# Service difficulty reports: Grumman G-21A A list on [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a.md). Newest first. General aviation reporting is voluntary. - [SDR CA150904009](https://openairdocs.org/sdr/CA150904009.md): Control Cable · failed · May 27, 2015 · Grumav G21A · Propeller Controlling System > (CAN) THE PROP GOVERNOR CONTROL CABLE CLAMPS ARE SLIPPING ON ENGINE MOUNT OVER TIME CREATING A SLIGHT DECREASE IN TAKE OFF RPM. - [SDR CA150417013](https://openairdocs.org/sdr/CA150417013.md): Control Arm · backed out · Apr 15, 2015 · Grumav G21A · Fuel Control/Reciprocating Engines > (CAN) THE ROLL PIN ATTACHING THE CARBURETOR MIXTURE CONTROL ARM TO THE ASSY WAS ABLE TO BACK OUT FAR ENOUGH TO MAKE CONTACT WITH THE MIXTURE STOP. NO SECONDARY SAFETY, LOCKWIRE WAS FOUND RETAINING THIS ROLL PIN ON THIS ASSEMBLY OR ANY REMAINING UNITS IN STOCK - [SDR PNSA090102](https://openairdocs.org/sdr/PNSA090102.md): Bolt · out of adjust · Jan 24, 2009 · N985R · Grumav G21A · Nose/Tail Landing Gear > ON LANDING ROLLOUT THE PILOT NOTICED THAT THE TAIL WHEEL HAD COLLAPSED AND THE KEEL AT THE AFT STEP WAS DRAGGING ON THE RUNWAY. THE PILOT TAXIED CLEAR OF THE RUNWAY. MAINTENANCE FOUND THAT A BOLT INSTALLED AT THE TAIL WHEEL LOCK ACTUATOR WAS CATCHING ON THE - [SDR 2006FA0000740](https://openairdocs.org/sdr/2006FA0000740.md): Exhaust Duct · cracked · Aug 4, 2006 · N22932 · Grumav G21A · Engine Collector/Tailpipe/Nozzle > EXHAUST DUCT ASSY CRACKED AND MISSING PARTS. - [SDR PNSA051105](https://openairdocs.org/sdr/PNSA051105.md): Cowling · departed · Nov 17, 2005 · N22932 · Grumav G21A · Engine Cowling System > WHILE IN CRUISE FLIGHT THE LT ENGINE COWLING DEPARTED THE AIRCRAFT. THE COWLING'S WAS NOT RECOVERED, FLIGHT WAS OVER WATER. AN UNEVENTFUL LANDING WAS MADE. SINCE THE FLIGHT WAS OVER WATER IT COULD NOT BE DETERMINED WHY THE COWLINGS DEPARTED THE AIRCRAFT. - [SDR PNSA050301](https://openairdocs.org/sdr/PNSA050301.md): Coupling · broken · Mar 9, 2005 · N741 · Grumav G21A · Landing Gear Retraction/Extension System > LT MAIN LANDING GEAR WOULD NOT RETRACT OR EXTEND. HUNG UP IN MID TRAVEL. DOVE AIRCRAFT AND PERFORMED SUDDEN PULL UP AND LANDING GEAR WENT TO DOWN AND LOCK POSITION. AIRCRAFT RETURNED TO DUT AND MADE A NORMAL LANDING. MAINTENANCE FOUND LT WORM GEARBOX COUPL - [SDR CA050425004](https://openairdocs.org/sdr/CA050425004.md): Link Rod · broken · Jan 5, 2005 · Grumav G21A · Reciprocating Engine Cylinder Section > AIRCRAFT ABORTED TAKEOFF DUE TO ENGINE POWER LOSS. ENGINE SENT FOR REPAIR AND LINK ROD FOR NR 1 CYLINDER DISCOVERED BROKEN AT LINK PIN END. DAMAGE ALSO OBSERVED AT CYLINDER SKIRT. STRIP REPORT SUGGESTS LOSE BUSHING STARTING TO FAIL IN LINKROD WAS CONTRIBU - [SDR DXTA200300192](https://openairdocs.org/sdr/DXTA200300192.md): Control Cable · chafed · Nov 29, 2003 · N641 · Grumav G21A · Aileron Control System > PERFORMED AILERON WING CABLE INSPECTION PER CESSNA ASL560XL-27-12, FOUND CABLES CHAFED/BROKEN BEYOND MANUFACTURER'S LIMITS. REMOVED AND REPLACED LEFT AND RIGHT WING AILERON CABLES IAW CESSNA 560XL MM CHAPTER 27-10-03. - [SDR CA030609006](https://openairdocs.org/sdr/CA030609006.md): Engine · contaminated · Jun 7, 2003 · Grumav G21A · Reciprocating Engine Oil System > (CAN) DURING REGULARLY SCHEDULED MAINTENANCE, METAL WAS FOUND IN THE OIL SCREEN OF THE RT ENGINE IN SUFFICIENT QUANTITY TO NECESSITATE ENGINE REMOVAL. - [SDR CA030605019](https://openairdocs.org/sdr/CA030605019.md): Engine · making metal · May 30, 2003 · Grumav G21A · Reciprocating Engine Oil System > (CAN) DURING REGULAR MAINTENANCE INSPECTION METAL WAS FOUND IN THE OIL SCREEN IN SUFFICIENT QUANTITY TO WARRANT ENGINE REMOVAL. - [SDR CA020912006](https://openairdocs.org/sdr/CA020912006.md): Clamp · cracked · Aug 14, 2002 · Grumav G21A · Propeller Blade Section > (CAN) PROPELLER EXPERIENCED VIBRATIONS, WENT IN FOR SCHEDULED MAINTENANCE, CRACKED CLAMP WAS FOUND. ALSO BLADES HAD SLIPPED IN CLAMPS. PROPELLER WAS SENT IN FOR OVERHAUL AND REPAIR. - [SDR CA020821003](https://openairdocs.org/sdr/CA020821003.md): Clamp · cracked · Aug 14, 2002 · Grumav G21A · Propeller Blade Section > (CAN) DURING A SCHEDULED INSPECTION, THE NR 3 REAR BLADE CLAMP WAS FOUND TO HAVE A 2 INCH CRACK ACROSS IT. THE PROPELLER WAS REMOVED AND SENT IN FOR OVERHAUL. - [SDR CA020808003](https://openairdocs.org/sdr/CA020808003.md): Case · cracked · Jul 23, 2002 · Grumav G21A · Reciprocating Engine Front Section > (CAN) DURING ROUTINE MAINTENANCE A 3 INCH CRACK WAS FOUND IN THE FORWARD NOSE CASE STARTING JUST ABOVE THE OIL SUMP AND PROGRESSING UPWARD. THE ENGINE WAS REPLACED. - [SDR DHL2001741004](https://openairdocs.org/sdr/DHL2001741004.md): Windshield · failed · Mar 27, 2001 · N741 · Grumav G21A · Flight Compartment Windows > CAPT WINDSHIELD SHATTERED AT FLIGHT LEVEL 350. ABNORMAL PROCEDURES ACCOMPLISHED. R&R L-1 WINDOW WITH SERVICABLE UNIT PER M/M 56-11-11. A/C OK FOR SERVICE. STATUS - CLOSED. - [SDR CA000925034](https://openairdocs.org/sdr/CA000925034.md): Housing · cracked · Aug 26, 2000 · Grumav G21A · Fuel Control/Reciprocating Engines > (CAN) CRACK LINE DEVELOPED AT MIXTURE ADJUSTING LEVER ONE INCH BELOW THE THROTTLE SHAFT AND PROPAGATED IN A HORIZONTAL DIRECTION AROUND THE CIRCUMFERENCE OF THE THROTTLE BODY UNIT. ENGINE DEVELOPED AN IDLING PROBLEM AND ON INSPECTION, CRACK FAULT WAS DETECTED - [SDR CA000518001](https://openairdocs.org/sdr/CA000518001.md): Connecting Rod · broken · May 3, 2000 · Grumav G21A · Reciprocating Engine Cylinder Section > (CAN) CONNECTING RODS FOR NR 8 AND NR 9 CYLINDERS BROKEN. - [SDR PNSA990704](https://openairdocs.org/sdr/PNSA990704.md): Cylinder · broken · Jul 31, 1999 · N7811 · Grumav G21A · Reciprocating Engine Cylinder Section > ENGINE BEGAN TO VIBRATE IN CRUISE AND SUBSEQUENTLY LOST OIL PRESSURE. SECURED ENGINE AND LANDED AIRCRAFT. ENGINE REPLACED DUE TO CASE DAMAGE FROM BROKEN CYLINDER HOLD DOWN STUDS. - [SDR PNSA990202](https://openairdocs.org/sdr/PNSA990202.md): Valve · out of position · Feb 23, 1999 · N741 · Grumav G21A · Aircraft Fuel Distribution System > DURING CLIMB, PILOT NOTICED FUEL WAS NOT BURNING EVENLY FROM BOTH TANKS. UPON SELECTING THE RT TANK (THE FULLEST TANK) BOTH ENGINES LOST POWER. THE FUEL SELECTOR WAS RETURNED TO THE BOTH POSITION AND THE ENGINES STARTED. AFTER LANDING IT WAS DISCOVERED THE - [SDR CA990223005](https://openairdocs.org/sdr/CA990223005.md): Bearing · cracked · Feb 16, 1999 · Grumav G21A · Propeller Blade Section > (CAN) ROUTINE INSPECTION AT OVERHAUL FOUND THE PROPELLER BLADE BEARING CRACKED AND THE BLADE CORRODED AROUND THE SHANK. THE BEARING WAS REPLACED AND THE PROP BLADE SHANK WAS REWORKED. - [SDR CA980908005](https://openairdocs.org/sdr/CA980908005.md): Crankcase · cracked · Aug 12, 1998 · Grumav G21A · Reciprocating Engine Power Section > (CAN) REMOVAL OF NR 5 CYLINDER, DUE TO LOW COMPRESSION, REVEALED A CIRCUMFERENTIAL CRACK IN THE FORWARD FACE OF THE FORWARD CRANKCASE HALF. NUMEROUS CRYSTALLINE STRUCTURED CHIPS WERE FOUND IN THE MAIN OIL SCREEN. THE AMOUNT OF MATERIAL WAS NOT UNUSUAL, BUT TH - [SDR 99ZZZX1872](https://openairdocs.org/sdr/99ZZZX1872.md): Torque Tube · failed · Aug 8, 1998 · N327 · Grumav G21A · Landing Gear Retraction/Extension System > THE TORQUE TUBE IS DESIGNED TO SHEER IF THE AIRPLANE IS RAISED BY THE GEAR LEGS IN SHALLOW WATER. ONCE THE GEAR IS DOWN, THERE IS VERY LITTLE FORCE ON THE TORQUE TUBE. THE TORQUE TUBE MAY HAVE BEEN CRACKED PREVIOUSLY. THE TORQUE TUBE SHEARED AT THE DESIGN S - [SDR PNSA980204](https://openairdocs.org/sdr/PNSA980204.md): Cylinder · separated · Feb 20, 1998 · N741 · Grumav G21A · Reciprocating Engine Cylinder Section > LT ENGINE STARTED RUNNING ROUGH AND LOST POWER, RETURNED TO BASE. FOUND CYLINDER SEPARATED FROM CASE. REPLACED ENGINE. - [SDR PNSA970203](https://openairdocs.org/sdr/PNSA970203.md): Float · damaged · Feb 19, 1997 · N22932 · Grumav G21A · Wheel/Ski/Float > DAMAGED RT FLOAT DURING TAXI UP BOAT RAMP. - [SDR CA960614005](https://openairdocs.org/sdr/CA960614005.md): Manifold Tab · broke · Jun 5, 1996 · Grumav G21A · Engine Collector/Tailpipe/Nozzle > (CAN) THE SINGLE TAB WHICH ATTACHES THE EXHAUST MANIFOLD TO THE EXHAUST COLLECTOR BROKE. THIS ALLOWED THE MANIFOLD TO ROTATE AND DIRECT ALL THE EXHAUST ON THE RIGHT HAND ENGINE ACCESSORY COWL. THIS DAMAGED THE REAR SECTION OF THE "HORSE COLLAR", RIGHT HAND GOV - [SDR 95ZZZX3461](https://openairdocs.org/sdr/95ZZZX3461.md): Bushing · worn · Jun 23, 1995 · N67DF · Grumav G21A · Landing Gear Retraction/Extension System > AFTER DEPRESSURIZATION OF THE RIGHT MLG SHOCK STRUT FOR SERVICE, EXCESSIVE FREEPLAY WAS NOTED AT THE UPPER AND LOWER DRAG LINK BUSHINGS. WITH THE STRUT PRESSURIZED, THIS CONDITION WAS IMPOSSIBLE TO DETECT. REPLACEMENT OF THE BUSHINGS WAS ALL THAT WAS REQUIRE - [SDR 95ZZZX3460](https://openairdocs.org/sdr/95ZZZX3460.md): Bushing · worn · Jun 23, 1995 · N67DF · Grumav G21A · Landing Gear Retraction/Extension System > AFTER DEPRESSURIZATION OF THE RIGHT MLG SHOCK STRUT FOR SERVICE, EXCESSIVE FREEPLAY WAS NOTED AT THE UPPER AND LOWER DRAG LINK BUSHINGS. WITH THE STRUT PRESSURIZED, THIS CONDITION WAS IMPOSSIBLE TO DETECT. REPLACEMENT OF THE BUSHINGS WAS ALL THAT WAS REQUIRE ## 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 aircraft_model_key = 'G21A' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/grumman-g-21a/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.