA202610081375](https://openairdocs.org/sdr/AALA202610081375), Oct 5, 2026: Airbus A321231. CHECK VALVE. DEFECTIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO MIA DUE TO THE FLIGHT CREW REPORTING THAT ON CLIMB OUT A YELLOW HY (N159AN)
- [SDR G41A2026100500811](https://openairdocs.org/sdr/G41A2026100500811), Oct 4, 2026: Lear 60LEAR. HOSE. LEAKING. DEPARTED KBUF HEADING TO KPSM WHEN THE CREW NOTICED THE HYDRAULIC SYSTEM PRESSURE INDICATOR READING LOWER THAN NORMAL SY (N975LV)
- [SDR YENA2026100500926](https://openairdocs.org/sdr/YENA2026100500926), Oct 2, 2026: Airbus A320232. HYDRAULIC SYSTEM. WARNING MESSAGE. FLT#1450, STI-FLL. LOST HYDRAULICS ON THE GREEN SYSTEM- ECAM MSGS THAT FOLLOWED WERE G RSVR LO LVL, G ENG 1 PUMP LO PR.  (N827JB)
- [SDR R61A2026100500296](https://openairdocs.org/sdr/R61A2026100500296), Oct 1, 2026: Emb ERJ170200LR. RELIEF VALVE. LEAKING. HYD 1 QTY DROPPED QUICKLY IN FLIGHT. DECLARED EMERGENCY AND LANDED WITH NO INCIDENT. REMOVED AND REPLACED HYD SYSTEM 1 M (N765YX)
- [SDR CALA2026100520097](https://openairdocs.org/sdr/CALA2026100520097), Sep 30, 2026: Boeing 737824. HYDRAULIC SYSTEM. FAULTED. HYD SYSTEM -A-, LIGHTS ON AFTER TAKEOFF. HYD -A- LEVEL DROPPED TO 48 & KEPT TICKING DOWN. FOUND SYSTEM -A- LOW QUANTITY  (N27213)
- [SDR FDEA202609291451](https://openairdocs.org/sdr/FDEA202609291451), Sep 29, 2026: Airbus A300B4622R. DRAIN LINE. MISINSTALLED. DURING THE CLIMB TO FL160 WE NOTICED THE GREEN HYD SYS QITY DECREASING. GREEN HYD SYSTEM CONTINUED TO ZERO ON BOTH ECAM  (N721FD)
- [SDR UIEA2026092800920](https://openairdocs.org/sdr/UIEA2026092800920), Sep 29, 2026: Boeing 74747UF. HYDRAULIC SYSTEM. LEAKING. RECEIVED REPORT OF HYD LEAK OBSERVED ON GROUND DURING TAXI/TAKEOFF. OBSERVED DROP IN HYD 1 QTY FROM 1.01 TO 0.88. ASSUME (N498MC)
- [SDR DALA2026092805396](https://openairdocs.org/sdr/DALA2026092805396), Sep 24, 2026: Airbus A350941. BYPASS VALVE. FAULTED. DE- DUE TO YELLOW HYDRAULIC TEMP HIGH ECAM MESSAGE. REPLACED HEAT EXCHANGER BYPASS VALVE (5050JM22). (LP# 9512789; AIRCR (N574DZ)
- [SDR YENA2026092500905](https://openairdocs.org/sdr/YENA2026092500905), Sep 24, 2026: Airbus A320232. CHECK VALVE. FAILED. FLT 1077, MCO-PUJ, RETURN TO FIELD. Y HYD RSVR OVHT. ECAM AFTER T/O. Y HYD ENG2 PUMP LOW PRESSURE, FOLLOWING QRH / ECAM  (N657JB)
- [SDR DXTA2026092809857](https://openairdocs.org/sdr/DXTA2026092809857), Sep 23, 2026: Cessna 560XL. WARNING MESSAGE. FALSE INDICATION. DURING INITIAL CRUISE PHASE OF FLIGHT WE RECEIVED HYD FLOW LOW L QUICKLY FOLLOWED BY A HYD FLOW LOW R. RAN THE QRH AND S (N14QS)
- [SDR SWIA2026092377273](https://openairdocs.org/sdr/SWIA2026092377273), Sep 23, 2026: Emb ERJ170200LR. HYDRAULIC LINE. LOOSE. FL 360 HEARD SOUND LIKE PUMP OR STEADY VIBRATION A LITTLE LATER GOT HYD 2 LOW PRESS FOLLOWED BY LOW QTY RAN QRCQRH FLIGH (N154SY)
- [SDR AALA202609238188](https://openairdocs.org/sdr/AALA202609238188), Sep 21, 2026: Airbus A320232. PRESSURE SWITCH. BROKEN. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO MEX DUE TO THE FLIGHT CREW REPORTING GREEN HYDRAULIC SYSTEM ENGINE (N669AW)
- [SDR DALA2026092205265](https://openairdocs.org/sdr/DALA2026092205265), Sep 21, 2026: Airbus A319114. HYDRAULIC LINE. LEAKING. DIV - TO BOS DUE TO GREEN SYSTEM HYDRAULIC QUANTITY LOSS (HYD G RSVR LO LVL ECAM WARNING). FOUND HYDRAULIC LEAK COMING F (N322NB)
- [SDR AALA202609239227](https://openairdocs.org/sdr/AALA202609239227), Sep 20, 2026: Airbus A319132. B-NUT. LOOSE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED UPON LANDING AT TO ORD DUE TO THE FLIGHT CREW REPORTING SMOKE FROM THE  (N808AW)
- [SDR CALA2026092119559](https://openairdocs.org/sdr/CALA2026092119559), Sep 19, 2026: Boeing 737824. HYDRAULIC LINE. LEAKING. HYDRAULIC FLUID STREAKS AND SHIMMERY FLUID PRESENT ON LT WING LOWER SIDE OF FLAPS AND FLAP SEALS BETWEEN OUTERMOST PYLON (N78501)
- [SDR DALA2026092405345](https://openairdocs.org/sdr/DALA2026092405345), Sep 17, 2026: Airbus BD5001A10. HOSE. LEAKING. DIRTY SOCK ODOR IN AFT GALLEY AFTER TAKEOFF, DIRTY SOCK ODOR IN COCKPIT DURING DECENT AND LANDING. CREW REPORTED ODOR ON (N129DU)
- [SDR FDEA202609171359](https://openairdocs.org/sdr/FDEA202609171359), Sep 17, 2026: Boeing 777FHT. HOSE. LOOSE. HYD QTY LOW C EICAS AT 3:45 AFTER TAKEOFF. EICAS WAS REVIEWED AND EVENT RECORD AT 1246Z. THEN RESERVE BRAKES/STRG EICAS  (N843FD)
- [SDR KY7A20260916001](https://openairdocs.org/sdr/KY7A20260916001), Sep 16, 2026: Frchld SA227DC. SHUTOFF VALVE. FAULTED. LANDING GEAR DID NOT EXTEND NORMALLY. EMERGENCY GEAR EXTENSION WAS NECESSARY. INSTALLED RT HYDRAULIC SHUTOFF VALVE. IAW  (N889DC)
- [SDR 2026F00207](https://openairdocs.org/sdr/2026F00207), Sep 14, 2026: Airbus A320214. HYDRAULIC LINE. LEAKING. A/C DIVERTED TO MIA EN ROUTE TO EWR FROM CAP. LOGPAGE 0039463 ITEM 1 - HYD GREEN RSV LO LVL. ACCOMPLISHED HYDRAULIC LEAK (N291GX)
- [SDR FDEA202609131332](https://openairdocs.org/sdr/FDEA202609131332), Sep 13, 2026: Boeing 7673S2F. PACKING. TORN. IN FLIGHT GOT C HYD QTY LIGHT ALONG WITH ECAS. RAN QRH AND COMPLIED. QTY WENT TO .05. DECLEARD EMERGENCY LANDED WITHOUT  (N112FE)
- [SDR UIEA2026091300876](https://openairdocs.org/sdr/UIEA2026091300876), Sep 12, 2026: Boeing 74747UF. ACTUATOR. LEAKING. EICAS MSG HYD PRESS SYS 3 AND HYD QTY LOW 3. COMPLIED WITH QRH. FOUND HYD LEAK FROM RH OTBD SPOILER ACTUATOR NR 9. REMOV (N498MC)
- [SDR DALA2026091405133](https://openairdocs.org/sdr/DALA2026091405133), Sep 11, 2026: Boeing 767432ER. B-NUT. LEAKING. DIV- TO JFK DUE TO DECREASING CTR SYS HYD QTY. C/W QRH. QTY STABILIZED. LANDING UNEVENTFUL. SECURED LOOSE B-NUT OVER RT  (N827MH)
- [SDR SWAA2026091473762](https://openairdocs.org/sdr/SWAA2026091473762), Sep 10, 2026: Boeing 7378H4. HYDRAULIC LINE. LEAKING. NR 2 BRAKE SMOKING, POSIBLE HYD LEAK ON BRAKE. FOUND FITTING AT QUICK DISCONNECT LOOSE. TIGHTENED HYD LINE IAW AMM 32-41 (N8320J)
- [SDR FDEA202609091292](https://openairdocs.org/sdr/FDEA202609091292), Sep 9, 2026: Doug MD11F. HYDRAULIC LINE. LEAKING. PDIS 596 29-02 1798 09SEP26 12:57 PHX FACT LEVEL 1 HYD 2 OFF ALERT ABOUT 1.5 HRS AFTER TAKEOFF. LEVEL 2 HYD 2 FAIL AFTER (N596FE)
- [SDR JIKA2026090901](https://openairdocs.org/sdr/JIKA2026090901), Sep 5, 2026: Swrngn SA227AC. HYDRAULIC LINE. BROKEN. DURING DEPARTURE FROM KBUR, THE FLIGHT CREW REPORTED THAT THE NR 1 & 2 HYDRAULIC LOW-PRESSURE ANNUNCIATORS ILLUMINATED A (N801AF)
- [SDR AALA202609061700](https://openairdocs.org/sdr/AALA202609061700), Sep 4, 2026: Airbus A319132. HYDRAULIC SYSTEM. LEAKING. AIRCRAFT WAS GROUNDED: AN EMERGENCY DECLARED & ACFT DIVERTED TO CLT DUE TO THE FLT CREW REPORTING AN GREEN HYD OVERHEAT  (N818AW)
- [SDR CALA2026090719290](https://openairdocs.org/sdr/CALA2026090719290), Sep 3, 2026: Boeing 757224. O-RING. FAULTY. RIGHT HYD QTY, FLUID LOSS RT WING, FOUND NR 11 SPOILER PCA LEAKING AT THE HYDRAULIC RETURN END CAP. O-RING FAILED. CREW  (N18119)
- [SDR IPXA2026090257018](https://openairdocs.org/sdr/IPXA2026090257018), Sep 2, 2026: Boeing 75724APF. PUMP. ILLUMINATED. EMERGENCY DECLARED, RIGHT HYD ENG PUMP EICAS MESSAGE ON CLIMB OUT. RT HYD SYS PRESSURE EICAS. REPLACED RIGHT ENGINE HYDR (N462UP)
- [SDR CALA2026090219202](https://openairdocs.org/sdr/CALA2026090219202), Sep 2, 2026: Boeing 7378. HYDRAULIC SYSTEM. OVERSERVICED. BURNING RUBBER ODOR WHEN GEAR EXTENDED. SMELLED STRONG & THEN DISSIPATED AFTR 3-4 MINS. CAPTAIN NOTED FIRST OFFICER SMEL (N27366)
- [SDR ABXA20260901378](https://openairdocs.org/sdr/ABXA20260901378), Sep 1, 2026: Boeing 767232. MODULE. LEAKING. ON DEPARTURE WHILE CLIMBING THROUGH 9000-10000 FEET THE CREW NOTICED A LOW HYDRAULIC FLUID MESSAGE. WHEN THEY CHECKED TH (N745AX)
- [SDR 4DSR202609010001](https://openairdocs.org/sdr/4DSR202609010001), Sep 1, 2026: Pilats PC1245. SELECTOR VALVE. LEAKING. DURING O.R, FOUND HYDRAULIC LEAK UNDER AIRCRAFT ON PILOT SIDE AND FOUND FLUID LEAKING FROM BELLY PANEL THAT COVERS THE S (N497PC)
- [SDR U5QA202608310179](https://openairdocs.org/sdr/U5QA202608310179), Aug 31, 2026: Bombdr BD7001A11. HYDRAULIC LINE. CRACKED. NR 1 HYD LEAK IN AIR. UNEVENTFUL LANDING. HYD FLUID NOTICED ON BOTTOM OF AFT FUSELAGE. COMPLIED WITH CAMP CARD 20260831- (N504VJ)
- [SDR YENA2026090300723](https://openairdocs.org/sdr/YENA2026090300723), Aug 28, 2026: Airbus A321231. HYDRAULIC SYSTEM. LOW. FLT#215, JFK-SFO. NOTICED INFLIGHT THAT YELLOW HYDRAULIC APPEARED TO DROP BELOW LOWER LIMIT. REMAINED THAT WAY AT GATE.; (N981JT)

All 11,280: https://openairdocs.org/jasc/2910/reports.md

## Other codes in chapter 29

- [JASC 2900](https://openairdocs.org/jasc/2900): Hydraulic Power System (333 reports)
- [JASC 2911](https://openairdocs.org/jasc/2911): Hydraulic Power Accumulator, Main (202 reports)
- [JASC 2912](https://openairdocs.org/jasc/2912): Hydraulic Filter, Main (201 reports)
- [JASC 2913](https://openairdocs.org/jasc/2913): Hydraulic Pump (Electric/Engine), Main (4,062 reports)
- [JASC 2914](https://openairdocs.org/jasc/2914): Hydraulic Handpump, Main (22 reports)
- [JASC 2915](https://openairdocs.org/jasc/2915): Hydraulic Pressure Relief Valve, Main (101 reports)
- [JASC 2916](https://openairdocs.org/jasc/2916): Hydraulic Reservoir, Main (385 reports)
- [JASC 2917](https://openairdocs.org/jasc/2917): Hydraulic Pressure Regulator, Main (65 reports)
- [JASC 2920](https://openairdocs.org/jasc/2920): Hydraulic System, Auxiliary (287 reports)
- [JASC 2921](https://openairdocs.org/jasc/2921): Hydraulic Accumulator, Auxiliary (42 reports)
- [JASC 2922](https://openairdocs.org/jasc/2922): Hydraulic Filter, Auxiliary (20 reports)
- [JASC 2923](https://openairdocs.org/jasc/2923): Hydraulic Pump, Auxiliary (138 reports)
- [JASC 2925](https://openairdocs.org/jasc/2925): Hydraulic Pressure Relief, Auxiliary (4 reports)
- [JASC 2926](https://openairdocs.org/jasc/2926): Hydraulic Reservoir, Auxiliary (14 reports)
- [JASC 2927](https://openairdocs.org/jasc/2927): Hydraulic Pressure Regulator, Auxiliary (8 reports)
- [JASC 2930](https://openairdocs.org/jasc/2930): Hydraulic Indicating System (549 reports)
- [JASC 2931](https://openairdocs.org/jasc/2931): Hydraulic Pressure Indicator (160 reports)
- [JASC 2932](https://openairdocs.org/jasc/2932): Hydraulic Pressure Sensor (290 reports)
- [JASC 2933](https://openairdocs.org/jasc/2933): Hydraulic Quantity Indicator (121 reports)
- [JASC 2934](https://openairdocs.org/jasc/2934): Hydraulic Quantity Sensor (96 reports)
- [JASC 2997](https://openairdocs.org/jasc/2997): Hydraulic Power System Wiring (343 reports)

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