# Service difficulty reports: N994Z, cancelled Mar 21, 2013 A list on [N994Z, cancelled Mar 21, 2013](https://openairdocs.org/deregistered/N994Z-2013-03-21.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR 0501129981](https://openairdocs.org/sdr/0501129981.md): Clamp · leaking · Jul 25, 2005 · N994Z · Doug DC931 · Air Distribution System > DURING CRUISE FLIGHT AT FL290 WITH AIRFOIL ANTI-ICE SYSTEM ON, THE CABIN STARTED CLIMBING AT 300 FT/MIN. INITIATED DESCENT AND COMPLIED WITH THE RED BORDERED CHECK LIST. WHEN THE ANTI-ICE SYSTEM WAS SWITCHED OFF THE CREW WAS ABLE TO CONTROL CABIN PRESSURE BUT - [SDR 0203709981](https://openairdocs.org/sdr/0203709981.md): Stiffener · corroded · Oct 31, 2002 · N994Z · Doug DC931 · Fuselage Miscellaneous Structure > DURING H CHECK, CORROSION WAS FOUND ON THE UPPER SURFACE OF STATION 756 BULKHEAD TEE BETWEEN LONGERONS 29R AND 30. REPAIRED PER EA. - [SDR 0203699981](https://openairdocs.org/sdr/0203699981.md): Floorbeam · corroded · Oct 28, 2002 · N994Z · Doug DC931 · Fuselage Main, Floor Beam > DURING HCK IN ATL, CORROSION WAS FOUND IN THE VERTICLE FLANGE OF THE STATION 200 FLOORBEAM LOWER CAP. THE CORROSION EXTENDED TO THE LEFT OF STATION X=0 ALL THE WAY TO THE END OF THE PART. REPAIRED PER EA 99-190813. - [SDR 0201609981](https://openairdocs.org/sdr/0201609981.md): Flex Line · leaking · May 14, 2002 · N994Z · Doug DC931 · Hydraulic System, Main > INBOUND TO VPS, THE AIRCRAFT LOST THE HYDRAULIC FLUID FROM THE RIGHT SYSTEM. CREW FOLLOWED COM PROCEDURES AND WAS ABLE TO LAND WITHOUT FURTHER INCIDENT IN VPS. MAINTENANCE FOUND A PREVIOUSLY INSTALLED TEMP FLEX LINE LEAKING. REPLACED THE FLEX LINE WITH TWO NEW - [SDR 0201329981](https://openairdocs.org/sdr/0201329981.md): Controller · malfunctioned · Apr 24, 2002 · N994Z · Doug DC931 · Cabin Pressure Controller > AIRCRAFT WAS CRUISING AT FL330 WHEN THE CABIN PRESSURE ANNUNCIATOR LIGHT ILLUMINATED AND CABIN ALTITUDE WAS APPROACHING 10,000 FEET. WING ANTI-ICE AND ENGINE ANTI-ICE WERE BOTH ON AT THE TIME AND TURNING THEM OFF DID NOT HELP TO REGAIN CABIN PRESSURE. CREW D - [SDR 0201329961](https://openairdocs.org/sdr/0201329961.md): Controller · malfunctioned · Apr 24, 2002 · N994Z · Doug DC931 · Cabin Pressure Controller > AIRCRAFT WAS CRUISING AT FL330 WHEN THE CABIN PRESSURE ANNUNCIATOR LIGHT ILLUMINATED AND CABIN ALTITUDE WAS APPROACHING 10,000 FEET. WING ANTI-ICE AND ENGINE ANTI-ICE WERE BOTH ON AT THE TIME AND TURNING THEM OFF DID NOT HELP TO REGAIN CABIN PRESSURE. CREW D - [SDR 0201139981](https://openairdocs.org/sdr/0201139981.md): Slide · failed · Apr 4, 2002 · N994Z · Doug DC931 · Escape Slide > GROUND SERVICE AGENT DROPPED THE TAIL CONE WHILE TRYING TO GAIN ENTRY INTO THE AIRCRAFT. THE EVACUATION SLIDE DID NOT DEPLOY WHEN THE TAIL CONE DROPPED. MAINTENANCE REPLACED THE TAIL CONE. DROPPED CHECK TESTED THE TAIL CONE AND SLIDE ASSEMBLY AND THE SLIDE - [SDR 0200459981](https://openairdocs.org/sdr/0200459981.md): Stabilizer · cracked · Feb 4, 2002 · N994Z · Doug DC931 · Vertical Stabilizer > During overnight in MSP, a crack was found on the verticle stabilizer front spar left lower chord.Repaired per EA 99-187946 - [SDR 0101759981](https://openairdocs.org/sdr/0101759981.md): Power Supply · inoperative · May 12, 2001 · N994Z · Doug DC931 · Emergency Lighting > DURING LINE CHECK, FOUND EMERGENCY LIGHTS INOPERATIVE AT CATWALK AND TAIL CONE RELEASE HANDLE. REPLACED SEALED POWER SUPPLY IAW DC-9 WM 33-51-04. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE. - [SDR 9904349981](https://openairdocs.org/sdr/9904349981.md): Controller · failed · Oct 17, 1999 · N994Z · Doug DC931 · Cabin Pressure Controller > DURING CLIMB-OUT FROM PHL, LOSS OF CABIN PRESSURIZATION OCCURRED AT APPROXIMATELY 27,000 FEET. CREW EXECUTED AN EMERGENCY DESCENT TO 10,000 FEET. RED CABIN PRESSURE WARNING LIGHT ILLUMINATED AND CABIN ALTITUDE CLIMBED TO 12,000 FEET. FLIGHT WAS RETURNED TO - [SDR 9904609981](https://openairdocs.org/sdr/9904609981.md): Frame · worn · Oct 6, 1999 · N994Z · Doug DC931 · Fuselage Main, Frame > DURING M CHECK, FOUND WEAR DAMAGE ON THE FORWARD FLANGE OF THE LOWER TEE CAP. THE DAMAGE WAS CAUSED BY A STEEL DOUBLER INSTALLED AT THE EDGE OF THE APU DOOR WHERE IT CONTACTED THE FRAME LOWER TEE CAP FORWARD FLANGE, FS 1038. THE DAMAGE WAS BLENDED OUT. REPA - [SDR 9900319981](https://openairdocs.org/sdr/9900319981.md): Pulley · dirty · Feb 1, 1999 · N994Z · Doug DC931 · Landing Gear Retraction/Extension System > AFTER TAKEOFF, GEAR HANDLE WOULD NOT GO TO UPLATCH POSITION OR DOWN POSITION. CREW UTILIZED EMERGENCY GEAR EXTENSION PROCEDURES AND FLIGHT WAS RETURNED TO DTW. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED LANDING GEAR CONTROL LEVER AND FOUND DEBR - [SDR 9805229981](https://openairdocs.org/sdr/9805229981.md): Engine · failed · Mar 29, 1998 · N994Z · Doug DC931 · Engine (Turbine/Turboprop) > DURING CLIMB AT 8,000 FEET, THE LEFT ENGINE FLAMED OUT. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE, OPERATIONAL CHECK OK. - [SDR 9805339981](https://openairdocs.org/sdr/9805339981.md): Striker Plate · out of adjust · Mar 28, 1998 · N994Z · Doug DC931 · Door Warning System > DURING CLIMB, AFT CARGO DOOR WARNING LIGHT ILLUMINATED. FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. DURING LANDING LIGHT WENT OUT. MAINTENANCE ADJUSTED STRIKER PLATE AT CARGO DOOR, FUNCTIONAL CHECK OK. - [SDR 9801999981](https://openairdocs.org/sdr/9801999981.md): Transceiver · malfunctioned · Feb 1, 1998 · N994Z · Doug DC931 · Weather Radar System > WEATHER RADAR SYSTEM FAILED AFTER TAKEOFF. FLIGHT WAS RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED RADAR TRANSCEIVER, OPERATIONAL CHECK NORMAL. - [SDR 9718389881](https://openairdocs.org/sdr/9718389881.md): Frame · cracked · Aug 21, 1997 · N994Z · Doug DC931 · Fuselage Main, Frame > DURING H CHECK, FOUND A CRACK IN FRAME AT LONGERON 18R, FS 712. REPAIRED PER EA 98-113049. - [SDR 9718379881](https://openairdocs.org/sdr/9718379881.md): Keelbeam · corroded · Aug 14, 1997 · N994Z · Doug DC931 · Fuselage Main, Keel > DURING H CHECK, FOUND CORROSION ON KEEL BEAM WEB BETWEEN FS 734-775. REPAIRED PER EA 98-113059. - [SDR 9715219881](https://openairdocs.org/sdr/9715219881.md): Fitting · corroded · Aug 11, 1997 · N994Z · Doug DC931 · Fuselage Miscellaneous Structure > DURING H-CHECK, FOUND CORROSION ON FLOOR SUPPORT FITTINGS AT FS 160, LBL 15 AND 42. REPLACED FITTINGS PER SRM 53-01, 51-10-2, AND 51-30-2. - [SDR 9718399881](https://openairdocs.org/sdr/9718399881.md): Skin · corroded · Aug 3, 1997 · N994Z · Doug DC931 · Fuselage Main, Plate/Skin > DURING H CHECK, FOUND CORROSION ON SKIN AT FS 693, LONGERON 30. REPAIRED PER EA 98-113057. - [SDR 9718409881](https://openairdocs.org/sdr/9718409881.md): Frame · cracked · Jul 31, 1997 · N994Z · Doug DC931 · Fuselage Main, Frame > DURING H CHECK, FOUND CRACK J ANGLE AT Z FRAME FS 207, LONGERON 5L. REPAIRED PER EA 98-113061. - [SDR 9714539981](https://openairdocs.org/sdr/9714539981.md): Pt7 Line · cracked · Jul 27, 1997 · N994Z · Doug DC931 · Engine Pressure Ratio (EPR) > AS TAKEOFF POWER WAS APPLIED, THE RIGHT ENGINE EPR INDICATION WOULD NOT REACH TARGET EPR. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE REPLACED THE RIGHT ENGINE EPR TRANSMITTER, OPERATIONAL CHECK OK. - [SDR 9700949981](https://openairdocs.org/sdr/9700949981.md): Fuel Heat Valve · failed · Jan 15, 1997 · N994Z · Doug DC931 · Engine Anti-Icing System > DURING CLIMB, THE LEFT ENGINE FUEL HEAT LIGHT ILLUMINATED. CREW REDUCED POWER ON THE LEFT ENGINE, RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE FUEL HEAT VALVE, OPERATIONAL CHECK OK. - [SDR 9627039981](https://openairdocs.org/sdr/9627039981.md): Skin · corroded · Dec 26, 1996 · N994Z · Doug DC931 · Fuselage Main, Plate/Skin > DURING PERIODIC CHECK, FOUND DOUBLER AT FORWARD BAG BIN DOOR JAMB WITH SEVERAL AREAS OF CORROSION FROM FS 362 TO FS 435, INSIDE AND OUTSIDE SKIN AT BOTTOM SIDE OF DOOR OPENING. CUT LOWER SECTION OF DOOR DOUBLER AT FORWARD AND AFT SIDE. INSTALLED REPAIR DOUBL - [SDR 9627919981](https://openairdocs.org/sdr/9627919981.md): Release Mech · malfunctioned · Dec 19, 1996 · N994Z · Doug DC931 · Aerodynamic Fairings > DURING H-CHECK, FOUND THAT EXCESSIVE FORCE WAS REQUIRED TO RELEASE THE TAILCONE. ADJUSTED TAILCONE RELEASE MECHANISM, FUNCTIONAL TEST OK. - [SDR 9626379981](https://openairdocs.org/sdr/9626379981.md): Bulkhead · cracked · Dec 12, 1996 · N994Z · Doug DC931 · Fuselage Main, Bulkhead > DURING PERIODIC CHECK, FOUND NOSE WHEEL WELL PRESSURE PANEL CRACKED AT FS 110 AT INBOARD VERTICAL BEAM ON RIGHT SIDE. FABRICATED DOUBLER AND REPAIRED PER EA 99-111924. - [SDR 9626369981](https://openairdocs.org/sdr/9626369981.md): Rib · cracked · Dec 11, 1996 · N994Z · Doug DC931 · Vertical Stabilizer, Spar/Rib > DURING PERIODIC CHECK, FOUND MULTIPLE VERTICAL STABILIZER RIBS CRACKED AT AFT ATTACH POINTS. REPAIRED PER EA 99-111928. - [SDR 9626179981](https://openairdocs.org/sdr/9626179981.md): Battery Pack · discharged · Dec 7, 1996 · N994Z · Doug DC931 · Emergency Lighting > DURING PERIODIC CHECK, THE RIGHT NACELLE EMERGENCY LIGHT FAILED TEN MINUTE TEST. REPLACED BATTERY PACK, OPERATIONAL CHECK NORMAL. - [SDR 9626149981](https://openairdocs.org/sdr/9626149981.md): Slide · low battery · Dec 7, 1996 · N994Z · Doug DC931 · Escape Slide > DURING PERIODIC CHECK, FORWARD SERVICE DOOR EVACUATION SLIDE FAILED BATTERY TEST. REPLACED SLIDE. - [SDR 9622099981](https://openairdocs.org/sdr/9622099981.md): Power Supply · inoperative · Oct 15, 1996 · N994Z · Doug DC931 · Emergency Lighting > DURING LINE MAINTENANCE INSPECTION, FOUND LEFT NACELLE EMERGENCY LIGHT INOPERATIVE. REPLACED POWER SUPPLY, OPERATIONAL CHECK NORMAL. - [SDR 9622539981](https://openairdocs.org/sdr/9622539981.md): Frame · cracked · Oct 9, 1996 · N994Z · Doug DC931 · Fuselage Main, Frame > DURING M-CHECK, FOUND A CRACK IN THE FS 617 FRAME AT THE LEFT SIDE FLOOR BEAM LUG. REPAIRED BEAM (PSE 53.09.015) PER EA 99-11039. - [SDR 9622529981](https://openairdocs.org/sdr/9622529981.md): Skin · cracked · Oct 9, 1996 · N994Z · Doug DC931 · Fuselage Main, Plate/Skin > DURING M-CHECK, FOUND A CRACK IN THE FORWARD ENTRY DOOR AFT SIDE AT THE 4TH STOP. REPAIRED SKIN PER EA 99-111030. - [SDR 9612139981](https://openairdocs.org/sdr/9612139981.md): Power Supplies · inoperative · Jun 2, 1996 · N994Z · Doug DC931 · Emergency Lighting > DURING LINE MAINTENANCE INSPECTION, FOUND AFT CABIN OVERHEAD EMERGENCY LIGHTS INOPERATIVE. REPLACED POWER SUPPLIES, OPERATIONAL CHECK NORMAL. - [SDR 9612129981](https://openairdocs.org/sdr/9612129981.md): Batteries · discharged · Jun 2, 1996 · N994Z · Doug DC931 · Emergency Lighting > DURING LINE MAINTENANCE INSPECTION, FOUND FORWARD CABIN OVERHEAD EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES, OPERATIONAL CHECK NORMAL. - [SDR 9508529981](https://openairdocs.org/sdr/9508529981.md): Radar Tr Unit · malfunctioned · May 18, 1995 · N994Z · Doug DC931 · Weather Radar System > WEATHER RADAR SYSTEM FAILED AFTER TAKEOFF. FALSE RETURNS WERE BEING PAINTED AND SPOKING WAS ALSO APPARENT. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED RADAR TRANSCEIVER. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE. - [SDR 9502909981](https://openairdocs.org/sdr/9502909981.md): Fitting · cracked · Feb 16, 1995 · N994Z · Doug DC931 · Fuselage Miscellaneous Structure > DURING PERIODIC CHECK, FOUND TWO.5 INCH CRACK IN THE 'SHOVEL' FITTING FS 980 AT LONGERON 30. REPLACED FITTING PER SRM 51-30-0. - [SDR 9502599981](https://openairdocs.org/sdr/9502599981.md): Clips · out of adjust · Feb 13, 1995 · N994Z · Doug DC931 · Aerodynamic Fairings > DURING PERIODIC CHECK, FOUND THAT EXCESSIVE FORCE WAS REQUIRED TO REMOVE BOTH THE INTERIOR AND EXTERIOR HANDLES FROM THE CLIPS. ADJUSTED THE INTERIOR AND EXTERIOR CLIPS. - [SDR 9502089981](https://openairdocs.org/sdr/9502089981.md): Blkhd Web · oil canned · Feb 1, 1995 · N994Z · Doug DC931 · Fuselage Main, Bulkhead > DURING PERIODIC CHECK, FOUND OIL CANNING IN THE LEFT LAVATORY BULKHEAD WEB AT THE INBOARD LIGHTENING HOLE. REPAIRED PER EA 99-096894. ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet' WHERE n_number = 'N994Z' AND deregistration_id = 'N994Z-2013-03-21' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/deregistered/N994Z-2013-03-21/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.