# Service difficulty reports: Boeing 747-446

A list on [Boeing 747-446](https://openairdocs.org/model/boeing-747-446.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 19 · 932 reports

- [SDR 9WGA2026101234402](https://openairdocs.org/sdr/9WGA2026101234402.md): Hmu · faulted · Oct 10, 2026 · N344KD · Boeing 747446 · Fuel Controlling System
  > LOG PAGE 251714, ITEM 1, ENGINE #4 LOST THRUST IN CRUISE N1, 32% FUEL FLOW 0.3 ALL ENGINE INDICATIONS WERE NORMAL IN DESCENT AT LOW ENGINE POWER EICAS ENGINE FAIL MSG SHOWED WITH OIL PRESS GETTING LOW PROPTING PRECAUTIONARY SHUTDOWN, AFTER ARRIVAL TO ANC, MAIN
- [SDR KCSA202610071224](https://openairdocs.org/sdr/KCSA202610071224.md): Power Supply · inoperative · Oct 7, 2026 · N742CK · Boeing 747446 · Emergency Lighting
  > L/H UPPER DECK SLIDE DOOR EMERGENCY LIGHT INOP
- [SDR KCSA202610071223](https://openairdocs.org/sdr/KCSA202610071223.md): Light · inoperative · Oct 7, 2026 · N742CK · Boeing 747446 · Emergency Lighting
  > CENTER AFT EMERGENCY LIGHT BY GALLEY IS INOP.
- [SDR KCSA2026082348](https://openairdocs.org/sdr/KCSA2026082348.md): Pcb · unserviceable · Aug 23, 2026 · N742CK · Boeing 747446 · Detection System
  > FIRE WARNING BELL AND MASTER WARNING DURING CLIMB OUT. NO FIRE LIGHTS OR EICAS. REMOVED AND REPLACED 1AD04 CARGO FIRE AFT DIODE CIRCUIT CARD ASSY IAW KA AMM 26-10-01. PERFORMED OPS TEST IAW KA B747-400 AMM 26-16-10. OPS TEST GOOD. NO DEFECTS NOTED.
- [SDR U2RA2026071400036](https://openairdocs.org/sdr/U2RA2026071400036.md): Indicator · no discrepancy · Jul 12, 2026 · N936CA · Boeing 747446 · Airspeed/Mach Indicator
  > AIRSPEED UNRELIABLE. PERFORM OPS TEST IAW AIRCRAFT MAINTENANCE MANUAL 34-12-00. NO FAULTS NOTED. AIRCRAFT EXPERIENCED AN EQUIPMENT COOLING FAILURE PRIOR TO THE AIRSPEED BECOMING UNRELIABLE.
- [SDR KCSA202607021099](https://openairdocs.org/sdr/KCSA202607021099.md): Floor Support · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK FLOOR SUPPORT LOWER CHORD AT STA 1220 RBL 98 IS CRACKED
- [SDR KCSA202607021098](https://openairdocs.org/sdr/KCSA202607021098.md): Power Supply · no test · Jul 2, 2026 · N742CK · Boeing 747446 · Emergency Lighting
  > EMERGENCY LIGHT OVER L1 FAILED LIGHT TEST
- [SDR KCSA202607021097](https://openairdocs.org/sdr/KCSA202607021097.md): Shear Web · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK FLOOR STATION 140-160 LBL 40 SHEAR WEB CRACKED MULTIPLE LOCATIONS
- [SDR KCSA202607021096](https://openairdocs.org/sdr/KCSA202607021096.md): Slide · unwanted deploy · Jul 2, 2026 · N742CK · Boeing 747446 · Escape Slide
  > DURING TROUBLESHOOTING OF ARM/ DISARM HANDLE OF L/H UPPER DECK DOOR, THE EMERGENCY ESCAPE SLIDE WAS UNINTENTIONALLY DEPLOYED AND REQUIRES REPLACEMENT
- [SDR KCSA202607021095](https://openairdocs.org/sdr/KCSA202607021095.md): Skin · corroded · Jul 2, 2026 · N742CK · Boeing 747446 · Fuel Storage
  > MAIN DECK CENTER FUEL TANK UPPER SKIN CORROSION STA 1050 LBL 80-100
- [SDR KCSA202607021094](https://openairdocs.org/sdr/KCSA202607021094.md): Skin · corroded · Jul 2, 2026 · N742CK · Boeing 747446 · Fuel Storage
  > EVIDENCE OF CORROSION FOUND ON CENTER TANK UPPER SKIN AT STA 1150 RBL 110
- [SDR KCSA202607021093](https://openairdocs.org/sdr/KCSA202607021093.md): Skin · corroded · Jul 2, 2026 · N742CK · Boeing 747446 · Fuel Storage
  > EVIDENCE OF CORROSION FOUND ON CENTER TANK UPPER FWD SKIN SECTION AT BS 1139, RBL 100.
- [SDR KCSA202607021092](https://openairdocs.org/sdr/KCSA202607021092.md): Skin · corroded · Jul 2, 2026 · N742CK · Boeing 747446 · Fuel Storage
  > EVIDENCE OF CORROSION FOUND ON CENTER TANK UPPER SKIN AT STA 1140 RBL 100
- [SDR KCSA202607021091](https://openairdocs.org/sdr/KCSA202607021091.md): Skin · corroded · Jul 2, 2026 · N742CK · Boeing 747446 · Fuel Storage
  > EVIDENCE OF CORROSION FOUND ON CENTER TANK UPPER SKIN FWD OF TENSION FITTING AT STA 1180 RBL 98
- [SDR KCSA202607021090](https://openairdocs.org/sdr/KCSA202607021090.md): Stiffener · damaged · Jul 2, 2026 · N742CK · Boeing 747446 · Wing Miscellaneous Structure
  > L/H WING T/E STIFFENER ON AFT SIDE OF AFT SPAR AT WBL 1150 DAMAGED.
- [SDR KCSA202607021089](https://openairdocs.org/sdr/KCSA202607021089.md): Frame · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Main, Frame
  > NOSE RADOME O/B RING ANGLE CRACKED AT APPROX 11 O'CLOCK POSITION
- [SDR KCSA202607021088](https://openairdocs.org/sdr/KCSA202607021088.md): Floor Support · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > FLIGHT DECK R/H UPPER SILL OUTER CHORD CRACKED AT STA 315 JUST ABOVE R2 WINDOW
- [SDR KCSA202607021087](https://openairdocs.org/sdr/KCSA202607021087.md): Shear Web · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK FLOOR BS 160-180 LBL 48, SHEAR WEB CRACKED.
- [SDR KCSA202607021086](https://openairdocs.org/sdr/KCSA202607021086.md): Shear Web · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK FLOOR STA 140-160 RBL 40, SHEAR WEB CRACKED MULTIPLE LOCATIONS
- [SDR KCSA202607021085](https://openairdocs.org/sdr/KCSA202607021085.md): Angle · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK AT STA 2360 LBL 33 JUST BELOW FLOOR LEVEL ANGLE SUPPORT CRACKED.
- [SDR KCSA202607021084](https://openairdocs.org/sdr/KCSA202607021084.md): Angle · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > MAIN DECK AT BS 2360, RBL 33 JUST BELOW FLOOR LEVEL ANGLE SUPPORT CRACKED.
- [SDR KCSA202607021083](https://openairdocs.org/sdr/KCSA202607021083.md): Depressor · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Main, Structure
  > RT UPPER DECK DOOR FWD UPPER CORNER SEAL DEPOESSOR CRACKED
- [SDR KCSA202607021082](https://openairdocs.org/sdr/KCSA202607021082.md): Floorbeam · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Main, Floor Beam
  > CRACK FOUND ON MAIN DECK FLOORBEAM CLIP AT STA 280 LBL 6.
- [SDR KCSA202607021081](https://openairdocs.org/sdr/KCSA202607021081.md): Depressor · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fixed Inner Doors
  > LEFT UPPER DECK DOOR AFT UPPER CORNER SEAL DEPRESSOR CRACKED
- [SDR KCSA202607021080](https://openairdocs.org/sdr/KCSA202607021080.md): Shear Tie · cracked · Jul 2, 2026 · N742CK · Boeing 747446 · Fuselage Internal Mounting Structure
  > CRACK FOUND IN BS 1000 FRONT SPAR SHEAR TIE AT RBL 33.99
- [SDR U2RA2026061900030](https://openairdocs.org/sdr/U2RA2026061900030.md): Slide · deployed · Jun 10, 2026 · N936CA · Boeing 747446 · Escape Slide
  > LEFT UPPER DECK DOOR SLIDE DID NOT FULLY DEPLOY WHEN INADVERTANTLY ACTIVATED. REPLACED DOOR SLIDE ASSEMBLY PER AIRCRAFT MAINTENANCE MANUAL 25-68-01.
- [SDR KCSA2026052229](https://openairdocs.org/sdr/KCSA2026052229.md): Switch · faulted · May 22, 2026 · N745CK · Boeing 747446 · Stabilizer Position Indicating
  > STAB TRIM 2, STAB TRIM 3, EMERGENCY DECLARED FOR STAB TRIM 2 & 3. REMOVED AND REPLACED CAPTAINS STAB MANUAL TRIM CTRL WHEEL SWITCH IAW AMM 27-41-11 AND WDM 27-41-11. OPS CHECKS GOOD. AUTOLAND UNIQUE GROUND TEST PASSED IAW AMM 22-10-00. THIS A/C REMAINS CAT I
- [SDR 9WGA2026052134401](https://openairdocs.org/sdr/9WGA2026052134401.md): Buss Protection · faulty · May 21, 2026 · N344KD · Boeing 747446 · AC Power Distribution System
  > AFTER TAKE-OFF FROM NRT, INDICATION, AC BUS 1 FAIL, RETURNED TO NRT, MAINTENANCE PERFORMED PER FIM 24-23 TASK 812, REMOVED AND REPLACED BCU, TESTED EPGS (GCU1) AND EPGS 2 (GCU2) GROUND TEST COMPLIED WITH, TEST PASSED.
- [SDR KCSA2026042123](https://openairdocs.org/sdr/KCSA2026042123.md): Battery Pack · discharged · Apr 21, 2026 · N744CK · Boeing 747446 · Emergency Exits
  > 100320914: RIGHT SIDE UPPER DECK DOOR EMERGENCY OPENING SYS BATTERY PACK DEAD A/T: ITEM TRANSFERRED TO DMI #100320914 CAT C DUE 5/1/26 M PROCEDURE COMPLIED WITH IAW B747 MEL 52-23-1-3A PLACARDS INSTALLED. REF DMI #100320914 RH UPPER DECK DOOR BATT PACK INOP.
- [SDR U2RA202603090001](https://openairdocs.org/sdr/U2RA202603090001.md): Hydraulic Line · cracked · Mar 4, 2026 · N756CA · Boeing 747446 · Hydraulic System, Main
  > APPROXIMATELY 30 MINUTES AFTER TOP OF CLIMB, CRUSING AT FLIGHT LEVEL 34,000, EICAS MESSAGE "HYD QTY LOW 1" QUANTITY OBSERVED DECREASING REPIDLY ON HYD SYNOPTIC PAGE. SHORTLY AFTER, QUANTITY AT 0.00. EICAS "HYD PRESS SYS 1". NON NORMAL CHECKLIST ACTIONED. - R
- [SDR U2RA2026022400031](https://openairdocs.org/sdr/U2RA2026022400031.md): Warning Message · false activation · Feb 19, 2026 · N729CA · Boeing 747446 · Fire Detection
  > DURING TAXI, EICAS MESSAGE FIRE APU - APU FIRE BOTTLE DISCHARGED. - UPON INSPECTION, NO EVIDENCE OF FIRE. APU PLACED ON A DEFERRED MAINTENANCE ITEM PER MINIMUM EQUIPMENT LIST 49-11-01-01.
- [SDR KCSA202604041028](https://openairdocs.org/sdr/KCSA202604041028.md): Battery Pack · no test · Feb 8, 2026 · N744CK · Boeing 747446 · Emergency Exits
  > RIGHT UPPER DECK ESCAPE DOOR BATTERY PACK FAIL PUSH TO TEST LIGHT DURING A/C START UP
- [SDR KCSA202512051228](https://openairdocs.org/sdr/KCSA202512051228.md): Battery Pack · weak · Dec 5, 2025 · N742CK · Boeing 747446 · Emergency Lighting
  > CENTER EMERGENCY LIGHTS ON UPPER DECK DO NOT STAY ILLUMINATED.
- [SDR KCSA2025102269](https://openairdocs.org/sdr/KCSA2025102269.md): Door · no discrepancy · Oct 22, 2025 · N745CK · Boeing 747446 · Fixed Inner Doors
  > DOOR U/D FLT LK. PERFORMED OPERATIONAL TEST IAW B747-400 AMM CHP 52-23-00. COULD NOT DUPLICATE SYS OPS CHECKS NORMAL.
- [SDR 9WGA2025102134401](https://openairdocs.org/sdr/9WGA2025102134401.md): Circuit Card · dirty · Oct 22, 2025 · N344KD · Boeing 747446 · Fire Detection
  > CONTINOUS MASTER WARNING FIRE MAIN DECK FWD INFLIGHT, TROUBLESHOT PER FIM 26-16, TASK 864, CLEAN CIRCUIT CARD PER AMM 26-10-01, FIRE SYSTEM TEST, AMM 26-11-00, PASS NO FAULTS.
- [SDR KCSA2025101956](https://openairdocs.org/sdr/KCSA2025101956.md): Lock · warning message · Oct 19, 2025 · N745CK · Boeing 747446 · Door Warning System
  > DOOR UPPER DECK FLIGHT LOCK MESSAGE. BOTH DOORS FLIGHT LOCK ACTUATORS OPERATIONAL CHECKS NORMAL IAW B747-400 AMM 52-23-00.
- [SDR KCSA2025101855](https://openairdocs.org/sdr/KCSA2025101855.md): Lock · faulted · Oct 18, 2025 · N745CK · Boeing 747446 · Fixed Inner Doors
  > DOOR UPPER DECK FLIGHT LOCK. PERFORMED BOTH SIDE FLIGHT LOCK ACTUATOR OPERATIONS CHECK. ALL WORKING GOOD AND BOTH SIDE SWITCH ARE WORKING GOOD. NO FAULT FOUND IAW B747-400 AMM 52-23-00
- [SDR KCSA2025101252](https://openairdocs.org/sdr/KCSA2025101252.md): Lock · inoperative · Oct 12, 2025 · N745CK · Boeing 747446 · Fixed Inner Doors
  > DOOR UPPER DECK FLIGHT LOCK. TROUBLESHOT PER FIM 52-71 TASK 823. PERFORMED OPERATIONS TEST IAW AMM 52-23-00. ALL CHECKS GOOD AT THIS TIME.
- [SDR U2RA2025110300024](https://openairdocs.org/sdr/U2RA2025110300024.md): Skin · damaged · Oct 9, 2025 · N729CA · Boeing 747446 · Fuselage Main, Plate/Skin
  > AIRCRAFT SUSTAINED GROUND DAMAGE TO THE LOWER FUSELAGE SKIN, FORWARD OF THE FORWARD LOWER CARGO DOOR, STA 539.125, BETWEEN STRINGERS S-33R AND S-34R, MEASURING 3.875" LONG AND STA 574.750 BETWEEN STRINGERS S-33R AND S-34R MEASURING 4.875" LONG - ACCOMPLISHED C
- [SDR KCSA20251003950](https://openairdocs.org/sdr/KCSA20251003950.md): Actuator · failed · Sep 29, 2025 · N745CK · Boeing 747446 · Landing Gear Actuator
  > 100272867: RIGHT WING GEAR FAILED TO EXTEND WITH ALTERNATE GEAR EXTENSION, DECLARED EMERGENCY. REMOVED AND REPLACED WING GEAR ALTERNATE ELECTRIC ACTUATOR. OPERATIONAL CHECK GOOD. NO DEFECTS NOTED. NO FURTHER ACTION REQUIRED AT THIS TIME (JACKED AIRCRAFT PERF
- [SDR KCSA2025100192950](https://openairdocs.org/sdr/KCSA2025100192950.md): Landing Gear · no deploy · Sep 29, 2025 · N745CK · Boeing 747446 · Landing Gear Retraction/Extension System
  > RIGHT WING GEAR FAILED TO EXTEND WITH ALTERNATE GEAR EXTENSION, DECLARED EMERGENCY.
- [SDR KCSA2025092549](https://openairdocs.org/sdr/KCSA2025092549.md): Actuator · unserviceable · Sep 25, 2025 · N742CK · Boeing 747446 · Door Warning System
  > DOOR UPPER DECK FLIGHT LOCK CAUTION MESSAGE. TRANSFERRED TO DMI LIST NUMBER 100272910 IAW KA B747-400 MEL 52-23-3-2. CAT C. DUE 10-5-25. PLACARDS INSTALLED.: REFERENCE DMI 100272910. REMOVED AND REPLACED RIGHT HAND UPPER DECK DOOR LOCK ACTUATOR IAW KA B7
- [SDR KCSA2025092548](https://openairdocs.org/sdr/KCSA2025092548.md): Warning Light · false activation · Sep 25, 2025 · N742CK · Boeing 747446 · Door Warning System
  > DOOR UPPER DECK FLIGHT LOCK CAUTION MESSAGE. PERFORMED FLIGHT LOCK ACTUATOR OPS TEST IAW AMM 52-23-00. OPS TESTED GOOD. NO DEFECTS NOTED.
- [SDR KCSA2025092547](https://openairdocs.org/sdr/KCSA2025092547.md): Warning Message · false activation · Sep 25, 2025 · N742CK · Boeing 747446 · Door Warning System
  > DOOR UPPER DECK FLIGHT LOCK CAUTION MESSAGE. PERFORMED FLIGHT LOCK ACTUATOR OPERATIONAL TEST IAW AMM 52-23-00. OPERATIONAL TEST GOOD. NO DEFECTS NOTED.
- [SDR KCSA202509171161](https://openairdocs.org/sdr/KCSA202509171161.md): Stiffener · cracked · Sep 17, 2025 · N742CK · Boeing 747446 · Wing Main, Frame Structure
  > AILERON CAVITY I/B STRUCTURE 20 IN. FWD OF HINGE POINT VERTICAL STIFFENER CRACKED AT LOWER EDGE
- [SDR KCSA202509161160](https://openairdocs.org/sdr/KCSA202509161160.md): Bulkhead · cracked · Sep 16, 2025 · N745CK · Boeing 747446 · Fuselage Main, Bulkhead
  > 1 FASTENER HOLE NOTED ON LOWER R/H STA 2598 BULKHEAD AFT INNER CHORD HAS CRACK INDICATION
- [SDR KCSA202509161159](https://openairdocs.org/sdr/KCSA202509161159.md): Beam · corroded · Sep 16, 2025 · N745CK · Boeing 747446 · Wing Main, Frame Structure
  > LH WING TE FIXED TRAILING EDGE BEAM UPPER CHORD @ APPROX WBL 340 CORRODED
- [SDR KCSA202509161158](https://openairdocs.org/sdr/KCSA202509161158.md): Tension Tie · cracked · Sep 16, 2025 · N745CK · Boeing 747446 · Fuselage Main, Structure
  > FOUND CRACK INDICATION IN FRAME AT TENSION TIE STA 1140 L/H
- [SDR KCSA202509131157](https://openairdocs.org/sdr/KCSA202509131157.md): Reveal · cracked · Sep 13, 2025 · N745CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > FOUND DOOR REVEAL TO BE CRACKED AS MARKED AT R2 DOOR BETWEEN STR 25 AND 24
- [SDR KCSA202509121156](https://openairdocs.org/sdr/KCSA202509121156.md): Reveal · cracked · Sep 12, 2025 · N745CK · Boeing 747446 · Fuselage Miscellaneous Structure
  > CRACK FOUND IN L-5 DOOR REVEAL AT PRESS TO RELEASE LEVER NEAR STA 2231

Next page: https://openairdocs.org/model/boeing-747-446/reports.md?page=2

## 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 = '747446'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/boeing-747-446/reports

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