# JASC 2930: Hydraulic Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 29 Hydraulic Power
- Title in the code table: HYDRAULIC INDICATING SYSTEM
- Service difficulty reports: 549
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=30
- Page: https://openairdocs.org/jasc/2930

## What it covers

For reports of hydraulic pressure and quantity indicating system parts other than the indicator or sensor or for parts common to both pressure and quantity systems.

## Service difficulty reports (549, newest 50)

- [SDR FDEA202610131587](https://openairdocs.org/sdr/FDEA202610131587), Oct 13, 2026: Boeing 7572T7. INDICATION SYS. MALFUNCTIONED. DURING CLIMB OUT, GOT RT HYD SYS PRESSURE EICAS & ASSOCIATED LIGHT ON OVERHEAD. LOWER EICAS STATUS PAGE SHOWED NORMAL PR (N935FD)
- [SDR FDEA202610131564](https://openairdocs.org/sdr/FDEA202610131564), Oct 13, 2026: Boeing 7572T7. WIRE. SHORTED. DURING CLIMB OUT GOT R HYD SYS PRESS EICAS AND ASSOCIATED LIGHT ON OVERHEAD. LOWER EICAS STATUS PAGE SHOWED NORMAL PRESS (N935FD)
- [SDR SWIA2026082176954](https://openairdocs.org/sdr/SWIA2026082176954), Aug 21, 2026: Emb ERJ170200LR. VALVE. FAULTED. WHILE IN CRUISE, HYDRAULIC QUANTITY ON SYSTEM 3 WENT FROM 18% WHEN NOTICED TO 0%. LATER LOST ALL HYD 3 PRESSURE. ELEC PU (N503SY)
- [SDR DALA2026080704573](https://openairdocs.org/sdr/DALA2026080704573), Aug 6, 2026: Boeing 717200. HYDRAULIC SYSTEM. OVERTEMP. ATO- APPROX 15KTS DUE TO RT HYDRAULIC TEMP HIGH MESSAGE. BLED AND SERVICED HYDRAULIC SYSTEMS AND PERFORMED ENGINE RUN PE (N899AT)
- [SDR AALA202607286048](https://openairdocs.org/sdr/AALA202607286048), Jul 25, 2026: Airbus A321211. SWITCH. ILLUMINATED. AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED INTO CLT DUE TO THE FLIGHT CREW REPORTING THAT AFTER DEPARTURE ECAM (N170US)
- [SDR SOKF2026072001](https://openairdocs.org/sdr/SOKF2026072001), Jul 18, 2026: Airbus A320251N. TRANSMITTER. FAULTED. CONDUCTING FLIGHT AV408 FROM SAL TO ORD WHEN A BLUE HYD SYS MALFUNCTION OCCURRED DURING CRUISE PHASE OF FLIGHT. THE CREW (N901AV)
- [SDR CALA2026072017890](https://openairdocs.org/sdr/CALA2026072017890), Jul 14, 2026: Airbus A320232. WARNING MESSAGE. ILLUMINATED. G HYD RSVR LO LVL ECAM COMPLETED AND MANUAL GEAR EXTENSION ACCOMPLISHED. (N490UA)
- [SDR SIMA20260704002](https://openairdocs.org/sdr/SIMA20260704002), Jul 4, 2026: Emb ERJ170100SU. WARNING MESSAGE. FALSE ACTIVATION. HYD 2 HI TEMP, FOLLOWED BY HYD 2 OVERHEAT. QRH PROCEDURES WERE COMPLIED WITH. HYD 2 OVERHEAT REMAINED FOR REST OF FLIGHT (N780AH)
- [SDR SIMA20260627002](https://openairdocs.org/sdr/SIMA20260627002), Jun 27, 2026: Emb ERJ170200LR. INDICATION SYS. FAULTED. HYD (2) LO PRESS [CAUTION] AND HYD (2) LO QTY ADVISORY RECEIVED IN FLIGHT. PRESS WAS 0 AND QTY SHOWED 0 WHEN EICAS MESSA (N318JE)
- [SDR CWQA20260322001](https://openairdocs.org/sdr/CWQA20260322001), Mar 22, 2026: Bombdr BD1001A10. SENSOR. FAILED. DURING CLIMB AFTER TAKEOFF FROM APF CREW RECEIVED AMBER “R HYD TEMP HIGH” CAS MESSAGE. MESSAGE CAME AND WENT 3 TIMES BEF (N250AG)
- [SDR SIMA20260312002](https://openairdocs.org/sdr/SIMA20260312002), Mar 12, 2026: Emb ERJ170200LR. INDICATION SYS. FALSE INDICATION. HYD 1 LOW QTY. EMERGENCY DECLARED. NOT OVERWEIGHT. PERFORMED LEAK CHECK OF HYD 1. NO LEAKS FOUND. SERVICED SYS 1 HYD IAW (N339HG)
- [SDR DALA2026031101674](https://openairdocs.org/sdr/DALA2026031101674), Mar 9, 2026: Airbus A320212. PRIORITY VALVE. LEAKING. DECLARED EMERGENCY DUE TO LOSS OF THE GREEN SYSTEM HYDRAULIC FLUID. MANUAL GEAR EXTENSION PERFORMED. REPLACED LEAKING GR (N343NW)
- [SDR VNAA2026030913602](https://openairdocs.org/sdr/VNAA2026030913602), Mar 8, 2026: Cndair CL6002D24. TRANSDUCER. UNSERVICEABLE. HYD 1 TEMP CTN MSG IN FLIGHT. QRH DID NOT RESOLVE / T/S IAW CRJ 900 FIM 29-11-00-810-802-A01. REMOVED AND REPLACED #1 TE (N638NN)
- [SDR AALA202603022904](https://openairdocs.org/sdr/AALA202603022904), Feb 27, 2026: Boeing 7378. SWITCH. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: HYDRAULIC SYSTEM-A ELECTRICAL PUMP OVERHEAT LIGHT CAME ON.  (N304RB)
- [SDR ANCF202602264006](https://openairdocs.org/sdr/ANCF202602264006), Feb 24, 2026: Airbus A320214. SWITCH. ABNORMAL. HYD Y RSR LO LV - IAW AMM 29-13-41-000/400-004-A, REV 76, THE LOW LEVEL SWITCH OF THE YELLOW HYDRAULIC RESERVOIR WAS REP (N477AV)
- [SDR 2026FA0000072](https://openairdocs.org/sdr/2026FA0000072), Feb 3, 2026: Beech B300C. SENSOR. FAULTED. DURING PREFLIGHT CHECKS, THE TEST FEATURE OF THE LIQUID LEVEL SENSOR WAS ACTIVATED & TESTED IAW THE BEFORE START CHECKLI (N65RF)
- [SDR 2025FA0000781](https://openairdocs.org/sdr/2025FA0000781), Nov 16, 2025: Bombdr BD1001A10. TRANSDUCER. FALSE INDICATION. "L HYD TEMP HIGH" CAS MESSAGE ALONG WITH A RAPID INCREASE IN INDICATED LH HYDRAULIC TEMPERATURE NOTED DURING CLIMB PHASE (N22XZ)
- [SDR AALA202510300382](https://openairdocs.org/sdr/AALA202510300382), Oct 24, 2025: Boeing 737823. INDICATION SYS. MALFUNCTIONED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NO DECLARED DUE TO: HYDRAULIC SYSTEM-A DECREASED DURING FLIGHT. AIRCRAFT DIVERTE (N985NN)
- [SDR DXTA2025102105355](https://openairdocs.org/sdr/DXTA2025102105355), Oct 17, 2025: Textrn TEXTRON700. TRANSDUCER. FAULTED. RED CAS HYD O' TEMP B MESSAGE CAME ON IN FLIGHT CORRECTIVE ACTION: REMOVED FAULTY HYDRAULIC TEMPERATURE TRANSDUCER ON SY (N822QS)
- [SDR UIEA2025101001267](https://openairdocs.org/sdr/UIEA2025101001267), Oct 10, 2025: Boeing 74746NF. INDICATION SYS. FAULTED. FLIGHT CREW REPORTED NR 4 HYD QTY INDICATION ERRATIC IN FLIGHT. PERFORMED WIRING CHECK BETWEEN DW 3112C PIN 2 AND DM7838 (N450PA)
- [SDR UIEA2025101001264](https://openairdocs.org/sdr/UIEA2025101001264), Oct 10, 2025: Boeing 7673Y0. SHUTOFF VALVE. FAULTED. C HYD SYS PRESS EICAS MESSAGE DISPLAYED IN FLIGHT, HMG INOP. HYD PRESS INDICATION OPERATES NORMAL PER AMM 29-31-00-001.  (N1619A)
- [SDR FDEA202508211521](https://openairdocs.org/sdr/FDEA202508211521), Aug 21, 2025: Boeing 7673S2F. INDICATOR. DAMAGED. R HYD QTY INDICATES 0.00RF ON THE STATUS PAGE. INSTALLED TEMPORARY PLUG-IN PLACE OF THE BROKEN DIFFERENTIAL PRESSURE IND (N112FE)
- [SDR GTIA2025071738992](https://openairdocs.org/sdr/GTIA2025071738992), Jul 14, 2025: Airbus A320271N. PRESSURE SWITCH. FAULTED. IN AIR HYD GREEN SYS LO PR WITH BRAKES AUTO BRK FAULT NORMALBRK FAULT AND REVERSER #1 FAULT , LANDING GEAR RETRACTION IN (N903NK)
- [SDR AALA202507099411](https://openairdocs.org/sdr/AALA202507099411), Jul 8, 2025: Airbus A319112. TRANSDUCER. FAULTY. AIRCRAFT WAS GROUNDED: HYD B RSV HOT ECAM RETURNED IN FLIGHT (REPEAT). MAINTENANCE REPLACED BLUE SYSTEM TEMP TRANSDUCER  (N750UW)
- [SDR DXTA2025062704019](https://openairdocs.org/sdr/DXTA2025062704019), Jun 23, 2025: Textrn TEXTRON700. TRANSDUCER. FAULTED. HYDRAULIC INDICATING (DPI): HYD B OVERTEMP CAS MESSAGE ON CLIMB OUT. HYD SYNOPTIC HAD AMBER DASHES INSTEAD OF THE TEMP R (N836QS)
- [SDR KY7A202506182038](https://openairdocs.org/sdr/KY7A202506182038), Jun 16, 2025: Swrngn SA227AC. GAUGE. INTERMITTENT. L & R HYDRO PRESS ANNUNCIATORS AS WELL AS ZERO ON HYDRO PRESSURE GAUGE INTERMITTENT. (N425MA)
- [SDR ABXA20250531111](https://openairdocs.org/sdr/ABXA20250531111), May 31, 2025: Boeing 767232. WARNING LIGHT. FALSE ACTIVATION. AFTER BLOCK OUT WITH BOTH ENGINES RUNNING AND FLAPS EXTENDED EICAS MESSAGE APPEARED CENTER 1 PRIMARY PUMP ALSO PRESSURE  (N744AX)
- [SDR SWI2025F00653](https://openairdocs.org/sdr/SWI2025F00653), May 21, 2025: Cndair CL6002B19. HYDRAULIC SYSTEM. LOW PRESSURE. 5 MINUTES AFTER TAKEOFF HYD 2 LO PRESS CAUTION MESSAGE, ANNUNCIATED, HYDRAULIC SYSTEM TO QUANTITY REPORTED 5%, BOTH HYDR (N449SW)
- [SDR CALA2025050704517](https://openairdocs.org/sdr/CALA2025050704517), May 4, 2025: Boeing 777224. INDICATOR. FAULTED. HYDRAULIC REMOTE INDICATOR ON FILLING PANEL DOES NOT WORK IN CENTER POSITION. DISPATCHED IAW MEL ITEM NUMBER 2918A.STICK (N76010)
- [SDR HNAA2025041400202](https://openairdocs.org/sdr/HNAA2025041400202), Apr 13, 2025: Emb EMB145LR. FUSE. LEAKING. HYD 2 QTY IS EMPTY. HYD 2 WAS FULL AT PUSH BACK EMPTY BY GATE RETURN. FOUND #400 HYDRAULIC FUSE LEAKING. R&R #400 HYDRAU (N655AE)
- [SDR SWAA2025031705375](https://openairdocs.org/sdr/SWAA2025031705375), Mar 14, 2025: Boeing 7377H4. PIN. ODOR. AFTER REJECTED CLEAR OF RWY SMELLED ELECTRICAL ODER IN COCKPIT. SMELL WENT AWAY DURING RETURN TAXI TO GATE <[01]. R/R OV (N294WN)
- [SDR DXTA2025030502549](https://openairdocs.org/sdr/DXTA2025030502549), Mar 1, 2025: Bombdr BD1001A10. TRANSDUCER. DEFECTIVE. R HYD TEMP HIGH AMBER CAS: WHILE LEVELING OFF AT CRUISE, R HYD TEMP HIGH AMBER CAS ILLUMINATED AND HYD TEMP SHOT UP TO 1 (N772QS)
- [SDR WX0A1900010032340](https://openairdocs.org/sdr/WX0A1900010032340), Feb 21, 2025: Airbus A320214. RESERVOIR. LOW. (EMERGENCY DECLARED)(AIRCRAFT NOT GROUNDED) HYD Y RSVR LO LVL / REMOVED AND REPLACED RT PYLON YELOW SYSTEM PRESSURE LINE (N197NV)
- [SDR YENA2025020700139](https://openairdocs.org/sdr/YENA2025020700139), Feb 6, 2025: Airbus A321271NX. PRESSURE SWITCH. FAILED. FLT#1107, LHR-JFK. (ETOPS) GREEN HYD ENG PUMP INDICATION STAYS ON ( ECAM HYD PAGE INDICATIONS 7) PUMPS ); REMOVED AND RE (N4022J)
- [SDR ABXA20250206033](https://openairdocs.org/sdr/ABXA20250206033), Feb 6, 2025: Boeing 7673P6. WARNING LIGHT. FALSE ACTIVATION. DURING AFTER START CHECK LIST, C HYD SYS PRESS DISCRETE LIGHT AND EICAS MSG DISPLAYED. QRH PROCEDURE DID NOT FIX THE ISS (N763CK)
- [SDR DXTA2025020702247](https://openairdocs.org/sdr/DXTA2025020702247), Feb 5, 2025: Cessna 680A. RESERVOIR. DEFECTIVE. MAIN HYDRAULICS: HYD PRESS LOW RIGHT AMBER CASS. COMPLIED WITH QRH CHECKLIST. ON INITIAL DESCENT TO DESTINATION HYD VOLU (N570QS)
- [SDR IPXA2025020120155](https://openairdocs.org/sdr/IPXA2025020120155), Feb 1, 2025: Airbus A300F4622R. INDICATOR. MALFUNCTIONED. *EMERGENCY DECLARED* LEFT HYDRAULIC PRESSURE INDICATOR (YELLOW BRAKES) WAS INDICATING 3000 WHILE ON CRUISE. INDICATION W (N129UP)
- [SDR AALA202412165614](https://openairdocs.org/sdr/AALA202412165614), Dec 13, 2024: Airbus A321231. SENSOR. FAULTED. AIRCRAFT WAS GROUNDED: HYD B RSVR LO LVL AND ASSOCIATED LO PRESS IN FLT AFTER TAKEOFF. DECESION MADE TOP RETURN TO DFW E (N997AA)
- [SDR DALA2024121111623](https://openairdocs.org/sdr/DALA2024121111623), Dec 10, 2024: Airbus A319114. INDICATOR. CORRODED. SHIP 3145 SECONDARY FINDING CORROSION ON HYDRAULIC RESERVOIR INDICATOR 1834GQ LH REAR BELLY FAIRING LOWER FUSELAGE. CORR (N345NB)
- [SDR DALA2024110410640](https://openairdocs.org/sdr/DALA2024110410640), Oct 31, 2024: Boeing 737832. PRESSURE SWITCH. FAULTED. SHIP 3770 -ATB/HYD- RETURNED ATL DUE TO FLIGHT CONTROL LOW PRESSURE 'B' LIGHT ILLUMINATED. CORRECTIVE ACTION: REPLACED B (N37700)
- [SDR DALA2024102410389](https://openairdocs.org/sdr/DALA2024102410389), Oct 23, 2024: Airbus A321271NX. SWITCH. DISCONNECTED. SHIP 5007 - DIV - TO SEA DUE TO HYD Y RSVR LO LVL ECAM FOLLOWED BY HYD Y SYS LO PR ECAM MESSAGE. CORRECTIVE ACTION: FOUN (N507DZ)
- [SDR DXTA2024102100886](https://openairdocs.org/sdr/DXTA2024102100886), Oct 16, 2024: Textrn TEXTRON700. TRANSDUCER. DEFECTIVE. HYD O¿PRESS B AMBER CAS MESSAGE WITH MASTER CAUTION ILLUMINATED DURING MULTIPLE PHASES OF FLIGHT OPERATION, SOMETIMES F (N866QS)
- [SDR CALA2024101600845](https://openairdocs.org/sdr/CALA2024101600845), Oct 15, 2024: Boeing 737824. TRANSMITTER. FAULTY. HYD SYS A SHOWED CONSISTANT INDICATION OF QTY LOSS IN CRZ FLIGH T PER TOMC'S REQUEST R&R HYD 'A' SYS QTY TRANSMITTER IAW (N33264)
- [SDR CALA2024101700849](https://openairdocs.org/sdr/CALA2024101700849), Oct 14, 2024: Boeing 767322. TRANSMITTER. FAULTED. L HYD QTY EICAS STATUS PG SHOWED 0.0RF OVRHD PANEL QYT LT TROUBLESHOT PER FIM 29-11 TREE 823. COMPARED HYD QUANTITY READ (N641UA)
- [SDR FDEA202409241355](https://openairdocs.org/sdr/FDEA202409241355), Sep 24, 2024: Airbus A300F4605R. HYDRAULIC SYSTEM. LOW. DURING CRUISE AT FL330, GREEN HYD INDICATOR NEEDLE MOVING LOWER TOWARD YELLOW RANGE. INDICATION CONTINUED MOVING RAPIDLY (N662FE)
- [SDR CALA2024092400683](https://openairdocs.org/sdr/CALA2024092400683), Sep 21, 2024: Boeing 737924ER. INDICATION SYS. FALSE INDICATION. HYD A QTY FELL TO 78 AT CRUISE AND CONTINUED TO DROP TO 72 PERFORED EXTENSIVE WALKAROUND AND WHEEL WELL GVI NO VISIBLE S (N68817)
- [SDR 3EJA202407220002](https://openairdocs.org/sdr/3EJA202407220002), Jul 20, 2024: Cessna 560XL. WARNING MESSAGE. ILLUMINATED. DURING LANDING GEAR RETRACTION, A “HYD PRESS LOW” WARNING LIGHT WAS NOTED. AT THE “FRA” CALLOUT, THE “HYD PRESS LOW” LIG (N837JS)
- [SDR CALA2024070800163](https://openairdocs.org/sdr/CALA2024070800163), Jul 8, 2024: Boeing 767322. MONITOR. FAULTY. DURING TAKEOFF ROLL GOT R HYD QTY EICAS. RT HYD QTY INDICATED .4 0. REJECTED T/O CHECKED AND APPROVED FOR DEFERRAL I.A.W (N653UA)
- [SDR 2024FA0000592](https://openairdocs.org/sdr/2024FA0000592), Jul 3, 2024: Gulstm GIV. TRANSMITTER. INOPERATIVE. AIRCRAFT RETURNED FROM FLIGHT AND DECLARED EMERGENCY DUE TO " HYDRAULIC QUANTITY CAS MESSAGE", COMBINED HYDRAULIC SYSTEM (N437GA)
- [SDR AALA202407058490](https://openairdocs.org/sdr/AALA202407058490), Jul 3, 2024: Airbus A321231. SENSOR. INOPERATIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ORD DUE TO THE FLIGHT CREW REPORTING A BLU (N129AA)

All 549: https://openairdocs.org/jasc/2930/reports.md

## Other codes in chapter 29

- [JASC 2900](https://openairdocs.org/jasc/2900): Hydraulic Power System (333 reports)
- [JASC 2910](https://openairdocs.org/jasc/2910): Hydraulic System, Main (11,280 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 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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