# Service difficulty reports: Boeing 747-446F

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

Newest first. General aviation reporting is voluntary.

- [SDR U2RA2026081100048](https://openairdocs.org/sdr/U2RA2026081100048.md): Skin · dented · Jul 15, 2026 · N537CA · Boeing 747446F · Trailing Edge Flaps
  > DURING C-CHECK AT HANGAR, LT WING V/C FLAP NR 1E FOLDING NOSE SKIN WAS FOUND WITH DENT. PERMANENT REPAIR ACCOMPLISHED IAW SRM 57-43-02, REPAIR 2.
- [SDR 9WGA2026062435601](https://openairdocs.org/sdr/9WGA2026062435601.md): Unknown · unknown · Jun 24, 2026 · N356KD · Boeing 747446F · Central Warning
  > ENGINE 2 SHUTDOWN EICAS, CONTINUOUS CLICKING BEHIND FIRE HANDLE PANEL, LESS THAN 68% NO CLICKING, AFTER LANDING CLICKING CONTINUED, OIL PRESS SNS 2, ENG 2 FUEL SHUTOFF VALVE.
- [SDR U2RA2026071400035](https://openairdocs.org/sdr/U2RA2026071400035.md): Battery Pack · inoperative · Jun 23, 2026 · N537CA · Boeing 747446F · Emergency Lighting
  > BATTERY PACK DID NOT PASS CAPACITY TEST.
- [SDR U2RA202508060021](https://openairdocs.org/sdr/U2RA202508060021.md): Power Supply · no test · Aug 6, 2025 · N936CA · Boeing 747446F · Emergency Lighting
  > DURING HEAVY CHECK C AT KSAT FOUND ON UPPER DECK RH DOOR EMERGENCY TEST FAIL (EMERGENCY S W 51541),LOW BATTERY VOLTAGE.
- [SDR U2RA2024012400002](https://openairdocs.org/sdr/U2RA2024012400002.md): Panel · missing · Jan 24, 2024 · N537CA · Boeing 747446F · Horizontal Stabilizer, Plate/Skin
  > HORIZONTAL STABILIZER FIXED PANEL MISSING UPON LANDING. FABRICATED AND INSTALLED TEMPORARY PANEL PER FLIGHT VEHICLES CONSULTING ENGINEERING ORDER 24013-1 REVISION IR DATED 01/23/2024. DATA APPROVED ON FAA FORM 8110-3 DATED 01/24/2024 BY R. MANASHI DERT 87627
- [SDR U2RA2023111100047](https://openairdocs.org/sdr/U2RA2023111100047.md): Unknown · unknown · Oct 31, 2023 · N537CA · Boeing 747446F · Fuselage Main, Plate/Skin
  > DURING ACCOMPLISHMENT OF BOEING SB 747-53-2721 AT A-CHECK AT HANGAR 901 EDFH, FOUND CHAFING DAMAGE TO SKIN STA 2557.5 - 2598 STR 1-3. ACCOMPLISHED REPAIR IAW SB 747-53-2721 PART 4 AND BOEING MESSAGE NUMBER MUA-MUA-23-0153-07B.
- [SDR 9WGA2023090235601](https://openairdocs.org/sdr/9WGA2023090235601.md): Hmu · inoperative · Sep 2, 2023 · N356KD · Boeing 747446F · Engine Fuel and Control
  > DISCREPANCY: ENGINE #2 FAILURE ON SHORT FINAL. CORRECTIVE ACTION: REMOVED AND REPLACED HMU IAW B747 AMM 73-21-14. #2 ENGINE RUN SUCCESSFUL. NO LEAKS NOTED.
- [SDR 9WGA2023082234401](https://openairdocs.org/sdr/9WGA2023082234401.md): Unknown · unknown · Aug 22, 2023 · N344KD · Boeing 747446F · Hydraulic Power System
  > DISCREPANCY: AIR TURN BACK DUE TO LOSS OF #4 HYDRAULIC FLUID. 50% REDUCTION IN 2 HOURS OF FLIGHT. CORRECTIVE ACTION: UPON ARRIVAL AT GATE ALL FOUR HYD SYSTEMS WERE IN THE GREEN BAND. PERFORMED LEAK CK ON #4 EDP AS PER AMM 29-11-08, NO LEAKS NOTED.
- [SDR 9WGA2023081935601](https://openairdocs.org/sdr/9WGA2023081935601.md): Unknown · unknown · Aug 19, 2023 · N356KD · Boeing 747446F · Engine Temperature Indicating System
  > DISCREPANCY: DURING HIGH-SPEED PORTION OF TAKEOFF ROLL, ENGINE 1 OVERTEMP. DURING CLIMB ENGINE 2 OVERTEMP. CORRECTIVE ACTION: PERFORMED ENGINE OVERTEMP INSPECTION OF ENGINE 1 & 2 IAW 72-00-00. NO DEFECTS NOTED, ENGINE OK FOR SERVICE.
- [SDR 9WGA2023042935601](https://openairdocs.org/sdr/9WGA2023042935601.md): Unknown · unknown · Apr 29, 2023 · Boeing 747446F · Landing Gear Retraction/Extension System
  > DISCREPANCY: GEAR DISAGREE DURING RETRACTION, NOSE GEAR. CORRECTIVE ACTION: FOUND GEAR PIN INSTALLED ON NLG WITH STREAMER "REMOVE BEFORE FLIGHT" MISSING. REMOVED GEAR PIN IAW B747 AMM 32-00-15.
- [SDR 9WGA2022020235601](https://openairdocs.org/sdr/9WGA2022020235601.md): Bracket · broken · Feb 2, 2022 · N356KD · Boeing 747446F · Engine (Turbine/Turboprop)
  > AIR RETURN BACK TO LAX DUE TO ENGINE 4 SURGE. ENGINE 4 SURGED MULTIPLE TIMES DURING CRUISE, SURGE WAS INTERMITTENT. PERFORMED SURGE CHECKLIST. REMOVED AND REPLACED VSV ACTUATOR LEVER PIVOT BRACKET & BOLT/STUD AS PER AMM 72-36-00. OPS CHECK GOOD.
- [SDR 9WGA2021111534401](https://openairdocs.org/sdr/9WGA2021111534401.md): Warning Message · illuminated · Nov 15, 2021 · N344KD · Boeing 747446F · Fire Detection
  > IN CRUISE FLIGHT, EICAS MSG "FIRE MN DK AFT" APPEARED NUMEROUS TIMES WITH FIRE BELL & WARNING.
- [SDR 9WGA2021110934401](https://openairdocs.org/sdr/9WGA2021110934401.md): None · none · Nov 9, 2021 · N344KD · Boeing 747446F · Fire Detection
  > ATB, MAIN DECK CARGO FIRE WARNING.
- [SDR 9WGA2021013134401](https://openairdocs.org/sdr/9WGA2021013134401.md): Flap System · fault message · Jan 31, 2021 · N344KD · Boeing 747446F · Leading Edge Slat Position Indicating System
  > AFTER TAKEOFF WHEN RETRACTING FLAPS FROM 20 TO 10 WE GOT AN EICAS MSG, FLAPS PRIMARY FOLLOWED BY FLAPS DRIVE.
- [SDR 9WGA2020121234401](https://openairdocs.org/sdr/9WGA2020121234401.md): Compressor · stalled · Dec 12, 2020 · N344KD · Boeing 747446F · Engine (Turbine/Turboprop)
  > ENGINE NR 1 HIGH EGT, COMPRESSOR STALL, VIBRATION. RAN ENGINE LIMIT SURGE/STALL CHECKLIST. SHUTDOWN ENGINE AND RETURNED TO SHV.
- [SDR 9WGA2020051534401](https://openairdocs.org/sdr/9WGA2020051534401.md): Warning System · activated · May 14, 2020 · N344KD · Boeing 747446F · Trailing Flap Position Indicating System
  > EICAS ALERT - FLAPS DRIVE
- [SDR MK1Y201904210002](https://openairdocs.org/sdr/MK1Y201904210002.md): Tension Tie · mislocated · Mar 7, 2019 · N356KD · Boeing 747446F · Fuselage Main, Structure
  > TENSION TIES FRAME STA 1160&1200 BETWEEN L/RBL48-L/RBL70 STA 1200-THE DWG REQUIRES 47 FASTENERS HOLES DIA 1/4" ON EACH SIDE BUT 55 HOLES WERE DRILLED. STA 1160-THE DWG REQUIRES 53 FASTENERS HOLES DIA 1/4" ON EACH SIDE BUT 59 HOLES WERE DRILLED
- [SDR 9WGA20181129801](https://openairdocs.org/sdr/9WGA20181129801.md): Clamp · detached · Nov 28, 2018 · N344KD · Boeing 747446F · Pneumatic Distribution System
  > EICAS MESSAGE AT TOP OF CLIMB "BLD DUCT LEAK (2)". RETURNED TO KORD FOR REPAIRS. FOUND CLAMP BLOWN OFF LEADING EDGE DUCT ON LEFT HAND SIDE.
- [SDR KCSA11089](https://openairdocs.org/sdr/KCSA11089.md): Slide · defective · Dec 13, 2011 · N744CK · Boeing 747446F · Escape Slide
  > MAINTENANCE WORKING CREW UPPER DECK DOOR WARNING LIGHT INADVERTENTLY DEPLOYED LT UPPER DECK SLIDE. SLIDE PARTIALLY DEPLOYED. REMOVED AND REPLACED UPPER DECK SLIDE IAW B747-400 MM 25-68-01.

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

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