# Boeing 747-4KZF

- Type: Aircraft model (FAA registry)
- Registry code: 138488F
- Manufacturer (registry): BOEING
- Model: 747-4KZF
- Aircraft type: Fixed wing multi engine
- Category: Airplane
- Engines: 4 · Turbo-fan
- Seats: 8
- Weight class: 20,000 lb and over
- Certification: Type certificated
- Registered aircraft: 2
- Page: https://openairdocs.org/model/boeing-747-4kzf

Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker.

## ADs that may apply (OpenAirDocs)

Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

None matched.

## Registered aircraft (2)

- [N407KZ](https://openairdocs.org/aircraft/N407KZ): [Wilmington Trust Co Trustee](https://openairdocs.org/faa-owner/WILMINGTON%20TRUST%20CO%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2008, S/N 36134
- [N508KZ](https://openairdocs.org/aircraft/N508KZ): [Wilmington Trust Company Trustee](https://openairdocs.org/faa-owner/WILMINGTON%20TRUST%20COMPANY%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 2008, S/N 36135

## NTSB investigations

None matched to aircraft with this model.

## FAA accident and incident reports

None matched to aircraft with this model.

## Service difficulty reports (154, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR UIEA2026100200939](https://openairdocs.org/sdr/UIEA2026100200939), Oct 2, 2026: ELECTRONIC UNIT. FAULTED. GEAR LEVER WOULDN'T COME UP AFTER DEPARTURE(<P>REMOVED AND REPLACED PROX SWITCH ELECTRONICS UNIT PER AMM 32-09-03/501. PERFORMED GROUND TEST OF PSEU SYSTEM PER 
- [SDR UIEA2026081400761](https://openairdocs.org/sdr/UIEA2026081400761), Aug 13, 2026: ACTUATOR. FAULTED. EICAS MSG GEAR TILT WHEN AIRBORNE AND ATTEMPTED TO RETRACT THE LANDING GEAR AFTER TAKE-OFF. T/S AND FOUND LT BLG TRUCK ALT DEFECTIVE & HYD LEAK FROM HOSE. R & R
- [SDR UIEA2026071300603](https://openairdocs.org/sdr/UIEA2026071300603), Jul 19, 2026: BEARING. EXCESS PLAY. LH WING #3 FLAP TRACK FWD FITTING BEARING FOUND PLAY(<P>WORK ACCOMPLISHED AS PER EN #3506-26 REV O. NO FURTHER DEFECTS NOTED</P> / <!--STARTFRAGMENT--><!--ENDFR
- [SDR UIEA2026071300604](https://openairdocs.org/sdr/UIEA2026071300604), Jul 19, 2026: BEARING. EXCESS PLAY. RH WING #6 FLAP TRACK FWD FITTING BEARING FOUND PLAY(<P>WORK ACCOMPLISHED AS PER EN #3506-26 REV O. NO FURTHER DEFECTS NOTED</P> / <!--STARTFRAGMENT--><!--ENDFR
- [SDR UIEA2026030200073](https://openairdocs.org/sdr/UIEA2026030200073), Apr 10, 2026: SEAT TRACK. GOUGED. GOUGE AT LOADING SYS LOCKING HOLE ON THE CENTER OF SEAT TRACK RBL 11 STATION 1935 ON CABIN FLOOR. REMOVED DAMAGE PER 747 SRM 51-10-02 PAGE 6. FOUND DAMAGE OUT O
- [SDR UIEA2026030200074](https://openairdocs.org/sdr/UIEA2026030200074), Apr 10, 2026: CHANNEL. CRACKED. CRACK FOUND ON LT OF TENSION TIE FWD CHANNEL AT FS 720. REPAIRED LT TENSION TIE AT BS 720 PER SRM 53-20-30-R2-2 REPAIR 2. NO FURTHER DEFECTS NOTED.
- [SDR UIEA2026030200075](https://openairdocs.org/sdr/UIEA2026030200075), Apr 10, 2026: NOSE COWL. CORRODED. SURFACE CORROSION ON NOSE COWL LIP OF NR 3 ENG. REMOVED CORROSION ON NOSE COWL LIP OF NR 3 ENG PER SRM 51-00-06-0 REV 105 & SRM 54-11-01-1A-ADL DETAIL III FIG 1
- [SDR UIEA2026031100083](https://openairdocs.org/sdr/UIEA2026031100083), Apr 10, 2026: SEAT TRACK. GOUGED. GOUGE AT THE LOADING SYSTEM LOCKING HOLE ON THE CENTER OF SEAT TRACK AT LBL 11 STA 1935 ON CABIN FLOOR(<P>REPAIRED THE LOADING SYSTEM LOCKING HOLE ON THE CENTER
- [SDR UIEA2026031100084](https://openairdocs.org/sdr/UIEA2026031100084), Apr 10, 2026: SKIN. DENTED. EXTERNAL SKIN ON RIGHT SIDE STA 1934 BETWEEN STR 32R AND 33R HAS A DENT. DENT ON EXTERNAL SKIN AT STA 1934 BETWEEN STR 32R AND 33R IS IN A USE AS IS CONDITION P
- [SDR UIEA2026031600094](https://openairdocs.org/sdr/UIEA2026031600094), Apr 10, 2026: TENSION TIE. CRACKED. CRACK FOUND ON RH SIDE OF TENSION TIE FWD CHANNEL AT FS 720 & CRACK FOUND AT 1 EACH FASTENER HOLE AT RH SIDE OF TENSION TIE AT FS 720. ACCOMPLISHED ONE CHANNEL 
- [SDR UIEA2026031600095](https://openairdocs.org/sdr/UIEA2026031600095), Apr 10, 2026: SEAT TRACK. GOUGED. GOUGE AT THE LOADING SYS LOCKING HOLE ON THE CENTER OF SEAT TRACK AT LBL 11 AT STATION 1612 ON CABIN FLOOR. REPAIRED SEAT TRACK SECTION FROM STATION 1620 TO STA
- [SDR UIEA2026032300106](https://openairdocs.org/sdr/UIEA2026032300106), Apr 10, 2026: SEAT TRACK. GOUGED. GOUGE AT THE LOADING SYS LOCKING HOLE ON THE CENTER OF SEAT TRACK AT LBL 11 STATION 1290 MAIN CABIN. REPAIRED SEAT TRACK PER SRM 53-00-52-1A-1 &AMP; BOEING MSG 
- [SDR UIEA2026040700146](https://openairdocs.org/sdr/UIEA2026040700146), Apr 10, 2026: WEDGE. PUNCTURED. PUNCTURE ON LH INBD ELEVATOR TRAILING EDGE WEDGE. PERFORMED PERM REPAIR PER SRM 51-70-07. NO FURTHER DEFECTS NOTED.
- [SDR UIEA2026022500068](https://openairdocs.org/sdr/UIEA2026022500068), Feb 28, 2026: DUCT. DAMAGED. R/H W/W PACK #3 DUCT ASSEMBLY DAMAGE. IT WAS FOUND HANGING IN THE R/H WING GEAR WHEEL WELL. IT HAD SEPARATED/FAILED AT THE CONTROL VALVE AT THE TOP OF THE WHEEL
- [SDR UIEA2025121101339](https://openairdocs.org/sdr/UIEA2025121101339), Dec 11, 2025: FLEX LINE. CRACKED. AFTER ROTATION, RECEIVED GEAR TILT EICAS MSG. GEAR SYNOPTIC PAGE SHOWED LEFT BODY GEAR TILT MSG. FOUND LT BODY GEAR POSITIONING ACTUATOR HYD LINE CRACKED. REPLA
- [SDR UIEA2025081201121](https://openairdocs.org/sdr/UIEA2025081201121), Aug 12, 2025: DRIVE UNIT. FAILED. WINDSHEAR SYS EICAS MSG. PRESENT LEG FAULT SHOW MSG 3405 WXR ANTENNA FAIL. REPLACED WEATHER RADAR DRIVE UNIT. CARRY OUT WXR LT & RT SYSTEM AND OPS TEST, TEST GO
- [SDR UIEA2025062700816](https://openairdocs.org/sdr/UIEA2025062700816), Jun 27, 2025: COOLING FAN. FAILED. ELECTRICAL BURNING SMELL, SMOKE IN COCKPIT ON INITIAL CLIMB. EQUIP COOLING EICAS FOLLOWED, THEN EICAS SCREEN BLANKED AFTER APPROX 60 SEC. PERFORMED AMM 05-51-56
- [SDR UIEA2025062500814](https://openairdocs.org/sdr/UIEA2025062500814), Jun 25, 2025: MODULE. FAULTED. CREW DECLARED EMERGENCY INTO ANC. BODY GEAR STEERING EICAS CAUTION MSG (INFLIGHT) &AMP; BODY GEAR STEERING SYS STS MSG.(<P>FOUND MMSG 32041, REPLACED LT BGS HYD
- [SDR UIEA2025043000573](https://openairdocs.org/sdr/UIEA2025043000573), Apr 30, 2025: TIRE. FAILED. TIRE #9 BLEW ON TAKE OFF.(<P>R/R #9 TIRE AND #10 TIRE/WHEEL ASSY. ALSO, PERFORMED CHAPTER 5 CONDITIONAL INSP 05-51-34-202-001. NO FURTHER DEFECTS NOTED.</P>)
- [SDR UIEA2025042500571](https://openairdocs.org/sdr/UIEA2025042500571), Apr 22, 2025: WINDSHIELD. CRACKED. LEFT FRONT WINDSHIELD HAS INNER PANE CRACK.(<P>REMOVED AND REPLACED L1 WINDSHIELD ASSY PER AMM 56-11-01/401 AND AIPC 56-11-01-02A ITEM 25. REMOVED AND REPLACED 
- [SDR UIEA2024122601185](https://openairdocs.org/sdr/UIEA2024122601185), Dec 26, 2024: VALVE. FAULTED. BLEED 2 EICAS MESSAGE.(<P>R/R ENG 2 PRV IAW AMM 36-11-19. OPS CHK GOOD ON RUN-UP PER AMM 71-00-00. DMI 223140 CLOSED</P>)
- [SDR UIEA2024111401089](https://openairdocs.org/sdr/UIEA2024111401089), Nov 14, 2024: LINE. DAMAGED. GEAR TILT EICAS MESSAGE ON TAKEOFF. LEFT BODY GEAR.(<P >FOUND HYDRAULIC LINE DAMAGED IN LH WHEEL WELL BODY FROM BODY GEAR TILT ACTUATOR HYD FUSE. RMVD FLEX LINE
- [SDR UIEA2024110501080](https://openairdocs.org/sdr/UIEA2024110501080), Nov 5, 2024: ENGINE. POWER LOSS. EGT ROLLBACK #4 ENGINE SHORTLY AFTER TAKE-OFF. AIRCRAFT DIVERTED TO ICN.(<P>R/R #4 ENG C/W ENG RUN UP &AMP; LEAK CHECK NORMAL PER AMM 71-00-00, 71-00-02 &AMP; T
- [SDR UIEA2024093000963](https://openairdocs.org/sdr/UIEA2024093000963), Sep 30, 2024: ACTUATOR. WARNING MESSAGE. SPEED BRAKE ARMED MEMO MSG AT 50KTS, CONFIG SPOILER MASTER WARNING AT 60KTS. RTO(<P>ITEM TRANFERED TO MDDR 217813 PER MEL 27-62-01 CAT C DUE DATE 10OCT24. LP 18
- [SDR UIEA2024092900962](https://openairdocs.org/sdr/UIEA2024092900962), Sep 29, 2024: CIRCUIT CARD. FAULTED. STARTER CUTOUT ENG 4 MSG IN FLIGHT(<P>INSPECTED ENGINE STARTER FOR CONDITION AND SERVICING &AMP; STARTER VALVE FOR CONDITION. REPLACED N2 SPEED CARD IAW AMM 73-
- [SDR UIEA2024073100763](https://openairdocs.org/sdr/UIEA2024073100763), Aug 6, 2024: FAIRING. DELAMINATED. LHW I/B FORE FLAP L/E FAIRING FOUND DELAMINATION(<P>PERFORMED PERMANENT REPAIR AS PER SRM 51-70-07 PAR 5A. NO FURTHER DEFECTS NOTED.</P>)
- [SDR UIEA2024073100762](https://openairdocs.org/sdr/UIEA2024073100762), Aug 6, 2024: FAIRING. DELAMINATED. RHW O/B FORE FLAP MID L/E FAIRING FOUND DELAMINATION(<P>PERFORMED PERMANENT REPAIR AS PER SRM 51-70-07 PAR 5A. NO FURTHER DEFECTS NOTED.</P>)
- [SDR UIEA2024073100761](https://openairdocs.org/sdr/UIEA2024073100761), Aug 6, 2024: FAIRING. DELAMINATED. RHW I/B FORE FLAP MID L/E FAIRING FOUND DELAMINATION. PERFORMED PERMANENT REPAIR AS PER SRM 51-70-07 PAR 5A. NO FURTHER DEFECTS NOTED.
- [SDR UIEA2024072600755](https://openairdocs.org/sdr/UIEA2024072600755), Aug 6, 2024: SHEAR TIE. CRACKED. STA 1000 FRONT SPAR SHEAR TIE LBL 57.50 FOUND CRACK(<P>SHEAR TIE REPLACED AS PER ATLAS AIR EO 4453C024 REV.4 PART 5 STEP 2 CONDITION 8 AND RI-53-12-17026 REV.A.
- [SDR UIEA2024072600754](https://openairdocs.org/sdr/UIEA2024072600754), Aug 6, 2024: FAIRING. CRACKED. #4 ENG NOSE COWL LIP FAIRING AT INNER SIDE 12 O`CLOCK EXTERIOR SURFACE FOUND CRACK(<P>LIP SKIN CRACK AREA REPAIRED AS PER SRM 54-15-01-2R-20 REPAIR 20 FIG 201. 
- [SDR UIEA2024072600752](https://openairdocs.org/sdr/UIEA2024072600752), Aug 6, 2024: FITTING. CRACKED. STA 1000 INTERCOSTAL LUG FITTING LBL 11.33 FOUND CRACK(<P>INTERCOSTAL LUG FITTING REPLACED AS PER ATLAS AIR EO 4453C024 REV 4 PART 3 STEP 3 CONDITION 6. NO FURT
- [SDR UIEA2024072300730](https://openairdocs.org/sdr/UIEA2024072300730), Aug 6, 2024: TENSION TIE. CRACKED. RH BS 740 UPPER DECK TENSION TIE (4EA) FASTENER HOLES FOUND CRACK AT AFT CHANNEL. TENSION TIE REPAIRED AS PER SRM 53-20-30-2R-1 REPAIR 1 FIG 201 (CAT B) STEEL P
- [SDR UIEA2024072300729](https://openairdocs.org/sdr/UIEA2024072300729), Aug 6, 2024: TENSION TIE. CRACKED. RH BS 740 UPPER DECK TENSION TIE 1EA FASTENER HOLE FOUND CRACK AT FRAME. FRAME 1EA CRACK FASTENER HOLE REPAIRED AS PER ATLAS AIR EO 4453A301 REV.12 PART 2 STEP 
- [SDR UIEA2024080200778](https://openairdocs.org/sdr/UIEA2024080200778), Aug 6, 2024: BATTERY. DISCHARGED. U/D STA 390 WL 380 RBL14 EMER LTS POWER PACK M5168 CAPACITY LOW FOUND DURING DEEP CYCLE TEST. EMER LTS PWR PACK M5168 BATT ASSY REPLACED &AMP; TESTED NORMAL AS 
- [SDR UIEA2024080200777](https://openairdocs.org/sdr/UIEA2024080200777), Aug 2, 2024: FMC. FAULTED. REJECTED TAKE OFF @ 70 KNOTTS AUTOTHROTTLE DISCONNECT MASTER CAUTION.(<P>R/R LH FMC IAW AMM 34-61-01. OPS CHECK GOOD. DMI 214021 CLOSED.</P>)
- [SDR UIEA2024070500584](https://openairdocs.org/sdr/UIEA2024070500584), Jul 6, 2024: TRU. FAULTED. "DC 2 DIST" CIRCUIT BREAKER POPPED IN FLIGHT ALONG WITH MULTIPLE EICAS MESSAGE FAULTS.(<P>REMOVED AND REPLACED "DC 2 DIST" CIRCUIT BEAKER AND DC BUS #2 TRU. PER
- [SDR UIEA2024062400566](https://openairdocs.org/sdr/UIEA2024062400566), Jun 24, 2024: ENGINE. WARNING MESSAGE. #3 ENGINE OIL FILTER ADVISORY MESSAGE(<P>REF TO M3, R/R #3 ENG IAW ATLAS REQUEST IAW AMM 71-00-02.</P> / <P>LP 1847107 M3: R/R #3 ENG PER ATLAS REQUEST. LEAKS C
- [SDR UIEA2024061600524](https://openairdocs.org/sdr/UIEA2024061600524), Jun 16, 2024: TIRE. FAILED. TIRE FAILURE ON TAKE OFF. LOSS OF HYD 1 SYS. HYD QTY LOW 1 & HYD PRESS SYS 1 AFTER LEVEL OFF FL290. ON LANDING, HYD SYS 2 & 4 FAIL HYD QTY ON 2 & 4 WENT TO ZERO
- [SDR UIEA2024050800342](https://openairdocs.org/sdr/UIEA2024050800342), May 7, 2024: SKIN. CORRODED. BULGE - SKIN, LWR FACE OF LH WING T/E INBD FORE FLAP LWR SKIN WBL 395 - WBL 407, FRONT SPAR(<P>1) PERFORM PERMANENT REPAIR OH LH WING T/E INBD FORE FLAP LWR SKI
- [SDR UIEA2024050800343](https://openairdocs.org/sdr/UIEA2024050800343), May 7, 2024: SKIN. DEBONDED. DISBOND - FILLER, AFT OTBD SIDE OF LH WING INBD AILERON WBL 515(<P>1) PERFORM REPAIR OF DISBOND SKIN DAMAGE AT LH WING INBD AILERON T/E OUTBD SIDE LWR SURFACE. 
- [SDR UIEA2024050800344](https://openairdocs.org/sdr/UIEA2024050800344), May 7, 2024: REVEAL. CRACKED. LH 5 DOOR FWD CUTOUT, DOOR RELEASE HANDLE AREA REVEAL PANEL CRACK. STA 2240 WL 250(<P>1) REPAIR DAMAGE AREA IAW W/S 40322 (SRM 53-60-15-2R-7 REV 100). 2) JOB CO
- [SDR UIEA2024050800345](https://openairdocs.org/sdr/UIEA2024050800345), May 7, 2024: BATTERY PACK. NO TEST. WHEN PERFORM EMERGENCY LIGHT BATTERY PACK CAPACITY TEST, FOUND BATTERY M5168 OUT OF LIMIT(<P>1) IAW AMM 33-51-04-902-001-001 REV 110 R/R EMERGENCY LIGHT BATTERY
- [SDR UIEA2024050800346](https://openairdocs.org/sdr/UIEA2024050800346), May 7, 2024: BATTERY. EXPIRED. FOUND MDC FIXED ELT BATTERY EXPIRED DATE DUE AT DEC 2021(<P>1) IAW AMM 23-24-01-002-001 &AMP; 23-24-01-402-004 REV 110 R/R ELT B00779. 2) IAW AMM 23-24-00-730-8
- [SDR UIEA2024050800347](https://openairdocs.org/sdr/UIEA2024050800347), May 7, 2024: CHARGER. FAILED. FOUND EMERGENCY LIGHT BATTERY M5169 CAPACITY TEST OUT OF LIMIT(<P>1) IAW AMM 33-51-04-002-009-001 &AMP; 33-51-04-402-012-001 REV 110 R/R EMERGENCY LIGHT BATTERY
- [SDR UIEA2024022700134](https://openairdocs.org/sdr/UIEA2024022700134), Feb 27, 2024: BRACKET. BENT. DURING CLIMB, EICAS MESSAGE GEAR DOOR DISPLAYED WHEN MOVING GEAR HANDLE FROM UP TO OFF. RETURNED HANDLE TO UP, EICAS MESSAGE CLEARED. DIVERTED TO LAX.(<P>PERFO
- [SDR UIEA2023111100938](https://openairdocs.org/sdr/UIEA2023111100938), Nov 11, 2023: ACTUATOR. UNKNOWN. ENG 2 ROLL BACK AFTER LANDING(<P>REMOVED AND REPLACED RH AND LH VSV ACTUATOR REF AMM 75-31-02. OPS CHK GOOD.</P>)
- [SDR UIEA2023110200934](https://openairdocs.org/sdr/UIEA2023110200934), Nov 1, 2023: AOA. UNKNOWN. PITCH LIMITING INDICATOR DISPLAYED WHEN FLAPS WERE RETRACTED DURING CRUISE(<P>REPLACED LH AOA SENSOR IAW B747 AMM 34-12-03. NO FURTHER DEFECTS NOTED.</P>)
- [SDR UIEA2023100700891](https://openairdocs.org/sdr/UIEA2023100700891), Oct 5, 2023: WIRE HARNESS. UNKNOWN. ENG 3 FIRE LOOP A & B FAILED(<P>R/R UPPER &AMP; LWR AFT DETECTOR ASSY IAW AMM 26-11-02. R/R HARNESS 61B45322 IAW AMM 26-11-02. R/R HARNESS WIRE AND ENG IDLE TES
- [SDR UIEA2023090400826](https://openairdocs.org/sdr/UIEA2023090400826), Sep 4, 2023: CONTROLLER. FAULTED. CABIN ALT AUTO FAILED JUST AFTER TAKEOFF. EICAS MSGS: "CABIN ALT AUTO" & "OUTFLOW VLV L" DISPLAYED. RT OUTFLOW VALVE PREVIOUSLY DEFERRED.(<P>REMOVED AND REPLACE
- [SDR UIEA2023062000652](https://openairdocs.org/sdr/UIEA2023062000652), Jun 21, 2023: UNKNOWN. UNKNOWN. BULK CARGO - STA 2160 PARTITION LINER FOUND TORN(<P>REPAIRED CARRIED OUT AS PER RI-25-54-16324 REV A. NO FURTHER DEFECTS NOTED. PN 453U1553-14</P>)

All 154: https://openairdocs.org/model/boeing-747-4kzf/reports.md

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