# Service difficulty reports: Boeing 747-312

A list on [Boeing 747-312](https://openairdocs.org/model/boeing-747-312.md).

Newest first. General aviation reporting is voluntary.

- [SDR AU990701](https://openairdocs.org/sdr/AU990701.md): Pump · faulty · Jul 16, 1999 · Boeing 747312 · Engine Fuel Pump
  > (AUS) NR 4 ENGINE MAIN FUEL PUMP SUSPECT FAULTY.
- [SDR AU990685](https://openairdocs.org/sdr/AU990685.md): Stringer · corroded · Apr 14, 1999 · Boeing 747312 · Fuselage Main, Longeron/Stringer
  > (AUS) STRINGER 47R CORRODED IN AREA BETWEEN BS 1630 AND BS 1650. LENGTH OF CORROSION 254 MM (10 INCHES) - WIDTH OF CORROSION 52.8 MM (2 INCHES) - DEPTH OF CORROSION 1.524 MM (0.060 INCH).
- [SDR AU990386](https://openairdocs.org/sdr/AU990386.md): Engine · seized · Apr 14, 1999 · Boeing 747312 · Engine (Turbine/Turboprop)
  > (AUS) NR 1 ENGINE SEIZED. LIMITED INFORMATION PROVIDED.
- [SDR AU990514](https://openairdocs.org/sdr/AU990514.md): Track · fractured · Apr 10, 1999 · Boeing 747312 · Trailing Edge Flaps
  > (AUS) RT INBOARD FORE FLAP CENTER BANANA FITTING BROKEN AND PROTRUDING THROUGH FLAP. SUSPECT CAUSED BY FRACTURE OF THE CENTER PROGRAMMING TRACK.
- [SDR AU990369](https://openairdocs.org/sdr/AU990369.md): Flap Track · fractured · Apr 10, 1999 · Boeing 747312 · Trailing Edge Flaps
  > (AUS) RIGHT INBOARD FORE FLAP TRACK CENTER BANANNA FITTING BROKEN AND PROTRUDING THROUGH THE FORE FLAP. FOLLOWING LOWERING OF THE FLAPS, THE CAUSE OF DAMAGE WAS FOUND TO BE FAILURE OF THE CENTER PROGRAMMING TRACK ASSEMBLY WHICH HAD FRACTURED INTO SEVERAL SECT
- [SDR AU990561](https://openairdocs.org/sdr/AU990561.md): Wire · faulty · Apr 9, 1999 · Boeing 747312 · Fuel System Wiring
  > (AUS) NR 2 MAIN AFT BOOST PUMP WIRING INSULATION FAULTY.
- [SDR AU990145](https://openairdocs.org/sdr/AU990145.md): Card · faulty · Feb 8, 1999 · Boeing 747312 · Fire Detection
  > (AUS) APU FIRE DETECTOR CARD FAULTY.
- [SDR AU981701](https://openairdocs.org/sdr/AU981701.md): Skin · damaged · Dec 24, 1998 · Boeing 747312 · Fuselage Main, Plate/Skin
  > (AUS) FUSELAGE CONTACTED BY CARGO LOADING MACHINERY ADJACENT TO THE FORWARD CARGO DOOR, CAUSING THE FOLLOWING DAMAGE: 1.2 INCH HOLES IN SKIN AT STA 520 - STA 540, EITHER SIDE OF STRINGER S40R. 2. SKIN AND STRINGERS FROM STA 500 - STA 520 ABOVE STRINGER S38R
- [SDR AU981533](https://openairdocs.org/sdr/AU981533.md): Frame · cracked · Sep 11, 1998 · Boeing 747312 · Fuselage Main, Frame
  > (AUS) LEFT SIDE INNER CHORD LOCATED AT BULKHEAD STA 2598 CONTAINED TWO CRACKS IN THE FOLLOWING LOCATIONS: 1. CRACK RUNNING FROM EDGE OF FASTENER - CRACK LENGTH 6.35 MM (0.25 INCH). 2. CRACK RUNNING FROM THE EDGE THROUGH THE INBOARD FASTENER HOLE AND STOPP
- [SDR AU981475](https://openairdocs.org/sdr/AU981475.md): Frame · cracked · Sep 2, 1998 · Boeing 747312 · Fuselage Main, Frame
  > (AUS) FUSELAGE FRAME WEB LOCATED AT BS 1265 LT AND RT SIDES CRACKED IN THE FOLLOWING AREAS: 1. LT SIDE AT 12 O'CLOCK POSITION. 2. RT SIDE AT 3 O'CLOCK POSITION. FOUND DURING INSPECTION IAW SB 747-53A2416.
- [SDR AU981454](https://openairdocs.org/sdr/AU981454.md): Frame · cracked · Aug 27, 1998 · Boeing 747312 · Fuselage Main, Frame
  > (AUS) RIGHT SIDE FUSELAGE FRAME WEB LOCATED AT STA 1265 CRACKED. FOUND DURING INSPECTION IAW SB 747-53A2416.
- [SDR AU980800](https://openairdocs.org/sdr/AU980800.md): Web · cracked · Jun 9, 1998 · Boeing 747312 · Fuselage Main, Frame
  > (AUS) FUSELAGE FRAME WEB LOCATED AT BS 1265 WL 200 LT AND RT SIDES CRACKED. FOUND DURING HF EDDY CURRENT INSPECTION IAW SB 747-53A2416.
- [SDR AU980729](https://openairdocs.org/sdr/AU980729.md): Skin · cracked · Jun 8, 1998 · Boeing 747312 · Fuselage Main, Plate/Skin
  > (AUS) FUSELAGE LAP SPLICE CRACKED ON THE LEFT SIDE BETWEEN BS 340 AND BS400 ADJACENT TO STRINGER 6L. CRA CK LENGTH 0.508 MM (0.020 INCHES). FOUND DURING HIGH FREQUENCY EDDY CURRENT INSPECTION.
- [SDR AU980921](https://openairdocs.org/sdr/AU980921.md): Duct · ruptured · May 29, 1998 · Boeing 747312 · Air Distribution System
  > (AUS) NR 1 AIR CYCLE MACHINE INLET DUCT RUPTURED AT THE `Y' SECTION.
- [SDR AU980798](https://openairdocs.org/sdr/AU980798.md): Switch · faulty · May 11, 1998 · Boeing 747312 · Trailing Edge Flap Control System
  > (AUS) INBOARD TRAILING EDGE FLAP ALTERNATE FLAP CONTROL MODULE ARMING SWITCH FAULTY.
- [SDR AU980797](https://openairdocs.org/sdr/AU980797.md): Drum · broken · May 11, 1998 · Boeing 747312 · Trailing Edge Flap Control System
  > (AUS) RIGHT INBOARD FLAP TRANSMITTER CABLE DRUM FLANGE BROKEN.
- [SDR AU980461](https://openairdocs.org/sdr/AU980461.md): Controller · misrigged · Apr 2, 1998 · Boeing 747312 · Leading Edge Slat Control System
  > (AUS) DURING AFTER-FLIGHT INSPECTION, THE NR 15 KRUEGER FLAP WAS FOUND SEVERELY DAMAGED WITH SURFACE AND STRUCTURE TORN APART. THE LEADING EDGE FLAP TORQUE TUBE BETWEEN THE OFFSET GEARBOX AND THE NO 15 FLAP OUTBOARD ROTARY ACTUATOR WAS FOUND TO HAVE THE OUTBO
- [SDR AU980457](https://openairdocs.org/sdr/AU980457.md): Gearbox · jammed · Feb 24, 1998 · Boeing 747312 · Engine Thrust Reverser
  > (AUS) AFTER LANDING, THE NR 2 ENGINE THRUST REVERSER FAILED TO STOW. GROUND INVESTIGATION FOUND THE THRUST REVERSER'S NR 3 GEARBOX JAMMED AND DAMAGED.
- [SDR AU980682](https://openairdocs.org/sdr/AU980682.md): Pump · failed · Jan 11, 1998 · Boeing 747312 · Fuel Boost Pump
  > (AUS) NR 3 MAIN FORWARD BOOST PUMP FAILED. INVESTIGATION FOUND THE CAUSE OF THE FAILURE TO BE INSULATION FAILURE DUE TO CONDUCTIVE CORROSION AT THE WIRE TERMINAL ASSEMBLY. PART TC: 65,844.
- [SDR AU980681](https://openairdocs.org/sdr/AU980681.md): Pump · failed · Jan 11, 1998 · Boeing 747312 · Fuel Boost Pump
  > (AUS) NR 2 MAIN OUTBOARD OVERBOARD/JETTISON BOOST PUMP FAILED. INVESTIGATION FOUND THAT THE FAULT WAS DUE TO CONDUCTIVE CORROSION AT THE WIRE TERMINAL ASSEMBLY. PART TC: 64,376.
- [SDR AU971631](https://openairdocs.org/sdr/AU971631.md): Pushrod · wrong part · Dec 30, 1997 · Boeing 747312 · Trailing Edge Flap Control System
  > (AUS) RT INBOARD TRAILING EDGE NR 5 AFT FLAP PUSHROD INCORRECT PART. PUSHROD WAS ALSO 20.637MM (0.8125 INCH) TOO SHORT. GENEVA CAMS NR 5 AND NR 6 ALSO TRANSPOSED.
- [SDR AU971601](https://openairdocs.org/sdr/AU971601.md): Blade · failed · Nov 22, 1997 · Boeing 747312 · Turbine Section
  > (AUS) NO1 ENGINE FIRST STAGE TURBINE BLADE FAILED. APPROXIMATELY 50%OF THE BLADE WAS MISSING. SUSPECT STAGE ONE BLADES SUBJECTED TO HIGHER THAN NORMAL TEMPERATURES.
- [SDR AU971427](https://openairdocs.org/sdr/AU971427.md): Engine · failed · Nov 12, 1997 · Boeing 747312 · Engine (Turbine/Turboprop)
  > (AUS) NO1 ENGINE LOST POWER AND EXCEEDED EGT LIMITS.
- [SDR AU971464](https://openairdocs.org/sdr/AU971464.md): Heater · stripped · Nov 3, 1997 · Boeing 747312 · Fuel Heater
  > (AUS) NO1 ENGINE P.H.I. FUEL HEATER ASSEMBLY FUEL OUT UNION PN MS9193-07 LOOSE. FURTHER INVESTIGATION FOUND THAT THE THREAD INSIDE THE HEATER ASSEMBLY WAS STRIPPED.
- [SDR AU970748](https://openairdocs.org/sdr/AU970748.md): Stringer · corroded · May 28, 1997 · Boeing 747312 · Fuselage Main, Longeron/Stringer
  > (AUS) STRINGERS 51L AND 51R LOCATED IN AFT CARGO COMPARTMENT FUSELAGE BILGE AREA (SECTION 46) CONTAINED EXFOLIATION CORROSION IN AREAS FROM BS 1820 TO BS 1840:- STRINGER 51L - EXFOLIATION CORROSION IN VERTICAL FLANGE OF TOP HAT SECTION OF EXTRUDED STRINGER STR
- [SDR AU970749](https://openairdocs.org/sdr/AU970749.md): Chord · corroded · May 27, 1997 · Boeing 747312 · Fuselage Miscellaneous Structure
  > (AUS) NOSE WHEEL WELL STRUCTURE LOWER CHORD AT BS 400 BADLY CORRODED FROM STRINGER 42L TO STRINGER 42R
- [SDR AU970747](https://openairdocs.org/sdr/AU970747.md): Beam · corroded · May 27, 1997 · Boeing 747312 · Fuselage Main, Floor Beam
  > (AUS) UPPER DECK FLOOR BEAM STRUCTURE AT BS 980 CONTAINED CORROSION IN AREA OF CART LIFT CUTOUT ON THE AFT FACE OF THE UPPER CHORD BETWEEN RBL 20 AND RBL 30 - CORROSION WAS CLASSIFIED AS LEVEL 2 AND LEVEL 3 - FOUND DURING INSPECTION IAW BOEING ALERT SB 747-53A
- [SDR AU970580](https://openairdocs.org/sdr/AU970580.md): Oil System · low quantity · May 24, 1997 · Boeing 747312 · Turbine Engine Oil System
  > (AUS) NO3 ENGINE LOST ALL OIL - SUSPECT CAUSED BY TEMPORARY FAULT WITH NO3 CARBON SEAL
- [SDR AU970746](https://openairdocs.org/sdr/AU970746.md): Cable Guard · cracked · May 16, 1997 · Boeing 747312 · Flight Control System
  > (AUS) NUMEROUS CABLE GUARD ASSEMBLIES IN MAIN CABIN CABLE VERTICAL RUNS CRACKED AND EMBRITTLED - CABLE OPERATING SYSTEMS INCLUDED AILERON, WING FLAP, NOSEWHEEL STEERING AND LANDING GEAR BRAKES -IN ADDITION VERTICAL CABLE GUARDS IN FORWARD CARGO COMPARTMENTFOR
- [SDR AU970745](https://openairdocs.org/sdr/AU970745.md): Fastener · loose · May 16, 1997 · Boeing 747312 · Nacelle/Pylon, Frame/Spar/Rib
  > (AUS) NO1 AND NO4 PYLON AFT DIAGONAL BRACE FORWARD MOUNT FITTINGS HAD LOOSE HILOCK FASTENERS.
- [SDR AU970744](https://openairdocs.org/sdr/AU970744.md): Strap · cracked · Apr 30, 1997 · Boeing 747312 · Fuselage Main, Bulkhead
  > (AUS) FUSELAGE BULKHEAD SPLICE STRAP LOCATED AT BS1241 CRACKED ON LHAND RH SIDES AT FORWARD AND AFT HOLES
- [SDR AU970760](https://openairdocs.org/sdr/AU970760.md): Wire · failed · Apr 24, 1997 · Boeing 747312 · Fuel System Wiring
  > (AUS) NO2 FUEL BOOST PUMP ELECTRICAL WIRING INSULATION FAILED DUE TO CONDUCTIVE CORROSION AT THE WIRE TERMINAL ASSEMBLY
- [SDR AU970496](https://openairdocs.org/sdr/AU970496.md): Fitting · damaged · Apr 24, 1997 · Boeing 747312 · Horizontal Stabilizer, Attach Fittings
  > (AUS) LH HORIZONTAL STABILISER HINGE FITTING GOUGED ON INBOARD SURFACE- INVESTIGATION FOUND THAT THE HINGE BEARING RETAINER HAD ROTATED THROUGH APPROXIMATELY 90 DEGREES CAUSING THE DAMAGE - THE GOUGE WAS APPROXIMATELY 2.54MM (0.100IN) DEEP BY 12.7MM (0.5IN) WI
- [SDR AU970426](https://openairdocs.org/sdr/AU970426.md): Blade · failed · Mar 19, 1997 · Boeing 747312 · Turbine Section
  > (AUS) NO3 ENGINE FIRST STAGE TURBINE BLADE BROKEN AT MID SPAN. INVESTIGATION FOUND 30% OF BLADES HAD BULLSEYE EROSION ON THE CONCAVE SIDE. FOUND DURING BOROSCOPE INSPECTION.
- [SDR AU970425](https://openairdocs.org/sdr/AU970425.md): Skin · debonded · Mar 18, 1997 · Boeing 747312 · Fuselage Main, Plate/Skin
  > (AUS) SECTION 41 RHS SKIN PANELS DEBONDING IN TWO AREAS.
- [SDR AU970424](https://openairdocs.org/sdr/AU970424.md): Diffuser · cracked · Mar 17, 1997 · Boeing 747312 · Turbine Engine Compressor Section
  > (AUS) NO1 ENGINE NO6 MOUNTING BOSS LOCATED ON THE DIFFUSER CASE CRACKED ON RH SIDE. CRACK LENGTH 4.762MM (0.1875IN). FOUND DURING EDDY CURRENT INSPECTION.
- [SDR AU970132](https://openairdocs.org/sdr/AU970132.md): Csd · failed · Jan 21, 1997 · Boeing 747312 · Alternator-Generator Drive
  > (AUS) NO1 ENGINE CONSTANT SPEED DRIVE (CSD) FAULTY - CSD FAILED TO DISCONNECT - EVIDENCE OF OVERHEATING - STRIP REPORT INDICATES OUTPUT SPUR GEAR ACCESSORY GEAR FAILURE
- [SDR AU970423](https://openairdocs.org/sdr/AU970423.md): Window · cracked · Jan 20, 1997 · Boeing 747312 · Flight Compartment Windows
  > (AUS) COCKPIT WINDOW R3 LOCATED BEHIND FIRST OFFICER DELAMINATED AND THEN CRACKED
- [SDR AU970134](https://openairdocs.org/sdr/AU970134.md): Oxygen System · depleted · Jan 1, 1997 · Boeing 747312 · Crew Oxygen System
  > (AUS) FLIGHT CREW OXYGEN SYSTEM PRESSURE DEPLETED. SUSPECT CREW REGULATOR LEFT IN `100% ON' POSITION
- [SDR AU961100](https://openairdocs.org/sdr/AU961100.md): Control Cable · frayed · Jul 23, 1996 · Boeing 747312 · Aileron Control System
  > (AUS) AILERON CABLE AB13 LOCATED IN AREA OF LH REAR SPAR HAD SIX OF SEVEN STRAND BROKEN AT CABLE DRUM AT WS 776.98 - CABLE AA11 ALSO DAMAGED WITH NUMEROUS BROKEN STRANDS - SUSPECT CAUSED BY INCORRECT INSTALLATION AND ALIGNMENT WITH BOTH CABLES BEING IN THE SA
- [SDR AU960448](https://openairdocs.org/sdr/AU960448.md): Bolt · worn · Mar 20, 1996 · Boeing 747312 · Engine Mount Section
  > (AUS) NO2 ENGINE UPPER AFT MOUNT FITTING BOLTS AND BUSHES WORN - APPROXIMATE AMOUNT OF VERTICAL MOVEMENT WAS 0.060IN DURING INVESTIGATION THE FOLLOWING OTHER PROBLEMS WERE FOUND: 1. BOTH AFT FITTING ATTACHMENT BOLTS PNO 65B90383-2 WERE EXCESSIVELY WORN AND ST
- [SDR AU960383](https://openairdocs.org/sdr/AU960383.md): Mount · worn · Mar 8, 1996 · Boeing 747312 · Engine Mount Section
  > (AUS) NO4 ENGINE FORWARD ENGINE MOUNT ASSEMBLY PNO 65B90363-3 AND AFT ENGINE MOUNT ASSEMBLY PNO 65B90363-2 ATTACHMENT LUG BUSHES WORN -WEAR ALSO TO AFT MOUNT ATTACHMENT BOLTS
- [SDR AU960071](https://openairdocs.org/sdr/AU960071.md): Fcu · faulty · Jan 2, 1996 · Boeing 747312 · Fuel Control/Turbine Engines
  > (AUS) NO4 ENGINE FUEL CONTROL UNIT SUSPECT FAULTY DUE TO INTERNAL LINKAGE WEAR
- [SDR 96ZZZX8](https://openairdocs.org/sdr/96ZZZX8.md): Tire · failed · Feb 7, 1995 · N116KB · Boeing 747312 · Tire
  > ON LANDING ROLL, VIBRATION FELT SIMILAR TO NOSE WHEEL SHIMMY. AFTER ENGINE SHUT DOWN, GROUND ENGINEER REPORTED NR 11 TIRE BURST WITH DAMAGE TO ACFT BELLY AREA ABOVE TIRE. APPROACH AND LANDING WERE NORMAL APART FROM VIBRATION OF REVERSERS AND MINIMUM AUTO BRA

## 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 = '747312'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/boeing-747-312/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.