# Service difficulty reports: N439GT A list on [N439GT](https://openairdocs.org/aircraft/N439GT.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR UIEA2026091800883](https://openairdocs.org/sdr/UIEA2026091800883.md): Oil Filter · false indication · Sep 17, 2026 · N439GT · Boeing 747409F · Turbine Engine Oil System > EICAS MESSAGE ENG 3 OIL FILTER DISPLAYED RAN QRH AND COMPLETED QRH SHUTDOWN ENG 3. PERFORMED FIM TASK 71-00 & TASK A07 PER BLOCK 41. AFTER ENG RUN NO DEBRIS WAS FOUND; CONTINUED IN SERVICE. PERFORMED FIM TASK 79-00 FAULT TREE FIG 103. MSG CLEARED AND NO BLOCK - [SDR UIEA2026070900585](https://openairdocs.org/sdr/UIEA2026070900585.md): Tire · burst · Jul 9, 2026 · N439GT · Boeing 747409F · Tire > ADVISE TIRE DEBRIS LEFT IN PVG. PLANNED ANC LANDING STOP ON RUNWAY. CITY OPS ADVISED 2 TIRES MISSING. PER AMM 32-45-01 & IPC 32-45-03-02. C/W BLOWN TIRES INSPECTION PER AMM 05-51-25-202-009. R & R NR 5, 6, 7, & 8 TORQUE LIMITER PER AMM 32-42-20 REV 116 & IPC - [SDR UIEA2026042700249](https://openairdocs.org/sdr/UIEA2026042700249.md): Motor · failed · Apr 27, 2026 · N439GT · Boeing 747409F · Electrical Power System > TRONG FUMES IN FLIGHT DECK. APPLIED FIM 21-00-10 T/S, FOUND M/D PDU 6 RT ELECTRICAL MOTOR STUCK INOP. PDU 6 RH DEACTIVATED. R & R NR 6R PDU IAW AMM 25-53-01-004-001-004. OPS CHKD OK. - [SDR UIEA2026021300049](https://openairdocs.org/sdr/UIEA2026021300049.md): Sequence Valve · faulted · Feb 13, 2026 · N439GT · Boeing 747409F · Landing Gear Retraction/Extension System > GEAR WOULD NOT STAY UP WITH THE LANDING GEAR HANDLE IN THE UP POSITION MOVED HANDLE TO THE OFF POSITION WHILE INDICATING UP AND THE GEAR REMAINED UP INSTEAD OF DROPPING. R & R NOSE GEAR SEQUENCE VALVE IAW AMM 32-34-07-004-001, 32-34-07-404-006 & IPC 32-34-07- - [SDR UIEA2026021500052](https://openairdocs.org/sdr/UIEA2026021500052.md): Sequence Valve · faulted · Feb 13, 2026 · N439GT · Boeing 747409F · Landing Gear Retraction/Extension System > GEAR WOULD NOT STAY UP WITH THE LANDING GEAR HANDLE IN THE UP POSITION. MOVED HANDLE TO THE OFF POSITION WHILE INDICATING UP, AND GEAR REMAINED UP INSTEAD OF DROPPING. R & R NOSE GEAR SEQUENCE VALVE IAW AMM 32-34-07-004-001, 32-34-07-404-006 & IPC 32-34-07-02 - [SDR UIEA2026013000021](https://openairdocs.org/sdr/UIEA2026013000021.md): Trunnion · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage, Landing Gear Attach Fittings > LEFT BODY GEAR INBOARD TRUNNION, AIRCRAFT SIDE HAS CORROSION. BLENDED AREA ON LT BODY GEAR INBD TRUNNION. PERFORMED NDT AND DVI INSP. NO DEFECTS NOTED. ACCOMPLISHED FLAP PEEN, APPLIED TREATMENT, PRIMER & TOPCOAT IAW SRM 53-40-90-2R-1, REP 1, PAGE 7. COMPLYE - [SDR UIEA2026013000022](https://openairdocs.org/sdr/UIEA2026013000022.md): Trunnion · gouged · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage, Landing Gear Attach Fittings > GOUGE ON LT NLG TRUNNION BEARING CAP FWD AND AFT I/B CORNER. REPAIRED DAMAGE ON LT NLG TRUNNION BEARING CAP FWD AND AFT INBD CORNERS. IAW BOEING MESSAGE EA C-TLS-26-0002-10B. PERMANENT REPAIR WITH NO ADDITIONAL SUPPLEMENTAL INSPECTIONS. NO FURTHER DEFECTS NOT - [SDR UIEA2026013000023](https://openairdocs.org/sdr/UIEA2026013000023.md): Trunnion · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage, Landing Gear Attach Fittings > CORROSION ON OTBD EDGE OF LT BODY GEAR TRUNNION CAP. BLENDED AREA ON OTBD EDGE OF LT BODY GEAR TRUNNION INBD CAP. PERFORMED NDT AND DVI INSP. NO DEFECTS NOTED. ACCOMPLISHED FLAP PEEN, APPLIED TREATMENT, PRIMER AND TOPCOAT PER 747 SRM 53-40-90-2R-1 REP 1 PG 7 - [SDR UIEA2026013000024](https://openairdocs.org/sdr/UIEA2026013000024.md): Junction Box · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage Structure (General) > JUNCTION BOX COVER FOR RIGHT HAND BODY GEAR HAS CORROSION ON LOWER EDGE.(

REPAIRED AREA OF CORROSION ON RH BODY GEAR LOWER EDGE OF JUNCTION BOX PER SRM 51-70-13-2R-1 REPAIR 1. NO FURTHER DEFECTS NOTED

) - [SDR UIEA2026013000025](https://openairdocs.org/sdr/UIEA2026013000025.md): Junction Box · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage Structure (General) > JUNCTION BOX COVER J15, FOR LT BODY GEAR HAS CORROSION ON LOWER EDGE. REPAIRED CORROSION OF THE J15 JUNCTION BOX OF THE LT BODY GEAR IAW SRM 51-70-13-2R-1. NO FURTHER DFECTS NOTED. - [SDR UIEA2026013000026](https://openairdocs.org/sdr/UIEA2026013000026.md): Trunnion · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage, Landing Gear Attach Fittings > CORROSION ON LT NLG TRUNNION BEARING CAP INBD SIDE. BLENDED OUT CORROSION ON THE LT NLG TRUNNION BEARING CAP INBD SIDE FACE AREA, WITHIN LIMITS. TREATED AREA PROTECTIVE FINISH ON BLENDED AREA IAW SRM 53-10-90-2R-1, REPAIR 1, FIG 201, DETAIL II. NO FURTHER DEF - [SDR UIEA2026013000027](https://openairdocs.org/sdr/UIEA2026013000027.md): Trunnion · corroded · Feb 5, 2026 · N439GT · Boeing 747409F · Fuselage, Landing Gear Attach Fittings > CORROSION ON RT NLG TRUNNION BEARING CAP INBD SIDE. BLENDED OUT CORROSION ON THE RT NLG TRUNNION BEARING CAP INBD SIDE IAW SRM 51-10-90-2R-1, FIG 201. NO FURTHER DEFECTS NOTED. - [SDR UIEA2025121301342](https://openairdocs.org/sdr/UIEA2025121301342.md): Pca · faulted · Dec 13, 2025 · N439GT · Boeing 747409F · Hydraulic System, Main > HYD PRESS ENG 1. FOLLOWED FIM 29-11 TASK 803, NO CMS MESSAGE FOUND. R & R HYDIM 1 PCA PER AMM 29-11-42-004-001 & IPC 29-11-42-01B. OPS CHKD GOOD.. PFMD ENG 1 IDLE RUN IAW 71-00-00, OPS CHECK GOOD. NO 30 DAY HISTORY. - [SDR UIEA2025071900978](https://openairdocs.org/sdr/UIEA2025071900978.md): Engine · damaged · Jul 19, 2025 · N439GT · Boeing 747409F · Engine (Turbine/Turboprop) > ENG #3 SEVERE DAMAGE. NO OIL QUANTITY. REMOVED AND REPLACED #3 ENGINE IAW AMM 71-00-02-004-001-J00. PERFORMED ENGINE TEST RUN IAW AMM 71-00-00-700-801-J00 TEST #3. ALL OPS SATISFACTORY AND NO LEAKS OBSERVED. REF W/O 149634. - [SDR UIEA2025030400205](https://openairdocs.org/sdr/UIEA2025030400205.md): Slide · out of tolerance · Mar 10, 2025 · N439GT · Boeing 747409F · Escape Slide > UPPER DECK COMP- REQUIRE TO REPLACE THE UPP DECK DOOR SLIDE RAFT PACK DUE TO SLIDE RAFT PACK BULKY & TOP COVER CANNOT OPEN OR CLOSE SMOOTHLY(

R/R UPPER DECK DOOR SLIDE RAFT PACK IAW AMM 25-68-02 REV 112. NO FURTHER DEFECTS NOTED.

) - [SDR UIEA2025030500206](https://openairdocs.org/sdr/UIEA2025030500206.md): Floor Support · damaged · Mar 10, 2025 · N439GT · Boeing 747409F · Fuselage Miscellaneous Structure > MAIN DECK COMPT - AFTER OPEN UP CTR TANK FLOOR PANEL AT STA 1200 - STA 1220 MOST O/B FLOOR SUPPORT FOUND HOLE ELONGATED. FLOOR SUPPORT REPAIRED AS PER EN #1010-25 REV.0. NO FURTHER DEFECTS NOTED. - [SDR UIEA2025030500207](https://openairdocs.org/sdr/UIEA2025030500207.md): Rib · cracked · Mar 10, 2025 · N439GT · Boeing 747409F · Horizontal Stabilizer Miscellaneous Structure > RT HORIZONTAL STAB CLOSURE RIB LWR CHORD FOUND CRACKED. LWR CHORD REPAIRED AS PER SRM 55-10-09 REPAIR 13 REV.103. NO FURTHER DEFECTS NOTED. - [SDR UIEA2025030500208](https://openairdocs.org/sdr/UIEA2025030500208.md): Rib · cracked · Mar 10, 2025 · N439GT · Boeing 747409F · Horizontal Stabilizer Miscellaneous Structure > RH HORIZONTAL STAB CLOSURE RIB WEB FOUND CRACKED NEAR LWR CHORD AREA. WEB REPAIRED AS PER SRM 55-10-09 REPAIR 13 REV.103. NO FURTHER DEFECTS NOTED. - [SDR UIEA2025030600209](https://openairdocs.org/sdr/UIEA2025030600209.md): Stiffener · cracked · Mar 10, 2025 · N439GT · Boeing 747409F · Fuselage Main, Structure > DURNG HFEC INSPECTION AT BETWEEN RH STA 320 - 300, WL 130 NOSE WHEEL WELL STIFFENER PER SB 747-53A2465 FOUND CRACK APPROX 1.7" AS MARKED.(

STIFFENER REMOVED AND REPLACED AS PER SRM 51-40-02 REV.103 & SB 747-53A2465. NO FURTHER DEFECTS NOTED.

) - [SDR UIEA2025030600210](https://openairdocs.org/sdr/UIEA2025030600210.md): Bulkhead · cracked · Mar 10, 2025 · N439GT · Boeing 747409F · Fuselage Main, Bulkhead > DURING OPEN HOLE HFEC INSP AT BS 2598 BULKHEAD LH FWD INNER CHORD FOUND 5TH HOLE FROM BOTTOM WITH CRACK INDICATION APPROX 7 O'CLOCK POS LOOK O/B AS MARKED.(

REPAIRED AS PER EN #1012-25 REV.0. NO FURTHER DEFECTS NOTED.

) - [SDR UIEA2025030600211](https://openairdocs.org/sdr/UIEA2025030600211.md): Skin · damaged · Mar 10, 2025 · N439GT · Boeing 747409F · Ailerons > RH INBD AILERON OTBD EDGE PREVIOUS DAMAGE NOTED. TAP TEST PER SRM 51-10-06-06-0G-2 WITHIN SRM LIMIT 51-70-02-17-0. RE-INSP AT A CHECK AND PERM REPAIR AT C-CHECK.(

REPAIRED RH INBD AILERON OTBD EDGE AS PER B747-400F SRM 51-70-17 REV.103. NO FURTHER DEFECTS NO - [SDR UIEA2025030600212](https://openairdocs.org/sdr/UIEA2025030600212.md): Flap · damaged · Mar 10, 2025 · N439GT · Boeing 747409F · Trailing Edge Flaps > TRANSFER FROM ADD PAGE 2 OF 11, MDDR 224933 - RH WING VARIABLE CAMBER FLAP PERM REPAIR DUE WITHIN 25FC IAW EA-1957A200.(

RH WING VAIABLE CAMBER FLAP PERM REPAIRED AS PER B747-400F SRM 51-70-17 PARA 5B REV.103 & EA 1957A200 PART 3. DMI 224933 CLOSED.

/ MAIN DECK COMPT - SIDE CARGO DOOR INNER LOWER STRAP AT FWD & AFT EDGE FOUND CORROSION.(

JOB ACCOMPLISHED AS PER EN #1011-25 REV.0 NO FURTHER DEFECTS NOTED. PN 65B17878-1

) - [SDR UIEA2024081900838](https://openairdocs.org/sdr/UIEA2024081900838.md): Pdu · failed · Aug 19, 2024 · N439GT · Boeing 747409F · Leading Edge Slat Control System > 2 HR IN CRUISE FLIGHT, LEFT MID SPAN L/E FLAP INDICATED DEPLOYED, "FLAP PRIMARY" MASTER CAUTION. AFTER 5 MIN, FLAPS PRIMARY MASTER CAUTION, FLAP DRIVE CAUTION ANNUNCIATED, COULD NOT RETRACT IN FLIGHT, "LE MULTI DRIVE" STS MSG(

R/R L2 L/E SLAT PDU PER AMM - [SDR UIEA2024080300786](https://openairdocs.org/sdr/UIEA2024080300786.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MN DECK FLOOR PANELS JUST FORWARD OF SIDE CARGO DOOR LH HAS MULTIPLE CRACKS AND PUNCTURES.(

REFERENCE COBALT WO C1017 FOR SIGN OFFS. FAA FOR 8130-3 105870 FOR REPAIR OF MAIN DECK FLOOR PANEL JUST FWD OF SIDE CARGO DOOR LH SIDE. NO FURTHER DEFECTS NOTED PER S - [SDR UIEA2024080300785](https://openairdocs.org/sdr/UIEA2024080300785.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MN DK FLOOR PANEL LH SIDE AFT OF SIDE CARGO DOOR HAS MULTIPLE PUNCTURES AND CRACKS.(

REFERENCE COBALT WO C1016 AND C1018 FOR PROPER SIGN OFF. FAA FORM 8130-3 105871 FOR REPAIR OF MAIN DECK PANELS LH SIDE AFT OF SIDE CARGO DOOR. NO FURTHER DEFECTS NOTED PER S - [SDR UIEA2024080300784](https://openairdocs.org/sdr/UIEA2024080300784.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MN DK FLOOR PANEL LH SIDE AFT OF SIDE CARGO DOOR HAS MULTIPLE PUNCTURES AND CRACKS.(

REFERENCE COBALT WO'S C1016 AND C1018 FOR PROPER SIGN OFFS. FAA FOR 8130-3 105868 FOR REPAIR OF MAIN DECK PANEL LH SIDE AFT OF SIDE CARGO DOOR. NO FURTHER DEFECTS PER SRM 53 - [SDR UIEA2024080300783](https://openairdocs.org/sdr/UIEA2024080300783.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MAIN DECK CAROG FLOOR PANEL 144U5825-54 AT STA 1200 HAS THREE FASTENER HOLES DAMAGED.(

REFERENCE COBALT WO C1022 FOR SIGN-OFFS. FAA FORM 8130-3 106133 FOR REPAIR OF MAIN DECK CARGO FLOOR PANEL HAS THREE FASTENER HOLES DAMAGED. NO FURTHER DEFECTS NOTED PER SR - [SDR UIEA2024080300782](https://openairdocs.org/sdr/UIEA2024080300782.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MAIN DECK CARGO FLOOR PANEL 144U5825-64 AT STA 1200 HAS ONE FASTENER HOLE DAMAGED.(

REFERENCE COBALT WO C1021 FOR PROPER SIGN OFF. FAA FOR 8130-3 #106126 FOR REPAIR OF MAIN DECK CARGO FLOOR PANEL HAS FASTENER HOLE DAMAGED. NO FURTHER DEFECTS NOTED PER SRM 53 - [SDR UIEA2024080300781](https://openairdocs.org/sdr/UIEA2024080300781.md): Floor Panel · damaged · Aug 6, 2024 · N439GT · Boeing 747409F · Fuselage Floor Panel > MAIN DECK CARGO FLOOR PANEL 144U5803-32 AT STA 1200 HAS ONE FASTENER HOLE DAMAGED.(

REFERENCE COBAL WO C1023 FOR PROPER SIGN OFF. FAA FORM 8130-3 106134 FOR REPAIR OF MAIN DECK CARGO FLOOR PANEL HAS ONE FASTENER HOLE DAMAGED. NO FURTHER DEFECTS NOTED PER SRM - [SDR UIEA2024122301181](https://openairdocs.org/sdr/UIEA2024122301181.md): Oil Filter · warning message · Dec 23, 2023 · N439GT · Boeing 747409F · Turbine Engine Oil System > ON TAKEOFF ROLL "ENG 4 OIL FILT" EICAS. LOW SPEED 40 KIAS ABORT.(

REPLACED ENG OIL FILTER PER AMM 79-28-08 T/S PER FIM 79-00 FIG 103 NO DEFECTS FOUND. AIRCRAFT OK FOR SERVICE.

) ## 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 = 'N439GT' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N439GT/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.