# JASC 2923: Hydraulic Pump, Auxiliary

- Type: JASC system/component code (FAA)
- ATA chapter: 29 Hydraulic Power
- Title in the code table: HYDRAULIC PUMP, AUXILIARY
- Service difficulty reports: 138
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=30
- Page: https://openairdocs.org/jasc/2923

## What it covers

The component which provides hydraulic fluid pressure to the using auxiliary system. Typical parts are pump, motor, shaft, brushes, case, seal, switches, etc.

## Service difficulty reports (138, newest 50)

- [SDR SWAA2025032007746](https://openairdocs.org/sdr/SWAA2025032007746), Mar 18, 2025: Boeing 7377Q8. PUMP. LOW PRESSURE. AFTER FLAPS 5 HYD A SYSTEM LOOW PRESSURE LIGHTS ON BOTH ENG AND ELECTRIC PUMP SHORTLY AFTER LOW PRESSURE LIGHTS ON HYD S (N7876A)
- [SDR DALA2023042003112](https://openairdocs.org/sdr/DALA2023042003112), Apr 19, 2023: Boeing 717200. UNKNOWN. UNKNOWN. SHIP 9512 -HYD/DE- THE RIGHT HYDRAULIC SYSTEM EXPERIENCED A COMPLETE LOSS OF FLUID WHILE ON APPROACH FOR LANDING. THE CR (N953AT)
- [SDR 2023F00067](https://openairdocs.org/sdr/2023F00067), Feb 21, 2023: Boeing 73737Q. PUMP. INOPERATIVE. HYDRAULIC SYSTEM "A" PUMP (ELECTRICAL N°2) WITH LOW PRESSURE. CORRECTIVE ACTION: HAS BEEN CHANGED PUMP. IN TEST NO FOUND
- [SDR CALA2022083102225](https://openairdocs.org/sdr/CALA2022083102225), Aug 31, 2022: Airbus A300*. NONE. NONE. HYD Y RSVR LOHYD Y RSRV OVHT INSP AC FOUND LEAK AT PRIORITY VALVE ON POWER TRANSFER UNIT MANIFOLD ON AFT WALL ABOVE KEEL (N828UA)
- [SDR DALA2020040902226](https://openairdocs.org/sdr/DALA2020040902226), Apr 6, 2020: Boeing 757232. PUMP. DAMAGED. SHIP 6713 DURING INSP FOUND INDICATION OF ARCING AND BURN MARKS ON ACMP CONTACTS ON RH. CORRECTIVE ACTION: REMOVED AND R (N6713Y)
- [SDR DALA2020040902225](https://openairdocs.org/sdr/DALA2020040902225), Apr 6, 2020: Boeing 757232. PUMP. DAMAGED. SHIP 6713 DURING INSPECTION FOUND ARCING AND BURN MARKS ON LH ACMP. CORRECTIVE ACTION: REMOVED AND REPLACED LH ACMP IAW  (N6713Y)
- [SDR CALA2019052400810](https://openairdocs.org/sdr/CALA2019052400810), May 21, 2019: Boeing 777222. PUMP. CRACKED. RAT HYDRAULIC PUMP CASE SPLIT WHILE ACCOMPLISHING AN OPERATIONAL TEST. NEED TO CREATE SDR DUE TO RAT PUMP FAILURE REF GM (N780UA)
- [SDR DALA2019051403020](https://openairdocs.org/sdr/DALA2019051403020), May 12, 2019: Bombdr BD1001A10. PUMP. LEAKING. ON TAXI IN CREW NOTED VERY STRONG ODOR RESEMBLING ELECTRICAL SOURCE. NO ACTUAL SMOKE OBSERVED. SMELL DISSIPATED AFTER AP (N107DU)
- [SDR DALA2019031501702](https://openairdocs.org/sdr/DALA2019031501702), Mar 14, 2019: Doug MD88. BRACKET. BROKEN. WHILE WORKING JOB CARD 0591-0301 FOUND AUX HYD PUMP WIRE HARNESS BRACKET BROKE. REF EA 09-457000-03AD FIG 2 ITEM 7. INST (N984DL)
- [SDR DALA2018021500931](https://openairdocs.org/sdr/DALA2018021500931), Feb 14, 2018: Doug MD88. TAPE. MISSING. AWR AD INITIAL INSPECTION, MISSING AND WORN TIE TAPE ON AUX HYDRAULIC PUMP POWER FEEDER WIRING. TIE TAPE WAS REPLACED PE (N933DL)
- [SDR HNAA2017070700228](https://openairdocs.org/sdr/HNAA2017070700228), Jul 5, 2017: Dhav DHC8311. PUMP. MALFUNCTIONED. NR 1 STANBY PUMP WILL NOT COME ON. RESET THE CIRCUIT BREAKER. OPS NORMAL. NO DEFECTS. OK FOR SERVICE. (N336EN)
- [SDR DALA2017050103520](https://openairdocs.org/sdr/DALA2017050103520), Apr 27, 2017: Doug MD88. CIRCUIT BREAKER. DEFECTIVE. RIGHT HYDRAULIC AUX PUMP CIRCUIT BREAKER POPPED AFTER TAKEOFF. CHECKED RT HYD AUX PUMP WIRING REF W/C 2920-01098-0201. F (N993DL)
- [SDR IXXA20170201054](https://openairdocs.org/sdr/IXXA20170201054), Jan 27, 2017: Boeing 767223. PUMP. INOPERATIVE. ON APPROACH SELECTED FLAPS 1. FLAPS WENT TO 1, EICAS MESSAGE CENTER HYDRAULIC SYS PRESS ANNUNCIATED. ON STATUS PAGE C HY (N714AX)
- [SDR SWAA2016110109292](https://openairdocs.org/sdr/SWAA2016110109292), Oct 31, 2016: Boeing 7378H4. PUMP. LOW PRESSURE. DIVERSION, B SYSTEM HYDRAULIC LOSS WITH LOW PRESSURE LIGHT ILLUMINATED. R&R NR 2 ENGINE DRIVEN PUMP PER MM. (N500WR)
- [SDR AALA201610139005](https://openairdocs.org/sdr/AALA201610139005), Oct 9, 2016: Airbus A321211. PTU. FAULTY. GREEN SYSTEM RSVR OVHT MESSAGE ON CLIMB OUT. APPLIED QRH PROCEDURE, FLIGHT DECLARED AN EMERGENCY AND RETURNED TO BOS WIT (N171US)
- [SDR CALA2016020995095](https://openairdocs.org/sdr/CALA2016020995095), Feb 5, 2016: Airbus A320232. PTU. MALFUNCTIONED. LOST GREEN QTY, PFR INDICATES HYD G RSVR LO LVL, HYD G ENG 1 PUMP LO PR & HYD G SYS LO PR. R & R THE PTU IAW AMM 29-23-4 (N425UA)
- [SDR AALA201512249012](https://openairdocs.org/sdr/AALA201512249012), Dec 23, 2015: Airbus A320232. PTU. LEAKING. AIRCRAFT WAS GNDED. DURING CRUISE RECEIVED A YELLOW ELEC PUMP OVERHEAT WARNING. EMER DECLARED. R & R PTU FOR LEAKING IAW (N650AW)
- [SDR F3LA2015051801133](https://openairdocs.org/sdr/F3LA2015051801133), May 16, 2015: Airbus A320214. PUMP. FAILED. HYDRAULIC BLUE SYS LOW PRESS. R & R BLUE HYD PUMP. LEAK & OPERATIONAL CHECKED GOOD IAW AMM 29-12-51 PAGE BLOCK 401. (N227FR)
- [SDR AALA20140608008](https://openairdocs.org/sdr/AALA20140608008), Jun 8, 2014: Doug DC983. PUMP. LEAKING. LOSS OF RT SIDE HYD SYS DURING APPROACH. FLIGHT LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED LEAKING ELE (N76201)
- [SDR ERAA20140023](https://openairdocs.org/sdr/ERAA20140023), Apr 26, 2014: Dhav DHC8106. PUMP. OVERTEMP. NUMBER 1 STBY PUMP HYD HOT LIGHT ILLUMINATED. WHEN NR 1 STBY PUMP SELECTED TO NORM IN FIGHT, HYD PRESS GRADUALLY DECREAS (N884EA)
- [SDR AALA20130311004](https://openairdocs.org/sdr/AALA20130311004), Mar 11, 2013: Boeing 757223. PUMP. FAILED. DFW - CREW REPORTED NUMBER 2 CENTER HYDRAULIC OVERHEAT MESSAGE FOLLOWED BY EICAS MESSAGE AND LOSS OF SYSTEM. EMERGENCY D (N665AA)
- [SDR HNAA2012112101065](https://openairdocs.org/sdr/HNAA2012112101065), Nov 21, 2012: Dhav DHC8102. PUMP. FAILED. NR 2 STANDBY PUMP CIRCUIT BREAKER TRIPPED IN FLIGHT. R & R NR 2 STANDBY HYD PUMP. OPS AND LEAKED CHECKED GOOD IAW MM 29- (N837EX)
- [SDR J8UR20120326002](https://openairdocs.org/sdr/J8UR20120326002), Mar 23, 2012: Beech B300C. HANDPUMP. MALFUNCTIONED. DURING EMERGENCY LANDING GEAR OPERATIONAL AND FUNCTIONAL (GROUND) CHECK, EMERGENCY HANDPUMP HANDLE SEPERATED FROM PUMP H (N6241L)
- [SDR UALA2012012300460](https://openairdocs.org/sdr/UALA2012012300460), Jan 23, 2012: Airbus A320232. PUMP. FAULTY. REMOVED RAT REF AMM 29-22-51, DUE TO EQ CALLOUT. REMOVED RAT. REPLACED RAT & PUMP. (N443UA)
- [SDR 3PRA2012011200001](https://openairdocs.org/sdr/3PRA2012011200001), Jan 12, 2012: Skrsky S61N. PUMP. FAILED. DURING CRUISE FLIGHT, CONTROL STIFFNESS WAS EXPERIENCED IN THE CYCLIC CONTROLS. PIC CONFIRMED THAT THE MASTER CAUTION, A (N261F)
- [SDR AALA20111119JFK01](https://openairdocs.org/sdr/AALA20111119JFK01), Nov 19, 2011: Boeing 757223. PUMP. FAILED. JFK - CREW REPORTED LOSS OF RIGHT HYDRAULIC SYSTEM. EMERGENCY DECLARED FLIGHT LANDED JFK WITHOUT INCIDENT. AIRCRAFT REMO (N174AA)
- [SDR ZKFR201109233149](https://openairdocs.org/sdr/ZKFR201109233149), Sep 23, 2011: Hawbee 4000. PUMP. LEAKING. ERS PUMP LEAKING. FOUND LEAKING FROM OVERBOARD DRAIN LINE. R & R ERS PUMP ASSY. (N78KN)
- [SDR UALA2011090104711](https://openairdocs.org/sdr/UALA2011090104711), Aug 31, 2011: Boeing 757222. PRESSURE SWITCH. FAULTY. ENGINE DRIVEN PUMP (EDP) - HYDRAULIC LOW PRESS LIGHT DID NOT ILLUMINATE BUT EICAS MESSAGE ' HYD ENG PUMP' DID DISPLAY WI (N589UA)
- [SDR CA110513007](https://openairdocs.org/sdr/CA110513007), May 9, 2011: Airbus A310304. BUSHING. SEIZED. WHEN PERFORMING TASK 292500-16-1 (OPS CHECK OF RAT UPLOCK MECHANISM) DURING A-06 CHECK, RAM AIR TURBINE (RAT) FAILED TO 
- [SDR ZZDA2010211](https://openairdocs.org/sdr/ZZDA2010211), Mar 22, 2010: Boeing 717200. PUMP. FAILED. RIGHT HYDRAULIC SYSTEM FAIL. REMOVED AND REPLACED AUX PUMP IAW MM 29-21. P/N OFF 861555, S/N OFF MX596730. (N930AT)
- [SDR CA090807007](https://openairdocs.org/sdr/CA090807007), Jul 30, 2009: Aerosp ATR42300. PUMP. UNKNOWN. (CAN) AUX HYD PUMP POPPING NORMAL SUPPLY CIRCUIT BREAKER DURING GROUND OPERATIONS.
- [SDR CA090206003](https://openairdocs.org/sdr/CA090206003), Feb 2, 2009: Bombdr DHC8400. POWER UNIT. FAILED. DURING TAKEOFF ROLL (40KTS) NR 1 STBY HYD PUMP HOT CAUTION LIGHT ILLUMINATED. TAKEOFF ABORTED AIRCRAFT RETURNED TO GATE.
- [SDR 4516201192008](https://openairdocs.org/sdr/4516201192008), Jan 19, 2008: Lear 45LEAR. PUMP. OUT OF ADJUST. LT AND RT OB BRAKES FAIL LIGHT ILLUMINATED AFTER GEAR EXTENSION (AMBER CAS). CREW DECLARED AN IFE. LANDING AND ROLLOUT W (N426FX)
- [SDR NOMB071001001](https://openairdocs.org/sdr/NOMB071001001), Oct 1, 2007: Boeing 727200RE. PUMP. INOPERATIVE. NR 1 ELECTRICAL HYDRAULIC PUMP: NO PRESSURE/POPS CIRCUIT BREAKER ON STARTUP FOR DEPARTURE. (N727M)
- [SDR 07FDEA03201](https://openairdocs.org/sdr/07FDEA03201), Aug 28, 2007: Boeing 727233. MOTOR. FAILED. LOST SYS "A" HYD QUANTITY. "A" PUMPS WERE OFF FOR LESS THAN 15 MINUTES. QUANTITY REMAINED JUST ABOVE ZERO AFTER COMPLETE (N223FE)
- [SDR QXEA200602955](https://openairdocs.org/sdr/QXEA200602955), Nov 6, 2006: Dhav DHC8202. PUMP. MALFUNCTIONED. SEA FLIGHT NR 2162, NR 2 STANDBY HYDRAULIC PRESSURE GAUGE SHOW A READING BETWEEN 200-500 PSI. MAINTENANCE REPLACED NR 1  (N356PH)
- [SDR NSVA200600190](https://openairdocs.org/sdr/NSVA200600190), Oct 31, 2006: Saab 340B. PRESSURE SWITCH. FAILED. IN AUTO MODE HD PUMP CYCLES 2100 TO 3500 PSI FREQUENTLY (1:10 TO 1:30 BETWEEN RUNS DURING NORMAL TAXI) EMER ACC AT 3600  (N343CJ)
- [SDR 0602049954](https://openairdocs.org/sdr/0602049954), Sep 24, 2006: Doug DC931. PUMP. LEAKING. ABOUT 15 MINUTES PRIOR TO TOUCHDOWN AT STL THE FLIGHT CREW NOTICED THAT THE LT HYDRAULIC SYSTEM FLUID QUANTITY DECREASED (N921RW)
- [SDR 0602040995](https://openairdocs.org/sdr/0602040995), Sep 24, 2006: Doug DC931. PUMP. LEAKING. ABOUT 15 MINUTES PRIOR TO TOUCHDOWN AT STL THE FLIGHT CREW NOTICED THAT THE LEFT HYDRAULIC SYSTEM FLUID QUANTITY DECREAS (N921RW)
- [SDR AALA20060645](https://openairdocs.org/sdr/AALA20060645), Sep 2, 2006: Doug DC982. PUMP. INOPERATIVE. DFW - LOSS OF RIGHT HYDRAULIC SYSTEM QUANTITY PRIOR TO LANDING. LANDED DFW WITHOUT INCIDENT. REPLACED MAIN LANDING GEAR  (N262AA)
- [SDR XN0A1331](https://openairdocs.org/sdr/XN0A1331), May 23, 2006: Boeing 727225. PUMP. MALFUNCTIONED. TEN MINUTES INTO FLIGHT SYSTEM -B- HYDRAULIC OVERHEAT LIGHT AND NR 2B HYDRAULIC PUMP LIGHT CAME ON SYSTEM -B- PRESSURE A (N755DH)
- [SDR MASA200601352](https://openairdocs.org/sdr/MASA200601352), May 17, 2006: Dhav DHC8202. SPU. MALFUNCTIONED. ASH 7030 DEN. RUD PRESS, RUD FULL PRESS, & RUD HYD MASTER CTNS. MAINTENANCE REMOVED AND REPLACED NR 2 SPU. (N456YV)
- [SDR ABXA060159](https://openairdocs.org/sdr/ABXA060159), Apr 11, 2006: Doug DC863F. PUMP. LEAKING. LOSS OF HYDRAULIC QUANTITY NOTED DURING DESCENT. FOUND STANDBY RUDDER PUMP OVERBOARD DRAIN LEAKING. REMOVED AND REPLACED (N826AX)
- [SDR TIM2006F00000](https://openairdocs.org/sdr/TIM2006F00000), Jan 17, 2006: Beech 1900C. RELAY. FAILED. LANDING GEAR DID NOT EXTEND WHEN SELECTED. PILOT EXTENDED GEAR MANUALLY AND LANDED WITHOUT INCIDENT. MAINTENANCE DETERMI (N197GA)
- [SDR AU510001989](https://openairdocs.org/sdr/AU510001989), Nov 10, 2005: Fokker F28MK0100. PUMP. FAILED. NR 2 SYSTEM HYDRAULIC PUMP FAILED. INVESTIGATION CONTINUING.
- [SDR RYNA200500028](https://openairdocs.org/sdr/RYNA200500028), Aug 29, 2005: Boeing 737201. PUMP. OVERHEATED. NR 2 B-SYSTEM ELECTRIC HYDRAULIC PUMP OVERHEATED, RETURNED TO ACY DUE TO DECREASING A-SYSTEM HYDRAULIC QUANTITY. REMOVED (N242US)
- [SDR HNAA0500077](https://openairdocs.org/sdr/HNAA0500077), Aug 22, 2005: Dhav DHC8102. CIRCUIT BREAKER. FAILED. LOSS OF THE NR1 STBY PUMP PRESSURE INDICATION ON LANDING AND LOSS OF NORMAL BRAKES. REMOVED AND REPLACED RT WHEEL WELL R (N806EX)
- [SDR QXEA200501136](https://openairdocs.org/sdr/QXEA200501136), Jul 26, 2005: Dhav DHC8202. SWITCH. MALFUNCTIONED. NR 2 STANDBY PUMP HOT CAUTION LIGHT ILLUMINATED AFTER STANDBY HYDRAULIC PRESSURE WAS SELECTED "NORM" AFTER TAKEOFF. MAST (N369PH)
- [SDR QXEA200501112](https://openairdocs.org/sdr/QXEA200501112), Jul 16, 2005: Dhav DHC8202. PUMP. INOPERATIVE. PDX - NR 1 STANDBY HYDRAULIC PUMP INOP. UPON INSPECTION, FOUND CIRCUIT BREAKER POPPED OPEN IN AC CONTACTOR BOX (2921-CB8 (N346PH)
- [SDR RAIA00506016](https://openairdocs.org/sdr/RAIA00506016), Jun 13, 2005: Emb EMB145LR. FUSE. INOPERATIVE. FLT 5761 - STL - NR 1 ELECTRIC HYDRAULIC PUMP INOP. MAINTENANCE REMOVED AND REPLACED THE FUSE FOR THE NR 1 HYDRAULIC PUM (N822HK)

All 138: https://openairdocs.org/jasc/2923/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 (11,279 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 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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